pack-objects: refactor unpack-unreachable expiration check
[git/git.git] / reachable.c
CommitLineData
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1#include "cache.h"
2#include "refs.h"
3#include "tag.h"
4#include "commit.h"
5#include "blob.h"
6#include "diff.h"
7#include "revision.h"
8#include "reachable.h"
9#include "cache-tree.h"
dc347195 10#include "progress.h"
5f78a431 11#include "list-objects.h"
94421474 12
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13struct connectivity_progress {
14 struct progress *progress;
15 unsigned long count;
16};
17
18static void update_progress(struct connectivity_progress *cp)
19{
20 cp->count++;
21 if ((cp->count & 1023) == 0)
22 display_progress(cp->progress, cp->count);
23}
24
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25static int add_one_ref(const char *path, const unsigned char *sha1, int flag, void *cb_data)
26{
f7892d18 27 struct object *object = parse_object_or_die(sha1, path);
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28 struct rev_info *revs = (struct rev_info *)cb_data;
29
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30 add_pending_object(revs, object, "");
31
32 return 0;
33}
34
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35static void add_one_tree(const unsigned char *sha1, struct rev_info *revs)
36{
37 struct tree *tree = lookup_tree(sha1);
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38 if (tree)
39 add_pending_object(revs, &tree->object, "");
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40}
41
42static void add_cache_tree(struct cache_tree *it, struct rev_info *revs)
43{
44 int i;
45
46 if (it->entry_count >= 0)
47 add_one_tree(it->sha1, revs);
48 for (i = 0; i < it->subtree_nr; i++)
49 add_cache_tree(it->down[i]->cache_tree, revs);
50}
51
52static void add_cache_refs(struct rev_info *revs)
53{
54 int i;
55
56 read_cache();
57 for (i = 0; i < active_nr; i++) {
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58 struct blob *blob;
59
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60 /*
61 * The index can contain blobs and GITLINKs, GITLINKs are hashes
62 * that don't actually point to objects in the repository, it's
63 * almost guaranteed that they are NOT blobs, so we don't call
64 * lookup_blob() on them, to avoid populating the hash table
65 * with invalid information
66 */
7a51ed66 67 if (S_ISGITLINK(active_cache[i]->ce_mode))
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68 continue;
69
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70 blob = lookup_blob(active_cache[i]->sha1);
71 if (blob)
72 blob->object.flags |= SEEN;
73
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74 /*
75 * We could add the blobs to the pending list, but quite
76 * frankly, we don't care. Once we've looked them up, and
77 * added them as objects, we've really done everything
78 * there is to do for a blob
79 */
80 }
81 if (active_cache_tree)
82 add_cache_tree(active_cache_tree, revs);
83}
84
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85/*
86 * The traversal will have already marked us as SEEN, so we
87 * only need to handle any progress reporting here.
88 */
89static void mark_object(struct object *obj, const struct name_path *path,
90 const char *name, void *data)
91{
92 update_progress(data);
93}
94
95static void mark_commit(struct commit *c, void *data)
96{
97 mark_object(&c->object, NULL, NULL, data);
98}
99
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100struct recent_data {
101 struct rev_info *revs;
102 unsigned long timestamp;
103};
104
105static void add_recent_object(const unsigned char *sha1,
106 unsigned long mtime,
107 struct recent_data *data)
108{
109 struct object *obj;
110 enum object_type type;
111
112 if (mtime <= data->timestamp)
113 return;
114
115 /*
116 * We do not want to call parse_object here, because
117 * inflating blobs and trees could be very expensive.
118 * However, we do need to know the correct type for
119 * later processing, and the revision machinery expects
120 * commits and tags to have been parsed.
121 */
122 type = sha1_object_info(sha1, NULL);
123 if (type < 0)
124 die("unable to get object info for %s", sha1_to_hex(sha1));
125
126 switch (type) {
127 case OBJ_TAG:
128 case OBJ_COMMIT:
129 obj = parse_object_or_die(sha1, NULL);
130 break;
131 case OBJ_TREE:
132 obj = (struct object *)lookup_tree(sha1);
133 break;
134 case OBJ_BLOB:
135 obj = (struct object *)lookup_blob(sha1);
136 break;
137 default:
138 die("unknown object type for %s: %s",
139 sha1_to_hex(sha1), typename(type));
140 }
141
142 if (!obj)
143 die("unable to lookup %s", sha1_to_hex(sha1));
144
145 add_pending_object(data->revs, obj, "");
146}
147
148static int add_recent_loose(const unsigned char *sha1,
149 const char *path, void *data)
150{
151 struct stat st;
152 struct object *obj = lookup_object(sha1);
153
154 if (obj && obj->flags & SEEN)
155 return 0;
156
157 if (stat(path, &st) < 0) {
158 /*
159 * It's OK if an object went away during our iteration; this
160 * could be due to a simultaneous repack. But anything else
161 * we should abort, since we might then fail to mark objects
162 * which should not be pruned.
163 */
164 if (errno == ENOENT)
165 return 0;
166 return error("unable to stat %s: %s",
167 sha1_to_hex(sha1), strerror(errno));
168 }
169
170 add_recent_object(sha1, st.st_mtime, data);
171 return 0;
172}
173
174static int add_recent_packed(const unsigned char *sha1,
175 struct packed_git *p, uint32_t pos,
176 void *data)
177{
178 struct object *obj = lookup_object(sha1);
179
180 if (obj && obj->flags & SEEN)
181 return 0;
182 add_recent_object(sha1, p->mtime, data);
183 return 0;
184}
185
186static int add_unseen_recent_objects_to_traversal(struct rev_info *revs,
187 unsigned long timestamp)
188{
189 struct recent_data data;
190 int r;
191
192 data.revs = revs;
193 data.timestamp = timestamp;
194
195 r = for_each_loose_object(add_recent_loose, &data);
196 if (r)
197 return r;
198 return for_each_packed_object(add_recent_packed, &data);
199}
200
dc347195 201void mark_reachable_objects(struct rev_info *revs, int mark_reflog,
d3038d22 202 unsigned long mark_recent,
dc347195 203 struct progress *progress)
94421474 204{
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205 struct connectivity_progress cp;
206
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207 /*
208 * Set up revision parsing, and mark us as being interested
209 * in all object types, not just commits.
210 */
211 revs->tag_objects = 1;
212 revs->blob_objects = 1;
213 revs->tree_objects = 1;
214
215 /* Add all refs from the index file */
216 add_cache_refs(revs);
217
218 /* Add all external refs */
219 for_each_ref(add_one_ref, revs);
220
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221 /* detached HEAD is not included in the list above */
222 head_ref(add_one_ref, revs);
223
eb8381c8 224 /* Add all reflog info */
94421474 225 if (mark_reflog)
718ccc97 226 add_reflogs_to_pending(revs, 0);
94421474 227
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228 cp.progress = progress;
229 cp.count = 0;
230
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231 /*
232 * Set up the revision walk - this will move all commits
233 * from the pending list to the commit walking list.
234 */
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235 if (prepare_revision_walk(revs))
236 die("revision walk setup failed");
5f78a431 237 traverse_commit_list(revs, mark_commit, mark_object, &cp);
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238
239 if (mark_recent) {
240 revs->ignore_missing_links = 1;
241 if (add_unseen_recent_objects_to_traversal(revs, mark_recent))
242 die("unable to mark recent objects");
243 if (prepare_revision_walk(revs))
244 die("revision walk setup failed");
245 traverse_commit_list(revs, mark_commit, mark_object, &cp);
246 }
247
0b26abc0 248 display_progress(cp.progress, cp.count);
94421474 249}