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         if (expire) {
  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         }
  28         printf("Removing stale temporary file %s\n", fullpath);
  29         if (!show_only)
  30                 unlink(fullpath);
  31         return 0;
  32 }
  33
  34 static int prune_object(char *path, const char *filename, const unsigned char *sha1)
  35 {
  36         const char *fullpath = mkpath("%s/%s", path, filename);
  37         if (expire) {
  38                 struct stat st;
  39                 if (lstat(fullpath, &st))
  40                         return error("Could not stat '%s'", fullpath);
  41                 if (st.st_mtime > expire)
  42                         return 0;
  43         }
  44         if (show_only || verbose) {
  45                 enum object_type type = sha1_object_info(sha1, NULL);
  46                 printf("%s %s\n", sha1_to_hex(sha1),
  47                        (type > 0) ? typename(type) : "unknown");
  48         }
  49         if (!show_only)
  50                 unlink(fullpath);
  51         return 0;
  52 }
  53
  54 static int prune_dir(int i, char *path)
  55 {
  56         DIR *dir = opendir(path);
  57         struct dirent *de;
  58
  59         if (!dir)
  60                 return 0;
  61
  62         while ((de = readdir(dir)) != NULL) {
  63                 char name[100];
  64                 unsigned char sha1[20];
  65
  66                 if (is_dot_or_dotdot(de->d_name))
  67                         continue;
  68                 if (strlen(de->d_name) == 38) {
  69                         sprintf(name, "%02x", i);
  70                         memcpy(name+2, de->d_name, 39);
  71                         if (get_sha1_hex(name, sha1) < 0)
  72                                 break;
  73
  74                         /*
  75                          * Do we know about this object?
  76                          * It must have been reachable
  77                          */
  78                         if (lookup_object(sha1))
  79                                 continue;
  80
  81                         prune_object(path, de->d_name, sha1);
  82                         continue;
  83                 }
  84                 if (!prefixcmp(de->d_name, "tmp_obj_")) {
  85                         prune_tmp_object(path, de->d_name);
  86                         continue;
  87                 }
  88                 fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
  89         }
  90         if (!show_only)
  91                 rmdir(path);
  92         closedir(dir);
  93         return 0;
  94 }
  95
  96 static void prune_object_dir(const char *path)
  97 {
  98         int i;
  99         for (i = 0; i < 256; i++) {
 100                 static char dir[4096];
 101                 sprintf(dir, "%s/%02x", path, i);
 102                 prune_dir(i, dir);
 103         }
 104 }
 105
 106 /*
 107  * Write errors (particularly out of space) can result in
 108  * failed temporary packs (and more rarely indexes and other
 109  * files begining with "tmp_") accumulating in the object
 110  * and the pack directories.
 111  */
 112 static void remove_temporary_files(const char *path)
 113 {
 114         DIR *dir;
 115         struct dirent *de;
 116
 117         dir = opendir(path);
 118         if (!dir) {
 119                 fprintf(stderr, "Unable to open directory %s\n", path);
 120                 return;
 121         }
 122         while ((de = readdir(dir)) != NULL)
 123                 if (!prefixcmp(de->d_name, "tmp_"))
 124                         prune_tmp_object(path, de->d_name);
 125         closedir(dir);
 126 }
 127
 128 int cmd_prune(int argc, const char **argv, const char *prefix)
 129 {
 130         struct rev_info revs;
 131         const struct option options[] = {
 132                 OPT_BOOLEAN('n', NULL, &show_only,
 133                             "do not remove, show only"),
 134                 OPT_BOOLEAN('v', NULL, &verbose,
 135                         "report pruned objects"),
 136                 OPT_DATE(0, "expire", &expire,
 137                          "expire objects older than <time>"),
 138                 OPT_END()
 139         };
 140         char *s;
 141
 142         save_commit_buffer = 0;
 143         init_revisions(&revs, prefix);
 144
 145         argc = parse_options(argc, argv, options, prune_usage, 0);
 146         while (argc--) {
 147                 unsigned char sha1[20];
 148                 const char *name = *argv++;
 149
 150                 if (!get_sha1(name, sha1)) {
 151                         struct object *object = parse_object(sha1);
 152                         if (!object)
 153                                 die("bad object: %s", name);
 154                         add_pending_object(&revs, object, "");
 155                 }
 156                 else
 157                         die("unrecognized argument: %s", name);
 158         }
 159         mark_reachable_objects(&revs, 1);
 160         prune_object_dir(get_object_directory());
 161
 162         prune_packed_objects(show_only);
 163         remove_temporary_files(get_object_directory());
 164         s = xstrdup(mkpath("%s/pack", get_object_directory()));
 165         remove_temporary_files(s);
 166         free(s);
 167         return 0;
 168 }