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![Michael Haggerty](/assets/img/avatar_default.png)
The extra_refs provided a kludgy way to create fake references at a global level in the hope that they would only affect some particular code path. The last user of this API been rewritten, so strip this stuff out before somebody else gets the bad idea of using it. Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2130 lines
52 KiB
C
2130 lines
52 KiB
C
#include "cache.h"
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#include "refs.h"
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#include "object.h"
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#include "tag.h"
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#include "dir.h"
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/* ISSYMREF=0x01, ISPACKED=0x02 and ISBROKEN=0x04 are public interfaces */
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#define REF_KNOWS_PEELED 0x10
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struct ref_entry {
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unsigned char flag; /* ISSYMREF? ISPACKED? */
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unsigned char sha1[20];
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unsigned char peeled[20];
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/* The full name of the reference (e.g., "refs/heads/master"): */
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char name[FLEX_ARRAY];
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};
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struct ref_array {
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int nr, alloc;
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/*
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* Entries with index 0 <= i < sorted are sorted by name. New
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* entries are appended to the list unsorted, and are sorted
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* only when required; thus we avoid the need to sort the list
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* after the addition of every reference.
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*/
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int sorted;
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struct ref_entry **refs;
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};
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/*
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* Parse one line from a packed-refs file. Write the SHA1 to sha1.
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* Return a pointer to the refname within the line (null-terminated),
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* or NULL if there was a problem.
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*/
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static const char *parse_ref_line(char *line, unsigned char *sha1)
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{
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/*
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* 42: the answer to everything.
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*
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* In this case, it happens to be the answer to
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* 40 (length of sha1 hex representation)
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* +1 (space in between hex and name)
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* +1 (newline at the end of the line)
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*/
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int len = strlen(line) - 42;
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if (len <= 0)
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return NULL;
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if (get_sha1_hex(line, sha1) < 0)
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return NULL;
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if (!isspace(line[40]))
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return NULL;
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line += 41;
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if (isspace(*line))
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return NULL;
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if (line[len] != '\n')
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return NULL;
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line[len] = 0;
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return line;
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}
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static struct ref_entry *create_ref_entry(const char *refname,
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const unsigned char *sha1, int flag,
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int check_name)
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{
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int len;
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struct ref_entry *ref;
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if (check_name &&
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check_refname_format(refname, REFNAME_ALLOW_ONELEVEL|REFNAME_DOT_COMPONENT))
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die("Reference has invalid format: '%s'", refname);
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len = strlen(refname) + 1;
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ref = xmalloc(sizeof(struct ref_entry) + len);
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hashcpy(ref->sha1, sha1);
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hashclr(ref->peeled);
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memcpy(ref->name, refname, len);
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ref->flag = flag;
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return ref;
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}
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/* Add a ref_entry to the end of the ref_array (unsorted). */
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static void add_ref(struct ref_array *refs, struct ref_entry *ref)
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{
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ALLOC_GROW(refs->refs, refs->nr + 1, refs->alloc);
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refs->refs[refs->nr++] = ref;
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}
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static int ref_entry_cmp(const void *a, const void *b)
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{
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struct ref_entry *one = *(struct ref_entry **)a;
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struct ref_entry *two = *(struct ref_entry **)b;
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return strcmp(one->name, two->name);
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}
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/*
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* Emit a warning and return true iff ref1 and ref2 have the same name
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* and the same sha1. Die if they have the same name but different
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* sha1s.
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*/
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static int is_dup_ref(const struct ref_entry *ref1, const struct ref_entry *ref2)
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{
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if (!strcmp(ref1->name, ref2->name)) {
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/* Duplicate name; make sure that the SHA1s match: */
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if (hashcmp(ref1->sha1, ref2->sha1))
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die("Duplicated ref, and SHA1s don't match: %s",
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ref1->name);
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warning("Duplicated ref: %s", ref1->name);
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return 1;
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} else {
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return 0;
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}
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}
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/*
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* Sort the entries in array (if they are not already sorted).
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*/
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static void sort_ref_array(struct ref_array *array)
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{
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int i, j;
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/*
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* This check also prevents passing a zero-length array to qsort(),
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* which is a problem on some platforms.
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*/
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if (array->sorted == array->nr)
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return;
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qsort(array->refs, array->nr, sizeof(*array->refs), ref_entry_cmp);
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/* Remove any duplicates from the ref_array */
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i = 0;
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for (j = 1; j < array->nr; j++) {
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if (is_dup_ref(array->refs[i], array->refs[j])) {
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free(array->refs[j]);
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continue;
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}
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array->refs[++i] = array->refs[j];
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}
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array->sorted = array->nr = i + 1;
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}
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static struct ref_entry *search_ref_array(struct ref_array *array, const char *refname)
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{
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struct ref_entry *e, **r;
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int len;
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if (refname == NULL)
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return NULL;
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if (!array->nr)
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return NULL;
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sort_ref_array(array);
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len = strlen(refname) + 1;
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e = xmalloc(sizeof(struct ref_entry) + len);
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memcpy(e->name, refname, len);
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r = bsearch(&e, array->refs, array->nr, sizeof(*array->refs), ref_entry_cmp);
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free(e);
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if (r == NULL)
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return NULL;
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return *r;
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}
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/*
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* Future: need to be in "struct repository"
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* when doing a full libification.
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*/
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static struct ref_cache {
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struct ref_cache *next;
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char did_loose;
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char did_packed;
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struct ref_array loose;
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struct ref_array packed;
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/* The submodule name, or "" for the main repo. */
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char name[FLEX_ARRAY];
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} *ref_cache;
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static struct ref_entry *current_ref;
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static void clear_ref_array(struct ref_array *array)
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{
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int i;
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for (i = 0; i < array->nr; i++)
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free(array->refs[i]);
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free(array->refs);
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array->sorted = array->nr = array->alloc = 0;
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array->refs = NULL;
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}
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static void clear_packed_ref_cache(struct ref_cache *refs)
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{
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if (refs->did_packed)
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clear_ref_array(&refs->packed);
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refs->did_packed = 0;
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}
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static void clear_loose_ref_cache(struct ref_cache *refs)
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{
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if (refs->did_loose)
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clear_ref_array(&refs->loose);
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refs->did_loose = 0;
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}
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static struct ref_cache *create_ref_cache(const char *submodule)
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{
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int len;
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struct ref_cache *refs;
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if (!submodule)
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submodule = "";
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len = strlen(submodule) + 1;
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refs = xcalloc(1, sizeof(struct ref_cache) + len);
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memcpy(refs->name, submodule, len);
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return refs;
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}
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/*
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* Return a pointer to a ref_cache for the specified submodule. For
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* the main repository, use submodule==NULL. The returned structure
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* will be allocated and initialized but not necessarily populated; it
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* should not be freed.
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*/
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static struct ref_cache *get_ref_cache(const char *submodule)
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{
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struct ref_cache *refs = ref_cache;
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if (!submodule)
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submodule = "";
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while (refs) {
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if (!strcmp(submodule, refs->name))
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return refs;
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refs = refs->next;
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}
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refs = create_ref_cache(submodule);
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refs->next = ref_cache;
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ref_cache = refs;
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return refs;
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}
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void invalidate_ref_cache(const char *submodule)
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{
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struct ref_cache *refs = get_ref_cache(submodule);
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clear_packed_ref_cache(refs);
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clear_loose_ref_cache(refs);
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}
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static void read_packed_refs(FILE *f, struct ref_array *array)
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{
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struct ref_entry *last = NULL;
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char refline[PATH_MAX];
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int flag = REF_ISPACKED;
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while (fgets(refline, sizeof(refline), f)) {
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unsigned char sha1[20];
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const char *refname;
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static const char header[] = "# pack-refs with:";
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if (!strncmp(refline, header, sizeof(header)-1)) {
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const char *traits = refline + sizeof(header) - 1;
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if (strstr(traits, " peeled "))
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flag |= REF_KNOWS_PEELED;
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/* perhaps other traits later as well */
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continue;
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}
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refname = parse_ref_line(refline, sha1);
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if (refname) {
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last = create_ref_entry(refname, sha1, flag, 1);
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add_ref(array, last);
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continue;
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}
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if (last &&
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refline[0] == '^' &&
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strlen(refline) == 42 &&
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refline[41] == '\n' &&
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!get_sha1_hex(refline + 1, sha1))
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hashcpy(last->peeled, sha1);
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}
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}
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static struct ref_array *get_packed_refs(struct ref_cache *refs)
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{
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if (!refs->did_packed) {
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const char *packed_refs_file;
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FILE *f;
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if (*refs->name)
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packed_refs_file = git_path_submodule(refs->name, "packed-refs");
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else
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packed_refs_file = git_path("packed-refs");
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f = fopen(packed_refs_file, "r");
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if (f) {
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read_packed_refs(f, &refs->packed);
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fclose(f);
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}
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refs->did_packed = 1;
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}
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return &refs->packed;
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}
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void add_packed_ref(const char *refname, const unsigned char *sha1)
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{
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add_ref(get_packed_refs(get_ref_cache(NULL)),
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create_ref_entry(refname, sha1, REF_ISPACKED, 1));
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}
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static void get_ref_dir(struct ref_cache *refs, const char *base,
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struct ref_array *array)
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{
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DIR *dir;
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const char *path;
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if (*refs->name)
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path = git_path_submodule(refs->name, "%s", base);
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else
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path = git_path("%s", base);
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dir = opendir(path);
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if (dir) {
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struct dirent *de;
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int baselen = strlen(base);
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char *refname = xmalloc(baselen + 257);
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memcpy(refname, base, baselen);
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if (baselen && base[baselen-1] != '/')
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refname[baselen++] = '/';
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while ((de = readdir(dir)) != NULL) {
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unsigned char sha1[20];
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struct stat st;
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int flag;
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int namelen;
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const char *refdir;
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if (de->d_name[0] == '.')
