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
  12 static const char * const prune_usage[] = {
  13         N_("git prune [-n] [-v] [--progress] [--expire <time>] [--] [<head>...]"),
  14         NULL
  15 };
  16 static int show_only;
  17 static int verbose;
  18 static timestamp_t expire;
  19 static int show_progress = -1;
  20
  21 static int prune_tmp_file(const char *fullpath)
  22 {
  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 void perform_reachability_traversal(struct rev_info *revs)
  36 {
  37         static int initialized;
  38         struct progress *progress = NULL;
  39
  40         if (initialized)
  41                 return;
  42
  43         if (show_progress)
  44                 progress = start_delayed_progress(_("Checking connectivity"), 0);
  45         mark_reachable_objects(revs, 1, expire, progress);
  46         stop_progress(&progress);
  47         initialized = 1;
  48 }
  49
  50 static int is_object_reachable(const struct object_id *oid,
  51                                struct rev_info *revs)
  52 {
  53         struct object *obj;
  54
  55         perform_reachability_traversal(revs);
  56
  57         obj = lookup_object(the_repository, oid);
  58         return obj && (obj->flags & SEEN);
  59 }
  60
  61 static int prune_object(const struct object_id *oid, const char *fullpath,
  62                         void *data)
  63 {
  64         struct rev_info *revs = data;
  65         struct stat st;
  66
  67         if (is_object_reachable(oid, revs))
  68                 return 0;
  69
  70         if (lstat(fullpath, &st)) {
  71                 /* report errors, but do not stop pruning */
  72                 error("Could not stat '%s'", fullpath);
  73                 return 0;
  74         }
  75         if (st.st_mtime > expire)
  76                 return 0;
  77         if (show_only || verbose) {
  78                 enum object_type type = oid_object_info(the_repository, oid,
  79                                                         NULL);
  80                 printf("%s %s\n", oid_to_hex(oid),
  81                        (type > 0) ? type_name(type) : "unknown");
  82         }
  83         if (!show_only)
  84                 unlink_or_warn(fullpath);
  85         return 0;
  86 }
  87
  88 static int prune_cruft(const char *basename, const char *path, void *data)
  89 {
  90         if (starts_with(basename, "tmp_obj_"))
  91                 prune_tmp_file(path);
  92         else
  93                 fprintf(stderr, "bad sha1 file: %s\n", path);
  94         return 0;
  95 }
  96
  97 static int prune_subdir(unsigned int nr, const char *path, void *data)
  98 {
  99         if (!show_only)
 100                 rmdir(path);
 101         return 0;
 102 }
 103
 104 /*
 105  * Write errors (particularly out of space) can result in
 106  * failed temporary packs (and more rarely indexes and other
 107  * files beginning with "tmp_") accumulating in the object
 108  * and the pack directories.
 109  */
 110 static void remove_temporary_files(const char *path)
 111 {
 112         DIR *dir;
 113         struct dirent *de;
 114
 115         dir = opendir(path);
 116         if (!dir) {
 117                 fprintf(stderr, "Unable to open directory %s\n", path);
 118                 return;
 119         }
 120         while ((de = readdir(dir)) != NULL)
 121                 if (starts_with(de->d_name, "tmp_"))
 122                         prune_tmp_file(mkpath("%s/%s", path, de->d_name));
 123         closedir(dir);
 124 }
 125
 126 int cmd_prune(int argc, const char **argv, const char *prefix)
 127 {
 128         struct rev_info revs;
 129         int exclude_promisor_objects = 0;
 130         const struct option options[] = {
 131                 OPT__DRY_RUN(&show_only, N_("do not remove, show only")),
 132                 OPT__VERBOSE(&verbose, N_("report pruned objects")),
 133                 OPT_BOOL(0, "progress", &show_progress, N_("show progress")),
 134                 OPT_EXPIRY_DATE(0, "expire", &expire,
 135                                 N_("expire objects older than <time>")),
 136                 OPT_BOOL(0, "exclude-promisor-objects", &exclude_promisor_objects,
 137                          N_("limit traversal to objects outside promisor packfiles")),
 138                 OPT_END()
 139         };
 140         char *s;
 141
 142         expire = TIME_MAX;
 143         save_commit_buffer = 0;
 144         read_replace_refs = 0;
 145         ref_paranoia = 1;
 146         repo_init_revisions(the_repository, &revs, prefix);
 147
 148         argc = parse_options(argc, argv, prefix, options, prune_usage, 0);
 149
 150         if (repository_format_precious_objects)
 151                 die(_("cannot prune in a precious-objects repo"));
 152
 153         while (argc--) {
 154                 struct object_id oid;
 155                 const char *name = *argv++;
 156
 157                 if (!get_oid(name, &oid)) {
 158                         struct object *object = parse_object_or_die(&oid,
 159                                                                     name);
 160                         add_pending_object(&revs, object, "");
 161                 }
 162                 else
 163                         die("unrecognized argument: %s", name);
 164         }
 165
 166         if (show_progress == -1)
 167                 show_progress = isatty(2);
 168         if (exclude_promisor_objects) {
 169                 fetch_if_missing = 0;
 170                 revs.exclude_promisor_objects = 1;
 171         }
 172
 173         for_each_loose_file_in_objdir(get_object_directory(), prune_object,
 174                                       prune_cruft, prune_subdir, &revs);
 175
 176         prune_packed_objects(show_only ? PRUNE_PACKED_DRY_RUN : 0);
 177         remove_temporary_files(get_object_directory());
 178         s = mkpathdup("%s/pack", get_object_directory());
 179         remove_temporary_files(s);
 180         free(s);
 181
 182         if (is_repository_shallow(the_repository)) {
 183                 perform_reachability_traversal(&revs);
 184                 prune_shallow(show_only ? PRUNE_SHOW_ONLY : 0);
 185         }
 186
 187         return 0;
 188 }