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Description: Git source code
Homepage: http://git.or.cz
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git-source / builtin-prune.c
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#include "cache.h"
#include "commit.h"
#include "diff.h"
#include "revision.h"
#include "builtin.h"
#include "reachable.h"
 
static const char prune_usage[] = "git-prune [-n]";
static int show_only;
 
static int prune_object(char *path, const char *filename, const unsigned char *sha1)
{
  if (show_only) {
    enum object_type type = sha1_object_info(sha1, NULL);
    printf("%s %s\n", sha1_to_hex(sha1),
           (type > 0) ? typename(type) : "unknown");
  } else
    unlink(mkpath("%s/%s", path, filename));
  return 0;
}
 
static int prune_dir(int i, char *path)
{
  DIR *dir = opendir(path);
  struct dirent *de;
 
  if (!dir)
    return 0;
 
  while ((de = readdir(dir)) != NULL) {
    char name[100];
    unsigned char sha1[20];
    int len = strlen(de->d_name);
 
    switch (len) {
    case 2:
      if (de->d_name[1] != '.')
        break;
    case 1:
      if (de->d_name[0] != '.')
        break;
      continue;
    case 38:
      sprintf(name, "%02x", i);
      memcpy(name+2, de->d_name, len+1);
      if (get_sha1_hex(name, sha1) < 0)
        break;
 
      /*
       * Do we know about this object?
       * It must have been reachable
       */
      if (lookup_object(sha1))
        continue;
 
      prune_object(path, de->d_name, sha1);
      continue;
    }
    fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
  }
  if (!show_only)
    rmdir(path);
  closedir(dir);
  return 0;
}
 
static void prune_object_dir(const char *path)
{
  int i;
  for (i = 0; i < 256; i++) {
    static char dir[4096];
    sprintf(dir, "%s/%02x", path, i);
    prune_dir(i, dir);
  }
}
 
int cmd_prune(int argc, const char **argv, const char *prefix)
{
  int i;
  struct rev_info revs;
 
  for (i = 1; i < argc; i++) {
    const char *arg = argv[i];
    if (!strcmp(arg, "-n")) {
      show_only = 1;
      continue;
    }
    usage(prune_usage);
  }
 
  save_commit_buffer = 0;
  init_revisions(&revs, prefix);
  mark_reachable_objects(&revs, 1);
 
  prune_object_dir(get_object_directory());
 
  sync();
  prune_packed_objects(show_only);
  return 0;
}