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![Shawn Pearce](/assets/img/avatar_default.png)
Like xmalloc and xrealloc xstrdup dies with a useful message if the native strdup() implementation returns NULL rather than a valid pointer. I just tried to use xstrdup in new code and found it to be missing. However I expected it to be present as xmalloc and xrealloc are already commonly used throughout the code. [jc: removed the part that deals with last_XXX, which I am finding more and more dubious these days.] Signed-off-by: Shawn O. Pearce <spearce@spearce.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
614 lines
14 KiB
C
614 lines
14 KiB
C
#include <sys/types.h>
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#include <dirent.h>
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#include "cache.h"
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#include "commit.h"
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#include "tree.h"
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#include "blob.h"
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#include "tag.h"
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#include "refs.h"
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#include "pack.h"
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#include "cache-tree.h"
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#include "tree-walk.h"
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#define REACHABLE 0x0001
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#define SEEN 0x0002
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static int show_root;
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static int show_tags;
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static int show_unreachable;
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static int check_full;
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static int check_strict;
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static int keep_cache_objects;
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static unsigned char head_sha1[20];
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#ifdef NO_D_INO_IN_DIRENT
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#define SORT_DIRENT 0
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#define DIRENT_SORT_HINT(de) 0
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#else
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#define SORT_DIRENT 1
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#define DIRENT_SORT_HINT(de) ((de)->d_ino)
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#endif
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static void objreport(struct object *obj, const char *severity,
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const char *err, va_list params)
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{
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fprintf(stderr, "%s in %s %s: ",
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severity, typename(obj->type), sha1_to_hex(obj->sha1));
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vfprintf(stderr, err, params);
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fputs("\n", stderr);
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}
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static int objerror(struct object *obj, const char *err, ...)
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{
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va_list params;
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va_start(params, err);
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objreport(obj, "error", err, params);
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va_end(params);
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return -1;
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}
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static int objwarning(struct object *obj, const char *err, ...)
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{
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va_list params;
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va_start(params, err);
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objreport(obj, "warning", err, params);
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va_end(params);
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return -1;
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}
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static void check_connectivity(void)
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{
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int i, max;
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/* Look up all the requirements, warn about missing objects.. */
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max = get_max_object_index();
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for (i = 0; i < max; i++) {
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const struct object_refs *refs;
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struct object *obj = get_indexed_object(i);
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if (!obj)
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continue;
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if (!obj->parsed) {
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if (has_sha1_file(obj->sha1))
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; /* it is in pack */
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else
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printf("missing %s %s\n",
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typename(obj->type), sha1_to_hex(obj->sha1));
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continue;
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}
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refs = lookup_object_refs(obj);
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if (refs) {
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unsigned j;
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for (j = 0; j < refs->count; j++) {
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struct object *ref = refs->ref[j];
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if (ref->parsed ||
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(has_sha1_file(ref->sha1)))
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continue;
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printf("broken link from %7s %s\n",
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typename(obj->type), sha1_to_hex(obj->sha1));
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printf(" to %7s %s\n",
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typename(ref->type), sha1_to_hex(ref->sha1));
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}
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}
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if (show_unreachable && !(obj->flags & REACHABLE)) {
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printf("unreachable %s %s\n",
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typename(obj->type), sha1_to_hex(obj->sha1));
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continue;
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}
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if (!obj->used) {
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printf("dangling %s %s\n", typename(obj->type),
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sha1_to_hex(obj->sha1));
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}
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}
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}
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/*
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* The entries in a tree are ordered in the _path_ order,
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* which means that a directory entry is ordered by adding
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* a slash to the end of it.
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*
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* So a directory called "a" is ordered _after_ a file
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* called "a.c", because "a/" sorts after "a.c".
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*/
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#define TREE_UNORDERED (-1)
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#define TREE_HAS_DUPS (-2)
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static int verify_ordered(unsigned mode1, const char *name1, unsigned mode2, const char *name2)
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{
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int len1 = strlen(name1);
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int len2 = strlen(name2);
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int len = len1 < len2 ? len1 : len2;
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unsigned char c1, c2;
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int cmp;
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cmp = memcmp(name1, name2, len);
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if (cmp < 0)
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return 0;
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if (cmp > 0)
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return TREE_UNORDERED;
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/*
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* Ok, the first <len> characters are the same.
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* Now we need to order the next one, but turn
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* a '\0' into a '/' for a directory entry.
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*/
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c1 = name1[len];
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c2 = name2[len];
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if (!c1 && !c2)
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/*
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* git-write-tree used to write out a nonsense tree that has
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* entries with the same name, one blob and one tree. Make
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* sure we do not have duplicate entries.
