summaryrefslogtreecommitdiff
path: root/reachable.c
blob: acac86ad3fae736a326774885b5f7380b03901bb (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
#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"
#include "progress.h"
#include "list-objects.h"

struct connectivity_progress {
	struct progress *progress;
	unsigned long count;
};

static void update_progress(struct connectivity_progress *cp)
{
	cp->count++;
	if ((cp->count & 1023) == 0)
		display_progress(cp->progress, cp->count);
}

static int add_one_ref(const char *path, const unsigned char *sha1, int flag, void *cb_data)
{
	struct object *object = parse_object_or_die(sha1, path);
	struct rev_info *revs = (struct rev_info *)cb_data;

	add_pending_object(revs, object, "");

	return 0;
}

/*
 * The traversal will have already marked us as SEEN, so we
 * only need to handle any progress reporting here.
 */
static void mark_object(struct object *obj, const struct name_path *path,
			const char *name, void *data)
{
	update_progress(data);
}

static void mark_commit(struct commit *c, void *data)
{
	mark_object(&c->object, NULL, NULL, data);
}

struct recent_data {
	struct rev_info *revs;
	unsigned long timestamp;
};

static void add_recent_object(const unsigned char *sha1,
			      unsigned long mtime,
			      struct recent_data *data)
{
	struct object *obj;
	enum object_type type;

	if (mtime <= data->timestamp)
		return;

	/*
	 * We do not want to call parse_object here, because
	 * inflating blobs and trees could be very expensive.
	 * However, we do need to know the correct type for
	 * later processing, and the revision machinery expects
	 * commits and tags to have been parsed.
	 */
	type = sha1_object_info(sha1, NULL);
	if (type < 0)
		die("unable to get object info for %s", sha1_to_hex(sha1));

	switch (type) {
	case OBJ_TAG:
	case OBJ_COMMIT:
		obj = parse_object_or_die(sha1, NULL);
		break;
	case OBJ_TREE:
		obj = (struct object *)lookup_tree(sha1);
		break;
	case OBJ_BLOB:
		obj = (struct object *)lookup_blob(sha1);
		break;
	default:
		die("unknown object type for %s: %s",
		    sha1_to_hex(sha1), typename(type));
	}

	if (!obj)
		die("unable to lookup %s", sha1_to_hex(sha1));

	add_pending_object(data->revs, obj, "");
}

static int add_recent_loose(const unsigned char *sha1,
			    const char *path, void *data)
{
	struct stat st;
	struct object *obj = lookup_object(sha1);

	if (obj && obj->flags & SEEN)
		return 0;

	if (stat(path, &st) < 0) {
		/*
		 * It's OK if an object went away during our iteration; this
		 * could be due to a simultaneous repack. But anything else
		 * we should abort, since we might then fail to mark objects
		 * which should not be pruned.
		 */
		if (errno == ENOENT)
			return 0;
		return error("unable to stat %s: %s",
			     sha1_to_hex(sha1), strerror(errno));
	}

	add_recent_object(sha1, st.st_mtime, data);
	return 0;
}

static int add_recent_packed(const unsigned char *sha1,
			     struct packed_git *p, uint32_t pos,
			     void *data)
{
	struct object *obj = lookup_object(sha1);

	if (obj && obj->flags & SEEN)
		return 0;
	add_recent_object(sha1, p->mtime, data);
	return 0;
}

int add_unseen_recent_objects_to_traversal(struct rev_info *revs,
					   unsigned long timestamp)
{
	struct recent_data data;
	int r;

	data.revs = revs;
	data.timestamp = timestamp;

	r = for_each_loose_object(add_recent_loose, &data,
				  FOR_EACH_OBJECT_LOCAL_ONLY);
	if (r)
		return r;
	return for_each_packed_object(add_recent_packed, &data,
				      FOR_EACH_OBJECT_LOCAL_ONLY);
}

void mark_reachable_objects(struct rev_info *revs, int mark_reflog,
			    unsigned long mark_recent,
			    struct progress *progress)
{
	struct connectivity_progress cp;
	struct each_ref_fn_sha1_adapter wrapped_add_one_ref =
		{add_one_ref, revs};

	/*
	 * 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_index_objects_to_pending(revs, 0);

	/* Add all external refs */
	for_each_ref(each_ref_fn_adapter, &wrapped_add_one_ref);

	/* detached HEAD is not included in the list above */
	head_ref(each_ref_fn_adapter, &wrapped_add_one_ref);

	/* Add all reflog info */
	if (mark_reflog)
		add_reflogs_to_pending(revs, 0);

	cp.progress = progress;
	cp.count = 0;

	/*
	 * Set up the revision walk - this will move all commits
	 * from the pending list to the commit walking list.
	 */
	if (prepare_revision_walk(revs))
		die("revision walk setup failed");
	traverse_commit_list(revs, mark_commit, mark_object, &cp);

	if (mark_recent) {
		revs->ignore_missing_links = 1;
		if (add_unseen_recent_objects_to_traversal(revs, mark_recent))
			die("unable to mark recent objects");
		if (prepare_revision_walk(revs))
			die("revision walk setup failed");
		traverse_commit_list(revs, mark_commit, mark_object, &cp);
	}

	display_progress(cp.progress, cp.count);
}