show-diff.c

   1 #include "cache.h"
   2
   3 #define MTIME_CHANGED   0x0001
   4 #define CTIME_CHANGED   0x0002
   5 #define OWNER_CHANGED   0x0004
   6 #define MODE_CHANGED    0x0008
   7 #define INODE_CHANGED   0x0010
   8 #define DATA_CHANGED    0x0020
   9
  10 static int match_stat(struct cache_entry *ce, struct stat *st)
  11 {
  12         unsigned int changed = 0;
  13
  14         if (ce->mtime.sec  != (unsigned int)st->st_mtim.tv_sec ||
  15             ce->mtime.nsec != (unsigned int)st->st_mtim.tv_nsec)
  16                 changed |= MTIME_CHANGED;
  17         if (ce->ctime.sec  != (unsigned int)st->st_ctim.tv_sec ||
  18             ce->ctime.nsec != (unsigned int)st->st_ctim.tv_nsec)
  19                 changed |= CTIME_CHANGED;
  20         if (ce->st_uid != (unsigned int)st->st_uid ||
  21             ce->st_gid != (unsigned int)st->st_gid)
  22                 changed |= OWNER_CHANGED;
  23         if (ce->st_mode != (unsigned int)st->st_mode)
  24                 changed |= MODE_CHANGED;
  25         if (ce->st_dev != (unsigned int)st->st_dev ||
  26             ce->st_ino != (unsigned int)st->st_ino)
  27                 changed |= INODE_CHANGED;
  28         if (ce->st_size != (unsigned int)st->st_size)
  29                 changed |= DATA_CHANGED;
  30         return changed;
  31 }
  32
  33 static void show_differences(struct cache_entry *ce, struct stat *cur,
  34         void *old_contents, unsigned long long old_size)
  35 {
  36         static char cmd[1000];
  37         FILE *f;
  38
  39         snprintf(cmd, sizeof(cmd), "diff -u - %s", ce->name);
  40         f = popen(cmd, "w");
  41         fwrite(old_contents, old_size, 1, f);
  42         pclose(f);
  43 }
  44
  45 int main(int argc, char **argv)
  46 {
  47         int entries = read_cache();
  48         int i;
  49
  50         if (entries < 0) {
  51                 perror("read_cache");
  52                 exit(1);
  53         }
  54         for (i = 0; i < entries; i++) {
  55                 struct stat st;
  56                 struct cache_entry *ce = active_cache[i];
  57                 int n, changed;
  58                 unsigned int mode;
  59                 unsigned long size;
  60                 char type[20];
  61                 void *new;
  62
  63                 if (stat(ce->name, &st) < 0) {
  64                         printf("%s: %s\n", ce->name, strerror(errno));
  65                         continue;
  66                 }
  67                 changed = match_stat(ce, &st);
  68                 if (!changed) {
  69                         printf("%s: ok\n", ce->name);
  70                         continue;
  71                 }
  72                 printf("%.*s:  ", ce->namelen, ce->name);
  73                 for (n = 0; n < 20; n++)
  74                         printf("%02x", ce->sha1[n]);
  75                 printf("\n");
  76                 new = read_sha1_file(ce->sha1, type, &size);
  77                 show_differences(ce, &st, new, size);
  78                 free(new);
  79         }
  80         return 0;
  81 }