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