mirror of
https://github.com/git/git
synced 2024-08-24 18:26:02 +00:00
![Lars Hjemli](/assets/img/avatar_default.png)
If git_config_rename_section() fails, rename_ref() used to return 1, which left HEAD pointing to an absent refs/heads file (since the actual renaming had already occurred). Signed-off-by: Lars Hjemli <hjemli@gmail.com> Signed-off-by: Junio C Hamano <junkio@cox.net>
1290 lines
31 KiB
C
1290 lines
31 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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/* ISSYMREF=01 and ISPACKED=02 are public interfaces */
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#define REF_KNOWS_PEELED 04
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struct ref_list {
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struct ref_list *next;
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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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char name[FLEX_ARRAY];
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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_list *add_ref(const char *name, const unsigned char *sha1,
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int flag, struct ref_list *list,
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struct ref_list **new_entry)
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{
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int len;
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struct ref_list **p = &list, *entry;
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/* Find the place to insert the ref into.. */
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while ((entry = *p) != NULL) {
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int cmp = strcmp(entry->name, name);
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if (cmp > 0)
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break;
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/* Same as existing entry? */
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if (!cmp) {
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if (new_entry)
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*new_entry = entry;
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return list;
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}
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p = &entry->next;
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}
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/* Allocate it and add it in.. */
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len = strlen(name) + 1;
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entry = xmalloc(sizeof(struct ref_list) + len);
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hashcpy(entry->sha1, sha1);
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hashclr(entry->peeled);
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memcpy(entry->name, name, len);
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entry->flag = flag;
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entry->next = *p;
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*p = entry;
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if (new_entry)
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*new_entry = entry;
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return list;
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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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struct cached_refs {
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char did_loose;
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char did_packed;
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struct ref_list *loose;
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struct ref_list *packed;
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} cached_refs;
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static void free_ref_list(struct ref_list *list)
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{
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struct ref_list *next;
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for ( ; list; list = next) {
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next = list->next;
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free(list);
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}
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}
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static void invalidate_cached_refs(void)
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{
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struct cached_refs *ca = &cached_refs;
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if (ca->did_loose && ca->loose)
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free_ref_list(ca->loose);
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if (ca->did_packed && ca->packed)
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free_ref_list(ca->packed);
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ca->loose = ca->packed = NULL;
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ca->did_loose = ca->did_packed = 0;
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}
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static void read_packed_refs(FILE *f, struct cached_refs *cached_refs)
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{
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struct ref_list *list = NULL;
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struct ref_list *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 *name;
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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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name = parse_ref_line(refline, sha1);
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if (name) {
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list = add_ref(name, sha1, flag, list, &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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cached_refs->packed = list;
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}
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static struct ref_list *get_packed_refs(void)
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{
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if (!cached_refs.did_packed) {
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FILE *f = fopen(git_path("packed-refs"), "r");
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cached_refs.packed = NULL;
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if (f) {
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read_packed_refs(f, &cached_refs);
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fclose(f);
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}
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cached_refs.did_packed = 1;
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}
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return cached_refs.packed;
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}
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static struct ref_list *get_ref_dir(const char *base, struct ref_list *list)
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{
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DIR *dir = opendir(git_path("%s", base));
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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 *ref = xmalloc(baselen + 257);
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memcpy(ref, base, baselen);
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if (baselen && base[baselen-1] != '/')
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ref[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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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(ref + baselen, de->d_name, namelen+1);
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if (stat(git_path("%s", ref), &st) < 0)
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continue;
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if (S_ISDIR(st.st_mode)) {
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list = get_ref_dir(ref, list);
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continue;
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}
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if (!resolve_ref(ref, sha1, 1, &flag)) {
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error("%s points nowhere!", ref);
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continue;
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}
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list = add_ref(ref, sha1, flag, list, NULL);
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}
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free(ref);
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closedir(dir);
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}
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return list;
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}
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static struct ref_list *get_loose_refs(void)
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{
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if (!cached_refs.did_loose) {
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cached_refs.loose = get_ref_dir("refs", NULL);
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cached_refs.did_loose = 1;
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}
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return cached_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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const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *flag)
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{
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int depth = MAXDEPTH, len;
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char buffer[256];
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static char ref_buffer[256];
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if (flag)
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*flag = 0;
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for (;;) {
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const char *path = git_path("%s", ref);
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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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/* Special case: non-existing file.
