Fix git-resolve-script.
[git/git.git] / fsck-cache.c
CommitLineData
20222118
LT
1#include <sys/types.h>
2#include <dirent.h>
3
4b182421 4#include "cache.h"
ff5ebe39
DB
5#include "commit.h"
6#include "tree.h"
7#include "blob.h"
c418eda4 8#include "tag.h"
ff5ebe39
DB
9
10#define REACHABLE 0x0001
d9839e03 11
ab7df187 12static int show_root = 0;
889262ea 13static int show_tags = 0;
d9839e03 14static int show_unreachable = 0;
ae7c0c92 15static int keep_cache_objects = 0;
d9839e03
LT
16static unsigned char head_sha1[20];
17
8ba0bbb2
LT
18static void check_connectivity(void)
19{
20 int i;
21
8ba0bbb2 22 /* Look up all the requirements, warn about missing objects.. */
ff5ebe39
DB
23 for (i = 0; i < nr_objs; i++) {
24 struct object *obj = objs[i];
c418eda4 25 struct object_list *refs;
8ba0bbb2 26
3a6a23e6
LT
27 if (!obj->parsed) {
28 printf("missing %s %s\n", obj->type, sha1_to_hex(obj->sha1));
29 continue;
30 }
31
32 for (refs = obj->refs; refs; refs = refs->next) {
33 if (refs->item->parsed)
34 continue;
35 printf("broken link from %7s %s\n",
36 obj->type, sha1_to_hex(obj->sha1));
37 printf(" to %7s %s\n",
aa034134 38 refs->item->type, sha1_to_hex(refs->item->sha1));
3a6a23e6
LT
39 }
40
41 /* Don't bother with tag reachability. */
42 if (obj->type == tag_type)
43 continue;
44
ff5ebe39 45 if (show_unreachable && !(obj->flags & REACHABLE)) {
f43b8abc 46 printf("unreachable %s %s\n", obj->type, sha1_to_hex(obj->sha1));
8ba0bbb2 47 continue;
d9839e03 48 }
8ba0bbb2 49
ff5ebe39
DB
50 if (!obj->used) {
51 printf("dangling %s %s\n", obj->type,
52 sha1_to_hex(obj->sha1));
d9839e03 53 }
8ba0bbb2
LT
54 }
55}
56
85003492
LT
57/*
58 * The entries in a tree are ordered in the _path_ order,
59 * which means that a directory entry is ordered by adding
60 * a slash to the end of it.
61 *
62 * So a directory called "a" is ordered _after_ a file
63 * called "a.c", because "a/" sorts after "a.c".
64 */
65static int verify_ordered(struct tree_entry_list *a, struct tree_entry_list *b)
66{
67 int len1 = strlen(a->name);
68 int len2 = strlen(b->name);
69 int len = len1 < len2 ? len1 : len2;
70 unsigned char c1, c2;
71 int cmp;
72
73 cmp = memcmp(a->name, b->name, len);
74 if (cmp < 0)
75 return 0;
76 if (cmp > 0)
77 return -1;
78
79 /*
80 * Ok, the first <len> characters are the same.
81 * Now we need to order the next one, but turn
82 * a '\0' into a '/' for a directory entry.
