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
   9 static const char * const prune_usage[] = {
  10         "git prune [-n] [-v] [--expire <time>] [--] [<head>...]",
  11         NULL
  12 };
  13 static int show_only;
  14 static int verbose;
  15 static unsigned long expire;
  16
  17 static int prune_tmp_object(const char *path, const char *filename)
  18 {
  19         const char *fullpath = mkpath("%s/%s", path, filename);
  20         if (expire) {
  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         }
  27         printf("Removing stale temporary file %s\n", fullpath);
  28         if (!show_only)
  29                 unlink(fullpath);
  30         return 0;
  31 }
  32
  33 static int prune_object(char *path, const char *filename, const unsigned char *sha1)
  34 {
  35         const char *fullpath = mkpath("%s/%s", path, filename);
  36         if (expire) {
  37                 struct stat st;
  38                 if (lstat(fullpath, &st))
  39                         return error("Could not stat '%s'", fullpath);
  40                 if (st.st_mtime > expire)
  41                         return 0;
  42         }
  43         if (show_only || verbose) {
  44                 enum object_type type = sha1_object_info(sha1, NULL);
  45                 printf("%s %s\n", sha1_to_hex(sha1),
  46                        (type > 0) ? typename(type) : "unknown");
  47         }
  48         if (!show_only)
  49                 unlink(fullpath);
  50         return 0;
  51 }
  52
  53 static int prune_dir(int i, char *path)
  54 {
  55         DIR *dir = opendir(path);
  56         struct dirent *de;
  57
  58         if (!dir)
  59                 return 0;
  60
  61         while ((de = readdir(dir)) != NULL) {
  62                 char name[100];
  63                 unsigned char sha1[20];
  64                 int len = strlen(de->d_name);
  65
  66                 switch (len) {
  67                 case 2:
  68                         if (de->d_name[1] != '.')
  69                                 break;
  70                 case 1:
  71                         if (de->d_name[0] != '.')
  72                                 break;
  73                         continue;
  74                 case 38:
  75                         sprintf(name, "%02x", i);
  76                         memcpy(name+2, de->d_name, len+1);
  77                         if (get_sha1_hex(name, sha1) < 0)
  78                                 break;
  79
  80                         /*
  81                          * Do we know about this object?
  82                          * It must have been reachable
  83                          */
  84                         if (lookup_object(sha1))
  85                                 continue;
  86
  87                         prune_object(path, de->d_name, sha1);
  88                         continue;
  89                 }
  90                 if (!prefixcmp(de->d_name, "tmp_obj_")) {
  91                         prune_tmp_object(path, de->d_name);
  92                         continue;
  93                 }
  94                 fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
  95         }
  96         if (!show_only)
  97                 rmdir(path);
  98         closedir(dir);
  99         return 0;
 100 }
 101
 102 static void prune_object_dir(const char *path)
 103 {
 104         int i;
 105         for (i = 0; i < 256; i++) {
 106                 static char dir[4096];
 107                 sprintf(dir, "%s/%02x", path, i);
 108                 prune_dir(i, dir);
 109         }
 110 }
 111
 112 /*
 113  * Write errors (particularly out of space) can result in
 114  * failed temporary packs (and more rarely indexes and other
 115  * files begining with "tmp_") accumulating in the object
 116  * and the pack directories.
 117  */
 118 static void remove_temporary_files(const char *path)
 119 {
 120         DIR *dir;
 121         struct dirent *de;
 122
 123         dir = opendir(path);
 124         if (!dir) {
 125                 fprintf(stderr, "Unable to open directory %s\n", path);
 126                 return;
 127         }
 128         while ((de = readdir(dir)) != NULL)
 129                 if (!prefixcmp(de->d_name, "tmp_"))
 130                         prune_tmp_object(path, de->d_name);
 131         closedir(dir);
 132 }
 133
 134 int cmd_prune(int argc, const char **argv, const char *prefix)
 135 {
 136         struct rev_info revs;
 137         const struct option options[] = {
 138                 OPT_BOOLEAN('n', NULL, &show_only,
 139                             "do not remove, show only"),
 140                 OPT_BOOLEAN('v', NULL, &verbose,
 141                         "report pruned objects"),
 142                 OPT_DATE(0, "expire", &expire,
 143                          "expire objects older than <time>"),
 144                 OPT_END()
 145         };
 146         char *s;
 147
 148         save_commit_buffer = 0;
 149         init_revisions(&revs, prefix);
 150
 151         argc = parse_options(argc, argv, options, prune_usage, 0);
 152         while (argc--) {
 153                 unsigned char sha1[20];
 154                 const char *name = *argv++;
 155
 156                 if (!get_sha1(name, sha1)) {
 157                         struct object *object = parse_object(sha1);
 158                         if (!object)
 159                                 die("bad object: %s", name);
 160                         add_pending_object(&revs, object, "");
 161                 }
 162                 else
 163                         die("unrecognized argument: %s", name);
 164         }
 165         mark_reachable_objects(&revs, 1);
 166         prune_object_dir(get_object_directory());
 167
 168         prune_packed_objects(show_only);
 169         remove_temporary_files(get_object_directory());
 170         s = xstrdup(mkpath("%s/pack", get_object_directory()));
 171         remove_temporary_files(s);
 172         free(s);
 173         return 0;
 174 }