4c2431f0b0b7ee017d108e6bd2af8e4f52bffdbb
1 /*
2 Format of STDIN stream:
4 stream ::= cmd*;
6 cmd ::= new_blob
7 | new_branch
8 | new_commit
9 | new_tag
10 ;
12 new_blob ::= 'blob' lf
13 mark?
14 file_content;
15 file_content ::= data;
17 new_branch ::= 'branch' sp ref_str lf
18 ('from' sp (ref_str | hexsha1 | sha1exp_str | idnum) lf)?
19 lf;
21 new_commit ::= 'commit' sp ref_str lf
22 mark?
23 ('author' sp name '<' email '>' ts tz lf)?
24 'committer' sp name '<' email '>' ts tz lf
25 commit_msg
26 file_change*
27 lf;
28 commit_msg ::= data;
30 file_change ::= 'M' sp mode sp (hexsha1 | idnum) sp path_str lf
31 | 'D' sp path_str lf
32 ;
33 mode ::= '644' | '755';
35 new_tag ::= 'tag' sp tag_str lf
36 'from' sp (ref_str | hexsha1 | sha1exp_str | idnum) lf
37 'tagger' sp name '<' email '>' ts tz lf
38 tag_msg;
39 tag_msg ::= data;
41 # note: the first idnum in a stream should be 1 and subsequent
42 # idnums should not have gaps between values as this will cause
43 # the stream parser to reserve space for the gapped values. An
44 # idnum can be updated in the future to a new object by issuing
45 # a new mark directive with the old idnum.
46 #
47 mark ::= 'mark' sp idnum lf;
49 # note: declen indicates the length of binary_data in bytes.
50 # declen does not include the lf preceeding or trailing the
51 # binary data.
52 #
53 data ::= 'data' sp declen lf
54 binary_data
55 lf;
57 # note: quoted strings are C-style quoting supporting \c for
58 # common escapes of 'c' (e..g \n, \t, \\, \") or \nnn where nnn
59 # is the signed byte value in octal. Note that the only
60 # characters which must actually be escaped to protect the
61 # stream formatting is: \, " and LF. Otherwise these values
62 # are UTF8.
63 #
64 ref_str ::= ref | '"' quoted(ref) '"' ;
65 sha1exp_str ::= sha1exp | '"' quoted(sha1exp) '"' ;
66 tag_str ::= tag | '"' quoted(tag) '"' ;
67 path_str ::= path | '"' quoted(path) '"' ;
69 declen ::= # unsigned 32 bit value, ascii base10 notation;
70 binary_data ::= # file content, not interpreted;
72 sp ::= # ASCII space character;
73 lf ::= # ASCII newline (LF) character;
75 # note: a colon (':') must precede the numerical value assigned to
76 # an idnum. This is to distinguish it from a ref or tag name as
77 # GIT does not permit ':' in ref or tag strings.
78 #
79 idnum ::= ':' declen;
80 path ::= # GIT style file path, e.g. "a/b/c";
81 ref ::= # GIT ref name, e.g. "refs/heads/MOZ_GECKO_EXPERIMENT";
82 tag ::= # GIT tag name, e.g. "FIREFOX_1_5";
83 sha1exp ::= # Any valid GIT SHA1 expression;
84 hexsha1 ::= # SHA1 in hexadecimal format;
86 # note: name and email are UTF8 strings, however name must not
87 # contain '<' or lf and email must not contain any of the
88 # following: '<', '>', lf.
