builtin-prune.c

   1 #include "cache.h"
   2 #include "refs.h"
   3 #include "tag.h"
   4 #include "commit.h"
   5 #include "tree.h"
   6 #include "blob.h"
   7 #include "tree-walk.h"
   8 #include "diff.h"
   9 #include "revision.h"
  10 #include "builtin.h"
  11 #include "cache-tree.h"
  12
  13 static const char prune_usage[] = "git-prune [-n]";
  14 static int show_only;
  15 static struct rev_info revs;
  16
  17 static int prune_object(char *path, const char *filename, const unsigned char *sha1)
  18 {
  19         char buf[20];
  20         const char *type;
  21
  22         if (show_only) {
  23                 if (sha1_object_info(sha1, buf, NULL))
  24                         type = "unknown";
  25                 else
  26                         type = buf;
  27                 printf("%s %s\n", sha1_to_hex(sha1), type);
  28                 return 0;
  29         }
  30         unlink(mkpath("%s/%s", path, filename));
  31         rmdir(path);
  32         return 0;
  33 }
  34
  35 static int prune_dir(int i, char *path)
  36 {
  37         DIR *dir = opendir(path);
  38         struct dirent *de;
  39
  40         if (!dir)
  41                 return 0;
  42
  43         while ((de = readdir(dir)) != NULL) {
  44                 char name[100];
  45                 unsigned char sha1[20];
  46                 int len = strlen(de->d_name);
  47
  48                 switch (len) {
  49                 case 2:
  50                         if (de->d_name[1] != '.')
  51                                 break;
  52                 case 1:
  53                         if (de->d_name[0] != '.')
  54                                 break;
  55                         continue;
  56                 case 38:
  57                         sprintf(name, "%02x", i);
  58                         memcpy(name+2, de->d_name, len+1);
  59                         if (get_sha1_hex(name, sha1) < 0)
  60                                 break;
  61
  62                         /*
  63                          * Do we know about this object?
  64                          * It must have been reachable
  65                          */
  66                         if (lookup_object(sha1))
  67                                 continue;
  68
  69                         prune_object(path, de->d_name, sha1);
  70                         continue;
  71                 }
  72                 fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
  73         }
  74         closedir(dir);
  75         return 0;
  76 }
  77
  78 static void prune_object_dir(const char *path)
  79 {
  80         int i;
  81         for (i = 0; i < 256; i++) {
  82                 static char dir[4096];
  83                 sprintf(dir, "%s/%02x", path, i);
  84                 prune_dir(i, dir);
  85         }
  86 }
  87
  88 static void process_blob(struct blob *blob,
  89                          struct object_array *p,
  90                          struct name_path *path,
  91                          const char *name)
  92 {
  93         struct object *obj = &blob->object;
  94
  95         if (obj->flags & SEEN)
  96                 return;
  97         obj->flags |= SEEN;
  98         /* Nothing to do, really .. The blob lookup was the important part */
  99 }
 100
 101 static void process_tree(struct tree *tree,
 102                          struct object_array *p,
 103                          struct name_path *path,
 104                          const char *name)
 105 {
 106         struct object *obj = &tree->object;
 107         struct tree_desc desc;
 108         struct name_entry entry;
 109         struct name_path me;
 110
 111         if (obj->flags & SEEN)
 112                 return;
 113         obj->flags |= SEEN;
 114         if (parse_tree(tree) < 0)
 115                 die("bad tree object %s", sha1_to_hex(obj->sha1));
 116         name = xstrdup(name);
 117         add_object(obj, p, path, name);
 118         me.up = path;
 119         me.elem = name;
 120         me.elem_len = strlen(name);
 121
 122         desc.buf = tree->buffer;
 123         desc.size = tree->size;
 124
 125         while (tree_entry(&desc, &entry)) {
 126                 if (S_ISDIR(entry.mode))
 127                         process_tree(lookup_tree(entry.sha1), p, &me, entry.path);
 128                 else
 129                         process_blob(lookup_blob(entry.sha1), p, &me, entry.path);
 130         }
 131         free(tree->buffer);
 132         tree->buffer = NULL;
 133 }
 134
 135 static void process_tag(struct tag *tag, struct object_array *p, const char *name)
 136 {
