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] [--expire <time>] [--] [<head>...]",
  11         NULL
  12 };
  13 static int show_only;
  14 static unsigned long expire;
  15
  16 static int prune_tmp_object(const char *path, const char *filename)
  17 {
  18         const char *fullpath = mkpath("%s/%s", path, filename);
  19         if (expire) {
  20                 struct stat st;
  21                 if (lstat(fullpath, &st))
  22                         return error("Could not stat '%s'", fullpath);
  23                 if (st.st_mtime > expire)
  24                         return 0;
  25         }
  26         printf("Removing stale temporary file %s\n", fullpath);
  27         if (!show_only)
  28                 unlink(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         if (expire) {
  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         }
  42         if (show_only) {
  43                 enum object_type type = sha1_object_info(sha1, NULL);
  44                 printf("%s %s\n", sha1_to_hex(sha1),
  45                        (type > 0) ? typename(type) : "unknown");
  46         } else
  47                 unlink(fullpath);
  48         return 0;
  49 }
  50
  51 static int prune_dir(int i, char *path)
  52 {
  53         DIR *dir = opendir(path);
  54         struct dirent *de;
  55
  56         if (!dir)
  57                 return 0;
  58
  59         while ((de = readdir(dir)) != NULL) {
  60                 char name[100];
  61                 unsigned char sha1[20];
  62                 int len = strlen(de->d_name);
  63
  64                 switch (len) {
  65                 case 2:
  66                         if (de->d_name[1] != '.')
  67                                 break;
  68                 case 1:
  69                         if (de->d_name[0] != '.')
  70                                 break;
  71                         continue;
  72                 case 38:
  73                         sprintf(name, "%02x", i);
  74                         memcpy(name+2, de->d_name, len+1);
  75                         if (get_sha1_hex(name, sha1) < 0)
  76                                 break;
  77
  78                         /*
  79                          * Do we know about this object?
  80                          * It must have been reachable
  81                          */
  82                         if (lookup_object(sha1))
  83                                 continue;
  84
  85                         prune_object(path, de->d_name, sha1);
  86                         continue;
  87                 }
  88                 if (!prefixcmp(de->d_name, "tmp_obj_")) {
  89                         prune_tmp_object(path, de->d_name);
  90                         continue;
  91                 }
  92                 fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
  93         }
  94         if (!show_only)
  95                 rmdir(path);
  96         closedir(dir);
  97         return 0;
  98 }
  99
 100 static void prune_object_dir(const char *path)
 101 {
 102         int i;
 103         for (i = 0; i < 256; i++) {
 104                 static char dir[4096];
 105                 sprintf(dir, "%s/%02x", path, i);
 106                 prune_dir(i, dir);
 107         }
 108 }
 109
 110 /*
 111  * Write errors (particularly out of space) can result in
 112  * failed temporary packs (and more rarely indexes and other
 113  * files begining with "tmp_") accumulating in the object
 114  * and the pack directories.
 115  */
 116 static void remove_temporary_files(const char *path)
 117 {
 118         DIR *dir;
 119         struct dirent *de;
 120
 121         dir = opendir(path);
 122         if (!dir) {
 123                 fprintf(stderr, "Unable to open directory %s\n", path);
 124                 return;
 125         }
 126         while ((de = readdir(dir)) != NULL)
 127                 if (!prefixcmp(de->d_name, "tmp_"))
 128                         prune_tmp_object(path, de->d_name);
 129         closedir(dir);
 130 }
 131
 132 int cmd_prune(int argc, const char **argv, const char *prefix)
 133 {
 134         struct rev_info revs;
 135         const struct option options[] = {
 136                 OPT_BOOLEAN('n', NULL, &show_only,
 137                             "do not remove, show only"),
 138                 OPT_DATE(0, "expire", &expire,
 139                          "expire objects older than <time>"),
 140                 OPT_END()
 141         };
 142         char *s;
 143
 144         save_commit_buffer = 0;
 145         init_revisions(&revs, prefix);
 146
 147         argc = parse_options(argc, argv, options, prune_usage, 0);
 148         while (argc--) {
 149                 unsigned char sha1[20];
 150                 const char *name = *argv++;
 151
 152                 if (!get_sha1(name, sha1)) {
 153                         struct object *object = parse_object(sha1);
 154                         if (!object)
 155                                 die("bad object: %s", name);
 156                         add_pending_object(&revs, object, "");
 157                 }
 158                 else
 159                         die("unrecognized argument: %s", name);
 160         }
 161         mark_reachable_objects(&revs, 1);
 162         prune_object_dir(get_object_directory());
 163
 164         prune_packed_objects(show_only);
 165         remove_temporary_files(get_object_directory());
 166         s = xstrdup(mkpath("%s/pack", get_object_directory()));
 167         remove_temporary_files(s);
 168         free(s);
 169         return 0;
 170 }