89 #
90 name ::= # valid GIT author/committer name;
91 email ::= # valid GIT author/committer email;
92 ts ::= # time since the epoch in seconds, ascii base10 notation;
93 tz ::= # GIT style timezone;
94 */
96 #include "builtin.h"
97 #include "cache.h"
98 #include "object.h"
99 #include "blob.h"
100 #include "tree.h"
101 #include "delta.h"
102 #include "pack.h"
103 #include "refs.h"
104 #include "csum-file.h"
105 #include "strbuf.h"
106 #include "quote.h"
108 struct object_entry
109 {
110 struct object_entry *next;
111 enum object_type type;
112 unsigned long offset;
113 unsigned char sha1[20];
114 };
116 struct object_entry_pool
117 {
118 struct object_entry_pool *next_pool;
119 struct object_entry *next_free;
120 struct object_entry *end;
121 struct object_entry entries[FLEX_ARRAY]; /* more */
122 };
124 struct last_object
125 {
126 void *data;
127 unsigned int len;
128 unsigned int depth;
129 unsigned char sha1[20];
130 };
132 struct mem_pool
133 {
134 struct mem_pool *next_pool;
135 char *next_free;
136 char *end;
137 char space[FLEX_ARRAY]; /* more */
138 };
140 struct atom_str
141 {
142 struct atom_str *next_atom;
143 int str_len;
144 char str_dat[FLEX_ARRAY]; /* more */
145 };
147 struct tree_content;
148 struct tree_entry
149 {
150 struct tree_content *tree;
151 struct atom_str* name;
152 unsigned int mode;
153 unsigned char sha1[20];
154 };
156 struct tree_content
157 {
158 unsigned int entry_capacity; /* must match avail_tree_content */
159 unsigned int entry_count;
160 struct tree_entry *entries[FLEX_ARRAY]; /* more */
161 };
163 struct avail_tree_content
164 {
165 unsigned int entry_capacity; /* must match tree_content */
166 struct avail_tree_content *next_avail;
167 };
169 struct branch
170 {
171 struct branch *table_next_branch;
172 struct branch *active_next_branch;
173 const char *name;
174 unsigned long last_commit;
175 struct tree_entry branch_tree;
176 unsigned char sha1[20];
177 };
180 /* Stats and misc. counters */
181 static int max_depth = 10;
182 static unsigned long alloc_count;
183 static unsigned long branch_count;
184 static unsigned long object_count;
185 static unsigned long duplicate_count;
186 static unsigned long object_count_by_type[9];
187 static unsigned long duplicate_count_by_type[9];
189 /* Memory pools */
190 static size_t mem_pool_alloc = 2*1024*1024 - sizeof(struct mem_pool);
191 static size_t total_allocd;
192 static struct mem_pool *mem_pool;
194 /* Atom management */
195 static unsigned int atom_table_sz = 4451;
196 static unsigned int atom_cnt;
197 static struct atom_str **atom_table;
199 /* The .pack file being generated */
200 static int pack_fd;
201 static unsigned long pack_offset;
202 static unsigned char pack_sha1[20];
204 /* Table of objects we've written. */
205 static unsigned int object_entry_alloc = 1000;
206 static struct object_entry_pool *blocks;
207 static struct object_entry *object_table[1 << 16];
209 /* Our last blob */
210 static struct last_object last_blob;
212 /* Tree management */
213 static unsigned int tree_entry_alloc = 1000;
214 static void *avail_tree_entry;
215 static unsigned int avail_tree_table_sz = 100;
216 static struct avail_tree_content **avail_tree_table;
218 /* Branch data */
219 static unsigned int max_active_branches = 5;
220 static unsigned int cur_active_branches;
221 static unsigned int branch_table_sz = 1039;
222 static struct branch **branch_table;
223 static struct branch *active_branches;
225 /* Input stream parsing */
226 static struct strbuf command_buf;
227 static unsigned long command_mark;
230 static void alloc_objects(int cnt)
