8 static FILE *info_ref_fp;
10 static int add_info_ref(const char *path, const unsigned char *sha1)
12 struct object *o = parse_object(sha1);
14 fprintf(info_ref_fp, "%s %s\n", sha1_to_hex(sha1), path);
15 if (o->type == tag_type) {
16 o = deref_tag(o, path, 0);
18 fprintf(info_ref_fp, "%s %s^{}\n",
19 sha1_to_hex(o->sha1), path);
24 static int update_info_refs(int force)
26 char *path0 = strdup(git_path("info/refs"));
27 int len = strlen(path0);
28 char *path1 = xmalloc(len + 2);
31 strcpy(path1 + len, "+");
33 safe_create_leading_directories(path0);
34 info_ref_fp = fopen(path1, "w");
36 return error("unable to update %s", path0);
37 for_each_ref(add_info_ref);
46 static struct pack_info {
53 unsigned char (*head)[20];
56 static const char *objdir;
59 static struct object *parse_object_cheap(const unsigned char *sha1)
63 if ((o = parse_object(sha1)) == NULL)
65 if (o->type == commit_type) {
66 struct commit *commit = (struct commit *)o;
68 commit->buffer = NULL;
69 } else if (o->type == tree_type) {
70 struct tree *tree = (struct tree *)o;
71 struct tree_entry_list *e, *n;
72 for (e = tree->entries; e; e = n) {
83 static struct pack_info *find_pack_by_name(const char *name)
86 for (i = 0; i < num_pack; i++) {
87 struct packed_git *p = info[i]->p;
88 /* skip "/pack/" after ".git/objects" */
89 if (!strcmp(p->pack_name + objdirlen + 6, name))
95 static struct pack_info *find_pack_by_old_num(int old_num)
98 for (i = 0; i < num_pack; i++)
99 if (info[i]->old_num == old_num)
104 static int add_head_def(struct pack_info *this, unsigned char *sha1)
106 if (this->nr_alloc <= this->nr_heads) {
107 this->nr_alloc = alloc_nr(this->nr_alloc);
108 this->head = xrealloc(this->head, this->nr_alloc * 20);
110 memcpy(this->head[this->nr_heads++], sha1, 20);
114 /* Returns non-zero when we detect that the info in the
115 * old file is useless.
117 static int parse_pack_def(const char *line, int old_cnt)
119 struct pack_info *i = find_pack_by_name(line + 2);
121 i->old_num = old_cnt;
125 /* The file describes a pack that is no longer here */
130 /* Returns non-zero when we detect that the info in the old file is useless.
132 static int parse_head_def(char *line)
134 unsigned char sha1[20];
137 struct pack_info *this;
141 num = strtoul(cp, &ep, 10);
142 if (ep == cp || *ep++ != ' ')
143 return error("invalid input ix %s", line);
144 this = find_pack_by_old_num(num);
146 return 1; /* You know the drill. */
147 if (get_sha1_hex(ep, sha1) || ep[40] != ' ')
148 return error("invalid input sha1 %s (%s)", line, ep);
149 if ((o = parse_object_cheap(sha1)) == NULL)
150 return error("no such object: %s", line);
151 return add_head_def(this, sha1);
154 /* Returns non-zero when we detect that the info in the
155 * old file is useless.
157 static int read_pack_info_file(const char *infofile)
163 fp = fopen(infofile, "r");
165 return 1; /* nonexisting is not an error. */
167 while (fgets(line, sizeof(line), fp)) {
168 int len = strlen(line);
169 if (line[len-1] == '\n')
173 case 'P': /* P name */
174 if (parse_pack_def(line, old_cnt++))
177 case 'D': /* we used to emit D but that was misguided. */
180 case 'T': /* T ix sha1 type */
181 if (parse_head_def(line))
185 error("unrecognized: %s", line);
196 /* We sort the packs according to the date of the latest commit. That
197 * in turn indicates how young the pack is, and in general we would
198 * want to depend on younger packs.
200 static unsigned long get_latest_commit_date(struct packed_git *p)
202 unsigned char sha1[20];
204 int num = num_packed_objects(p);
206 unsigned long latest = 0;
208 for (i = 0; i < num; i++) {
209 if (nth_packed_object_sha1(p, i, sha1))
210 die("corrupt pack file %s?", p->pack_name);
211 if ((o = parse_object_cheap(sha1)) == NULL)
212 die("cannot parse %s", sha1_to_hex(sha1));
213 if (o->type == commit_type) {
214 struct commit *commit = (struct commit *)o;
215 if (latest < commit->date)
216 latest = commit->date;
222 static int compare_info(const void *a_, const void *b_)
224 struct pack_info * const* a = a_;
225 struct pack_info * const* b = b_;
227 if (0 <= (*a)->old_num && 0 <= (*b)->old_num)
228 /* Keep the order in the original */
229 return (*a)->old_num - (*b)->old_num;
230 else if (0 <= (*a)->old_num)
231 /* Only A existed in the original so B is obviously newer */
233 else if (0 <= (*b)->old_num)
234 /* The other way around. */
237 if ((*a)->latest < (*b)->latest)
239 else if ((*a)->latest == (*b)->latest)
245 static void init_pack_info(const char *infofile, int force)
247 struct packed_git *p;
251 objdir = get_object_directory();
252 objdirlen = strlen(objdir);
254 prepare_packed_git();
255 for (p = packed_git; p; p = p->next) {
256 /* we ignore things on alternate path since they are
257 * not available to the pullers in general.