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continue;
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namelen = strlen(de->d_name);
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if (namelen > 255)
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continue;
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if (has_extension(de->d_name, ".lock"))
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continue;
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memcpy(refname + baselen, de->d_name, namelen+1);
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refdir = *refs->name
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? git_path_submodule(refs->name, "%s", refname)
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: git_path("%s", refname);
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if (stat(refdir, &st) < 0)
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continue;
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if (S_ISDIR(st.st_mode)) {
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get_ref_dir(refs, refname, array);
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continue;
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}
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if (*refs->name) {
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hashclr(sha1);
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flag = 0;
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if (resolve_gitlink_ref(refs->name, refname, sha1) < 0) {
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hashclr(sha1);
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flag |= REF_ISBROKEN;
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}
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} else if (read_ref_full(refname, sha1, 1, &flag)) {
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hashclr(sha1);
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flag |= REF_ISBROKEN;
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}
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add_ref(array, create_ref_entry(refname, sha1, flag, 1));
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}
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free(refname);
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closedir(dir);
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}
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}
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struct warn_if_dangling_data {
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FILE *fp;
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const char *refname;
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const char *msg_fmt;
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};
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static int warn_if_dangling_symref(const char *refname, const unsigned char *sha1,
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int flags, void *cb_data)
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{
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struct warn_if_dangling_data *d = cb_data;
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const char *resolves_to;
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unsigned char junk[20];
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if (!(flags & REF_ISSYMREF))
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return 0;
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resolves_to = resolve_ref_unsafe(refname, junk, 0, NULL);
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if (!resolves_to || strcmp(resolves_to, d->refname))
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return 0;
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fprintf(d->fp, d->msg_fmt, refname);
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return 0;
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}
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void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname)
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{
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struct warn_if_dangling_data data;
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data.fp = fp;
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data.refname = refname;
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data.msg_fmt = msg_fmt;
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for_each_rawref(warn_if_dangling_symref, &data);
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}
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static struct ref_array *get_loose_refs(struct ref_cache *refs)
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{
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if (!refs->did_loose) {
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get_ref_dir(refs, "refs", &refs->loose);
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refs->did_loose = 1;
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}
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return &refs->loose;
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}
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/* We allow "recursive" symbolic refs. Only within reason, though */
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#define MAXDEPTH 5
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#define MAXREFLEN (1024)
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/*
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* Called by resolve_gitlink_ref_recursive() after it failed to read
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* from the loose refs in ref_cache refs. Find <refname> in the
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* packed-refs file for the submodule.
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*/
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static int resolve_gitlink_packed_ref(struct ref_cache *refs,
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const char *refname, unsigned char *sha1)
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{
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struct ref_entry *ref;
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struct ref_array *array = get_packed_refs(refs);
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ref = search_ref_array(array, refname);
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if (ref == NULL)
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return -1;
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memcpy(sha1, ref->sha1, 20);
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return 0;
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}
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static int resolve_gitlink_ref_recursive(struct ref_cache *refs,
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const char *refname, unsigned char *sha1,
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int recursion)
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{
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int fd, len;
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char buffer[128], *p;
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char *path;
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if (recursion > MAXDEPTH || strlen(refname) > MAXREFLEN)
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return -1;
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path = *refs->name
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? git_path_submodule(refs->name, "%s", refname)
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: git_path("%s", refname);
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fd = open(path, O_RDONLY);
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if (fd < 0)
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return resolve_gitlink_packed_ref(refs, refname, sha1);
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len = read(fd, buffer, sizeof(buffer)-1);
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close(fd);
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if (len < 0)
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return -1;
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while (len && isspace(buffer[len-1]))
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len--;
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buffer[len] = 0;
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/* Was it a detached head or an old-fashioned symlink? */
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if (!get_sha1_hex(buffer, sha1))
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return 0;
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/* Symref? */
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if (strncmp(buffer, "ref:", 4))
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return -1;
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p = buffer + 4;
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while (isspace(*p))
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p++;
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return resolve_gitlink_ref_recursive(refs, p, sha1, recursion+1);
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}
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int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *sha1)
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{
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int len = strlen(path), retval;
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char *submodule;
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struct ref_cache *refs;
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while (len && path[len-1] == '/')
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len--;
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if (!len)
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return -1;
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submodule = xstrndup(path, len);
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refs = get_ref_cache(submodule);
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free(submodule);
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retval = resolve_gitlink_ref_recursive(refs, refname, sha1, 0);
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return retval;
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}
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/*
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* Try to read ref from the packed references. On success, set sha1
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* and return 0; otherwise, return -1.
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*/
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static int get_packed_ref(const char *refname, unsigned char *sha1)
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{
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struct ref_array *packed = get_packed_refs(get_ref_cache(NULL));
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struct ref_entry *entry = search_ref_array(packed, refname);
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if (entry) {
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hashcpy(sha1, entry->sha1);
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return 0;
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}
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return -1;
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}
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const char *resolve_ref_unsafe(const char *refname, unsigned char *sha1, int reading, int *flag)
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{
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int depth = MAXDEPTH;
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ssize_t len;
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char buffer[256];
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static char refname_buffer[256];
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if (flag)
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*flag = 0;
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if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL))
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return NULL;
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for (;;) {
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char path[PATH_MAX];
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struct stat st;
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char *buf;
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int fd;
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if (--depth < 0)
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return NULL;
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|
git_snpath(path, sizeof(path), "%s", refname);
|
|
|
|
if (lstat(path, &st) < 0) {
|
|
if (errno != ENOENT)
|
|
return NULL;
|
|
/*
|
|
* The loose reference file does not exist;
|
|
* check for a packed reference.
|
|
*/
|
|
if (!get_packed_ref(refname, sha1)) {
|
|
if (flag)
|
|
*flag |= REF_ISPACKED;
|
|
return refname;
|
|
}
|
|
/* The reference is not a packed reference, either. */
|
|
if (reading) {
|
|
return NULL;
|
|
} else {
|
|
hashclr(sha1);
|
|
return refname;
|
|
}
|
|
}
|
|
|
|
/* Follow "normalized" - ie "refs/.." symlinks by hand */
|
|
if (S_ISLNK(st.st_mode)) {
|
|
len = readlink(path, buffer, sizeof(buffer)-1);
|
|
if (len < 0)
|
|
return NULL;
|
|
buffer[len] = 0;
|
|
if (!prefixcmp(buffer, "refs/") &&
|
|
!check_refname_format(buffer, 0)) {
|
|
strcpy(refname_buffer, buffer);
|
|
refname = refname_buffer;
|
|
if (flag)
|
|
*flag |= REF_ISSYMREF;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
/* Is it a directory? */
|
|
if (S_ISDIR(st.st_mode)) {
|
|
errno = EISDIR;
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Anything else, just open it and try to use it as
|
|
* a ref
|
|
*/
|
|
fd = open(path, O_RDONLY);
|
|
if (fd < 0)
|
|
return NULL;
|
|
len = read_in_full(fd, buffer, sizeof(buffer)-1);
|
|
close(fd);
|
|
if (len < 0)
|
|
return NULL;
|
|
while (len && isspace(buffer[len-1]))
|
|
len--;
|
|
buffer[len] = '\0';
|
|
|
|
/*
|
|
* Is it a symbolic ref?
