summaryrefslogtreecommitdiff
path: root/reachable.c
blob: 11499a60c4202ba29b2dfc8bf1e6536343dfed4c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
#include "cache.h"
#include "refs.h"
#include "tag.h"
#include "commit.h"
#include "blob.h"
#include "diff.h"
#include "revision.h"
#include "reachable.h"
#include "cache-tree.h"
 
static void process_blob(struct blob *blob,
			 struct object_array *p,
			 struct name_path *path,
			 const char *name)
{
	struct object *obj = &blob->object;
 
	if (obj->flags & SEEN)
		return;
	obj->flags |= SEEN;
	/* Nothing to do, really .. The blob lookup was the important part */
}
 
static void process_gitlink(const unsigned char *sha1,
			    struct object_array *p,
			    struct name_path *path,
			    const char *name)
{
	/* I don't think we want to recurse into this, really. */
}
 
static void process_tree(struct tree *tree,
			 struct object_array *p,
			 struct name_path *path,
			 const char *name)
{
	struct object *obj = &tree->object;
	struct tree_desc desc;
	struct name_entry entry;
	struct name_path me;
 
	if (obj->flags & SEEN)
		return;
	obj->flags |= SEEN;
	if (parse_tree(tree) < 0)
		die("bad tree object %s", sha1_to_hex(obj->sha1));
	name = xstrdup(name);
	add_object(obj, p, path, name);
	me.up = path;
	me.elem = name;
	me.elem_len = strlen(name);
 
	init_tree_desc(&desc, tree->buffer, tree->size);
 
	while (tree_entry(&desc, &entry)) {
		if (S_ISDIR(entry.mode))
			process_tree(lookup_tree(entry.sha1), p, &me, entry.path);
		else if (S_ISGITLINK(entry.mode))
			process_gitlink(entry.sha1, p, &me, entry.path);
		else
			process_blob(lookup_blob(entry.sha1), p, &me, entry.path);
	}
	free(tree->buffer);
	tree->buffer = NULL;
}
 
static void process_tag(struct tag *tag, struct object_array *p, const char *name)
{
	struct object *obj = &tag->object;
	struct name_path me;
 
	if (obj->flags & SEEN)
		return;
	obj->flags |= SEEN;
 
	me.up = NULL;
	me.elem = "tag:/";
	me.elem_len = 5;
 
	if (parse_tag(tag) < 0)
		die("bad tag object %s", sha1_to_hex(obj->sha1));
	if (tag->tagged)
		add_object(tag->tagged, p, NULL, name);
}
 
static void walk_commit_list(struct rev_info *revs)
{
	int i;
	struct commit *commit;
	struct object_array objects = { 0, 0, NULL };
 
	/* Walk all commits, process their trees */
	while ((commit = get_revision(revs)) != NULL)
		process_tree(commit->tree, &objects, NULL, "");
 
	/* Then walk all the pending objects, recursively processing them too */
	for (i = 0; i < revs->pending.nr; i++) {
		struct object_array_entry *pending = revs->pending.objects + i;
		struct object *obj = pending->item;
		const char *name = pending->name;
		if (obj->type == OBJ_TAG) {
			process_tag((struct tag *) obj, &objects, name);
			continue;
		}
		if (obj->type == OBJ_TREE) {
			process_tree((struct tree *)obj, &objects, NULL, name);
			continue;
		}
		if (obj->type == OBJ_BLOB) {
			process_blob((struct blob *)obj, &objects, NULL, name);
			continue;
		}
		die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
	}
}
 
static int add_one_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
		const char *email, unsigned long timestamp, int tz,
		const char *message, void *cb_data)
{
	struct object *object;
	struct rev_info *revs = (struct rev_info *)cb_data;
 
	object = parse_object(osha1);
	if (object)
		add_pending_object(revs, object, "");
	object = parse_object(nsha1);
	if (object)
		add_pending_object(revs, object, "");
	return 0;
}
 
static int add_one_ref(const char *path, const unsigned char *sha1, int flag, void *cb_data)
{
	struct object *object = parse_object(sha1);
	struct rev_info *revs = (struct rev_info *)cb_data;
 
	if (!object)
		die("bad object ref: %s:%s", path, sha1_to_hex(sha1));
	add_pending_object(revs, object, "");
 
	return 0;
}
 
static int add_one_reflog(const char *path, const unsigned char *sha1, int flag, void *cb_data)
{
	for_each_reflog_ent(path, add_one_reflog_ent, cb_data);
	return 0;
}
 
static void add_one_tree(const unsigned char *sha1, struct rev_info *revs)
{
	struct tree *tree = lookup_tree(sha1);
	if (tree)
		add_pending_object(revs, &tree->object, "");
}
 
static void add_cache_tree(struct cache_tree *it, struct rev_info *revs)
{
	int i;
 
	if (it->entry_count >= 0)
		add_one_tree(it->sha1, revs);
	for (i = 0; i < it->subtree_nr; i++)
		add_cache_tree(it->down[i]->cache_tree, revs);
}
 
static void add_cache_refs(struct rev_info *revs)
{
	int i;
 
	read_cache();
	for (i = 0; i < active_nr; i++) {
		/*
		 * The index can contain blobs and GITLINKs, GITLINKs are hashes
		 * that don't actually point to objects in the repository, it's
		 * almost guaranteed that they are NOT blobs, so we don't call
		 * lookup_blob() on them, to avoid populating the hash table
		 * with invalid information
		 */
		if (S_ISGITLINK(ntohl(active_cache[i]->ce_mode)))
			continue;
 
		lookup_blob(active_cache[i]->sha1);
		/*
		 * We could add the blobs to the pending list, but quite
		 * frankly, we don't care. Once we've looked them up, and
		 * added them as objects, we've really done everything
		 * there is to do for a blob
		 */
	}
	if (active_cache_tree)
		add_cache_tree(active_cache_tree, revs);
}
 
void mark_reachable_objects(struct rev_info *revs, int mark_reflog)
{
	/*
	 * Set up revision parsing, and mark us as being interested
	 * in all object types, not just commits.
	 */
	revs->tag_objects = 1;
	revs->blob_objects = 1;
	revs->tree_objects = 1;
 
	/* Add all refs from the index file */
	add_cache_refs(revs);
 
	/* Add all external refs */
	for_each_ref(add_one_ref, revs);
 
	/* Add all reflog info */
	if (mark_reflog)
		for_each_reflog(add_one_reflog, revs);
 
	/*
	 * Set up the revision walk - this will move all commits
	 * from the pending list to the commit walking list.
	 */
	prepare_revision_walk(revs);
	walk_commit_list(revs);
}