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         "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_object(const char *path, const char *filename)
  21 {
  22         const char *fullpath = mkpath("%s/%s", path, filename);
  23         struct stat st;
  24         if (lstat(fullpath, &st))
  25                 return error("Could not stat '%s'", fullpath);
  26         if (st.st_mtime > expire)
  27                 return 0;
  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(char *path, const char *filename, const unsigned char *sha1)
  35 {
  36         const char *fullpath = mkpath("%s/%s", path, filename);
  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         if (show_only || verbose) {
  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         }
  47         if (!show_only)
  48                 unlink_or_warn(fullpath);
  49         return 0;
  50 }
  51
  52 static int prune_dir(int i, char *path)
  53 {
  54         DIR *dir = opendir(path);
  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                         prune_object(path, de->d_name, sha1);
  80                         continue;
  81                 }
  82                 if (!prefixcmp(de->d_name, "tmp_obj_")) {
  83                         prune_tmp_object(path, de->d_name);
  84                         continue;
  85                 }
  86                 fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
  87         }
  88         closedir(dir);
  89         if (!show_only)
  90                 rmdir(path);
  91         return 0;
  92 }
  93
  94 static void prune_object_dir(const char *path)
  95 {
  96         int i;
  97         for (i = 0; i < 256; i++) {
  98                 static char dir[4096];
  99                 sprintf(dir, "%s/%02x", path, i);
 100                 prune_dir(i, dir);
 101         }
 102 }
 103
 104 /*
 105  * Write errors (particularly out of space) can result in
 106  * failed temporary packs (and more rarely indexes and other
 107  * files beginning with "tmp_") accumulating in the object
 108  * and the pack directories.
 109  */
 110 static void remove_temporary_files(const char *path)
 111 {
 112         DIR *dir;
 113         struct dirent *de;
 114
 115         dir = opendir(path);
 116         if (!dir) {
 117                 fprintf(stderr, "Unable to open directory %s\n", path);
 118                 return;
 119         }
 120         while ((de = readdir(dir)) != NULL)
 121                 if (!prefixcmp(de->d_name, "tmp_"))
 122                         prune_tmp_object(path, de->d_name);
 123         closedir(dir);
 124 }
 125
 126 int cmd_prune(int argc, const char **argv, const char *prefix)
 127 {
 128         struct rev_info revs;
 129         struct progress *progress = NULL;
 130         const struct option options[] = {
 131                 OPT__DRY_RUN(&show_only, "do not remove, show only"),
 132                 OPT__VERBOSE(&verbose, "report pruned objects"),
 133                 OPT_BOOL(0, "progress", &show_progress, "show progress"),
 134                 OPT_DATE(0, "expire", &expire,
 135                          "expire objects older than <time>"),
 136                 OPT_END()
 137         };
 138         char *s;
 139
 140         expire = ULONG_MAX;
 141         save_commit_buffer = 0;
 142         read_replace_refs = 0;
 143         init_revisions(&revs, prefix);
 144
 145         argc = parse_options(argc, argv, prefix, 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
 160         if (show_progress == -1)
 161                 show_progress = isatty(2);
 162         if (show_progress)
 163                 progress = start_progress_delay("Checking connectivity", 0, 0, 2);
 164
 165         mark_reachable_objects(&revs, 1, progress);
 166         stop_progress(&progress);
 167         prune_object_dir(get_object_directory());
 168
 169         prune_packed_objects(show_only);
 170         remove_temporary_files(get_object_directory());
 171         s = xstrdup(mkpath("%s/pack", get_object_directory()));
 172         remove_temporary_files(s);
 173         free(s);
 174         return 0;
 175 }