show-diff.c

   1 /*
   2  * GIT - The information manager from hell
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  */
   6 #include "cache.h"
   7
   8 #define MTIME_CHANGED   0x0001
   9 #define CTIME_CHANGED   0x0002
  10 #define OWNER_CHANGED   0x0004
  11 #define MODE_CHANGED    0x0008
  12 #define INODE_CHANGED   0x0010
  13 #define DATA_CHANGED    0x0020
  14
  15 static int match_stat(struct cache_entry *ce, struct stat *st)
  16 {
  17         unsigned int changed = 0;
  18
  19         if (ce->mtime.sec  != (unsigned int)st->st_mtim.tv_sec ||
  20             ce->mtime.nsec != (unsigned int)st->st_mtim.tv_nsec)
  21                 changed |= MTIME_CHANGED;
  22         if (ce->ctime.sec  != (unsigned int)st->st_ctim.tv_sec ||
  23             ce->ctime.nsec != (unsigned int)st->st_ctim.tv_nsec)
  24                 changed |= CTIME_CHANGED;
  25         if (ce->st_uid != (unsigned int)st->st_uid ||
  26             ce->st_gid != (unsigned int)st->st_gid)
  27                 changed |= OWNER_CHANGED;
  28         if (ce->st_mode != (unsigned int)st->st_mode)
  29                 changed |= MODE_CHANGED;
  30         if (ce->st_dev != (unsigned int)st->st_dev ||
  31             ce->st_ino != (unsigned int)st->st_ino)
  32                 changed |= INODE_CHANGED;
  33         if (ce->st_size != (unsigned int)st->st_size)
  34                 changed |= DATA_CHANGED;
  35         return changed;
  36 }
  37
  38 static void show_differences(struct cache_entry *ce, struct stat *cur,
  39         void *old_contents, unsigned long long old_size)
  40 {
  41         static char cmd[1000];
  42         FILE *f;
  43
  44         snprintf(cmd, sizeof(cmd), "diff -u - %s", ce->name);
  45         f = popen(cmd, "w");
  46         fwrite(old_contents, old_size, 1, f);
  47         pclose(f);
  48 }
  49
  50 int main(int argc, char **argv)
  51 {
  52         int entries = read_cache();
  53         int i;
  54
  55         if (entries < 0) {
  56                 perror("read_cache");
  57                 exit(1);
  58         }
  59         for (i = 0; i < entries; i++) {
  60                 struct stat st;
  61                 struct cache_entry *ce = active_cache[i];
  62                 int n, changed;
  63                 unsigned long size;
  64                 char type[20];
  65                 void *new;
  66
  67                 if (stat(ce->name, &st) < 0) {
  68                         printf("%s: %s\n", ce->name, strerror(errno));
  69                         continue;
  70                 }
  71                 changed = match_stat(ce, &st);
  72                 if (!changed) {
  73                         printf("%s: ok\n", ce->name);
  74                         continue;
  75                 }
  76                 printf("%.*s:  ", ce->namelen, ce->name);
  77                 for (n = 0; n < 20; n++)
  78                         printf("%02x", ce->sha1[n]);
  79                 printf("\n");
  80                 new = read_sha1_file(ce->sha1, type, &size);
  81                 show_differences(ce, &st, new, size);
  82                 free(new);
  83         }
  84         return 0;
  85 }