summaryrefslogtreecommitdiff
path: root/builtin-prune.c
blob: 89ec7f1426d3f5d02486e3148b0c568edbe15300 (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
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
#include "cache.h"
#include "refs.h"
#include "tag.h"
#include "commit.h"
#include "tree.h"
#include "blob.h"
#include "tree-walk.h"
#include "diff.h"
#include "revision.h"
#include "builtin.h"
#include "cache-tree.h"
 
static const char prune_usage[] = "git-prune [-n]";
static int show_only = 0;
static struct rev_info revs;
 
static int prune_object(char *path, const char *filename, const unsigned char *sha1)
{
	if (show_only) {
		printf("would prune %s/%s\n", path, filename);
		return 0;
	}
	unlink(mkpath("%s/%s", path, filename));
	rmdir(path);
	return 0;
}
 
static int prune_dir(int i, char *path)
{
	DIR *dir = opendir(path);
	struct dirent *de;
 
	if (!dir)
		return 0;
 
	while ((de = readdir(dir)) != NULL) {
		char name[100];
		unsigned char sha1[20];
		int len = strlen(de->d_name);
 
		switch (len) {
		case 2:
			if (de->d_name[1] != '.')
				break;
		case 1:
			if (de->d_name[0] != '.')
				break;
			continue;
		case 38:
			sprintf(name, "%02x", i);
			memcpy(name+2, de->d_name, len+1);
			if (get_sha1_hex(name, sha1) < 0)
				break;
 
			/*
			 * Do we know about this object?
			 * It must have been reachable
			 */
			if (lookup_object(sha1))
				continue;
 
			prune_object(path, de->d_name, sha1);
			continue;
		}
		fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
	}
	closedir(dir);
	return 0;
}
 
static void prune_object_dir(const char *path)
{
	int i;
	for (i = 0; i < 256; i++) {
		static char dir[4096];
		sprintf(dir, "%s/%02x", path, i);
		prune_dir(i, dir);
	}
}
 
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_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 = strdup(name);
	add_object(obj, p, path, name);
	me.up = path;
	me.elem = name;
	me.elem_len = strlen(name);
 
	desc.buf = tree->buffer;
	desc.size = tree->size;
 
	while (tree_entry(&desc, &entry)) {
		if (S_ISDIR(entry.mode))
			process_tree(lookup_tree(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));
	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_ref(const char *path, const unsigned char *sha1)
{
	struct object *object = parse_object(sha1);
	if (!object)
		die("bad object ref: %s:%s", path, sha1_to_hex(sha1));
	add_pending_object(&revs, object, "");
	return 0;
}
 
static void add_one_tree(const unsigned char *sha1)
{
	struct tree *tree = lookup_tree(sha1);
	add_pending_object(&revs, &tree->object, "");
}
 
static void add_cache_tree(struct cache_tree *it)
{
	int i;
 
	if (it->entry_count >= 0)
		add_one_tree(it->sha1);
	for (i = 0; i < it->subtree_nr; i++)
		add_cache_tree(it->down[i]->cache_tree);
}
 
static void add_cache_refs(void)
{
	int i;
 
	read_cache();
	for (i = 0; i < active_nr; i++) {
		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);
}
 
int cmd_prune(int argc, const char **argv, const char *prefix)
{
	int i;
 
	for (i = 1; i < argc; i++) {
		const char *arg = argv[i];
		if (!strcmp(arg, "-n")) {
			show_only = 1;
			continue;
		}
		usage(prune_usage);
	}
 
	/*
	 * Set up revision parsing, and mark us as being interested
	 * in all object types, not just commits.
	 */
	init_revisions(&revs, prefix);
	revs.tag_objects = 1;
	revs.blob_objects = 1;
	revs.tree_objects = 1;
 
	/* Add all external refs */
	for_each_ref(add_one_ref);
 
	/* Add all refs from the index file */
	add_cache_refs();
 
	/*
	 * 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);
 
	prune_object_dir(get_object_directory());
 
	return 0;
}