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* Not having the refs/heads/new-branch is OK
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* if we are writing into it, so is .git/HEAD
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* that points at refs/heads/master still to be
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* born. It is NOT OK if we are resolving for
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* reading.
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*/
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if (lstat(path, &st) < 0) {
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struct ref_list *list = get_packed_refs();
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while (list) {
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if (!strcmp(ref, list->name)) {
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hashcpy(sha1, list->sha1);
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if (flag)
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*flag |= REF_ISPACKED;
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return ref;
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}
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list = list->next;
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}
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if (reading || errno != ENOENT)
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return NULL;
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hashclr(sha1);
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return ref;
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}
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/* Follow "normalized" - ie "refs/.." symlinks by hand */
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if (S_ISLNK(st.st_mode)) {
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len = readlink(path, buffer, sizeof(buffer)-1);
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if (len >= 5 && !memcmp("refs/", buffer, 5)) {
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buffer[len] = 0;
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strcpy(ref_buffer, buffer);
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ref = ref_buffer;
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if (flag)
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*flag |= REF_ISSYMREF;
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continue;
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}
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}
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/* Is it a directory? */
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if (S_ISDIR(st.st_mode)) {
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errno = EISDIR;
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return NULL;
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}
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/*
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* Anything else, just open it and try to use it as
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* a ref
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*/
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fd = open(path, O_RDONLY);
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if (fd < 0)
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return NULL;
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len = read_in_full(fd, buffer, sizeof(buffer)-1);
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close(fd);
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/*
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* Is it a symbolic ref?
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*/
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if (len < 4 || memcmp("ref:", buffer, 4))
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break;
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buf = buffer + 4;
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len -= 4;
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while (len && isspace(*buf))
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buf++, len--;
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while (len && isspace(buf[len-1]))
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len--;
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buf[len] = 0;
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memcpy(ref_buffer, buf, len + 1);
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ref = ref_buffer;
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if (flag)
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*flag |= REF_ISSYMREF;
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}
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if (len < 40 || get_sha1_hex(buffer, sha1))
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return NULL;
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return ref;
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}
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int read_ref(const char *ref, unsigned char *sha1)
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{
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if (resolve_ref(ref, sha1, 1, NULL))
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return 0;
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return -1;
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}
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static int do_one_ref(const char *base, each_ref_fn fn, int trim,
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void *cb_data, struct ref_list *entry)
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{
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if (strncmp(base, entry->name, trim))
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return 0;
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if (is_null_sha1(entry->sha1))
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return 0;
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if (!has_sha1_file(entry->sha1)) {
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error("%s does not point to a valid object!", entry->name);
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return 0;
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}
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return fn(entry->name + trim, entry->sha1, entry->flag, cb_data);
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}
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int peel_ref(const char *ref, unsigned char *sha1)
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{
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int flag;
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unsigned char base[20];
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struct object *o;
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if (!resolve_ref(ref, base, 1, &flag))
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return -1;
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if ((flag & REF_ISPACKED)) {
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struct ref_list *list = get_packed_refs();
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while (list) {
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if (!strcmp(list->name, ref)) {
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if (list->flag & REF_KNOWS_PEELED) {
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hashcpy(sha1, list->peeled);
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return 0;
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}
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/* older pack-refs did not leave peeled ones */
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break;
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}
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list = list->next;
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}
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}
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/* fallback - callers should not call this for unpacked refs */
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o = parse_object(base);
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if (o->type == OBJ_TAG) {
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o = deref_tag(o, ref, 0);
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if (o) {
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hashcpy(sha1, o->sha1);
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return 0;
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}
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}
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return -1;
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}
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static int do_for_each_ref(const char *base, each_ref_fn fn, int trim,
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void *cb_data)
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{
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int retval;
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struct ref_list *packed = get_packed_refs();
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struct ref_list *loose = get_loose_refs();
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while (packed && loose) {
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struct ref_list *entry;
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int cmp = strcmp(packed->name, loose->name);
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if (!cmp) {
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packed = packed->next;
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continue;
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}
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if (cmp > 0) {
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entry = loose;
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loose = loose->next;
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} else {
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entry = packed;
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packed = packed->next;
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}
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retval = do_one_ref(base, fn, trim, cb_data, entry);
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if (retval)
