Merge branch 'nd/stop-setenv-work-tree' into nd/clear-gitenv-upon-use-of-alias
[git] / reachable.c
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"
10 #include "progress.h"
11 #include "list-objects.h"
12
13 struct connectivity_progress {
14         struct progress *progress;
15         unsigned long count;
16 };
17
18 static 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
25 static int add_one_ref(const char *path, const struct object_id *oid,
26                        int flag, void *cb_data)
27 {
28         struct object *object = parse_object_or_die(oid->hash, path);
29         struct rev_info *revs = (struct rev_info *)cb_data;
30
31         add_pending_object(revs, object, "");
32
33         return 0;
34 }
35
36 /*
37  * The traversal will have already marked us as SEEN, so we
38  * only need to handle any progress reporting here.
39  */
40 static void mark_object(struct object *obj, const struct name_path *path,
41                         const char *name, void *data)
42 {
43         update_progress(data);
44 }
45
46 static void mark_commit(struct commit *c, void *data)
47 {
48         mark_object(&c->object, NULL, NULL, data);
49 }
50
51 struct recent_data {
52         struct rev_info *revs;
53         unsigned long timestamp;
54 };
55
56 static void add_recent_object(const unsigned char *sha1,
57                               unsigned long mtime,
58                               struct recent_data *data)
59 {
60         struct object *obj;
61         enum object_type type;
62
63         if (mtime <= data->timestamp)
64                 return;
65
66         /*
67          * We do not want to call parse_object here, because
68          * inflating blobs and trees could be very expensive.
69          * However, we do need to know the correct type for
70          * later processing, and the revision machinery expects
71          * commits and tags to have been parsed.
72          */
73         type = sha1_object_info(sha1, NULL);
74         if (type < 0)
75                 die("unable to get object info for %s", sha1_to_hex(sha1));
76
77         switch (type) {
78         case OBJ_TAG:
79         case OBJ_COMMIT:
80                 obj = parse_object_or_die(sha1, NULL);
81                 break;
82         case OBJ_TREE:
83                 obj = (struct object *)lookup_tree(sha1);
84                 break;
85         case OBJ_BLOB:
86                 obj = (struct object *)lookup_blob(sha1);
87                 break;
88         default:
89                 die("unknown object type for %s: %s",
90                     sha1_to_hex(sha1), typename(type));
91         }
92
93         if (!obj)
94                 die("unable to lookup %s", sha1_to_hex(sha1));
95
96         add_pending_object(data->revs, obj, "");
97 }
98
99 static int add_recent_loose(const unsigned char *sha1,
100                             const char *path, void *data)
101 {
102         struct stat st;
103         struct object *obj = lookup_object(sha1);
104
105         if (obj && obj->flags & SEEN)
106                 return 0;
107
108         if (stat(path, &st) < 0) {
109                 /*
110                  * It's OK if an object went away during our iteration; this
111                  * could be due to a simultaneous repack. But anything else
112                  * we should abort, since we might then fail to mark objects
113                  * which should not be pruned.
114                  */
115                 if (errno == ENOENT)
116                         return 0;
117                 return error("unable to stat %s: %s",
118                              sha1_to_hex(sha1), strerror(errno));
119         }
120
121         add_recent_object(sha1, st.st_mtime, data);
122         return 0;
123 }
124
125 static int add_recent_packed(const unsigned char *sha1,
126                              struct packed_git *p, uint32_t pos,
127                              void *data)
128 {
129         struct object *obj = lookup_object(sha1);
130
131         if (obj && obj->flags & SEEN)
132                 return 0;
133         add_recent_object(sha1, p->mtime, data);
134         return 0;
135 }
136
137 int add_unseen_recent_objects_to_traversal(struct rev_info *revs,
138                                            unsigned long timestamp)
139 {
140         struct recent_data data;
141         int r;
142
143         data.revs = revs;
144         data.timestamp = timestamp;
145
146         r = for_each_loose_object(add_recent_loose, &data,
147                                   FOR_EACH_OBJECT_LOCAL_ONLY);
148         if (r)
149                 return r;
150         return for_each_packed_object(add_recent_packed, &data,
151                                       FOR_EACH_OBJECT_LOCAL_ONLY);
152 }
153
154 void mark_reachable_objects(struct rev_info *revs, int mark_reflog,
155                             unsigned long mark_recent,
156                             struct progress *progress)
157 {
158         struct connectivity_progress cp;
159
160         /*
161          * Set up revision parsing, and mark us as being interested
162          * in all object types, not just commits.
163          */
164         revs->tag_objects = 1;
165         revs->blob_objects = 1;
166         revs->tree_objects = 1;
167
168         /* Add all refs from the index file */
169         add_index_objects_to_pending(revs, 0);
170
171         /* Add all external refs */
172         for_each_ref(add_one_ref, revs);
173
174         /* detached HEAD is not included in the list above */
175         head_ref(add_one_ref, revs);
176
177         /* Add all reflog info */
178         if (mark_reflog)
179                 add_reflogs_to_pending(revs, 0);
180
181         cp.progress = progress;
182         cp.count = 0;
183
184         /*
185          * Set up the revision walk - this will move all commits
186          * from the pending list to the commit walking list.
187          */
188         if (prepare_revision_walk(revs))
189                 die("revision walk setup failed");
190         traverse_commit_list(revs, mark_commit, mark_object, &cp);
191
192         if (mark_recent) {
193                 revs->ignore_missing_links = 1;
194                 if (add_unseen_recent_objects_to_traversal(revs, mark_recent))
195                         die("unable to mark recent objects");
196                 if (prepare_revision_walk(revs))
197                         die("revision walk setup failed");
198                 traverse_commit_list(revs, mark_commit, mark_object, &cp);
199         }
200
201         display_progress(cp.progress, cp.count);
202 }