259 if (strncmp(p->pack_name, objdir, objdirlen) ||
260 strncmp(p->pack_name + objdirlen, "/pack/", 6))
265 info = xcalloc(num_pack, sizeof(struct pack_info *));
266 for (i = 0, p = packed_git; p; p = p->next) {
267 if (strncmp(p->pack_name, objdir, objdirlen) ||
268 p->pack_name[objdirlen] != '/')
270 info[i] = xcalloc(1, sizeof(struct pack_info));
272 info[i]->old_num = -1;
276 if (infofile && !force)
277 stale = read_pack_info_file(infofile);
281 for (i = 0; i < num_pack; i++) {
283 info[i]->old_num = -1;
284 info[i]->nr_heads = 0;
286 if (info[i]->old_num < 0)
287 info[i]->latest = get_latest_commit_date(info[i]->p);
291 qsort(info, num_pack, sizeof(info[0]), compare_info);
292 for (i = 0; i < num_pack; i++)
293 info[i]->new_num = i;
296 static void write_pack_info_file(FILE *fp)
299 for (i = 0; i < num_pack; i++)
300 fprintf(fp, "P %s\n", info[i]->p->pack_name + objdirlen + 6);
301 for (i = 0; i < num_pack; i++) {
302 struct pack_info *this = info[i];
303 for (j = 0; j < this->nr_heads; j++) {
304 struct object *o = lookup_object(this->head[j]);
305 fprintf(fp, "T %1d %s %s\n",
306 i, sha1_to_hex(this->head[j]), o->type);
312 #define REFERENCED 01
315 static void show(struct object *o, int pack_ix)
318 * We are interested in objects that are not referenced,
320 if (o->flags & EMITTED)
323 if (!(o->flags & REFERENCED))
324 add_head_def(info[pack_ix], o->sha1);
328 static void find_pack_info_one(int pack_ix)
330 unsigned char sha1[20];
333 struct packed_git *p = info[pack_ix]->p;
334 int num = num_packed_objects(p);
336 /* Scan objects, clear flags from all the edge ones and
337 * internal ones, possibly marked in the previous round.
339 for (i = 0; i < num; i++) {
340 if (nth_packed_object_sha1(p, i, sha1))
341 die("corrupt pack file %s?", p->pack_name);
342 if ((o = lookup_object(sha1)) == NULL)
343 die("cannot parse %s", sha1_to_hex(sha1));
345 struct object_refs *refs = o->refs;
347 for (j = 0; j < refs->count; j++)
348 refs->ref[j]->flags = 0;
353 /* Mark all the referenced ones */
354 for (i = 0; i < num; i++) {
355 if (nth_packed_object_sha1(p, i, sha1))
356 die("corrupt pack file %s?", p->pack_name);
357 if ((o = lookup_object(sha1)) == NULL)
358 die("cannot find %s", sha1_to_hex(sha1));
360 struct object_refs *refs = o->refs;
362 for (j = 0; j < refs->count; j++)
363 refs->ref[j]->flags |= REFERENCED;
367 for (i = 0; i < num; i++) {
368 if (nth_packed_object_sha1(p, i, sha1))
369 die("corrupt pack file %s?", p->pack_name);
370 if ((o = lookup_object(sha1)) == NULL)
371 die("cannot find %s", sha1_to_hex(sha1));
377 static void find_pack_info(void)
380 for (i = 0; i < num_pack; i++) {
381 /* The packed objects are cast in stone, and a head
382 * in a pack will stay as head, so is the set of missing
383 * objects. If the repo has been reorganized and we
384 * are missing some packs available back then, we have
385 * already discarded the info read from the file, so
386 * we will find (old_num < 0) in that case.
388 if (0 <= info[i]->old_num)
390 find_pack_info_one(i);
394 static int update_info_packs(int force)
396 char infofile[PATH_MAX];
401 namelen = sprintf(infofile, "%s/info/packs", get_object_directory());
402 strcpy(name, infofile);
403 strcpy(name + namelen, "+");
405 init_pack_info(infofile, force);
408 safe_create_leading_directories(name);
409 fp = fopen(name, "w");
411 return error("cannot open %s", name);
412 write_pack_info_file(fp);
414 rename(name, infofile);
419 int update_server_info(int force)
421 /* We would add more dumb-server support files later,
422 * including index of available pack files and their
423 * intended audiences.
427 errs = errs | update_info_refs(force);
428 errs = errs | update_info_packs(force);
430 /* remove leftover rev-cache file if there is any */
431 unlink(git_path("info/rev-cache"));