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return retval;
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}
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for (packed = packed ? packed : loose; packed; packed = packed->next) {
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retval = do_one_ref(base, fn, trim, cb_data, packed);
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if (retval)
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return retval;
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}
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return 0;
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}
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int head_ref(each_ref_fn fn, void *cb_data)
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{
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unsigned char sha1[20];
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int flag;
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if (resolve_ref("HEAD", sha1, 1, &flag))
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return fn("HEAD", sha1, flag, cb_data);
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return 0;
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}
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int for_each_ref(each_ref_fn fn, void *cb_data)
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{
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return do_for_each_ref("refs/", fn, 0, cb_data);
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}
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int for_each_tag_ref(each_ref_fn fn, void *cb_data)
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{
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return do_for_each_ref("refs/tags/", fn, 10, cb_data);
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}
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int for_each_branch_ref(each_ref_fn fn, void *cb_data)
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{
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return do_for_each_ref("refs/heads/", fn, 11, cb_data);
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}
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int for_each_remote_ref(each_ref_fn fn, void *cb_data)
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{
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return do_for_each_ref("refs/remotes/", fn, 13, cb_data);
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}
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/* NEEDSWORK: This is only used by ssh-upload and it should go; the
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* caller should do resolve_ref or read_ref like everybody else. Or
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* maybe everybody else should use get_ref_sha1() instead of doing
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* read_ref().
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*/
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int get_ref_sha1(const char *ref, unsigned char *sha1)
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{
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if (check_ref_format(ref))
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return -1;
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return read_ref(mkpath("refs/%s", ref), sha1);
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}
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/*
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* Make sure "ref" is something reasonable to have under ".git/refs/";
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* We do not like it if:
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*
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* - any path component of it begins with ".", or
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* - it has double dots "..", or
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* - it has ASCII control character, "~", "^", ":" or SP, anywhere, or
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* - it ends with a "/".
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*/
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static inline int bad_ref_char(int ch)
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{
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return (((unsigned) ch) <= ' ' ||
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ch == '~' || ch == '^' || ch == ':' ||
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/* 2.13 Pattern Matching Notation */
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ch == '?' || ch == '*' || ch == '[');
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}
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int check_ref_format(const char *ref)
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{
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int ch, level;
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const char *cp = ref;
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level = 0;
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while (1) {
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while ((ch = *cp++) == '/')
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; /* tolerate duplicated slashes */
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if (!ch)
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return -1; /* should not end with slashes */
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/* we are at the beginning of the path component */
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if (ch == '.' || bad_ref_char(ch))
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return -1;
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/* scan the rest of the path component */
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while ((ch = *cp++) != 0) {
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if (bad_ref_char(ch))
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return -1;
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if (ch == '/')
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break;
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if (ch == '.' && *cp == '.')
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return -1;
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}
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level++;
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if (!ch) {
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if (level < 2)
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return -2; /* at least of form "heads/blah" */
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return 0;
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}
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}
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}
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static struct ref_lock *verify_lock(struct ref_lock *lock,
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const unsigned char *old_sha1, int mustexist)
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{
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if (!resolve_ref(lock->ref_name, lock->old_sha1, mustexist, NULL)) {
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error("Can't verify ref %s", lock->ref_name);
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unlock_ref(lock);
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return NULL;
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}
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if (hashcmp(lock->old_sha1, old_sha1)) {
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error("Ref %s is at %s but expected %s", lock->ref_name,
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sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1));
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unlock_ref(lock);
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return NULL;
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}
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return lock;
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}
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static int remove_empty_dir_recursive(char *path, int len)
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{
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DIR *dir = opendir(path);
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struct dirent *e;
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int ret = 0;
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if (!dir)
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return -1;
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if (path[len-1] != '/')
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path[len++] = '/';
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while ((e = readdir(dir)) != NULL) {
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struct stat st;
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int namlen;
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if ((e->d_name[0] == '.') &&
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((e->d_name[1] == 0) ||
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((e->d_name[1] == '.') && e->d_name[2] == 0)))
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continue; /* "." and ".." */
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namlen = strlen(e->d_name);
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if ((len + namlen < PATH_MAX) &&
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strcpy(path + len, e->d_name) &&
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!lstat(path, &st) &&
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S_ISDIR(st.st_mode) &&
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!remove_empty_dir_recursive(path, len + namlen))
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continue; /* happy */
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/* path too long, stat fails, or non-directory still exists */
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ret = -1;
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break;
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}
|
|
closedir(dir);
|
|
if (!ret) {
|
|
path[len] = 0;
|
|
ret = rmdir(path);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int remove_empty_directories(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.
