rebase --root: fix amending root commit messages
[git.git] / reachable.c
bloba6ea33a5db8b616420572cda4b857ac6d7d43cb1
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 #include "packfile.h"
13 #include "worktree.h"
14 #include "object-store.h"
16 struct connectivity_progress {
17 struct progress *progress;
18 unsigned long count;
21 static void update_progress(struct connectivity_progress *cp)
23 cp->count++;
24 if ((cp->count & 1023) == 0)
25 display_progress(cp->progress, cp->count);
28 static int add_one_ref(const char *path, const struct object_id *oid,
29 int flag, void *cb_data)
31 struct rev_info *revs = (struct rev_info *)cb_data;
32 struct object *object;
34 if ((flag & REF_ISSYMREF) && (flag & REF_ISBROKEN)) {
35 warning("symbolic ref is dangling: %s", path);
36 return 0;
39 object = parse_object_or_die(oid, path);
40 add_pending_object(revs, object, "");
42 return 0;
46 * The traversal will have already marked us as SEEN, so we
47 * only need to handle any progress reporting here.
49 static void mark_object(struct object *obj, const char *name, void *data)
51 update_progress(data);
54 static void mark_commit(struct commit *c, void *data)
56 mark_object(&c->object, NULL, data);
59 struct recent_data {
60 struct rev_info *revs;
61 timestamp_t timestamp;
64 static void add_recent_object(const struct object_id *oid,
65 timestamp_t mtime,
66 struct recent_data *data)
68 struct object *obj;
69 enum object_type type;
71 if (mtime <= data->timestamp)
72 return;
75 * We do not want to call parse_object here, because
76 * inflating blobs and trees could be very expensive.
77 * However, we do need to know the correct type for
78 * later processing, and the revision machinery expects
79 * commits and tags to have been parsed.
81 type = oid_object_info(oid, NULL);
82 if (type < 0)
83 die("unable to get object info for %s", oid_to_hex(oid));
85 switch (type) {
86 case OBJ_TAG:
87 case OBJ_COMMIT:
88 obj = parse_object_or_die(oid, NULL);
89 break;
90 case OBJ_TREE:
91 obj = (struct object *)lookup_tree(oid);
92 break;
93 case OBJ_BLOB:
94 obj = (struct object *)lookup_blob(oid);
95 break;
96 default:
97 die("unknown object type for %s: %s",
98 oid_to_hex(oid), type_name(type));
101 if (!obj)
102 die("unable to lookup %s", oid_to_hex(oid));
104 add_pending_object(data->revs, obj, "");
107 static int add_recent_loose(const struct object_id *oid,
108 const char *path, void *data)
110 struct stat st;
111 struct object *obj = lookup_object(oid->hash);
113 if (obj && obj->flags & SEEN)
114 return 0;
116 if (stat(path, &st) < 0) {
118 * It's OK if an object went away during our iteration; this
119 * could be due to a simultaneous repack. But anything else
120 * we should abort, since we might then fail to mark objects
121 * which should not be pruned.
123 if (errno == ENOENT)
124 return 0;
125 return error_errno("unable to stat %s", oid_to_hex(oid));
128 add_recent_object(oid, st.st_mtime, data);
129 return 0;
132 static int add_recent_packed(const struct object_id *oid,
133 struct packed_git *p, uint32_t pos,
134 void *data)
136 struct object *obj = lookup_object(oid->hash);
138 if (obj && obj->flags & SEEN)
139 return 0;
140 add_recent_object(oid, p->mtime, data);
141 return 0;
144 int add_unseen_recent_objects_to_traversal(struct rev_info *revs,
145 timestamp_t timestamp)
147 struct recent_data data;
148 int r;
150 data.revs = revs;
151 data.timestamp = timestamp;
153 r = for_each_loose_object(add_recent_loose, &data,
154 FOR_EACH_OBJECT_LOCAL_ONLY);
155 if (r)
156 return r;
157 return for_each_packed_object(add_recent_packed, &data,
158 FOR_EACH_OBJECT_LOCAL_ONLY);
161 void mark_reachable_objects(struct rev_info *revs, int mark_reflog,
162 timestamp_t mark_recent, struct progress *progress)
164 struct connectivity_progress cp;
167 * Set up revision parsing, and mark us as being interested
168 * in all object types, not just commits.
170 revs->tag_objects = 1;
171 revs->blob_objects = 1;
172 revs->tree_objects = 1;
174 /* Add all refs from the index file */
175 add_index_objects_to_pending(revs, 0);
177 /* Add all external refs */
178 for_each_ref(add_one_ref, revs);
180 /* detached HEAD is not included in the list above */
181 head_ref(add_one_ref, revs);
182 other_head_refs(add_one_ref, revs);
184 /* Add all reflog info */
185 if (mark_reflog)
186 add_reflogs_to_pending(revs, 0);
188 cp.progress = progress;
189 cp.count = 0;
192 * Set up the revision walk - this will move all commits
193 * from the pending list to the commit walking list.
195 if (prepare_revision_walk(revs))
196 die("revision walk setup failed");
197 traverse_commit_list(revs, mark_commit, mark_object, &cp);
199 if (mark_recent) {
200 revs->ignore_missing_links = 1;
201 if (add_unseen_recent_objects_to_traversal(revs, mark_recent))
202 die("unable to mark recent objects");
203 if (prepare_revision_walk(revs))
204 die("revision walk setup failed");
205 traverse_commit_list(revs, mark_commit, mark_object, &cp);
208 display_progress(cp.progress, cp.count);