|
|
*/
|
|
if (prefixcmp(buffer, "ref:"))
|
|
break;
|
|
if (flag)
|
|
*flag |= REF_ISSYMREF;
|
|
buf = buffer + 4;
|
|
while (isspace(*buf))
|
|
buf++;
|
|
if (check_refname_format(buf, REFNAME_ALLOW_ONELEVEL)) {
|
|
if (flag)
|
|
*flag |= REF_ISBROKEN;
|
|
return NULL;
|
|
}
|
|
refname = strcpy(refname_buffer, buf);
|
|
}
|
|
/* Please note that FETCH_HEAD has a second line containing other data. */
|
|
if (get_sha1_hex(buffer, sha1) || (buffer[40] != '\0' && !isspace(buffer[40]))) {
|
|
if (flag)
|
|
*flag |= REF_ISBROKEN;
|
|
return NULL;
|
|
}
|
|
return refname;
|
|
}
|
|
|
|
char *resolve_refdup(const char *ref, unsigned char *sha1, int reading, int *flag)
|
|
{
|
|
const char *ret = resolve_ref_unsafe(ref, sha1, reading, flag);
|
|
return ret ? xstrdup(ret) : NULL;
|
|
}
|
|
|
|
/* The argument to filter_refs */
|
|
struct ref_filter {
|
|
const char *pattern;
|
|
each_ref_fn *fn;
|
|
void *cb_data;
|
|
};
|
|
|
|
int read_ref_full(const char *refname, unsigned char *sha1, int reading, int *flags)
|
|
{
|
|
if (resolve_ref_unsafe(refname, sha1, reading, flags))
|
|
return 0;
|
|
return -1;
|
|
}
|
|
|
|
int read_ref(const char *refname, unsigned char *sha1)
|
|
{
|
|
return read_ref_full(refname, sha1, 1, NULL);
|
|
}
|
|
|
|
#define DO_FOR_EACH_INCLUDE_BROKEN 01
|
|
static int do_one_ref(const char *base, each_ref_fn fn, int trim,
|
|
int flags, void *cb_data, struct ref_entry *entry)
|
|
{
|
|
if (prefixcmp(entry->name, base))
|
|
return 0;
|
|
|
|
if (!(flags & DO_FOR_EACH_INCLUDE_BROKEN)) {
|
|
if (entry->flag & REF_ISBROKEN)
|
|
return 0; /* ignore broken refs e.g. dangling symref */
|
|
if (!has_sha1_file(entry->sha1)) {
|
|
error("%s does not point to a valid object!", entry->name);
|
|
return 0;
|
|
}
|
|
}
|
|
current_ref = entry;
|
|
return fn(entry->name + trim, entry->sha1, entry->flag, cb_data);
|
|
}
|
|
|
|
static int filter_refs(const char *refname, const unsigned char *sha1, int flags,
|
|
void *data)
|
|
{
|
|
struct ref_filter *filter = (struct ref_filter *)data;
|
|
if (fnmatch(filter->pattern, refname, 0))
|
|
return 0;
|
|
return filter->fn(refname, sha1, flags, filter->cb_data);
|
|
}
|
|
|
|
int peel_ref(const char *refname, unsigned char *sha1)
|
|
{
|
|
int flag;
|
|
unsigned char base[20];
|
|
struct object *o;
|
|
|
|
if (current_ref && (current_ref->name == refname
|
|
|| !strcmp(current_ref->name, refname))) {
|
|
if (current_ref->flag & REF_KNOWS_PEELED) {
|
|
hashcpy(sha1, current_ref->peeled);
|
|
return 0;
|
|
}
|
|
hashcpy(base, current_ref->sha1);
|
|
goto fallback;
|
|
}
|
|
|
|
if (read_ref_full(refname, base, 1, &flag))
|
|
return -1;
|
|
|
|
if ((flag & REF_ISPACKED)) {
|
|
struct ref_array *array = get_packed_refs(get_ref_cache(NULL));
|
|
struct ref_entry *r = search_ref_array(array, refname);
|
|
|
|
if (r != NULL && r->flag & REF_KNOWS_PEELED) {
|
|
hashcpy(sha1, r->peeled);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
fallback:
|
|
o = parse_object(base);
|
|
if (o && o->type == OBJ_TAG) {
|
|
o = deref_tag(o, refname, 0);
|
|
if (o) {
|
|
hashcpy(sha1, o->sha1);
|
|
return 0;
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
static int do_for_each_ref(const char *submodule, const char *base, each_ref_fn fn,
|
|
int trim, int flags, void *cb_data)
|
|
{
|
|
int retval = 0, p = 0, l = 0;
|
|
struct ref_cache *refs = get_ref_cache(submodule);
|
|
struct ref_array *packed = get_packed_refs(refs);
|
|
struct ref_array *loose = get_loose_refs(refs);
|
|
|
|
sort_ref_array(packed);
|
|
sort_ref_array(loose);
|
|
while (p < packed->nr && l < loose->nr) {
|
|
struct ref_entry *entry;
|
|
int cmp = strcmp(packed->refs[p]->name, loose->refs[l]->name);
|
|
if (!cmp) {
|
|
p++;
|
|
continue;
|
|
}
|
|
if (cmp > 0) {
|
|
entry = loose->refs[l++];
|
|
} else {
|
|
entry = packed->refs[p++];
|
|
}
|
|
retval = do_one_ref(base, fn, trim, flags, cb_data, entry);
|
|
if (retval)
|
|
goto end_each;
|
|
}
|
|
|
|
if (l < loose->nr) {
|
|
p = l;
|
|
packed = loose;
|
|
}
|
|
|
|
for (; p < packed->nr; p++) {
|
|
retval = do_one_ref(base, fn, trim, flags, cb_data, packed->refs[p]);
|
|
if (retval)
|
|
goto end_each;
|
|
}
|
|
|
|
end_each:
|
|
current_ref = NULL;
|
|
return retval;
|
|
}
|
|
|
|
|
|
static int do_head_ref(const char *submodule, each_ref_fn fn, void *cb_data)
|
|
{
|
|
unsigned char sha1[20];
|
|
int flag;
|
|
|
|
if (submodule) {
|
|
if (resolve_gitlink_ref(submodule, "HEAD", sha1) == 0)
|
|
return fn("HEAD", sha1, 0, cb_data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
if (!read_ref_full("HEAD", sha1, 1, &flag))
|
|
return fn("HEAD", sha1, flag, cb_data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int head_ref(each_ref_fn fn, void *cb_data)
|
|
{
|
|
return do_head_ref(NULL, fn, cb_data);
|
|
}
|
|
|
|
int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
|
|
{
|
|
return do_head_ref(submodule, fn, cb_data);
|
|
}
|
|
|
|
int for_each_ref(each_ref_fn fn, void *cb_data)
|
|
{
|
|
return do_for_each_ref(NULL, "", fn, 0, 0, cb_data);
|
|
}
|
|
|
|
int for_each_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
|
|
{
|
|
return do_for_each_ref(submodule, "", fn, 0, 0, cb_data);
|
|
}
|
|
|
|
int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data)
|
|
{
|
|
return do_for_each_ref(NULL, prefix, fn, strlen(prefix), 0, cb_data);
|
|
}
|
|
|
|
int for_each_ref_in_submodule(const char *submodule, const char *prefix,
|
|
each_ref_fn fn, void *cb_data)
|
|
{
|
|
return do_for_each_ref(submodule, prefix, fn, strlen(prefix), 0, cb_data);
|
|
}
|
|
|
|
int for_each_tag_ref(each_ref_fn fn, void *cb_data)
|
|
{
|
|
return for_each_ref_in("refs/tags/", fn, cb_data);
|
|
}
|
|
|
|
int for_each_tag_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
|
|
{
|
|
return for_each_ref_in_submodule(submodule, "refs/tags/", fn, cb_data);
|
|
}
|
|
|
|
int for_each_branch_ref(each_ref_fn fn, void *cb_data)
|
|
{
|
|
return for_each_ref_in("refs/heads/", fn, cb_data);
|
|
}
|
|
|
|
int for_each_branch_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
|
|
{
|
|
return for_each_ref_in_submodule(submodule, "refs/heads/", fn, cb_data);
|
|
}
|
|
|
|
int for_each_remote_ref(each_ref_fn fn, void *cb_data)
|
|
{
|
|
return for_each_ref_in("refs/remotes/", fn, cb_data);
|
|
}
|
|
|
|
int for_each_remote_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
|
|
{
|
|
return for_each_ref_in_submodule(submodule, "refs/remotes/", fn, cb_data);
|
|
}
|
|
|
|
int for_each_replace_ref(each_ref_fn fn, void *cb_data)
|
|
{
|
|
return do_for_each_ref(NULL, "refs/replace/", fn, 13, 0, cb_data);
|
|
}
|
|
|
|
int head_ref_namespaced(each_ref_fn fn, void *cb_data)
|
|
{
|
|
struct strbuf buf = STRBUF_INIT;
|
|
int ret = 0;
|
|
unsigned char sha1[20];
|
|
int flag;
|
|
|
|
strbuf_addf(&buf, "%sHEAD", get_git_namespace());
|
|
if (!read_ref_full(buf.buf, sha1, 1, &flag))
|
|
ret = fn(buf.buf, sha1, flag, cb_data);
|
|
strbuf_release(&buf);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int for_each_namespaced_ref(each_ref_fn fn, void *cb_data)
|
|
{
|
|
struct strbuf buf = STRBUF_INIT;
|
|
int ret;
|
|
strbuf_addf(&buf, "%srefs/", get_git_namespace());
|
|
ret = do_for_each_ref(NULL, buf.buf, fn, 0, 0, cb_data);
|
|
strbuf_release(&buf);
|
|
return ret;
|
|
}
|
|
|
|
int for_each_glob_ref_in(each_ref_fn fn, const char *pattern,
|
|
const char *prefix, void *cb_data)
|
|
{
|
|
struct strbuf real_pattern = STRBUF_INIT;
|
|
struct ref_filter filter;
|
|
int ret;
|
|
|
|
if (!prefix && prefixcmp(pattern, "refs/"))
|
|
strbuf_addstr(&real_pattern, "refs/");
|
|
else if (prefix)
|
|
strbuf_addstr(&real_pattern, prefix);
|
|
strbuf_addstr(&real_pattern, pattern);
|
|
|
|
if (!has_glob_specials(pattern)) {
|
|
/* Append implied '/' '*' if not present. */
|
|
if (real_pattern.buf[real_pattern.len - 1] != '/')
|
|
strbuf_addch(&real_pattern, '/');
|
|
/* No need to check for '*', there is none. */
|
|
strbuf_addch(&real_pattern, '*');
|
|
}
|
|
|
|
filter.pattern = real_pattern.buf;
|
|
filter.fn = fn;
|
|
filter.cb_data = cb_data;
|
|
ret = for_each_ref(filter_refs, &filter);
|
|
|
|
strbuf_release(&real_pattern);
|
|
return ret;
|
|
}
|
|
|
|
int for_each_glob_ref(each_ref_fn fn, const char *pattern, void *cb_data)
|
|
{
|
|
return for_each_glob_ref_in(fn, pattern, NULL, cb_data);
|
|
}
|
|
|
|
int for_each_rawref(each_ref_fn fn, void *cb_data)
|
|
{
|
|
return do_for_each_ref(NULL, "", fn, 0,
|
|
DO_FOR_EACH_INCLUDE_BROKEN, cb_data);
|
|
}
|
|
|
|
/*
|
|
* Make sure "ref" is something reasonable to have under ".git/refs/";
|
|
* We do not like it if:
|
|
*
|
|
* - any path component of it begins with ".", or
|
|
* - it has double dots "..", or
|
|
* - it has ASCII control character, "~", "^", ":" or SP, anywhere, or
|
|
* - it ends with a "/".
