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 #include "progress.h"
   9 #include "dir.h"
  10
  11 static const char * const prune_usage[] = {
  12         N_("git prune [-n] [-v] [--expire <time>] [--] [<head>...]"),
  13         NULL
  14 };
  15 static int show_only;
  16 static int verbose;
  17 static unsigned long expire;
  18 static int show_progress = -1;
  19
  20 static int prune_tmp_object(const char *path, const char *filename)
  21 {
  22         const char *fullpath = mkpath("%s/%s", path, filename);
  23         struct stat st;
  24         if (lstat(fullpath, &st))
  25                 return error("Could not stat '%s'", fullpath);
  26         if (st.st_mtime > expire)
  27                 return 0;
  28         if (show_only || verbose)
  29                 printf("Removing stale temporary file %s\n", fullpath);
  30         if (!show_only)
  31                 unlink_or_warn(fullpath);
  32         return 0;
  33 }
  34
  35 static int prune_object(char *path, const char *filename, const unsigned char *sha1)
  36 {
  37         const char *fullpath = mkpath("%s/%s", path, filename);
  38         struct stat st;
  39         if (lstat(fullpath, &st))
  40                 return error("Could not stat '%s'", fullpath);
  41         if (st.st_mtime > expire)
  42                 return 0;
  43         if (show_only || verbose) {
  44                 enum object_type type = sha1_object_info(sha1, NULL);
  45                 printf("%s %s\n", sha1_to_hex(sha1),
  46                        (type > 0) ? typename(type) : "unknown");
  47         }
  48         if (!show_only)
  49                 unlink_or_warn(fullpath);
  50         return 0;
  51 }
  52
  53 static int prune_dir(int i, char *path)
  54 {
  55         DIR *dir = opendir(path);
  56         struct dirent *de;
  57
  58         if (!dir)
  59                 return 0;
  60
  61         while ((de = readdir(dir)) != NULL) {
  62                 char name[100];
  63                 unsigned char sha1[20];
  64
  65                 if (is_dot_or_dotdot(de->d_name))
  66                         continue;
  67                 if (strlen(de->d_name) == 38) {
  68                         sprintf(name, "%02x", i);
  69                         memcpy(name+2, de->d_name, 39);
  70                         if (get_sha1_hex(name, sha1) < 0)
  71                                 break;
  72
  73                         /*
  74                          * Do we know about this object?
  75                          * It must have been reachable
  76                          */
  77                         if (lookup_object(sha1))
  78                                 continue;
  79
  80                         prune_object(path, de->d_name, sha1);
  81                         continue;
  82                 }
  83                 if (!prefixcmp(de->d_name, "tmp_obj_")) {
  84                         prune_tmp_object(path, de->d_name);
  85                         continue;
  86                 }
  87                 fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
  88         }
  89         closedir(dir);
  90         if (!show_only)
  91                 rmdir(path);
  92         return 0;
  93 }
  94
  95 static void prune_object_dir(const char *path)
  96 {
  97         int i;
  98         for (i = 0; i < 256; i++) {
  99                 static char dir[4096];
 100                 sprintf(dir, "%s/%02x", path, i);
 101                 prune_dir(i, dir);
 102         }
 103 }
 104
 105 /*
 106  * Write errors (particularly out of space) can result in
 107  * failed temporary packs (and more rarely indexes and other
 108  * files beginning with "tmp_") accumulating in the object
 109  * and the pack directories.
 110  */
 111 static void remove_temporary_files(const char *path)
 112 {
 113         DIR *dir;
 114         struct dirent *de;
 115
 116         dir = opendir(path);
 117         if (!dir) {
 118                 fprintf(stderr, "Unable to open directory %s\n", path);
 119                 return;
 120         }
 121         while ((de = readdir(dir)) != NULL)
 122                 if (!prefixcmp(de->d_name, "tmp_"))
 123                         prune_tmp_object(path, de->d_name);
 124         closedir(dir);
 125 }
 126
 127 int cmd_prune(int argc, const char **argv, const char *prefix)
 128 {
 129         struct rev_info revs;
 130         struct progress *progress = NULL;
 131         const struct option options[] = {
 132                 OPT__DRY_RUN(&show_only, N_("do not remove, show only")),
 133                 OPT__VERBOSE(&verbose, N_("report pruned objects")),
 134                 OPT_BOOL(0, "progress", &show_progress, N_("show progress")),
 135                 OPT_EXPIRY_DATE(0, "expire", &expire,
 136                                 N_("expire objects older than <time>")),
 137                 OPT_END()
 138         };
 139         char *s;
 140
 141         expire = ULONG_MAX;
 142         save_commit_buffer = 0;
 143         read_replace_refs = 0;
 144         init_revisions(&revs, prefix);
 145
 146         argc = parse_options(argc, argv, prefix, options, prune_usage, 0);
 147         while (argc--) {
 148                 unsigned char sha1[20];
 149                 const char *name = *argv++;
 150
 151                 if (!get_sha1(name, sha1)) {
 152                         struct object *object = parse_object_or_die(sha1, name);
 153                         add_pending_object(&revs, object, "");
 154                 }
 155                 else
 156                         die("unrecognized argument: %s", name);
 157         }
 158
 159         if (show_progress == -1)
 160                 show_progress = isatty(2);
 161         if (show_progress)
 162                 progress = start_progress_delay("Checking connectivity", 0, 0, 2);
 163
 164         mark_reachable_objects(&revs, 1, progress);
 165         stop_progress(&progress);
 166         prune_object_dir(get_object_directory());
 167
 168         prune_packed_objects(show_only ? PRUNE_PACKED_DRY_RUN : 0);
 169         remove_temporary_files(get_object_directory());
 170         s = mkpathdup("%s/pack", get_object_directory());
 171         remove_temporary_files(s);
 172         free(s);
 173         return 0;
 174 }