231 {
232 struct object_entry_pool *b;
234 b = xmalloc(sizeof(struct object_entry_pool)
235 + cnt * sizeof(struct object_entry));
236 b->next_pool = blocks;
237 b->next_free = b->entries;
238 b->end = b->entries + cnt;
239 blocks = b;
240 alloc_count += cnt;
241 }
243 static struct object_entry* new_object(unsigned char *sha1)
244 {
245 struct object_entry *e;
247 if (blocks->next_free == blocks->end)
248 alloc_objects(object_entry_alloc);
250 e = blocks->next_free++;
251 memcpy(e->sha1, sha1, sizeof(e->sha1));
252 return e;
253 }
255 static struct object_entry* find_object(unsigned char *sha1)
256 {
257 unsigned int h = sha1[0] << 8 | sha1[1];
258 struct object_entry *e;
259 for (e = object_table[h]; e; e = e->next)
260 if (!memcmp(sha1, e->sha1, sizeof(e->sha1)))
261 return e;
262 return NULL;
263 }
265 static struct object_entry* insert_object(unsigned char *sha1)
266 {
267 unsigned int h = sha1[0] << 8 | sha1[1];
268 struct object_entry *e = object_table[h];
269 struct object_entry *p = NULL;
271 while (e) {
272 if (!memcmp(sha1, e->sha1, sizeof(e->sha1)))
273 return e;
274 p = e;
275 e = e->next;
276 }
278 e = new_object(sha1);
279 e->next = NULL;
280 e->offset = 0;
281 if (p)
282 p->next = e;
283 else
284 object_table[h] = e;
285 return e;
286 }
288 static unsigned int hc_str(const char *s, size_t len)
289 {
290 unsigned int r = 0;
291 while (len-- > 0)
292 r = r * 31 + *s++;
293 return r;
294 }
296 static void* pool_alloc(size_t len)
297 {
298 struct mem_pool *p;
299 void *r;
301 for (p = mem_pool; p; p = p->next_pool)
302 if ((p->end - p->next_free >= len))
303 break;
305 if (!p) {
306 if (len >= (mem_pool_alloc/2)) {
307 total_allocd += len;
308 return xmalloc(len);
309 }
310 total_allocd += sizeof(struct mem_pool) + mem_pool_alloc;
311 p = xmalloc(sizeof(struct mem_pool) + mem_pool_alloc);
312 p->next_pool = mem_pool;
313 p->next_free = p->space;
314 p->end = p->next_free + mem_pool_alloc;
315 mem_pool = p;
316 }
318 r = p->next_free;
319 p->next_free += len;
320 return r;
321 }
323 static void* pool_calloc(size_t count, size_t size)
324 {
325 size_t len = count * size;
326 void *r = pool_alloc(len);
327 memset(r, 0, len);
328 return r;
329 }
331 static char* pool_strdup(const char *s)
332 {
333 char *r = pool_alloc(strlen(s) + 1);
334 strcpy(r, s);
335 return r;
336 }
338 static struct atom_str* to_atom(const char *s, size_t len)
339 {
340 unsigned int hc = hc_str(s, len) % atom_table_sz;
341 struct atom_str *c;
343 for (c = atom_table[hc]; c; c = c->next_atom)
344 if (c->str_len == len && !strncmp(s, c->str_dat, len))
345 return c;
347 c = pool_alloc(sizeof(struct atom_str) + len + 1);
348 c->str_len = len;
349 strncpy(c->str_dat, s, len);
350 c->str_dat[len] = 0;
351 c->next_atom = atom_table[hc];
352 atom_table[hc] = c;
353 atom_cnt++;
354 return c;
355 }
357 static struct branch* lookup_branch(const char *name)
358 {
359 unsigned int hc = hc_str(name, strlen(name)) % branch_table_sz;
360 struct branch *b;
362 for (b = branch_table[hc]; b; b = b->table_next_branch)
363 if (!strcmp(name, b->name))
364 return b;
365 return NULL;
366 }
368 static struct branch* new_branch(const char *name)
369 {
370 unsigned int hc = hc_str(name, strlen(name)) % branch_table_sz;
371 struct branch* b = lookup_branch(name);
373 if (b)
374 die("Invalid attempt to create duplicate branch: %s", name);
375 if (check_ref_format(name))
376 die("Branch name doesn't conform to GIT standards: %s", name);
378 b = pool_calloc(1, sizeof(struct branch));
379 b->name = pool_strdup(name);
380 b->table_next_branch = branch_table[hc];