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*/
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return TREE_HAS_DUPS;
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if (!c1 && S_ISDIR(mode1))
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c1 = '/';
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if (!c2 && S_ISDIR(mode2))
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c2 = '/';
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return c1 < c2 ? 0 : TREE_UNORDERED;
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}
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static int fsck_tree(struct tree *item)
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{
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int retval;
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int has_full_path = 0;
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int has_zero_pad = 0;
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int has_bad_modes = 0;
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int has_dup_entries = 0;
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int not_properly_sorted = 0;
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struct tree_desc desc;
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unsigned o_mode;
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const char *o_name;
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const unsigned char *o_sha1;
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desc.buf = item->buffer;
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desc.size = item->size;
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o_mode = 0;
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o_name = NULL;
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o_sha1 = NULL;
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while (desc.size) {
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unsigned mode;
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const char *name;
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const unsigned char *sha1;
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sha1 = tree_entry_extract(&desc, &name, &mode);
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if (strchr(name, '/'))
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has_full_path = 1;
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has_zero_pad |= *(char *)desc.buf == '0';
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update_tree_entry(&desc);
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switch (mode) {
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/*
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* Standard modes..
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*/
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case S_IFREG | 0755:
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case S_IFREG | 0644:
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case S_IFLNK:
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case S_IFDIR:
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break;
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/*
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* This is nonstandard, but we had a few of these
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* early on when we honored the full set of mode
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* bits..
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*/
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case S_IFREG | 0664:
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if (!check_strict)
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break;
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default:
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has_bad_modes = 1;
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}
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if (o_name) {
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switch (verify_ordered(o_mode, o_name, mode, name)) {
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case TREE_UNORDERED:
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not_properly_sorted = 1;
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break;
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case TREE_HAS_DUPS:
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has_dup_entries = 1;
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break;
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default:
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break;
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}
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}
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o_mode = mode;
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o_name = name;
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o_sha1 = sha1;
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}
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free(item->buffer);
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item->buffer = NULL;
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retval = 0;
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if (has_full_path) {
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objwarning(&item->object, "contains full pathnames");
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}
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if (has_zero_pad) {
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objwarning(&item->object, "contains zero-padded file modes");
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}
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if (has_bad_modes) {
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objwarning(&item->object, "contains bad file modes");
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}
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if (has_dup_entries) {
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retval = objerror(&item->object, "contains duplicate file entries");
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}
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if (not_properly_sorted) {
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retval = objerror(&item->object, "not properly sorted");
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}
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return retval;
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}
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static int fsck_commit(struct commit *commit)
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{
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char *buffer = commit->buffer;
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unsigned char tree_sha1[20], sha1[20];
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if (memcmp(buffer, "tree ", 5))
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return objerror(&commit->object, "invalid format - expected 'tree' line");
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if (get_sha1_hex(buffer+5, tree_sha1) || buffer[45] != '\n')
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return objerror(&commit->object, "invalid 'tree' line format - bad sha1");
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buffer += 46;
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while (!memcmp(buffer, "parent ", 7)) {
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if (get_sha1_hex(buffer+7, sha1) || buffer[47] != '\n')
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return objerror(&commit->object, "invalid 'parent' line format - bad sha1");
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buffer += 48;
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}
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if (memcmp(buffer, "author ", 7))
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return objerror(&commit->object, "invalid format - expected 'author' line");
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free(commit->buffer);
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commit->buffer = NULL;
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if (!commit->tree)
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return objerror(&commit->object, "could not load commit's tree %s", tree_sha1);
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if (!commit->parents && show_root)
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printf("root %s\n", sha1_to_hex(commit->object.sha1));
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if (!commit->date)
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printf("bad commit date in %s\n",
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sha1_to_hex(commit->object.sha1));
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return 0;
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}
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static int fsck_tag(struct tag *tag)
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{
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struct object *tagged = tag->tagged;
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if (!tagged) {
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return objerror(&tag->object, "could not load tagged object");
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}
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if (!show_tags)
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return 0;
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printf("tagged %s %s", typename(tagged->type), sha1_to_hex(tagged->sha1));
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printf(" (%s) in %s\n", tag->tag, sha1_to_hex(tag->object.sha1));
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return 0;
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}
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static int fsck_sha1(unsigned char *sha1)
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{
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struct object *obj = parse_object(sha1);
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if (!obj)
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return error("%s: object not found", sha1_to_hex(sha1));
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if (obj->flags & SEEN)
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return 0;
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obj->flags |= SEEN;
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if (obj->type == OBJ_BLOB)
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return 0;
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if (obj->type == OBJ_TREE)
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return fsck_tree((struct tree *) obj);
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if (obj->type == OBJ_COMMIT)
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return fsck_commit((struct commit *) obj);
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if (obj->type == OBJ_TAG)
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return fsck_tag((struct tag *) obj);
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/* By now, parse_object() would've returned NULL instead. */
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return objerror(obj, "unknown type '%d' (internal fsck error)", obj->type);
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}
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/*
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* This is the sorting chunk size: make it reasonably
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* big so that we can sort well..
