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 "prune-packed.h"
  10 #include "object-store.h"
  11 #include "shallow.h"
  12
  13 static const char * const prune_usage[] = {
  14         N_("git prune [-n] [-v] [--progress] [--expire <time>] [--] [<head>...]"),
  15         NULL
  16 };
  17 static int show_only;
  18 static int verbose;
  19 static timestamp_t expire;
  20 static int show_progress = -1;
  21
  22 static int prune_tmp_file(const char *fullpath)
  23 {
  24         struct stat st;
  25         if (lstat(fullpath, &st))
  26                 return error("Could not stat '%s'", fullpath);
  27         if (st.st_mtime > expire)
  28                 return 0;
  29         if (show_only || verbose)
  30                 printf("Removing stale temporary file %s\n", fullpath);
  31         if (!show_only)
  32                 unlink_or_warn(fullpath);
  33         return 0;
  34 }
  35
  36 static void perform_reachability_traversal(struct rev_info *revs)
  37 {
  38         static int initialized;
  39         struct progress *progress = NULL;
  40
  41         if (initialized)
  42                 return;
  43
  44         if (show_progress)
  45                 progress = start_delayed_progress(_("Checking connectivity"), 0);
  46         mark_reachable_objects(revs, 1, expire, progress);
  47         stop_progress(&progress);
  48         initialized = 1;
  49 }
  50
  51 static int is_object_reachable(const struct object_id *oid,
  52                                struct rev_info *revs)
  53 {
  54         struct object *obj;
  55
  56         perform_reachability_traversal(revs);
  57
  58         obj = lookup_object(the_repository, oid);
  59         return obj && (obj->flags & SEEN);
  60 }
  61
  62 static int prune_object(const struct object_id *oid, const char *fullpath,
  63                         void *data)
  64 {
  65         struct rev_info *revs = data;
  66         struct stat st;
  67
  68         if (is_object_reachable(oid, revs))
  69                 return 0;
  70
  71         if (lstat(fullpath, &st)) {
  72                 /* report errors, but do not stop pruning */
  73                 error("Could not stat '%s'", fullpath);
  74                 return 0;
  75         }
  76         if (st.st_mtime > expire)
  77                 return 0;
  78         if (show_only || verbose) {
  79                 enum object_type type = oid_object_info(the_repository, oid,
  80                                                         NULL);
  81                 printf("%s %s\n", oid_to_hex(oid),
  82                        (type > 0) ? type_name(type) : "unknown");
  83         }
  84         if (!show_only)
  85                 unlink_or_warn(fullpath);
  86         return 0;
  87 }
  88
  89 static int prune_cruft(const char *basename, const char *path, void *data)
  90 {
  91         if (starts_with(basename, "tmp_obj_"))
  92                 prune_tmp_file(path);
  93         else
  94                 fprintf(stderr, "bad sha1 file: %s\n", path);
  95         return 0;
  96 }
  97
  98 static int prune_subdir(unsigned int nr, const char *path, void *data)
  99 {
 100         if (!show_only)
 101                 rmdir(path);
 102         return 0;
 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 (starts_with(de->d_name, "tmp_"))
 123                         prune_tmp_file(mkpath("%s/%s", 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         int exclude_promisor_objects = 0;
 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_BOOL(0, "exclude-promisor-objects", &exclude_promisor_objects,
 138                          N_("limit traversal to objects outside promisor packfiles")),
 139                 OPT_END()
 140         };
 141         char *s;
 142
 143         expire = TIME_MAX;
 144         save_commit_buffer = 0;
 145         read_replace_refs = 0;
 146         ref_paranoia = 1;
 147         repo_init_revisions(the_repository, &revs, prefix);
 148
 149         argc = parse_options(argc, argv, prefix, options, prune_usage, 0);
 150
 151         if (repository_format_precious_objects)
 152                 die(_("cannot prune in a precious-objects repo"));
 153
 154         while (argc--) {
 155                 struct object_id oid;
 156                 const char *name = *argv++;
 157
 158                 if (!get_oid(name, &oid)) {
 159                         struct object *object = parse_object_or_die(&oid,
 160                                                                     name);
 161                         add_pending_object(&revs, object, "");
 162                 }
 163                 else
 164                         die("unrecognized argument: %s", name);
 165         }
 166
 167         if (show_progress == -1)
 168                 show_progress = isatty(2);
 169         if (exclude_promisor_objects) {
 170                 fetch_if_missing = 0;
 171                 revs.exclude_promisor_objects = 1;
 172         }
 173
 174         for_each_loose_file_in_objdir(get_object_directory(), prune_object,
 175                                       prune_cruft, prune_subdir, &revs);
 176
 177         prune_packed_objects(show_only ? PRUNE_PACKED_DRY_RUN : 0);
 178         remove_temporary_files(get_object_directory());
 179         s = mkpathdup("%s/pack", get_object_directory());
 180         remove_temporary_files(s);
 181         free(s);
 182
 183         if (is_repository_shallow(the_repository)) {
 184                 perform_reachability_traversal(&revs);
 185                 prune_shallow(show_only ? PRUNE_SHOW_ONLY : 0);
 186         }
 187
 188         return 0;
 189 }