83 */
84 c1 = a->name[len];
85 c2 = b->name[len];
86 if (!c1 && a->directory)
87 c1 = '/';
88 if (!c2 && b->directory)
89 c2 = '/';
90 return c1 < c2 ? 0 : -1;
91}
92
c418eda4 93static int fsck_tree(struct tree *item)
20222118 94{
85003492
LT
95 int has_full_path = 0;
96 struct tree_entry_list *entry, *last;
97
98 last = NULL;
99 for (entry = item->entries; entry; entry = entry->next) {
100 if (strchr(entry->name, '/'))
101 has_full_path = 1;
102
103 if (last) {
104 if (verify_ordered(last, entry) < 0) {
105 fprintf(stderr, "tree %s not ordered\n",
106 sha1_to_hex(item->object.sha1));
107 return -1;
108 }
109 }
110
111 last = entry;
112 }
113
114 if (has_full_path) {
ff5ebe39 115 fprintf(stderr, "warning: fsck-cache: tree %s "
c418eda4
DB
116 "has full pathnames in it\n",
117 sha1_to_hex(item->object.sha1));
1ea34e36 118 }
85003492 119
59c1e249 120 return 0;
1ea34e36
LT
121}
122
c418eda4 123static int fsck_commit(struct commit *commit)
1ea34e36 124{
ff5ebe39 125 if (!commit->tree)
1ea34e36 126 return -1;
ab7df187 127 if (!commit->parents && show_root)
c418eda4 128 printf("root %s\n", sha1_to_hex(commit->object.sha1));
e6948b6d 129 if (!commit->date)
c418eda4
DB
130 printf("bad commit date in %s\n",
131 sha1_to_hex(commit->object.sha1));
4728b861
LT
132 return 0;
133}
134
c418eda4 135static int fsck_tag(struct tag *tag)
ec4465ad 136{
92d4c85d
LT
137 struct object *tagged = tag->tagged;
138
139 if (!tagged) {
140 printf("bad object in tag %s\n", sha1_to_hex(tag->object.sha1));
141 return -1;
142 }
889262ea
LT
143 if (!show_tags)
144 return 0;
145
92d4c85d
LT
146 printf("tagged %s %s", tagged->type, sha1_to_hex(tagged->sha1));
147 printf(" (%s) in %s\n", tag->tag, sha1_to_hex(tag->object.sha1));
ff5ebe39 148 return 0;
20222118
LT
149}
150
7e8c174a 151static int fsck_sha1(unsigned char *sha1)
20222118 152{
7e8c174a
LT
153 struct object *obj = parse_object(sha1);
154 if (!obj)
155 return -1;
156 if (obj->type == blob_type)
157 return 0;
158 if (obj->type == tree_type)
159 return fsck_tree((struct tree *) obj);
160 if (obj->type == commit_type)
161 return fsck_commit((struct commit *) obj);
162 if (obj->type == tag_type)
163 return fsck_tag((struct tag *) obj);
164 return -1;
165}
166
167/*
168 * This is the sorting chunk size: make it reasonably
169 * big so that we can sort well..
170 */
171#define MAX_SHA1_ENTRIES (1024)
172
173struct sha1_entry {
174 unsigned long ino;
20222118 175 unsigned char sha1[20];
7e8c174a
LT
176};
177
178static struct {
179 unsigned long nr;
180 struct sha1_entry *entry[MAX_SHA1_ENTRIES];
181} sha1_list;
182
183static int ino_compare(const void *_a, const void *_b)
184{
185 const struct sha1_entry *a = _a, *b = _b;
186 unsigned long ino1 = a->ino, ino2 = b->ino;
187 return ino1 < ino2 ? -1 : ino1 > ino2 ? 1 : 0;
188}
189
190static void fsck_sha1_list(void)
191{
192 int i, nr = sha1_list.nr;
193
194 qsort(sha1_list.entry, nr, sizeof(struct sha1_entry *), ino_compare);
195 for (i = 0; i < nr; i++) {
196 struct sha1_entry *entry = sha1_list.entry[i];
197 unsigned char *sha1 = entry->sha1;
198
199 sha1_list.entry[i] = NULL;
200 if (fsck_sha1(sha1) < 0)
201 fprintf(stderr, "bad sha1 entry '%s'\n", sha1_to_hex(sha1));
202 free(entry);
20222118 203 }
7e8c174a
LT
204 sha1_list.nr = 0;
205}
206
207static void add_sha1_list(unsigned char *sha1, unsigned long ino)
208{
209 struct sha1_entry *entry = xmalloc(sizeof(*entry));
210 int nr;
211
212 entry->ino = ino;
213 memcpy(entry->sha1, sha1, 20);
214 nr = sha1_list.nr;
215 if (nr == MAX_SHA1_ENTRIES) {
216 fsck_sha1_list();
217 nr = 0;
218 }
219 sha1_list.entry[nr] = entry;
220 sha1_list.nr = ++nr;
20222118
LT
221}
222
223static int fsck_dir(int i, char *path)
224{
225 DIR *dir = opendir(path);
226 struct dirent *de;
227
228 if (!dir) {
2de381f9 229 return error("missing sha1 directory '%s'", path);
20222118
LT
230 }
231
232 while ((de = readdir(dir)) != NULL) {
233 char name[100];
7e8c174a 234 unsigned char sha1[20];
20222118
LT
235 int len = strlen(de->d_name);
236
237 switch (len) {
238 case 2:
239 if (de->d_name[1] != '.')