|
|
*/
|
|
char path[PATH_MAX];
|
|
int len = strlen(file);
|
|
|
|
if (len >= PATH_MAX) /* path too long ;-) */
|
|
return -1;
|
|
strcpy(path, file);
|
|
return remove_empty_dir_recursive(path, len);
|
|
}
|
|
|
|
static int is_refname_available(const char *ref, const char *oldref,
|
|
struct ref_list *list, int quiet)
|
|
{
|
|
int namlen = strlen(ref); /* e.g. 'foo/bar' */
|
|
while (list) {
|
|
/* list->name could be 'foo' or 'foo/bar/baz' */
|
|
if (!oldref || strcmp(oldref, list->name)) {
|
|
int len = strlen(list->name);
|
|
int cmplen = (namlen < len) ? namlen : len;
|
|
const char *lead = (namlen < len) ? list->name : ref;
|
|
if (!strncmp(ref, list->name, cmplen) &&
|
|
lead[cmplen] == '/') {
|
|
if (!quiet)
|
|
error("'%s' exists; cannot create '%s'",
|
|
list->name, ref);
|
|
return 0;
|
|
}
|
|
}
|
|
list = list->next;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char *old_sha1, int *flag)
|
|
{
|
|
char *ref_file;
|
|
const char *orig_ref = ref;
|
|
struct ref_lock *lock;
|
|
struct stat st;
|
|
int last_errno = 0;
|
|
int mustexist = (old_sha1 && !is_null_sha1(old_sha1));
|
|
|
|
lock = xcalloc(1, sizeof(struct ref_lock));
|
|
lock->lock_fd = -1;
|
|
|
|
ref = resolve_ref(ref, lock->old_sha1, mustexist, flag);
|
|
if (!ref && 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_ref);
|
|
if (remove_empty_directories(ref_file)) {
|
|
last_errno = errno;
|
|
error("there are still refs under '%s'", orig_ref);
|
|
goto error_return;
|
|
}
|
|
ref = resolve_ref(orig_ref, lock->old_sha1, mustexist, flag);
|
|
}
|
|
if (!ref) {
|
|
last_errno = errno;
|
|
error("unable to resolve reference %s: %s",
|
|
orig_ref, strerror(errno));
|
|
goto error_return;
|
|
}
|
|
/* 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 (is_null_sha1(lock->old_sha1) &&
|
|
!is_refname_available(ref, NULL, get_packed_refs(), 0))
|
|
goto error_return;
|
|
|
|
lock->lk = xcalloc(1, sizeof(struct lock_file));
|
|
|
|
lock->ref_name = xstrdup(ref);
|
|
lock->orig_ref_name = xstrdup(orig_ref);
|
|
ref_file = git_path("%s", ref);
|
|
lock->force_write = lstat(ref_file, &st) && errno == ENOENT;
|
|
|
|
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, 1);
|
|
|
|
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 *ref, const unsigned char *old_sha1)
|
|
{
|
|
char refpath[PATH_MAX];
|
|
if (check_ref_format(ref))
|
|
return NULL;
|
|
strcpy(refpath, mkpath("refs/%s", ref));
|
|
return lock_ref_sha1_basic(refpath, old_sha1, NULL);
|
|
}
|
|
|
|
struct ref_lock *lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1)
|
|
{
|
|
if (check_ref_format(ref) == -1)
|
|
return NULL;
|
|
return lock_ref_sha1_basic(ref, old_sha1, NULL);
|
|
}
|
|
|
|
static struct lock_file packlock;
|
|
|
|
static int repack_without_ref(const char *refname)
|
|
{
|
|
struct ref_list *list, *packed_ref_list;
|
|
int fd;
|
|
int found = 0;
|
|
|
|
packed_ref_list = get_packed_refs();
|
|
for (list = packed_ref_list; list; list = list->next) {
|
|
if (!strcmp(refname, list->name)) {
|
|
found = 1;
|
|
break;
|
|
}
|
|
}
|
|
if (!found)
|
|
return 0;
|
|
fd = hold_lock_file_for_update(&packlock, git_path("packed-refs"), 0);
|
|
if (fd < 0)
|
|
return error("cannot delete '%s' from packed refs", refname);