381 branch_table[hc] = b;
382 branch_count++;
383 return b;
384 }
386 static unsigned int hc_entries(unsigned int cnt)
387 {
388 cnt = cnt & 7 ? (cnt / 8) + 1 : cnt / 8;
389 return cnt < avail_tree_table_sz ? cnt : avail_tree_table_sz - 1;
390 }
392 static struct tree_content* new_tree_content(unsigned int cnt)
393 {
394 struct avail_tree_content *f, *l = NULL;
395 struct tree_content *t;
396 unsigned int hc = hc_entries(cnt);
398 for (f = avail_tree_table[hc]; f; l = f, f = f->next_avail)
399 if (f->entry_capacity >= cnt)
400 break;
402 if (f) {
403 if (l)
404 l->next_avail = f->next_avail;
405 else
406 avail_tree_table[hc] = f->next_avail;
407 } else {
408 cnt = cnt & 7 ? ((cnt / 8) + 1) * 8 : cnt;
409 f = pool_alloc(sizeof(*t) + sizeof(t->entries[0]) * cnt);
410 f->entry_capacity = cnt;
411 }
413 t = (struct tree_content*)f;
414 t->entry_count = 0;
415 return t;
416 }
418 static void release_tree_entry(struct tree_entry *e);
419 static void release_tree_content(struct tree_content *t)
420 {
421 struct avail_tree_content *f = (struct avail_tree_content*)t;
422 unsigned int hc = hc_entries(f->entry_capacity);
423 f->next_avail = avail_tree_table[hc];
424 avail_tree_table[hc] = f;
425 }
427 static void release_tree_content_recursive(struct tree_content *t)
428 {
429 unsigned int i;
430 for (i = 0; i < t->entry_count; i++)
431 release_tree_entry(t->entries[i]);
432 release_tree_content(t);
433 }
435 static struct tree_content* grow_tree_content(
436 struct tree_content *t,
437 int amt)
438 {
439 struct tree_content *r = new_tree_content(t->entry_count + amt);
440 r->entry_count = t->entry_count;
441 memcpy(r->entries,t->entries,t->entry_count*sizeof(t->entries[0]));
442 release_tree_content(t);
443 return r;
444 }
446 static struct tree_entry* new_tree_entry()
447 {
448 struct tree_entry *e;
450 if (!avail_tree_entry) {
451 unsigned int n = tree_entry_alloc;
452 avail_tree_entry = e = xmalloc(n * sizeof(struct tree_entry));
453 while (n--) {
454 *((void**)e) = e + 1;
455 e++;
456 }
457 }
459 e = avail_tree_entry;
460 avail_tree_entry = *((void**)e);
461 return e;
462 }
464 static void release_tree_entry(struct tree_entry *e)
465 {
466 if (e->tree)
467 release_tree_content_recursive(e->tree);
468 *((void**)e) = avail_tree_entry;
469 avail_tree_entry = e;
470 }
472 static void yread(int fd, void *buffer, size_t length)
473 {
474 ssize_t ret = 0;
475 while (ret < length) {
476 ssize_t size = xread(fd, (char *) buffer + ret, length - ret);
477 if (!size)
478 die("Read from descriptor %i: end of stream", fd);
479 if (size < 0)
480 die("Read from descriptor %i: %s", fd, strerror(errno));
481 ret += size;
482 }
483 }
485 static void ywrite(int fd, void *buffer, size_t length)
486 {
487 ssize_t ret = 0;
488 while (ret < length) {
489 ssize_t size = xwrite(fd, (char *) buffer + ret, length - ret);
490 if (!size)
491 die("Write to descriptor %i: end of file", fd);
492 if (size < 0)
493 die("Write to descriptor %i: %s", fd, strerror(errno));
494 ret += size;
495 }
496 }
498 static size_t encode_header(
499 enum object_type type,
500 size_t size,
501 unsigned char *hdr)
502 {
503 int n = 1;
504 unsigned char c;
506 if (type < OBJ_COMMIT || type > OBJ_DELTA)
507 die("bad type %d", type);
509 c = (type << 4) | (size & 15);
510 size >>= 4;
511 while (size) {
512 *hdr++ = c | 0x80;
513 c = size & 0x7f;
514 size >>= 7;
515 n++;
516 }
517 *hdr = c;
518 return n;
519 }
521 static int store_object(
522 enum object_type type,
523 void *dat,
524 size_t datlen,
525 struct last_object *last,
526 unsigned char *sha1out)
527 {
528 void *out, *delta;