|
|
* - it ends with ".lock"
|
|
* - it contains a "\" (backslash)
|
|
*/
|
|
|
|
/* Return true iff ch is not allowed in reference names. */
|
|
static inline int bad_ref_char(int ch)
|
|
{
|
|
if (((unsigned) ch) <= ' ' || ch == 0x7f ||
|
|
ch == '~' || ch == '^' || ch == ':' || ch == '\\')
|
|
return 1;
|
|
/* 2.13 Pattern Matching Notation */
|
|
if (ch == '*' || ch == '?' || ch == '[') /* Unsupported */
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Try to read one refname component from the front of refname. Return
|
|
* the length of the component found, or -1 if the component is not
|
|
* legal.
|
|
*/
|
|
static int check_refname_component(const char *refname, int flags)
|
|
{
|
|
const char *cp;
|
|
char last = '\0';
|
|
|
|
for (cp = refname; ; cp++) {
|
|
char ch = *cp;
|
|
if (ch == '\0' || ch == '/')
|
|
break;
|
|
if (bad_ref_char(ch))
|
|
return -1; /* Illegal character in refname. */
|
|
if (last == '.' && ch == '.')
|
|
return -1; /* Refname contains "..". */
|
|
if (last == '@' && ch == '{')
|
|
return -1; /* Refname contains "@{". */
|
|
last = ch;
|
|
}
|
|
if (cp == refname)
|
|
return -1; /* Component has zero length. */
|
|
if (refname[0] == '.') {
|
|
if (!(flags & REFNAME_DOT_COMPONENT))
|
|
return -1; /* Component starts with '.'. */
|
|
/*
|
|
* Even if leading dots are allowed, don't allow "."
|
|
* as a component (".." is prevented by a rule above).
|
|
*/
|
|
if (refname[1] == '\0')
|
|
return -1; /* Component equals ".". */
|
|
}
|
|
if (cp - refname >= 5 && !memcmp(cp - 5, ".lock", 5))
|
|
return -1; /* Refname ends with ".lock". */
|
|
return cp - refname;
|
|
}
|
|
|
|
int check_refname_format(const char *refname, int flags)
|
|
{
|
|
int component_len, component_count = 0;
|
|
|
|
while (1) {
|
|
/* We are at the start of a path component. */
|
|
component_len = check_refname_component(refname, flags);
|
|
if (component_len < 0) {
|
|
if ((flags & REFNAME_REFSPEC_PATTERN) &&
|
|
refname[0] == '*' &&
|
|
(refname[1] == '\0' || refname[1] == '/')) {
|
|
/* Accept one wildcard as a full refname component. */
|
|
flags &= ~REFNAME_REFSPEC_PATTERN;
|
|
component_len = 1;
|
|
} else {
|
|
return -1;
|
|
}
|
|
}
|
|
component_count++;
|
|
if (refname[component_len] == '\0')
|
|
break;
|
|
/* Skip to next component. */
|
|
refname += component_len + 1;
|
|
}
|
|
|
|
if (refname[component_len - 1] == '.')
|
|
return -1; /* Refname ends with '.'. */
|
|
if (!(flags & REFNAME_ALLOW_ONELEVEL) && component_count < 2)
|
|
return -1; /* Refname has only one component. */
|
|
return 0;
|
|
}
|
|
|
|
const char *prettify_refname(const char *name)
|
|
{
|
|
return name + (
|
|
!prefixcmp(name, "refs/heads/") ? 11 :
|
|
!prefixcmp(name, "refs/tags/") ? 10 :
|
|
!prefixcmp(name, "refs/remotes/") ? 13 :
|
|
0);
|
|
}
|
|
|
|
const char *ref_rev_parse_rules[] = {
|
|
"%.*s",
|
|
"refs/%.*s",
|
|
"refs/tags/%.*s",
|
|
"refs/heads/%.*s",
|
|
"refs/remotes/%.*s",
|
|
"refs/remotes/%.*s/HEAD",
|
|
NULL
|
|
};
|
|
|
|
int refname_match(const char *abbrev_name, const char *full_name, const char **rules)
|
|
{
|
|
const char **p;
|
|
const int abbrev_name_len = strlen(abbrev_name);
|
|
|
|
for (p = rules; *p; p++) {
|
|
if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name))) {
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct ref_lock *verify_lock(struct ref_lock *lock,
|
|
const unsigned char *old_sha1, int mustexist)
|
|
{
|
|
if (read_ref_full(lock->ref_name, lock->old_sha1, mustexist, NULL)) {
|
|
error("Can't verify ref %s", lock->ref_name);
|
|
unlock_ref(lock);
|
|
return NULL;
|
|
}
|
|
if (hashcmp(lock->old_sha1, old_sha1)) {
|
|
error("Ref %s is at %s but expected %s", lock->ref_name,
|
|
sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1));
|
|
unlock_ref(lock);
|
|
return NULL;
|
|
}
|
|
return lock;
|
|
}
|
|
|
|
static int remove_empty_directories(const char *file)
|
|
{
|
|
/* we want to create a file but there is a directory there;
|
|
* if that is an empty directory (or a directory that contains
|
|
* only empty directories), remove them.
|
|
*/
|
|
struct strbuf path;
|
|
int result;
|
|
|
|
strbuf_init(&path, 20);
|
|
strbuf_addstr(&path, file);
|
|
|
|
result = remove_dir_recursively(&path, REMOVE_DIR_EMPTY_ONLY);
|
|
|
|
strbuf_release(&path);
|
|
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Return true iff a reference named refname could be created without
|
|
* conflicting with the name of an existing reference. If oldrefname
|
|
* is non-NULL, ignore potential conflicts with oldrefname (e.g.,
|
|
* because oldrefname is scheduled for deletion in the same
|
|
* operation).
|
|
*/
|
|
static int is_refname_available(const char *refname, const char *oldrefname,
|
|
struct ref_array *array)
|
|
{
|
|
int i, namlen = strlen(refname); /* e.g. 'foo/bar' */
|
|
for (i = 0; i < array->nr; i++ ) {
|
|
struct ref_entry *entry = array->refs[i];
|
|
/* entry->name could be 'foo' or 'foo/bar/baz' */
|
|
if (!oldrefname || strcmp(oldrefname, entry->name)) {
|
|
int len = strlen(entry->name);
|
|
int cmplen = (namlen < len) ? namlen : len;
|
|
const char *lead = (namlen < len) ? entry->name : refname;
|
|
if (!strncmp(refname, entry->name, cmplen) &&
|
|
lead[cmplen] == '/') {
|
|
error("'%s' exists; cannot create '%s'",
|
|
entry->name, refname);
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* *string and *len will only be substituted, and *string returned (for
|
|
* later free()ing) if the string passed in is a magic short-hand form
|
|
* to name a branch.