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*/
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#define MAX_SHA1_ENTRIES (1024)
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struct sha1_entry {
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unsigned long ino;
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unsigned char sha1[20];
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};
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static struct {
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unsigned long nr;
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struct sha1_entry *entry[MAX_SHA1_ENTRIES];
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} sha1_list;
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static int ino_compare(const void *_a, const void *_b)
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{
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const struct sha1_entry *a = _a, *b = _b;
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unsigned long ino1 = a->ino, ino2 = b->ino;
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return ino1 < ino2 ? -1 : ino1 > ino2 ? 1 : 0;
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}
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static void fsck_sha1_list(void)
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{
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int i, nr = sha1_list.nr;
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if (SORT_DIRENT)
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qsort(sha1_list.entry, nr,
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sizeof(struct sha1_entry *), ino_compare);
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for (i = 0; i < nr; i++) {
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struct sha1_entry *entry = sha1_list.entry[i];
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unsigned char *sha1 = entry->sha1;
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sha1_list.entry[i] = NULL;
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fsck_sha1(sha1);
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free(entry);
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}
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sha1_list.nr = 0;
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}
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static void add_sha1_list(unsigned char *sha1, unsigned long ino)
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{
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struct sha1_entry *entry = xmalloc(sizeof(*entry));
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int nr;
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entry->ino = ino;
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hashcpy(entry->sha1, sha1);
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nr = sha1_list.nr;
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if (nr == MAX_SHA1_ENTRIES) {
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fsck_sha1_list();
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nr = 0;
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}
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sha1_list.entry[nr] = entry;
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sha1_list.nr = ++nr;
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}
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static void fsck_dir(int i, char *path)
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{
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DIR *dir = opendir(path);
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struct dirent *de;
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if (!dir)
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return;
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while ((de = readdir(dir)) != NULL) {
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char name[100];
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unsigned char sha1[20];
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int len = strlen(de->d_name);
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switch (len) {
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case 2:
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if (de->d_name[1] != '.')
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break;
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case 1:
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if (de->d_name[0] != '.')
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break;
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continue;
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case 38:
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sprintf(name, "%02x", i);
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memcpy(name+2, de->d_name, len+1);
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if (get_sha1_hex(name, sha1) < 0)
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break;
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add_sha1_list(sha1, DIRENT_SORT_HINT(de));
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continue;
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}
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fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
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}
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closedir(dir);
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}
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static int default_refs;
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static int fsck_handle_ref(const char *refname, const unsigned char *sha1)
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{
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struct object *obj;
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obj = lookup_object(sha1);
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if (!obj) {
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if (has_sha1_file(sha1)) {
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default_refs++;
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return 0; /* it is in a pack */
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}
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error("%s: invalid sha1 pointer %s", refname, sha1_to_hex(sha1));
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/* We'll continue with the rest despite the error.. */
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return 0;
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}
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default_refs++;
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obj->used = 1;
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mark_reachable(obj, REACHABLE);
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return 0;
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}
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static void get_default_heads(void)
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{
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for_each_ref(fsck_handle_ref);
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/*
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* Not having any default heads isn't really fatal, but
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* it does mean that "--unreachable" no longer makes any
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* sense (since in this case everything will obviously
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* be unreachable by definition.
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*
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* Showing dangling objects is valid, though (as those
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* dangling objects are likely lost heads).
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*
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* So we just print a warning about it, and clear the
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* "show_unreachable" flag.