529 struct object_entry *e;
530 unsigned char hdr[96];
531 unsigned char sha1[20];
532 unsigned long hdrlen, deltalen;
533 SHA_CTX c;
534 z_stream s;
536 hdrlen = sprintf((char*)hdr,"%s %lu",type_names[type],datlen) + 1;
537 SHA1_Init(&c);
538 SHA1_Update(&c, hdr, hdrlen);
539 SHA1_Update(&c, dat, datlen);
540 SHA1_Final(sha1, &c);
541 if (sha1out)
542 memcpy(sha1out, sha1, sizeof(sha1));
544 e = insert_object(sha1);
545 if (e->offset) {
546 duplicate_count++;
547 duplicate_count_by_type[type]++;
548 return 1;
549 }
550 e->type = type;
551 e->offset = pack_offset;
552 object_count++;
553 object_count_by_type[type]++;
555 if (last && last->data && last->depth < max_depth)
556 delta = diff_delta(last->data, last->len,
557 dat, datlen,
558 &deltalen, 0);
559 else
560 delta = 0;
562 memset(&s, 0, sizeof(s));
563 deflateInit(&s, zlib_compression_level);
565 if (delta) {
566 last->depth++;
567 s.next_in = delta;
568 s.avail_in = deltalen;
569 hdrlen = encode_header(OBJ_DELTA, deltalen, hdr);
570 ywrite(pack_fd, hdr, hdrlen);
571 ywrite(pack_fd, last->sha1, sizeof(sha1));
572 pack_offset += hdrlen + sizeof(sha1);
573 } else {
574 if (last)
575 last->depth = 0;
576 s.next_in = dat;
577 s.avail_in = datlen;
578 hdrlen = encode_header(type, datlen, hdr);
579 ywrite(pack_fd, hdr, hdrlen);
580 pack_offset += hdrlen;
581 }
583 s.avail_out = deflateBound(&s, s.avail_in);
584 s.next_out = out = xmalloc(s.avail_out);
585 while (deflate(&s, Z_FINISH) == Z_OK)
586 /* nothing */;
587 deflateEnd(&s);
589 ywrite(pack_fd, out, s.total_out);
590 pack_offset += s.total_out;
592 free(out);
593 if (delta)
594 free(delta);
595 if (last) {
596 if (last->data)
597 free(last->data);
598 last->data = dat;
599 last->len = datlen;
600 memcpy(last->sha1, sha1, sizeof(sha1));
601 }
602 return 0;
603 }
605 static const char *get_mode(const char *str, unsigned int *modep)
606 {
607 unsigned char c;
608 unsigned int mode = 0;
610 while ((c = *str++) != ' ') {
611 if (c < '0' || c > '7')
612 return NULL;
613 mode = (mode << 3) + (c - '0');
614 }
615 *modep = mode;
616 return str;
617 }
619 static void load_tree(struct tree_entry *root)
620 {
621 struct object_entry *myoe;
622 struct tree_content *t;
623 unsigned long size;
624 char *buf;
625 const char *c;
626 char type[20];
628 root->tree = t = new_tree_content(8);
629 if (!memcmp(root->sha1, null_sha1, 20))
630 return;
632 myoe = find_object(root->sha1);
633 if (myoe) {
634 die("FIXME");
635 } else {
636 buf = read_sha1_file(root->sha1, type, &size);
637 if (!buf || strcmp(type, tree_type))
638 die("Can't load existing tree %s", sha1_to_hex(root->sha1));
639 }
641 c = buf;
642 while (c != (buf + size)) {
643 struct tree_entry *e = new_tree_entry();
645 if (t->entry_count == t->entry_capacity)
646 root->tree = t = grow_tree_content(t, 8);
647 t->entries[t->entry_count++] = e;
649 e->tree = NULL;
650 c = get_mode(c, &e->mode);
651 if (!c)
652 die("Corrupt mode in %s", sha1_to_hex(root->sha1));
653 e->name = to_atom(c, strlen(c));
654 c += e->name->str_len + 1;
655 memcpy(e->sha1, c, sizeof(e->sha1));
656 c += 20;
657 }
658 free(buf);
659 }
661 static int tecmp (const void *_a, const void *_b)
662 {
663 struct tree_entry *a = *((struct tree_entry**)_a);
664 struct tree_entry *b = *((struct tree_entry**)_b);
665 return base_name_compare(
666 a->name->str_dat, a->name->str_len, a->mode,
667 b->name->str_dat, b->name->str_len, b->mode);
668 }
670 static void store_tree(struct tree_entry *root)
671 {
672 struct tree_content *t = root->tree;
673 unsigned int i;
674 size_t maxlen;
675 char *buf, *c;