|
|
*/
|
|
static char *substitute_branch_name(const char **string, int *len)
|
|
{
|
|
struct strbuf buf = STRBUF_INIT;
|
|
int ret = interpret_branch_name(*string, &buf);
|
|
|
|
if (ret == *len) {
|
|
size_t size;
|
|
*string = strbuf_detach(&buf, &size);
|
|
*len = size;
|
|
return (char *)*string;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref)
|
|
{
|
|
char *last_branch = substitute_branch_name(&str, &len);
|
|
const char **p, *r;
|
|
int refs_found = 0;
|
|
|
|
*ref = NULL;
|
|
for (p = ref_rev_parse_rules; *p; p++) {
|
|
char fullref[PATH_MAX];
|
|
unsigned char sha1_from_ref[20];
|
|
unsigned char *this_result;
|
|
int flag;
|
|
|
|
this_result = refs_found ? sha1_from_ref : sha1;
|
|
mksnpath(fullref, sizeof(fullref), *p, len, str);
|
|
r = resolve_ref_unsafe(fullref, this_result, 1, &flag);
|
|
if (r) {
|
|
if (!refs_found++)
|
|
*ref = xstrdup(r);
|
|
if (!warn_ambiguous_refs)
|
|
break;
|
|
} else if ((flag & REF_ISSYMREF) && strcmp(fullref, "HEAD")) {
|
|
warning("ignoring dangling symref %s.", fullref);
|
|
} else if ((flag & REF_ISBROKEN) && strchr(fullref, '/')) {
|
|
warning("ignoring broken ref %s.", fullref);
|
|
}
|
|
}
|
|
free(last_branch);
|
|
return refs_found;
|
|
}
|
|
|
|
int dwim_log(const char *str, int len, unsigned char *sha1, char **log)
|
|
{
|
|
char *last_branch = substitute_branch_name(&str, &len);
|
|
const char **p;
|
|
int logs_found = 0;
|
|
|
|
*log = NULL;
|
|
for (p = ref_rev_parse_rules; *p; p++) {
|
|
struct stat st;
|
|
unsigned char hash[20];
|
|
char path[PATH_MAX];
|
|
const char *ref, *it;
|
|
|
|
mksnpath(path, sizeof(path), *p, len, str);
|
|
ref = resolve_ref_unsafe(path, hash, 1, NULL);
|
|
if (!ref)
|
|
continue;
|
|
if (!stat(git_path("logs/%s", path), &st) &&
|
|
S_ISREG(st.st_mode))
|
|
it = path;
|
|
else if (strcmp(ref, path) &&
|
|
!stat(git_path("logs/%s", ref), &st) &&
|
|
S_ISREG(st.st_mode))
|
|
it = ref;
|
|
else
|
|
continue;
|
|
if (!logs_found++) {
|
|
*log = xstrdup(it);
|
|
hashcpy(sha1, hash);
|
|
}
|
|
if (!warn_ambiguous_refs)
|
|
break;
|
|
}
|
|
free(last_branch);
|
|
return logs_found;
|
|
}
|
|
|
|
static struct ref_lock *lock_ref_sha1_basic(const char *refname,
|
|
const unsigned char *old_sha1,
|
|
int flags, int *type_p)
|
|
{
|
|
char *ref_file;
|
|
const char *orig_refname = refname;
|
|
struct ref_lock *lock;
|
|
int last_errno = 0;
|
|
int type, lflags;
|
|
int mustexist = (old_sha1 && !is_null_sha1(old_sha1));
|
|
int missing = 0;
|
|
|
|
lock = xcalloc(1, sizeof(struct ref_lock));
|
|
lock->lock_fd = -1;
|
|
|
|
refname = resolve_ref_unsafe(refname, lock->old_sha1, mustexist, &type);
|
|
if (!refname && errno == EISDIR) {
|
|
/* we are trying to lock foo but we used to
|
|
* have foo/bar which now does not exist;
|
|
* it is normal for the empty directory 'foo'
|
|
* to remain.
|
|
*/
|
|
ref_file = git_path("%s", orig_refname);
|
|
if (remove_empty_directories(ref_file)) {
|
|
last_errno = errno;
|
|
error("there are still refs under '%s'", orig_refname);
|
|
goto error_return;
|
|
}
|
|
refname = resolve_ref_unsafe(orig_refname, lock->old_sha1, mustexist, &type);
|
|
}
|
|
if (type_p)
|
|
*type_p = type;
|
|
if (!refname) {
|
|
last_errno = errno;
|
|
error("unable to resolve reference %s: %s",
|
|
orig_refname, strerror(errno));
|
|
goto error_return;
|
|
}
|
|
missing = is_null_sha1(lock->old_sha1);
|
|
/* When the ref did not exist and we are creating it,
|
|
* make sure there is no existing ref that is packed
|
|
* whose name begins with our refname, nor a ref whose
|
|
* name is a proper prefix of our refname.
|
|
*/
|
|
if (missing &&
|
|
!is_refname_available(refname, NULL, get_packed_refs(get_ref_cache(NULL)))) {
|
|
last_errno = ENOTDIR;
|
|
goto error_return;
|
|
}
|
|
|
|
lock->lk = xcalloc(1, sizeof(struct lock_file));
|
|
|
|
lflags = LOCK_DIE_ON_ERROR;
|
|
if (flags & REF_NODEREF) {
|
|
refname = orig_refname;
|
|
lflags |= LOCK_NODEREF;
|
|
}
|
|
lock->ref_name = xstrdup(refname);
|
|
lock->orig_ref_name = xstrdup(orig_refname);
|
|
ref_file = git_path("%s", refname);
|
|
if (missing)
|
|
lock->force_write = 1;
|
|
if ((flags & REF_NODEREF) && (type & REF_ISSYMREF))
|
|
lock->force_write = 1;
|
|
|
|
if (safe_create_leading_directories(ref_file)) {
|
|
last_errno = errno;
|
|
error("unable to create directory for %s", ref_file);
|
|
goto error_return;
|
|
}
|
|
|
|
lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, lflags);
|
|
return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock;
|
|
|
|
error_return:
|
|
unlock_ref(lock);
|
|
errno = last_errno;
|
|
return NULL;
|
|
}
|
|
|
|
struct ref_lock *lock_ref_sha1(const char *refname, const unsigned char *old_sha1)
|
|
{
|
|
char refpath[PATH_MAX];
|
|
if (check_refname_format(refname, 0))
|
|
return NULL;
|
|
strcpy(refpath, mkpath("refs/%s", refname));
|
|
return lock_ref_sha1_basic(refpath, old_sha1, 0, NULL);
|
|
}
|
|
|
|
struct ref_lock *lock_any_ref_for_update(const char *refname,
|
|
const unsigned char *old_sha1, int flags)
|
|
{
|
|
if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL))
|
|
return NULL;
|
|
return lock_ref_sha1_basic(refname, old_sha1, flags, NULL);
|
|
}
|
|
|
|
static struct lock_file packlock;
|
|
|
|
static int repack_without_ref(const char *refname)
|
|
{
|
|
struct ref_array *packed;
|
|
int fd, i;
|
|
|
|
packed = get_packed_refs(get_ref_cache(NULL));
|
|
if (search_ref_array(packed, refname) == NULL)
|
|
return 0;
|
|
fd = hold_lock_file_for_update(&packlock, git_path("packed-refs"), 0);
|
|
if (fd < 0) {
|
|
unable_to_lock_error(git_path("packed-refs"), errno);
|
|
return error("cannot delete '%s' from packed refs", refname);
|
|
}
|
|
|
|
for (i = 0; i < packed->nr; i++) {
|
|
char line[PATH_MAX + 100];
|
|
int len;
|
|
struct ref_entry *ref = packed->refs[i];
|
|
|
|
if (!strcmp(refname, ref->name))
|
|
continue;
|
|
len = snprintf(line, sizeof(line), "%s %s\n",
|
|
sha1_to_hex(ref->sha1), ref->name);
|
|
/* this should not happen but just being defensive */
|
|
if (len > sizeof(line))
|
|
die("too long a refname '%s'", ref->name);
|
|
write_or_die(fd, line, len);
|
|
}
|
|
return commit_lock_file(&packlock);
|
|
}
|
|
|
|
int delete_ref(const char *refname, const unsigned char *sha1, int delopt)
|
|
{
|
|
struct ref_lock *lock;
|
|
int err, i = 0, ret = 0, flag = 0;
|
|
|
|
lock = lock_ref_sha1_basic(refname, sha1, 0, &flag);
|
|
if (!lock)
|
|
return 1;
|
|
if (!(flag & REF_ISPACKED) || flag & REF_ISSYMREF) {
|
|
/* loose */
|
|
const char *path;
|
|
|
|
if (!(delopt & REF_NODEREF)) {
|
|
i = strlen(lock->lk->filename) - 5; /* .lock */
|
|
lock->lk->filename[i] = 0;
|
|
path = lock->lk->filename;
|
|
} else {
|
|
path = git_path("%s", refname);
|
|
}
|
|
err = unlink_or_warn(path);
|
|
if (err && errno != ENOENT)
|
|
ret = 1;
|
|
|
|
if (!(delopt & REF_NODEREF))
|
|
lock->lk->filename[i] = '.';
|
|
}
|
|
/* removing the loose one could have resurrected an earlier
|
|
* packed one. Also, if it was not loose we need to repack
|
|
* without it.
|
|
*/
|
|
ret |= repack_without_ref(refname);
|
|
|
|
unlink_or_warn(git_path("logs/%s", lock->ref_name));
|
|
invalidate_ref_cache(NULL);
|
|
unlock_ref(lock);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* People using contrib's git-new-workdir have .git/logs/refs ->
|
|
* /some/other/path/.git/logs/refs, and that may live on another device.
|
|
*
|
|
* IOW, to avoid cross device rename errors, the temporary renamed log must
|
|
* live into logs/refs.
|
|
*/
|
|
#define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log"
|
|
|
|
int rename_ref(const char *oldrefname, const char *newrefname, const char *logmsg)
|
|
{
|
|
unsigned char sha1[20], orig_sha1[20];
|
|
int flag = 0, logmoved = 0;
|
|
struct ref_lock *lock;
|
|
struct stat loginfo;
|
|
int log = !lstat(git_path("logs/%s", oldrefname), &loginfo);
|
|
const char *symref = NULL;
|
|
struct ref_cache *refs = get_ref_cache(NULL);
|
|
|
|
if (log && S_ISLNK(loginfo.st_mode))
|
|
return error("reflog for %s is a symlink", oldrefname);
|
|
|
|
symref = resolve_ref_unsafe(oldrefname, orig_sha1, 1, &flag);
|
|
if (flag & REF_ISSYMREF)
|
|
return error("refname %s is a symbolic ref, renaming it is not supported",
|
|
oldrefname);
|
|
if (!symref)
|
|
return error("refname %s not found", oldrefname);
|
|
|
|
if (!is_refname_available(newrefname, oldrefname, get_packed_refs(refs)))
|
|
return 1;
|
|
|
|
if (!is_refname_available(newrefname, oldrefname, get_loose_refs(refs)))
|
|
return 1;
|
|
|
|
if (log && rename(git_path("logs/%s", oldrefname), git_path(TMP_RENAMED_LOG)))
|
|
return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG": %s",
|
|
oldrefname, strerror(errno));
|
|
|
|
if (delete_ref(oldrefname, orig_sha1, REF_NODEREF)) {
|
|
error("unable to delete old %s", oldrefname);
|
|
goto rollback;
|
|
}
|
|
|
|
if (!read_ref_full(newrefname, sha1, 1, &flag) &&
|
|
delete_ref(newrefname, sha1, REF_NODEREF)) {
|
|
if (errno==EISDIR) {
|
|
if (remove_empty_directories(git_path("%s", newrefname))) {
|
|
error("Directory not empty: %s", newrefname);
|
|
goto rollback;
|
|
}
|
|
} else {
|
|
error("unable to delete existing %s", newrefname);
|
|
goto rollback;
|
|
}
|
|
}
|
|
|
|
if (log && safe_create_leading_directories(git_path("logs/%s", newrefname))) {
|
|
error("unable to create directory for %s", newrefname);
|
|
goto rollback;
|
|
}
|
|
|
|
retry:
|
|
if (log && rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", newrefname))) {
|
|
if (errno==EISDIR || errno==ENOTDIR) {
|
|
/*
|
|
* rename(a, b) when b is an existing
|
|
* directory ought to result in ISDIR, but
|
|
* Solaris 5.8 gives ENOTDIR. Sheesh.