240 break;
241 case 1:
242 if (de->d_name[0] != '.')
243 break;
244 continue;
245 case 38:
246 sprintf(name, "%02x", i);
247 memcpy(name+2, de->d_name, len+1);
7e8c174a
LT
248 if (get_sha1_hex(name, sha1) < 0)
249 break;
250 add_sha1_list(sha1, de->d_ino);
251 continue;
20222118
LT
252 }
253 fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
254 }
255 closedir(dir);
256 return 0;
257}
258
259int main(int argc, char **argv)
260{
bcee6fd8 261 int i, heads;
20222118
LT
262 char *sha1_dir;
263
889262ea
LT
264 for (i = 1; i < argc; i++) {
265 const char *arg = argv[i];
266
267 if (!strcmp(arg, "--unreachable")) {
268 show_unreachable = 1;
269 continue;
270 }
271 if (!strcmp(arg, "--tags")) {
272 show_tags = 1;
273 continue;
274 }
ab7df187
LT
275 if (!strcmp(arg, "--root")) {
276 show_root = 1;
277 continue;
278 }
ae7c0c92
JH
279 if (!strcmp(arg, "--cache")) {
280 keep_cache_objects = 1;
281 continue;
282 }
889262ea 283 if (*arg == '-')
ae7c0c92 284 usage("fsck-cache [--tags] [[--unreachable] [--cache] <head-sha1>*]");
889262ea
LT
285 }
286
bcee6fd8
LT
287 sha1_dir = getenv(DB_ENVIRONMENT) ? : DEFAULT_DB_ENVIRONMENT;
288 for (i = 0; i < 256; i++) {
289 static char dir[4096];
290 sprintf(dir, "%s/%02x", sha1_dir, i);
291 fsck_dir(i, dir);
292 }
7e8c174a 293 fsck_sha1_list();
bcee6fd8
LT
294
295 heads = 0;
d9839e03 296 for (i = 1; i < argc; i++) {
889262ea
LT
297 const char *arg = argv[i];
298
299 if (*arg == '-')
d9839e03 300 continue;
889262ea 301
3c249c95 302 if (!get_sha1(arg, head_sha1)) {
770896e5 303 struct object *obj = lookup_object(head_sha1);
e1a1388d 304
770896e5
LT
305 /* Error is printed by lookup_object(). */
306 if (!obj)
e1a1388d
JF
307 continue;
308
ff5ebe39
DB
309 obj->used = 1;
310 mark_reachable(obj, REACHABLE);
bcee6fd8 311 heads++;
d9839e03
LT
312 continue;
313 }
889262ea 314 error("expected sha1, got %s", arg);
d9839e03 315 }
d9839e03 316
ae7c0c92
JH
317 if (keep_cache_objects) {
318 int i;
319 read_cache();
320 for (i = 0; i < active_nr; i++) {
321 struct blob *blob = lookup_blob(active_cache[i]->sha1);
322 struct object *obj;
323 if (!blob)
324 continue;
325 obj = &blob->object;
326 obj->used = 1;
327 mark_reachable(obj, REACHABLE);
328 }
329 }
330
331 if (!heads && !keep_cache_objects) {
bcee6fd8 332 if (show_unreachable) {
ae7c0c92 333 fprintf(stderr, "unable to do reachability without a head nor --cache\n");
bcee6fd8
LT
334 show_unreachable = 0;
335 }
ae7c0c92
JH
336 if (!heads)
337 fprintf(stderr, "expect dangling commits - potential heads - due to lack of head information\n");
20222118 338 }
bcee6fd8 339
8ba0bbb2 340 check_connectivity();
20222118
LT
341 return 0;
342}