|
|
|
|
for (list = packed_ref_list; list; list = list->next) {
|
|
char line[PATH_MAX + 100];
|
|
int len;
|
|
|
|
if (!strcmp(refname, list->name))
|
|
continue;
|
|
len = snprintf(line, sizeof(line), "%s %s\n",
|
|
sha1_to_hex(list->sha1), list->name);
|
|
/* this should not happen but just being defensive */
|
|
if (len > sizeof(line))
|
|
die("too long a refname '%s'", list->name);
|
|
write_or_die(fd, line, len);
|
|
}
|
|
return commit_lock_file(&packlock);
|
|
}
|
|
|
|
int delete_ref(const char *refname, unsigned char *sha1)
|
|
{
|
|
struct ref_lock *lock;
|
|
int err, i, ret = 0, flag = 0;
|
|
|
|
lock = lock_ref_sha1_basic(refname, sha1, &flag);
|
|
if (!lock)
|
|
return 1;
|
|
if (!(flag & REF_ISPACKED)) {
|
|
/* loose */
|
|
i = strlen(lock->lk->filename) - 5; /* .lock */
|
|
lock->lk->filename[i] = 0;
|
|
err = unlink(lock->lk->filename);
|
|
if (err) {
|
|
ret = 1;
|
|
error("unlink(%s) failed: %s",
|
|
lock->lk->filename, strerror(errno));
|
|
}
|
|
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);
|
|
|
|
err = unlink(git_path("logs/%s", lock->ref_name));
|
|
if (err && errno != ENOENT)
|
|
fprintf(stderr, "warning: unlink(%s) failed: %s",
|
|
git_path("logs/%s", lock->ref_name), strerror(errno));
|
|
invalidate_cached_refs();
|
|
unlock_ref(lock);
|
|
return ret;
|
|
}
|
|
|
|
int rename_ref(const char *oldref, const char *newref, const char *logmsg)
|
|
{
|
|
static const char renamed_ref[] = "RENAMED-REF";
|
|
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", oldref), &loginfo);
|
|
|
|
if (S_ISLNK(loginfo.st_mode))
|
|
return error("reflog for %s is a symlink", oldref);
|
|
|
|
if (!resolve_ref(oldref, orig_sha1, 1, &flag))
|
|
return error("refname %s not found", oldref);
|
|
|
|
if (!is_refname_available(newref, oldref, get_packed_refs(), 0))
|
|
return 1;
|
|
|
|
if (!is_refname_available(newref, oldref, get_loose_refs(), 0))
|
|
return 1;
|
|
|
|
lock = lock_ref_sha1_basic(renamed_ref, NULL, NULL);
|
|
if (!lock)
|
|
return error("unable to lock %s", renamed_ref);
|
|
lock->force_write = 1;
|
|
if (write_ref_sha1(lock, orig_sha1, logmsg))
|
|
return error("unable to save current sha1 in %s", renamed_ref);
|
|
|
|
if (log && rename(git_path("logs/%s", oldref), git_path("tmp-renamed-log")))
|
|
return error("unable to move logfile logs/%s to tmp-renamed-log: %s",
|
|
oldref, strerror(errno));
|
|
|
|
if (delete_ref(oldref, orig_sha1)) {
|
|
error("unable to delete old %s", oldref);
|
|
goto rollback;
|
|
}
|
|
|
|
if (resolve_ref(newref, sha1, 1, &flag) && delete_ref(newref, sha1)) {
|
|
if (errno==EISDIR) {
|
|
if (remove_empty_directories(git_path("%s", newref))) {
|
|
error("Directory not empty: %s", newref);
|
|
goto rollback;
|
|
}
|
|
} else {
|
|
error("unable to delete existing %s", newref);
|
|
goto rollback;
|
|
}
|
|
}
|
|
|
|
if (log && safe_create_leading_directories(git_path("logs/%s", newref))) {
|
|
error("unable to create directory for %s", newref);
|
|
goto rollback;
|
|
}
|
|
|
|
retry:
|
|
if (log && rename(git_path("tmp-renamed-log"), git_path("logs/%s", newref))) {
|
|
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", newref))) {
|
|
error("Directory not empty: logs/%s", newref);
|
|
goto rollback;
|
|
}
|
|
