builtin-prune.c

   1 #include "cache.h"
   2 #include "commit.h"
   3 #include "diff.h"
   4 #include "revision.h"
   5 #include "builtin.h"
   6 #include "reachable.h"
   7 #include "parse-options.h"
   8
   9 static const char * const prune_usage[] = {
  10         "git prune [-n] [--expire <time>] [--] [<head>...]",
  11         NULL
  12 };
  13 static int show_only;
  14 static unsigned long expire;
  15
  16 static int prune_object(char *path, const char *filename, const unsigned char *sha1)
  17 {
  18         const char *fullpath = mkpath("%s/%s", path, filename);
  19         if (expire) {
  20                 struct stat st;
  21                 if (lstat(fullpath, &st))
  22                         return error("Could not stat '%s'", fullpath);
  23                 if (st.st_mtime > expire)
  24                         return 0;
  25         }
  26         if (show_only) {
  27                 enum object_type type = sha1_object_info(sha1, NULL);
  28                 printf("%s %s\n", sha1_to_hex(sha1),
  29                        (type > 0) ? typename(type) : "unknown");
  30         } else
  31                 unlink(fullpath);
  32         return 0;
  33 }
  34
  35 static int prune_dir(int i, char *path)
  36 {
  37         DIR *dir = opendir(path);
  38         struct dirent *de;
  39
  40         if (!dir)
  41                 return 0;
  42
  43         while ((de = readdir(dir)) != NULL) {
  44                 char name[100];
  45                 unsigned char sha1[20];
  46                 int len = strlen(de->d_name);
  47
  48                 switch (len) {
  49                 case 2:
  50                         if (de->d_name[1] != '.')
  51                                 break;
  52                 case 1:
  53                         if (de->d_name[0] != '.')
  54                                 break;
  55                         continue;
  56                 case 38:
  57                         sprintf(name, "%02x", i);
  58                         memcpy(name+2, de->d_name, len+1);
  59                         if (get_sha1_hex(name, sha1) < 0)
  60                                 break;
  61
  62                         /*
  63                          * Do we know about this object?
  64                          * It must have been reachable
  65                          */
  66                         if (lookup_object(sha1))
  67                                 continue;
  68
  69                         prune_object(path, de->d_name, sha1);
  70                         continue;
  71                 }
  72                 fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
  73         }
  74         if (!show_only)
  75                 rmdir(path);
  76         closedir(dir);
  77         return 0;
  78 }
  79
  80 static void prune_object_dir(const char *path)
  81 {
  82         int i;
  83         for (i = 0; i < 256; i++) {
  84                 static char dir[4096];
  85                 sprintf(dir, "%s/%02x", path, i);
  86                 prune_dir(i, dir);
  87         }
  88 }
  89
  90 /*
  91  * Write errors (particularly out of space) can result in
  92  * failed temporary packs (and more rarely indexes and other
  93  * files begining with "tmp_") accumulating in the
  94  * object directory.
  95  */
  96 static void remove_temporary_files(void)
  97 {
  98         DIR *dir;
  99         struct dirent *de;
 100         char* dirname=get_object_directory();
 101
 102         dir = opendir(dirname);
 103         if (!dir) {
 104                 fprintf(stderr, "Unable to open object directory %s\n",
 105                         dirname);
 106                 return;
 107         }
 108         while ((de = readdir(dir)) != NULL) {
 109                 if (!prefixcmp(de->d_name, "tmp_")) {
 110                         char name[PATH_MAX];
 111                         int c = snprintf(name, PATH_MAX, "%s/%s",
 112                                          dirname, de->d_name);
 113                         if (c < 0 || c >= PATH_MAX)
 114                                 continue;
 115                         if (expire) {
 116                                 struct stat st;
 117                                 if (stat(name, &st) != 0 || st.st_mtime >= expire)
 118                                         continue;
 119                         }
 120                         printf("Removing stale temporary file %s\n", name);
 121                         if (!show_only)
 122                                 unlink(name);
 123                 }
 124         }
 125         closedir(dir);
 126 }
 127
 128 int cmd_prune(int argc, const char **argv, const char *prefix)
 129 {
 130         struct rev_info revs;
 131         const struct option options[] = {
 132                 OPT_BOOLEAN('n', NULL, &show_only,
 133                             "do not remove, show only"),
 134                 OPT_DATE(0, "expire", &expire,
 135                          "expire objects older than <time>"),
 136                 OPT_END()
 137         };
 138
 139         save_commit_buffer = 0;
 140         init_revisions(&revs, prefix);
 141
 142         argc = parse_options(argc, argv, options, prune_usage, 0);
 143         while (argc--) {
 144                 unsigned char sha1[20];
 145                 const char *name = *argv++;
 146
 147                 if (!get_sha1(name, sha1)) {
 148                         struct object *object = parse_object(sha1);
 149                         if (!object)
 150                                 die("bad object: %s", name);
 151                         add_pending_object(&revs, object, "");
 152                 }
 153                 else
 154                         die("unrecognized argument: %s", name);
 155         }
 156         mark_reachable_objects(&revs, 1);
 157         prune_object_dir(get_object_directory());
 158
 159         prune_packed_objects(show_only);
 160         remove_temporary_files();
 161         return 0;
 162 }