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_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 int prune_object(const char *fullpath, const unsigned char *sha1)
  35 {
  36         struct stat st;
  37         if (lstat(fullpath, &st))
  38                 return error("Could not stat '%s'", fullpath);
  39         if (st.st_mtime > expire)
  40                 return 0;
  41         if (show_only || verbose) {
  42                 enum object_type type = sha1_object_info(sha1, NULL);
  43                 printf("%s %s\n", sha1_to_hex(sha1),
  44                        (type > 0) ? typename(type) : "unknown");
  45         }
  46         if (!show_only)
  47                 unlink_or_warn(fullpath);
  48         return 0;
  49 }
  50
  51 static int prune_dir(int i, struct strbuf *path)
  52 {
  53         size_t baselen = path->len;
  54         DIR *dir = opendir(path->buf);
  55         struct dirent *de;
  56
  57         if (!dir)
  58                 return 0;
  59
  60         while ((de = readdir(dir)) != NULL) {
  61                 char name[100];
  62                 unsigned char sha1[20];
  63
  64                 if (is_dot_or_dotdot(de->d_name))
  65                         continue;
  66                 if (strlen(de->d_name) == 38) {
  67                         sprintf(name, "%02x", i);
  68                         memcpy(name+2, de->d_name, 39);
  69                         if (get_sha1_hex(name, sha1) < 0)
  70                                 break;
  71
  72                         /*
  73                          * Do we know about this object?
  74                          * It must have been reachable
  75                          */
  76                         if (lookup_object(sha1))
  77                                 continue;
  78
  79                         strbuf_addf(path, "/%s", de->d_name);
  80                         prune_object(path->buf, sha1);
  81                         strbuf_setlen(path, baselen);
  82                         continue;
  83                 }
  84                 if (starts_with(de->d_name, "tmp_obj_")) {
  85                         strbuf_addf(path, "/%s", de->d_name);
  86                         prune_tmp_file(path->buf);
  87                         strbuf_setlen(path, baselen);
  88                         continue;
  89                 }
  90                 fprintf(stderr, "bad sha1 file: %s/%s\n", path->buf, de->d_name);
  91         }
  92         closedir(dir);
  93         if (!show_only)
  94                 rmdir(path->buf);
  95         return 0;
  96 }
  97
  98 static void prune_object_dir(const char *path)
  99 {
 100         struct strbuf buf = STRBUF_INIT;
 101         size_t baselen;
 102         int i;
 103
 104         strbuf_addstr(&buf, path);
 105         strbuf_addch(&buf, '/');
 106         baselen = buf.len;
 107
 108         for (i = 0; i < 256; i++) {
 109                 strbuf_addf(&buf, "%02x", i);
 110                 prune_dir(i, &buf);
 111                 strbuf_setlen(&buf, baselen);
 112         }
 113 }
 114
 115 /*
 116  * Write errors (particularly out of space) can result in
 117  * failed temporary packs (and more rarely indexes and other
 118  * files beginning with "tmp_") accumulating in the object
 119  * and the pack directories.
 120  */
 121 static void remove_temporary_files(const char *path)
 122 {
 123         DIR *dir;
 124         struct dirent *de;
 125
 126         dir = opendir(path);
 127         if (!dir) {
 128                 fprintf(stderr, "Unable to open directory %s\n", path);
 129                 return;
 130         }
 131         while ((de = readdir(dir)) != NULL)
 132                 if (starts_with(de->d_name, "tmp_"))
 133                         prune_tmp_file(mkpath("%s/%s", path, de->d_name));
 134         closedir(dir);
 135 }
 136
 137 int cmd_prune(int argc, const char **argv, const char *prefix)
 138 {
 139         struct rev_info revs;
 140         struct progress *progress = NULL;
 141         const struct option options[] = {
 142                 OPT__DRY_RUN(&show_only, N_("do not remove, show only")),
 143                 OPT__VERBOSE(&verbose, N_("report pruned objects")),
 144                 OPT_BOOL(0, "progress", &show_progress, N_("show progress")),
 145                 OPT_EXPIRY_DATE(0, "expire", &expire,
 146                                 N_("expire objects older than <time>")),
 147                 OPT_END()
 148         };
 149         char *s;
 150
 151         expire = ULONG_MAX;
 152         save_commit_buffer = 0;
 153         read_replace_refs = 0;
 154         init_revisions(&revs, prefix);
 155
 156         argc = parse_options(argc, argv, prefix, options, prune_usage, 0);
 157         while (argc--) {
 158                 unsigned char sha1[20];
 159                 const char *name = *argv++;
 160
 161                 if (!get_sha1(name, sha1)) {
 162                         struct object *object = parse_object_or_die(sha1, name);
 163                         add_pending_object(&revs, object, "");
 164                 }
 165                 else
 166                         die("unrecognized argument: %s", name);
 167         }
 168
 169         if (show_progress == -1)
 170                 show_progress = isatty(2);
 171         if (show_progress)
 172                 progress = start_progress_delay("Checking connectivity", 0, 0, 2);
 173
 174         mark_reachable_objects(&revs, 1, progress);
 175         stop_progress(&progress);
 176         prune_object_dir(get_object_directory());
 177
 178         prune_packed_objects(show_only ? PRUNE_PACKED_DRY_RUN : 0);
 179         remove_temporary_files(get_object_directory());
 180         s = mkpathdup("%s/pack", get_object_directory());
 181         remove_temporary_files(s);
 182         free(s);
 183         return 0;
 184 }