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*/
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if (!default_refs) {
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error("No default references");
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show_unreachable = 0;
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}
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}
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static void fsck_object_dir(const char *path)
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{
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int i;
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for (i = 0; i < 256; i++) {
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static char dir[4096];
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sprintf(dir, "%s/%02x", path, i);
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fsck_dir(i, dir);
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}
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fsck_sha1_list();
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}
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static int fsck_head_link(void)
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{
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unsigned char sha1[20];
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const char *git_HEAD = xstrdup(git_path("HEAD"));
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const char *git_refs_heads_master = resolve_ref(git_HEAD, sha1, 1);
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int pfxlen = strlen(git_HEAD) - 4; /* strip .../.git/ part */
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if (!git_refs_heads_master)
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return error("HEAD is not a symbolic ref");
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if (strncmp(git_refs_heads_master + pfxlen, "refs/heads/", 11))
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return error("HEAD points to something strange (%s)",
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git_refs_heads_master + pfxlen);
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if (is_null_sha1(sha1))
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return error("HEAD: not a valid git pointer");
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return 0;
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}
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static int fsck_cache_tree(struct cache_tree *it)
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{
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int i;
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int err = 0;
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if (0 <= it->entry_count) {
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struct object *obj = parse_object(it->sha1);
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if (!obj) {
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error("%s: invalid sha1 pointer in cache-tree",
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sha1_to_hex(it->sha1));
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return 1;
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}
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mark_reachable(obj, REACHABLE);
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obj->used = 1;
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if (obj->type != OBJ_TREE)
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err |= objerror(obj, "non-tree in cache-tree");
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}
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for (i = 0; i < it->subtree_nr; i++)
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err |= fsck_cache_tree(it->down[i]->cache_tree);
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return err;
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}
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int main(int argc, char **argv)
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{
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int i, heads;
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track_object_refs = 1;
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setup_git_directory();
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for (i = 1; i < argc; i++) {
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const char *arg = argv[i];
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if (!strcmp(arg, "--unreachable")) {
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show_unreachable = 1;
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continue;
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}
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if (!strcmp(arg, "--tags")) {
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show_tags = 1;
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continue;
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}
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if (!strcmp(arg, "--root")) {
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show_root = 1;
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continue;
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}
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if (!strcmp(arg, "--cache")) {
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keep_cache_objects = 1;
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continue;
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}
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if (!strcmp(arg, "--full")) {
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check_full = 1;
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continue;
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}
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if (!strcmp(arg, "--strict")) {
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check_strict = 1;
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continue;
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}
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if (*arg == '-')
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usage("git-fsck-objects [--tags] [--root] [[--unreachable] [--cache] [--full] [--strict] <head-sha1>*]");
|
|
}
|
|
|
|
fsck_head_link();
|
|
fsck_object_dir(get_object_directory());
|
|
if (check_full) {
|
|
struct alternate_object_database *alt;
|
|
struct packed_git *p;
|
|
prepare_alt_odb();
|
|
for (alt = alt_odb_list; alt; alt = alt->next) {
|
|
char namebuf[PATH_MAX];
|
|
int namelen = alt->name - alt->base;
|
|
memcpy(namebuf, alt->base, namelen);
|
|
namebuf[namelen - 1] = 0;
|
|
fsck_object_dir(namebuf);
|
|
}
|
|
prepare_packed_git();
|
|
for (p = packed_git; p; p = p->next)
|
|
/* verify gives error messages itself */
|
|
verify_pack(p, 0);
|
|
|
|
for (p = packed_git; p; p = p->next) {
|
|
int num = num_packed_objects(p);
|
|
for (i = 0; i < num; i++) {
|
|
unsigned char sha1[20];
|
|
nth_packed_object_sha1(p, i, sha1);
|
|
fsck_sha1(sha1);
|
|
}
|
|
}
|
|
}
|
|
|
|
heads = 0;
|
|
for (i = 1; i < argc; i++) {
|
|
const char *arg = argv[i];
|
|
|
|
if (*arg == '-')
|
|
continue;
|
|
|
|
if (!get_sha1(arg, head_sha1)) {
|
|
struct object *obj = lookup_object(head_sha1);
|
|
|
|
/* Error is printed by lookup_object(). */
|
|
if (!obj)
|
|
continue;
|
|
|
|
obj->used = 1;
|
|
mark_reachable(obj, REACHABLE);
|
|
heads++;
|
|
continue;
|
|
}
|
|
error("invalid parameter: expected sha1, got '%s'", arg);
|
|
}
|
|
|
|
/*
|
|
* If we've not been given any explicit head information, do the
|
|
* default ones from .git/refs. We also consider the index file
|
|
* in this case (ie this implies --cache).
|
|
*/
|
|
if (!heads) {
|
|
get_default_heads();
|
|
keep_cache_objects = 1;
|
|
}
|
|
|
|
if (keep_cache_objects) {
|
|
int i;
|
|
read_cache();
|
|
for (i = 0; i < active_nr; i++) {
|
|
struct blob *blob = lookup_blob(active_cache[i]->sha1);
|
|
struct object *obj;
|
|
if (!blob)
|
|
continue;
|
|
obj = &blob->object;
|
|
obj->used = 1;
|
|
mark_reachable(obj, REACHABLE);
|
|
}
|
|
if (active_cache_tree)
|
|
fsck_cache_tree(active_cache_tree);
|
|
}
|
|
|
|
check_connectivity();
|
|
return 0;
|
|
}
|