goto retry;
|
|
} else {
|
|
error("unable to move logfile tmp-renamed-log to logs/%s: %s",
|
|
newref, strerror(errno));
|
|
goto rollback;
|
|
}
|
|
}
|
|
logmoved = log;
|
|
|
|
lock = lock_ref_sha1_basic(newref, NULL, NULL);
|
|
if (!lock) {
|
|
error("unable to lock %s for update", newref);
|
|
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", newref);
|
|
goto rollback;
|
|
}
|
|
|
|
if (!prefixcmp(oldref, "refs/heads/") &&
|
|
!prefixcmp(newref, "refs/heads/")) {
|
|
char oldsection[1024], newsection[1024];
|
|
|
|
snprintf(oldsection, 1024, "branch.%s", oldref + 11);
|
|
snprintf(newsection, 1024, "branch.%s", newref + 11);
|
|
if (git_config_rename_section(oldsection, newsection) < 0)
|
|
error("unable to update config-file");
|
|
}
|
|
|
|
return 0;
|
|
|
|
rollback:
|
|
lock = lock_ref_sha1_basic(oldref, NULL, NULL);
|
|
if (!lock) {
|
|
error("unable to lock %s for rollback", oldref);
|
|
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", oldref);
|
|
log_all_ref_updates = flag;
|
|
|
|
rollbacklog:
|
|
if (logmoved && rename(git_path("logs/%s", newref), git_path("logs/%s", oldref)))
|
|
error("unable to restore logfile %s from %s: %s",
|
|
oldref, newref, strerror(errno));
|
|
if (!logmoved && log &&
|
|
rename(git_path("tmp-renamed-log"), git_path("logs/%s", oldref)))
|
|
error("unable to restore logfile %s from tmp-renamed-log: %s",
|
|
oldref, strerror(errno));
|
|
|
|
return 1;
|
|
}
|
|
|
|
void unlock_ref(struct ref_lock *lock)
|
|
{
|
|
if (lock->lock_fd >= 0) {
|
|
close(lock->lock_fd);
|
|
/* 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);
|
|
}
|
|
|
|
static int log_ref_write(const char *ref_name, const unsigned char *old_sha1,
|
|
const unsigned char *new_sha1, const char *msg)
|
|
{
|
|
int logfd, written, oflags = O_APPEND | O_WRONLY;
|
|
unsigned maxlen, len;
|
|
int msglen;
|
|
char *log_file, *logrec;
|
|
const char *committer;
|
|
|
|
if (log_all_ref_updates < 0)
|
|
log_all_ref_updates = !is_bare_repository();
|
|
|
|
log_file = git_path("logs/%s", ref_name);
|
|
|
|
if (log_all_ref_updates &&
|
|
(!prefixcmp(ref_name, "refs/heads/") ||
|
|
!prefixcmp(ref_name, "refs/remotes/") ||
|
|
!strcmp(ref_name, "HEAD"))) {
|
|
if (safe_create_leading_directories(log_file) < 0)
|
|
return error("unable to create directory for %s",
|
|
log_file);
|
|
oflags |= O_CREAT;
|
|
}
|
|
|
|
logfd = open(log_file, oflags, 0666);
|
|
if (logfd < 0) {
|
|
if (!(oflags & O_CREAT) && errno == ENOENT)
|
|
return 0;
|
|
|
|
if ((oflags & O_CREAT) && errno == EISDIR) {
|
|
if (remove_empty_directories(log_file)) {
|
|
return error("There are still logs under '%s'",
|
|
log_file);
|
|
}
|
|
logfd = open(log_file, oflags, 0666);
|
|
}
|
|
|
|
if (logfd < 0)
|
|
return error("Unable to append to %s: %s",
|
|
log_file, strerror(errno));
|
|
}
|
|
|
|
adjust_shared_perm(log_file);
|
|
|
|
msglen = 0;
|
|
if (msg) {
|
|
/* clean up the message and make sure it is a single line */
|
|
for ( ; *msg; msg++)
|
|
if (!isspace(*msg))
|
|
break;
|
|
if (*msg) {
|
|
const char *ep = strchr(msg, '\n');
|
|
if (ep)
|
|
msglen = ep - msg;
|
|
else
|
|
msglen = strlen(msg);
|
|
}
|
|
}
|
|
|
|
committer = git_committer_info(-1);
|
|