|
|
*/
|
|
if (remove_empty_directories(git_path("logs/%s", newrefname))) {
|
|
error("Directory not empty: logs/%s", newrefname);
|
|
goto rollback;
|
|
}
|
|
goto retry;
|
|
} else {
|
|
error("unable to move logfile "TMP_RENAMED_LOG" to logs/%s: %s",
|
|
newrefname, strerror(errno));
|
|
goto rollback;
|
|
}
|
|
}
|
|
logmoved = log;
|
|
|
|
lock = lock_ref_sha1_basic(newrefname, NULL, 0, NULL);
|
|
if (!lock) {
|
|
error("unable to lock %s for update", newrefname);
|
|
goto rollback;
|
|
}
|
|
lock->force_write = 1;
|
|
hashcpy(lock->old_sha1, orig_sha1);
|
|
if (write_ref_sha1(lock, orig_sha1, logmsg)) {
|
|
error("unable to write current sha1 into %s", newrefname);
|
|
goto rollback;
|
|
}
|
|
|
|
return 0;
|
|
|
|
rollback:
|
|
lock = lock_ref_sha1_basic(oldrefname, NULL, 0, NULL);
|
|
if (!lock) {
|
|
error("unable to lock %s for rollback", oldrefname);
|
|
goto rollbacklog;
|
|
}
|
|
|
|
lock->force_write = 1;
|
|
flag = log_all_ref_updates;
|
|
log_all_ref_updates = 0;
|
|
if (write_ref_sha1(lock, orig_sha1, NULL))
|
|
error("unable to write current sha1 into %s", oldrefname);
|
|
log_all_ref_updates = flag;
|
|
|
|
rollbacklog:
|
|
if (logmoved && rename(git_path("logs/%s", newrefname), git_path("logs/%s", oldrefname)))
|
|
error("unable to restore logfile %s from %s: %s",
|
|
oldrefname, newrefname, strerror(errno));
|
|
if (!logmoved && log &&
|
|
rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", oldrefname)))
|
|
error("unable to restore logfile %s from "TMP_RENAMED_LOG": %s",
|
|
oldrefname, strerror(errno));
|
|
|
|
return 1;
|
|
}
|
|
|
|
int close_ref(struct ref_lock *lock)
|
|
{
|
|
if (close_lock_file(lock->lk))
|
|
return -1;
|
|
lock->lock_fd = -1;
|
|
return 0;
|
|
}
|
|
|
|
int commit_ref(struct ref_lock *lock)
|
|
{
|
|
if (commit_lock_file(lock->lk))
|
|
return -1;
|
|
lock->lock_fd = -1;
|
|
return 0;
|
|
}
|
|
|
|
void unlock_ref(struct ref_lock *lock)
|
|
{
|
|
/* Do not free lock->lk -- atexit() still looks at them */
|
|
if (lock->lk)
|
|
rollback_lock_file(lock->lk);
|
|
free(lock->ref_name);
|
|
free(lock->orig_ref_name);
|
|
free(lock);
|
|
}
|
|
|
|
/*
|
|
* copy the reflog message msg to buf, which has been allocated sufficiently
|
|
* large, while cleaning up the whitespaces. Especially, convert LF to space,
|
|
* because reflog file is one line per entry.
|
|
*/
|
|
static int copy_msg(char *buf, const char *msg)
|
|
{
|
|
char *cp = buf;
|
|
char c;
|
|
int wasspace = 1;
|
|
|
|
*cp++ = '\t';
|
|
while ((c = *msg++)) {
|
|
if (wasspace && isspace(c))
|
|
continue;
|
|
wasspace = isspace(c);
|
|
if (wasspace)
|
|
c = ' ';
|
|
*cp++ = c;
|
|
}
|
|
while (buf < cp && isspace(cp[-1]))
|
|
cp--;
|
|
*cp++ = '\n';
|
|
return cp - buf;
|
|
}
|
|
|
|
int log_ref_setup(const char *refname, char *logfile, int bufsize)
|
|
{
|
|
int logfd, oflags = O_APPEND | O_WRONLY;
|
|
|
|
git_snpath(logfile, bufsize, "logs/%s", refname);
|
|
if (log_all_ref_updates &&
|
|
(!prefixcmp(refname, "refs/heads/") ||
|
|
!prefixcmp(refname, "refs/remotes/") ||
|
|
!prefixcmp(refname, "refs/notes/") ||
|
|
!strcmp(refname, "HEAD"))) {
|
|
if (safe_create_leading_directories(logfile) < 0)
|
|
return error("unable to create directory for %s",
|
|
logfile);
|
|
oflags |= O_CREAT;
|
|
}
|
|
|
|
logfd = open(logfile, oflags, 0666);
|
|
if (logfd < 0) {
|
|
if (!(oflags & O_CREAT) && errno == ENOENT)
|
|
return 0;
|
|
|
|
if ((oflags & O_CREAT) && errno == EISDIR) {
|
|
if (remove_empty_directories(logfile)) {
|
|
return error("There are still logs under '%s'",
|
|
logfile);
|
|
}
|
|
logfd = open(logfile, oflags, 0666);
|
|
}
|
|
|
|
if (logfd < 0)
|
|
return error("Unable to append to %s: %s",
|
|
logfile, strerror(errno));
|
|
}
|
|
|
|
adjust_shared_perm(logfile);
|
|
close(logfd);
|
|
return 0;
|
|
}
|
|
|
|
static int log_ref_write(const char *refname, const unsigned char *old_sha1,
|
|
const unsigned char *new_sha1, const char *msg)
|
|
{
|
|
int logfd, result, written, oflags = O_APPEND | O_WRONLY;
|
|
unsigned maxlen, len;
|
|
int msglen;
|
|
char log_file[PATH_MAX];
|
|
char *logrec;
|
|
const char *committer;
|
|
|
|
if (log_all_ref_updates < 0)
|
|
log_all_ref_updates = !is_bare_repository();
|
|
|
|
result = log_ref_setup(refname, log_file, sizeof(log_file));
|
|
if (result)
|
|
return result;
|
|
|
|
logfd = open(log_file, oflags);
|
|
if (logfd < 0)
|
|
return 0;
|
|
msglen = msg ? strlen(msg) : 0;
|
|
committer = git_committer_info(0);
|
|
maxlen = strlen(committer) + msglen + 100;
|
|
logrec = xmalloc(maxlen);
|
|
len = sprintf(logrec, "%s %s %s\n",
|
|
sha1_to_hex(old_sha1),
|
|
sha1_to_hex(new_sha1),
|
|
committer);
|
|
if (msglen)
|
|
len += copy_msg(logrec + len - 1, msg) - 1;
|
|
written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1;
|
|
free(logrec);
|
|
if (close(logfd) != 0 || written != len)
|
|
return error("Unable to append to %s", log_file);
|
|
return 0;
|
|
}
|
|
|
|
static int is_branch(const char *refname)
|
|
{
|
|
return !strcmp(refname, "HEAD") || !prefixcmp(refname, "refs/heads/");
|
|
}
|
|
|
|
int write_ref_sha1(struct ref_lock *lock,
|
|
const unsigned char *sha1, const char *logmsg)
|
|
{
|
|
static char term = '\n';
|
|
struct object *o;
|
|
|
|
if (!lock)
|
|
return -1;
|
|
if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) {
|
|
unlock_ref(lock);
|
|
return 0;
|
|
}
|
|
o = parse_object(sha1);
|
|
if (!o) {
|
|
error("Trying to write ref %s with nonexistent object %s",
|
|
lock->ref_name, sha1_to_hex(sha1));
|
|
unlock_ref(lock);
|
|
return -1;
|
|
}
|
|
if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) {
|
|
error("Trying to write non-commit object %s to branch %s",
|
|
sha1_to_hex(sha1), lock->ref_name);
|
|
unlock_ref(lock);
|
|
return -1;
|
|
}
|
|
if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 ||
|
|
write_in_full(lock->lock_fd, &term, 1) != 1
|
|
|| close_ref(lock) < 0) {
|
|
error("Couldn't write %s", lock->lk->filename);
|
|
unlock_ref(lock);
|
|
return -1;
|
|
}
|
|
clear_loose_ref_cache(get_ref_cache(NULL));
|
|
if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 ||
|
|
(strcmp(lock->ref_name, lock->orig_ref_name) &&
|
|
log_ref_write(lock->orig_ref_name, lock->old_sha1, sha1, logmsg) < 0)) {
|
|
unlock_ref(lock);
|
|
return -1;
|
|
}
|
|
if (strcmp(lock->orig_ref_name, "HEAD") != 0) {
|
|
/*
|
|
* Special hack: If a branch is updated directly and HEAD
|
|
* points to it (may happen on the remote side of a push
|
|
* for example) then logically the HEAD reflog should be
|
|
* updated too.