 137         struct object *obj = &tag->object;
 138         struct name_path me;
 139
 140         if (obj->flags & SEEN)
 141                 return;
 142         obj->flags |= SEEN;
 143
 144         me.up = NULL;
 145         me.elem = "tag:/";
 146         me.elem_len = 5;
 147
 148         if (parse_tag(tag) < 0)
 149                 die("bad tag object %s", sha1_to_hex(obj->sha1));
 150         add_object(tag->tagged, p, NULL, name);
 151 }
 152
 153 static void walk_commit_list(struct rev_info *revs)
 154 {
 155         int i;
 156         struct commit *commit;
 157         struct object_array objects = { 0, 0, NULL };
 158
 159         /* Walk all commits, process their trees */
 160         while ((commit = get_revision(revs)) != NULL)
 161                 process_tree(commit->tree, &objects, NULL, "");
 162
 163         /* Then walk all the pending objects, recursively processing them too */
 164         for (i = 0; i < revs->pending.nr; i++) {
 165                 struct object_array_entry *pending = revs->pending.objects + i;
 166                 struct object *obj = pending->item;
 167                 const char *name = pending->name;
 168                 if (obj->type == OBJ_TAG) {
 169                         process_tag((struct tag *) obj, &objects, name);
 170                         continue;
 171                 }
 172                 if (obj->type == OBJ_TREE) {
 173                         process_tree((struct tree *)obj, &objects, NULL, name);
 174                         continue;
 175                 }
 176                 if (obj->type == OBJ_BLOB) {
 177                         process_blob((struct blob *)obj, &objects, NULL, name);
 178                         continue;
 179                 }
 180                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
 181         }
 182 }
 183
 184 static int add_one_ref(const char *path, const unsigned char *sha1, int flag, void *cb_data)
 185 {
 186         struct object *object = parse_object(sha1);
 187         if (!object)
 188                 die("bad object ref: %s:%s", path, sha1_to_hex(sha1));
 189         add_pending_object(&revs, object, "");
 190         return 0;
 191 }
 192
 193 static void add_one_tree(const unsigned char *sha1)
 194 {
 195         struct tree *tree = lookup_tree(sha1);
 196         add_pending_object(&revs, &tree->object, "");
 197 }
 198
 199 static void add_cache_tree(struct cache_tree *it)
 200 {
 201         int i;
 202
 203         if (it->entry_count >= 0)
 204                 add_one_tree(it->sha1);
 205         for (i = 0; i < it->subtree_nr; i++)
 206                 add_cache_tree(it->down[i]->cache_tree);
 207 }
 208
 209 static void add_cache_refs(void)
 210 {
 211         int i;
 212
 213         read_cache();
 214         for (i = 0; i < active_nr; i++) {
 215                 lookup_blob(active_cache[i]->sha1);
 216                 /*
 217                  * We could add the blobs to the pending list, but quite
 218                  * frankly, we don't care. Once we've looked them up, and
 219                  * added them as objects, we've really done everything
 220                  * there is to do for a blob
 221                  */
 222         }
 223         if (active_cache_tree)
 224                 add_cache_tree(active_cache_tree);
 225 }
 226
 227 int cmd_prune(int argc, const char **argv, const char *prefix)
 228 {
 229         int i;
 230
 231         for (i = 1; i < argc; i++) {
 232                 const char *arg = argv[i];
 233                 if (!strcmp(arg, "-n")) {
 234                         show_only = 1;
 235                         continue;
 236                 }
 237                 usage(prune_usage);
 238         }
 239
 240         /*
 241          * Set up revision parsing, and mark us as being interested
 242          * in all object types, not just commits.
 243          */
 244         init_revisions(&revs, prefix);
 245         revs.tag_objects = 1;
 246         revs.blob_objects = 1;
 247         revs.tree_objects = 1;
 248
 249         /* Add all external refs */
 250         for_each_ref(add_one_ref, NULL);
 251
 252         /* Add all refs from the index file */
 253         add_cache_refs();
 254
 255         /*
 256          * Set up the revision walk - this will move all commits
 257          * from the pending list to the commit walking list.
 258          */
 259         prepare_revision_walk(&revs);
 260
 261         walk_commit_list(&revs);
 262
 263         prune_object_dir(get_object_directory());
 264
 265         sync();
 266         prune_packed_objects(show_only);
 267         return 0;
 268 }