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 += sprintf(logrec + len - 1, "\t%.*s\n", msglen, msg) - 1;
|
|
written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1;
|
|
free(logrec);
|
|
close(logfd);
|
|
if (written != len)
|
|
return error("Unable to append to %s", log_file);
|
|
return 0;
|
|
}
|
|
|
|
int write_ref_sha1(struct ref_lock *lock,
|
|
const unsigned char *sha1, const char *logmsg)
|
|
{
|
|
static char term = '\n';
|
|
|
|
if (!lock)
|
|
return -1;
|
|
if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) {
|
|
unlock_ref(lock);
|
|
return 0;
|
|
}
|
|
if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 ||
|
|
write_in_full(lock->lock_fd, &term, 1) != 1
|
|
|| close(lock->lock_fd) < 0) {
|
|
error("Couldn't write %s", lock->lk->filename);
|
|
unlock_ref(lock);
|
|
return -1;
|
|
}
|
|
invalidate_cached_refs();
|
|
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("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_lock_file(lock->lk)) {
|
|
error("Couldn't set %s", lock->ref_name);
|
|
unlock_ref(lock);
|
|
return -1;
|
|
}
|
|
lock->lock_fd = -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 = xstrdup(git_path("%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);
|
|
close(fd);
|
|
if (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(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;
|
|
char *msg;
|
|
|
|
line += 82;
|
|
for (ep = line; ep < endp && *ep != '\n'; ep++)
|
|
;
|
|
msg = xmalloc(ep - line + 1);
|
|
memcpy(msg, line, ep - line);
|
|
msg[ep - line] = 0;
|
|
return msg;
|
|
}
|
|
|
|
int read_ref_at(const char *ref, 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", ref);
|
|
logfd = open(logfile, O_RDONLY, 0);
|
|
if (logfd < 0)
|
|
die("Unable to read log %s: %s", logfile, strerror(errno));
|
|
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)) {
|
|
fprintf(stderr,
|
|
"warning: Log %s has gap after %s.\n",
|
|
logfile, show_rfc2822_date(date, tz));
|
|
}
|
|
}
|
|
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)) {
|
|
fprintf(stderr,
|
|
"warning: Log %s unexpectedly ended on %s.\n",
|
|
logfile, show_rfc2822_date(date, tz));
|
|
}
|
|
}
|
|
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 (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_reflog_ent(const char *ref, each_reflog_ent_fn fn, void *cb_data)
|
|
{
|
|
const char *logfile;
|
|
FILE *logfp;
|
|
char buf[1024];
|
|
int ret = 0;
|
|
|
|
logfile = git_path("logs/%s", ref);
|
|
logfp = fopen(logfile, "r");
|
|
if (!logfp)
|
|
return -1;
|
|
while (fgets(buf, sizeof(buf), logfp)) {
|
|
unsigned char osha1[20], nsha1[20];
|
|
char *email_end, *message;
|
|
unsigned long timestamp;
|
|
int len, tz;
|
|
|
|
/* old SP new SP name <email> SP time TAB msg LF */
|
|
len = strlen(buf);
|
|
if (len < 83 || buf[len-1] != '\n' ||
|
|
get_sha1_hex(buf, osha1) || buf[40] != ' ' ||
|
|
get_sha1_hex(buf + 41, nsha1) || buf[81] != ' ' ||
|
|
!(email_end = strchr(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, buf+82, timestamp, tz, message, cb_data);
|
|
if (ret)
|
|
break;
|
|
}
|
|
fclose(logfp);
|
|
return ret;
|
|
}
|
|
|
|
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 (!resolve_ref(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);
|
|
}
|