|
|
* A generic solution implies reverse symref information,
|
|
* but finding all symrefs pointing to the given branch
|
|
* would be rather costly for this rare event (the direct
|
|
* update of a branch) to be worth it. So let's cheat and
|
|
* check with HEAD only which should cover 99% of all usage
|
|
* scenarios (even 100% of the default ones).
|
|
*/
|
|
unsigned char head_sha1[20];
|
|
int head_flag;
|
|
const char *head_ref;
|
|
head_ref = resolve_ref_unsafe("HEAD", head_sha1, 1, &head_flag);
|
|
if (head_ref && (head_flag & REF_ISSYMREF) &&
|
|
!strcmp(head_ref, lock->ref_name))
|
|
log_ref_write("HEAD", lock->old_sha1, sha1, logmsg);
|
|
}
|
|
if (commit_ref(lock)) {
|
|
error("Couldn't set %s", lock->ref_name);
|
|
unlock_ref(lock);
|
|
return -1;
|
|
}
|
|
unlock_ref(lock);
|
|
return 0;
|
|
}
|
|
|
|
int create_symref(const char *ref_target, const char *refs_heads_master,
|
|
const char *logmsg)
|
|
{
|
|
const char *lockpath;
|
|
char ref[1000];
|
|
int fd, len, written;
|
|
char *git_HEAD = git_pathdup("%s", ref_target);
|
|
unsigned char old_sha1[20], new_sha1[20];
|
|
|
|
if (logmsg && read_ref(ref_target, old_sha1))
|
|
hashclr(old_sha1);
|
|
|
|
if (safe_create_leading_directories(git_HEAD) < 0)
|
|
return error("unable to create directory for %s", git_HEAD);
|
|
|
|
#ifndef NO_SYMLINK_HEAD
|
|
if (prefer_symlink_refs) {
|
|
unlink(git_HEAD);
|
|
if (!symlink(refs_heads_master, git_HEAD))
|
|
goto done;
|
|
fprintf(stderr, "no symlink - falling back to symbolic ref\n");
|
|
}
|
|
#endif
|
|
|
|
len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master);
|
|
if (sizeof(ref) <= len) {
|
|
error("refname too long: %s", refs_heads_master);
|
|
goto error_free_return;
|
|
}
|
|
lockpath = mkpath("%s.lock", git_HEAD);
|
|
fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666);
|
|
if (fd < 0) {
|
|
error("Unable to open %s for writing", lockpath);
|
|
goto error_free_return;
|
|
}
|
|
written = write_in_full(fd, ref, len);
|
|
if (close(fd) != 0 || written != len) {
|
|
error("Unable to write to %s", lockpath);
|
|
goto error_unlink_return;
|
|
}
|
|
if (rename(lockpath, git_HEAD) < 0) {
|
|
error("Unable to create %s", git_HEAD);
|
|
goto error_unlink_return;
|
|
}
|
|
if (adjust_shared_perm(git_HEAD)) {
|
|
error("Unable to fix permissions on %s", lockpath);
|
|
error_unlink_return:
|
|
unlink_or_warn(lockpath);
|
|
error_free_return:
|
|
free(git_HEAD);
|
|
return -1;
|
|
}
|
|
|
|
#ifndef NO_SYMLINK_HEAD
|
|
done:
|
|
#endif
|
|
if (logmsg && !read_ref(refs_heads_master, new_sha1))
|
|
log_ref_write(ref_target, old_sha1, new_sha1, logmsg);
|
|
|
|
free(git_HEAD);
|
|
return 0;
|
|
}
|
|
|
|
static char *ref_msg(const char *line, const char *endp)
|
|
{
|
|
const char *ep;
|
|
line += 82;
|
|
ep = memchr(line, '\n', endp - line);
|
|
if (!ep)
|
|
ep = endp;
|
|
return xmemdupz(line, ep - line);
|
|
}
|
|
|
|
int read_ref_at(const char *refname, unsigned long at_time, int cnt,
|
|
unsigned char *sha1, char **msg,
|
|
unsigned long *cutoff_time, int *cutoff_tz, int *cutoff_cnt)
|
|
{
|
|
const char *logfile, *logdata, *logend, *rec, *lastgt, *lastrec;
|
|
char *tz_c;
|
|
int logfd, tz, reccnt = 0;
|
|
struct stat st;
|
|
unsigned long date;
|
|
unsigned char logged_sha1[20];
|
|
void *log_mapped;
|
|
size_t mapsz;
|
|
|
|
logfile = git_path("logs/%s", refname);
|
|
logfd = open(logfile, O_RDONLY, 0);
|
|
if (logfd < 0)
|
|
die_errno("Unable to read log '%s'", logfile);
|
|
fstat(logfd, &st);
|
|
if (!st.st_size)
|
|
die("Log %s is empty.", logfile);
|
|
mapsz = xsize_t(st.st_size);
|
|
log_mapped = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, logfd, 0);
|
|
logdata = log_mapped;
|
|
close(logfd);
|
|
|
|
lastrec = NULL;
|
|
rec = logend = logdata + st.st_size;
|
|
while (logdata < rec) {
|
|
reccnt++;
|
|
if (logdata < rec && *(rec-1) == '\n')
|
|
rec--;
|
|
lastgt = NULL;
|
|
while (logdata < rec && *(rec-1) != '\n') {
|
|
rec--;
|
|
if (*rec == '>')
|
|
lastgt = rec;
|
|
}
|
|
if (!lastgt)
|
|
die("Log %s is corrupt.", logfile);
|
|
date = strtoul(lastgt + 1, &tz_c, 10);
|
|
if (date <= at_time || cnt == 0) {
|
|
tz = strtoul(tz_c, NULL, 10);
|
|
if (msg)
|
|
*msg = ref_msg(rec, logend);
|
|
if (cutoff_time)
|
|
*cutoff_time = date;
|
|
if (cutoff_tz)
|
|
*cutoff_tz = tz;
|
|
if (cutoff_cnt)
|
|
*cutoff_cnt = reccnt - 1;
|
|
if (lastrec) {
|
|
if (get_sha1_hex(lastrec, logged_sha1))
|
|
die("Log %s is corrupt.", logfile);
|
|
if (get_sha1_hex(rec + 41, sha1))
|
|
die("Log %s is corrupt.", logfile);
|
|
if (hashcmp(logged_sha1, sha1)) {
|
|
warning("Log %s has gap after %s.",
|
|
logfile, show_date(date, tz, DATE_RFC2822));
|
|
}
|
|
}
|
|
else if (date == at_time) {
|
|
if (get_sha1_hex(rec + 41, sha1))
|
|
die("Log %s is corrupt.", logfile);
|
|
}
|
|
else {
|
|
if (get_sha1_hex(rec + 41, logged_sha1))
|
|
die("Log %s is corrupt.", logfile);
|
|
if (hashcmp(logged_sha1, sha1)) {
|
|
warning("Log %s unexpectedly ended on %s.",
|
|
logfile, show_date(date, tz, DATE_RFC2822));
|
|
}
|
|
}
|
|
munmap(log_mapped, mapsz);
|
|
return 0;
|
|
}
|
|
lastrec = rec;
|
|
if (cnt > 0)
|
|
cnt--;
|
|
}
|
|
|
|
rec = logdata;
|
|
while (rec < logend && *rec != '>' && *rec != '\n')
|
|
rec++;
|
|
if (rec == logend || *rec == '\n')
|
|
die("Log %s is corrupt.", logfile);
|
|
date = strtoul(rec + 1, &tz_c, 10);
|
|
tz = strtoul(tz_c, NULL, 10);
|
|
if (get_sha1_hex(logdata, sha1))
|
|
die("Log %s is corrupt.", logfile);
|
|
if (is_null_sha1(sha1)) {
|
|
if (get_sha1_hex(logdata + 41, sha1))
|
|
die("Log %s is corrupt.", logfile);
|
|
}
|
|
if (msg)
|
|
*msg = ref_msg(logdata, logend);
|
|
munmap(log_mapped, mapsz);
|
|
|
|
if (cutoff_time)
|
|
*cutoff_time = date;
|
|
if (cutoff_tz)
|
|
*cutoff_tz = tz;
|
|
if (cutoff_cnt)
|
|
*cutoff_cnt = reccnt;
|
|
return 1;
|
|
}
|
|
|
|
int for_each_recent_reflog_ent(const char *refname, each_reflog_ent_fn fn, long ofs, void *cb_data)
|
|
{
|
|
const char *logfile;
|
|
FILE *logfp;
|
|
struct strbuf sb = STRBUF_INIT;
|
|
int ret = 0;
|
|
|
|
logfile = git_path("logs/%s", refname);
|
|
logfp = fopen(logfile, "r");
|
|
if (!logfp)
|
|
return -1;
|
|
|
|
if (ofs) {
|
|
struct stat statbuf;
|
|
if (fstat(fileno(logfp), &statbuf) ||
|
|
statbuf.st_size < ofs ||
|
|
fseek(logfp, -ofs, SEEK_END) ||
|
|
strbuf_getwholeline(&sb, logfp, '\n')) {
|
|
fclose(logfp);
|
|
strbuf_release(&sb);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
while (!strbuf_getwholeline(&sb, logfp, '\n')) {
|
|
unsigned char osha1[20], nsha1[20];
|
