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 "object-store.h"
  10
  11 static const char * const prune_usage[] = {
  12         N_("git prune [-n] [-v] [--progress] [--expire <time>] [--] [<head>...]"),
  13         NULL
  14 };
  15 static int show_only;
  16 static int verbose;
  17 static timestamp_t expire;
  18 static int show_progress = -1;
  19
  20 static int prune_tmp_file(const char *fullpath)
  21 {
  22         struct stat st;
  23         if (lstat(fullpath, &st))
  24                 return error("Could not stat '%s'", fullpath);
  25         if (st.st_mtime > expire)
  26                 return 0;
  27         if (show_only || verbose)
  28                 printf("Removing stale temporary file %s\n", fullpath);
  29         if (!show_only)
  30                 unlink_or_warn(fullpath);
  31         return 0;
  32 }
  33
  34 static void perform_reachability_traversal(struct rev_info *revs)
  35 {
  36         static int initialized;
  37         struct progress *progress = NULL;
  38
  39         if (initialized)
  40                 return;
  41
  42         if (show_progress)
  43                 progress = start_delayed_progress(_("Checking connectivity"), 0);
  44         mark_reachable_objects(revs, 1, expire, progress);
  45         stop_progress(&progress);
  46         initialized = 1;
  47 }
  48
  49 static int is_object_reachable(const struct object_id *oid,
  50                                struct rev_info *revs)
  51 {
  52         struct object *obj;
  53
  54         perform_reachability_traversal(revs);
  55
  56         obj = lookup_object(the_repository, oid);
  57         return obj && (obj->flags & SEEN);
  58 }
  59
  60 static int prune_object(const struct object_id *oid, const char *fullpath,
  61                         void *data)
  62 {
  63         struct rev_info *revs = data;
  64         struct stat st;
  65
  66         if (is_object_reachable(oid, revs))
  67                 return 0;
  68
  69         if (lstat(fullpath, &st)) {
  70                 /* report errors, but do not stop pruning */
  71                 error("Could not stat '%s'", fullpath);
  72                 return 0;
  73         }
  74         if (st.st_mtime > expire)
  75                 return 0;
  76         if (show_only || verbose) {
  77                 enum object_type type = oid_object_info(the_repository, oid,
  78                                                         NULL);
  79                 printf("%s %s\n", oid_to_hex(oid),
  80                        (type > 0) ? type_name(type) : "unknown");
  81         }
  82         if (!show_only)
  83                 unlink_or_warn(fullpath);
  84         return 0;
  85 }
  86
  87 static int prune_cruft(const char *basename, const char *path, void *data)
  88 {
  89         if (starts_with(basename, "tmp_obj_"))
  90                 prune_tmp_file(path);
  91         else
  92                 fprintf(stderr, "bad sha1 file: %s\n", path);
  93         return 0;
  94 }
  95
  96 static int prune_subdir(unsigned int nr, const char *path, void *data)
  97 {
  98         if (!show_only)
  99                 rmdir(path);
 100         return 0;
 101 }
 102
 103 /*
 104  * Write errors (particularly out of space) can result in
 105  * failed temporary packs (and more rarely indexes and other
 106  * files beginning with "tmp_") accumulating in the object
 107  * and the pack directories.
 108  */
 109 static void remove_temporary_files(const char *path)
 110 {
 111         DIR *dir;
 112         struct dirent *de;
 113
 114         dir = opendir(path);
 115         if (!dir) {
 116                 fprintf(stderr, "Unable to open directory %s\n", path);
 117                 return;
 118         }
 119         while ((de = readdir(dir)) != NULL)
 120                 if (starts_with(de->d_name, "tmp_"))
 121                         prune_tmp_file(mkpath("%s/%s", path, de->d_name));
 122         closedir(dir);
 123 }
 124
 125 int cmd_prune(int argc, const char **argv, const char *prefix)
 126 {
 127         struct rev_info revs;
 128         int exclude_promisor_objects = 0;
 129         const struct option options[] = {
 130                 OPT__DRY_RUN(&show_only, N_("do not remove, show only")),
 131                 OPT__VERBOSE(&verbose, N_("report pruned objects")),
 132                 OPT_BOOL(0, "progress", &show_progress, N_("show progress")),
 133                 OPT_EXPIRY_DATE(0, "expire", &expire,
 134                                 N_("expire objects older than <time>")),
 135                 OPT_BOOL(0, "exclude-promisor-objects", &exclude_promisor_objects,
 136                          N_("limit traversal to objects outside promisor packfiles")),
 137                 OPT_END()
 138         };
 139         char *s;
 140
 141         expire = TIME_MAX;
 142         save_commit_buffer = 0;
 143         read_replace_refs = 0;
 144         ref_paranoia = 1;
 145         repo_init_revisions(the_repository, &revs, prefix);
 146
 147         argc = parse_options(argc, argv, prefix, options, prune_usage, 0);
 148
 149         if (repository_format_precious_objects)
 150                 die(_("cannot prune in a precious-objects repo"));
 151
 152         while (argc--) {
 153                 struct object_id oid;
 154                 const char *name = *argv++;
 155
 156                 if (!get_oid(name, &oid)) {
 157                         struct object *object = parse_object_or_die(&oid,
 158                                                                     name);
 159                         add_pending_object(&revs, object, "");
 160                 }
 161                 else
 162                         die("unrecognized argument: %s", name);
 163         }
 164
 165         if (show_progress == -1)
 166                 show_progress = isatty(2);
 167         if (exclude_promisor_objects) {
 168                 fetch_if_missing = 0;
 169                 revs.exclude_promisor_objects = 1;
 170         }
 171
 172         for_each_loose_file_in_objdir(get_object_directory(), prune_object,
 173                                       prune_cruft, prune_subdir, &revs);
 174
 175         prune_packed_objects(show_only ? PRUNE_PACKED_DRY_RUN : 0);
 176         remove_temporary_files(get_object_directory());
 177         s = mkpathdup("%s/pack", get_object_directory());
 178         remove_temporary_files(s);
 179         free(s);
 180
 181         if (is_repository_shallow(the_repository)) {
 182                 perform_reachability_traversal(&revs);
 183                 prune_shallow(show_only ? PRUNE_SHOW_ONLY : 0);
 184         }
 185
 186         return 0;
 187 }