|
char *email_end, *message;
|
|
unsigned long timestamp;
|
|
int tz;
|
|
|
|
/* old SP new SP name <email> SP time TAB msg LF */
|
|
if (sb.len < 83 || sb.buf[sb.len - 1] != '\n' ||
|
|
get_sha1_hex(sb.buf, osha1) || sb.buf[40] != ' ' ||
|
|
get_sha1_hex(sb.buf + 41, nsha1) || sb.buf[81] != ' ' ||
|
|
!(email_end = strchr(sb.buf + 82, '>')) ||
|
|
email_end[1] != ' ' ||
|
|
!(timestamp = strtoul(email_end + 2, &message, 10)) ||
|
|
!message || message[0] != ' ' ||
|
|
(message[1] != '+' && message[1] != '-') ||
|
|
!isdigit(message[2]) || !isdigit(message[3]) ||
|
|
!isdigit(message[4]) || !isdigit(message[5]))
|
|
continue; /* corrupt? */
|
|
email_end[1] = '\0';
|
|
tz = strtol(message + 1, NULL, 10);
|
|
if (message[6] != '\t')
|
|
message += 6;
|
|
else
|
|
message += 7;
|
|
ret = fn(osha1, nsha1, sb.buf + 82, timestamp, tz, message,
|
|
cb_data);
|
|
if (ret)
|
|
break;
|
|
}
|
|
fclose(logfp);
|
|
strbuf_release(&sb);
|
|
return ret;
|
|
}
|
|
|
|
int for_each_reflog_ent(const char *refname, each_reflog_ent_fn fn, void *cb_data)
|
|
{
|
|
return for_each_recent_reflog_ent(refname, fn, 0, cb_data);
|
|
}
|
|
|
|
static int do_for_each_reflog(const char *base, each_ref_fn fn, void *cb_data)
|
|
{
|
|
DIR *dir = opendir(git_path("logs/%s", base));
|
|
int retval = 0;
|
|
|
|
if (dir) {
|
|
struct dirent *de;
|
|
int baselen = strlen(base);
|
|
char *log = xmalloc(baselen + 257);
|
|
|
|
memcpy(log, base, baselen);
|
|
if (baselen && base[baselen-1] != '/')
|
|
log[baselen++] = '/';
|
|
|
|
while ((de = readdir(dir)) != NULL) {
|
|
struct stat st;
|
|
int namelen;
|
|
|
|
if (de->d_name[0] == '.')
|
|
continue;
|
|
namelen = strlen(de->d_name);
|
|
if (namelen > 255)
|
|
continue;
|
|
if (has_extension(de->d_name, ".lock"))
|
|
continue;
|
|
memcpy(log + baselen, de->d_name, namelen+1);
|
|
if (stat(git_path("logs/%s", log), &st) < 0)
|
|
continue;
|
|
if (S_ISDIR(st.st_mode)) {
|
|
retval = do_for_each_reflog(log, fn, cb_data);
|
|
} else {
|
|
unsigned char sha1[20];
|
|
if (read_ref_full(log, sha1, 0, NULL))
|
|
retval = error("bad ref for %s", log);
|
|
else
|
|
retval = fn(log, sha1, 0, cb_data);
|
|
}
|
|
if (retval)
|
|
break;
|
|
}
|
|
free(log);
|
|
closedir(dir);
|
|
}
|
|
else if (*base)
|
|
return errno;
|
|
return retval;
|
|
}
|
|
|
|
int for_each_reflog(each_ref_fn fn, void *cb_data)
|
|
{
|
|
return do_for_each_reflog("", fn, cb_data);
|
|
}
|
|
|
|
int update_ref(const char *action, const char *refname,
|
|
const unsigned char *sha1, const unsigned char *oldval,
|
|
int flags, enum action_on_err onerr)
|
|
{
|
|
static struct ref_lock *lock;
|
|
lock = lock_any_ref_for_update(refname, oldval, flags);
|
|
if (!lock) {
|
|
const char *str = "Cannot lock the ref '%s'.";
|
|
switch (onerr) {
|
|
case MSG_ON_ERR: error(str, refname); break;
|
|
case DIE_ON_ERR: die(str, refname); break;
|
|
case QUIET_ON_ERR: break;
|
|
}
|
|
return 1;
|
|
}
|
|
if (write_ref_sha1(lock, sha1, action) < 0) {
|
|
const char *str = "Cannot update the ref '%s'.";
|
|
switch (onerr) {
|
|
case MSG_ON_ERR: error(str, refname); break;
|
|
case DIE_ON_ERR: die(str, refname); break;
|
|
case QUIET_ON_ERR: break;
|
|
}
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int ref_exists(const char *refname)
|
|
{
|
|
unsigned char sha1[20];
|
|
return !!resolve_ref_unsafe(refname, sha1, 1, NULL);
|
|
}
|
|
|
|
struct ref *find_ref_by_name(const struct ref *list, const char *name)
|
|
{
|
|
for ( ; list; list = list->next)
|
|
if (!strcmp(list->name, name))
|
|
return (struct ref *)list;
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* generate a format suitable for scanf from a ref_rev_parse_rules
|
|
* rule, that is replace the "%.*s" spec with a "%s" spec
|
|
*/
|
|
static void gen_scanf_fmt(char *scanf_fmt, const char *rule)
|
|
{
|
|
char *spec;
|
|
|
|
spec = strstr(rule, "%.*s");
|
|
if (!spec || strstr(spec + 4, "%.*s"))
|
|
die("invalid rule in ref_rev_parse_rules: %s", rule);
|
|
|
|
/* copy all until spec */
|
|
strncpy(scanf_fmt, rule, spec - rule);
|
|
scanf_fmt[spec - rule] = '\0';
|
|
/* copy new spec */
|
|
strcat(scanf_fmt, "%s");
|
|
/* copy remaining rule */
|
|
strcat(scanf_fmt, spec + 4);
|
|
|
|
return;
|
|
}
|
|
|
|
char *shorten_unambiguous_ref(const char *refname, int strict)
|
|
{
|
|
int i;
|
|
static char **scanf_fmts;
|
|
static int nr_rules;
|
|
char *short_name;
|
|
|
|
/* pre generate scanf formats from ref_rev_parse_rules[] */
|
|
if (!nr_rules) {
|
|
size_t total_len = 0;
|
|
|
|
/* the rule list is NULL terminated, count them first */
|
|
for (; ref_rev_parse_rules[nr_rules]; nr_rules++)
|
|
/* no +1 because strlen("%s") < strlen("%.*s") */
|
|
total_len += strlen(ref_rev_parse_rules[nr_rules]);
|
|
|
|
scanf_fmts = xmalloc(nr_rules * sizeof(char *) + total_len);
|
|
|
|
total_len = 0;
|
|
for (i = 0; i < nr_rules; i++) {
|
|
scanf_fmts[i] = (char *)&scanf_fmts[nr_rules]
|
|
+ total_len;
|
|
gen_scanf_fmt(scanf_fmts[i], ref_rev_parse_rules[i]);
|
|
total_len += strlen(ref_rev_parse_rules[i]);
|
|
}
|
|
}
|
|
|
|
/* bail out if there are no rules */
|
|
if (!nr_rules)
|
|
return xstrdup(refname);
|
|
|
|
/* buffer for scanf result, at most refname must fit */
|
|
short_name = xstrdup(refname);
|
|
|
|
/* skip first rule, it will always match */
|
|
for (i = nr_rules - 1; i > 0 ; --i) {
|
|
int j;
|
|
int rules_to_fail = i;
|
|
int short_name_len;
|
|
|
|
if (1 != sscanf(refname, scanf_fmts[i], short_name))
|
|
continue;
|
|
|
|
short_name_len = strlen(short_name);
|
|
|
|
/*
|
|
* in strict mode, all (except the matched one) rules
|
|
* must fail to resolve to a valid non-ambiguous ref
|
|
*/
|
|
if (strict)
|
|
rules_to_fail = nr_rules;
|
|
|
|
/*
|
|
* check if the short name resolves to a valid ref,
|
|
* but use only rules prior to the matched one
|
|
*/
|
|
for (j = 0; j < rules_to_fail; j++) {
|
|
const char *rule = ref_rev_parse_rules[j];
|
|
char refname[PATH_MAX];
|
|
|
|
/* skip matched rule */
|
|
if (i == j)
|
|
continue;
|
|
|
|
/*
|
|
* the short name is ambiguous, if it resolves
|
|
* (with this previous rule) to a valid ref
|
|
* read_ref() returns 0 on success
|
|
*/
|
|
mksnpath(refname, sizeof(refname),
|
|
rule, short_name_len, short_name);
|
|
if (ref_exists(refname))
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* short name is non-ambiguous if all previous rules
|
|
* haven't resolved to a valid ref
|
|
*/
|
|
if (j == rules_to_fail)
|
|
return short_name;
|
|
}
|
|
|
|
free(short_name);
|
|
return xstrdup(refname);
|
|
}
|