677 if (memcmp(root->sha1, null_sha1, 20))
678 return;
680 maxlen = 0;
681 for (i = 0; i < t->entry_count; i++) {
682 maxlen += t->entries[i]->name->str_len + 34;
683 if (t->entries[i]->tree)
684 store_tree(t->entries[i]);
685 }
687 qsort(t->entries, t->entry_count, sizeof(t->entries[0]), tecmp);
688 buf = c = xmalloc(maxlen);
689 for (i = 0; i < t->entry_count; i++) {
690 struct tree_entry *e = t->entries[i];
691 c += sprintf(c, "%o", e->mode);
692 *c++ = ' ';
693 strcpy(c, e->name->str_dat);
694 c += e->name->str_len + 1;
695 memcpy(c, e->sha1, 20);
696 c += 20;
697 }
698 store_object(OBJ_TREE, buf, c - buf, NULL, root->sha1);
699 free(buf);
700 }
702 static int tree_content_set(
703 struct tree_entry *root,
704 const char *p,
705 const unsigned char *sha1,
706 const unsigned int mode)
707 {
708 struct tree_content *t = root->tree;
709 const char *slash1;
710 unsigned int i, n;
711 struct tree_entry *e;
713 slash1 = strchr(p, '/');
714 if (slash1)
715 n = slash1 - p;
716 else
717 n = strlen(p);
719 for (i = 0; i < t->entry_count; i++) {
720 e = t->entries[i];
721 if (e->name->str_len == n && !strncmp(p, e->name->str_dat, n)) {
722 if (!slash1) {
723 if (e->mode == mode && !memcmp(e->sha1, sha1, 20))
724 return 0;
725 e->mode = mode;
726 memcpy(e->sha1, sha1, 20);
727 if (e->tree) {
728 release_tree_content_recursive(e->tree);
729 e->tree = NULL;
730 }
731 memcpy(root->sha1, null_sha1, 20);
732 return 1;
733 }
734 if (!S_ISDIR(e->mode)) {
735 e->tree = new_tree_content(8);
736 e->mode = S_IFDIR;
737 }
738 if (!e->tree)
739 load_tree(e);
740 if (tree_content_set(e, slash1 + 1, sha1, mode)) {
741 memcpy(root->sha1, null_sha1, 20);
742 return 1;
743 }
744 return 0;
745 }
746 }
748 if (t->entry_count == t->entry_capacity)
749 root->tree = t = grow_tree_content(t, 8);
750 e = new_tree_entry();
751 e->name = to_atom(p, n);
752 t->entries[t->entry_count++] = e;
753 if (slash1) {
754 e->tree = new_tree_content(8);
755 e->mode = S_IFDIR;
756 tree_content_set(e, slash1 + 1, sha1, mode);
757 } else {
758 e->tree = NULL;
759 e->mode = mode;
760 memcpy(e->sha1, sha1, 20);
761 }
762 memcpy(root->sha1, null_sha1, 20);
763 return 1;
764 }
766 static int tree_content_remove(struct tree_entry *root, const char *p)
767 {
768 struct tree_content *t = root->tree;
769 const char *slash1;
770 unsigned int i, n;
771 struct tree_entry *e;
773 slash1 = strchr(p, '/');
774 if (slash1)
775 n = slash1 - p;
776 else
777 n = strlen(p);
779 for (i = 0; i < t->entry_count; i++) {
780 e = t->entries[i];
781 if (e->name->str_len == n && !strncmp(p, e->name->str_dat, n)) {
782 if (!slash1 || !S_ISDIR(e->mode))
783 goto del_entry;
784 if (!e->tree)
785 load_tree(e);
786 if (tree_content_remove(e, slash1 + 1)) {
787 if (!e->tree->entry_count)
788 goto del_entry;
789 memcpy(root->sha1, null_sha1, 20);
790 return 1;
791 }
792 return 0;
793 }
794 }
795 return 0;
797 del_entry:
798 for (i++; i < t->entry_count; i++)
799 t->entries[i-1] = t->entries[i];
800 t->entry_count--;
801 release_tree_entry(e);
802 memcpy(root->sha1, null_sha1, 20);
803 return 1;
804 }
806 static void init_pack_header()
807 {
808 struct pack_header hdr;
810 hdr.hdr_signature = htonl(PACK_SIGNATURE);
811 hdr.hdr_version = htonl(2);
812 hdr.hdr_entries = 0;
814 ywrite(pack_fd, &hdr, sizeof(hdr));
815 pack_offset = sizeof(hdr);
816 }
818 static void fixup_header_footer()
819 {
820 SHA_CTX c;
821 char hdr[8];
822 unsigned long cnt;
823 char *buf;
824 size_t n;
826 if (lseek(pack_fd, 0, SEEK_SET) != 0)
827 die("Failed seeking to start: %s", strerror(errno));
829 SHA1_Init(&c);
830 yread(pack_fd, hdr, 8);
831 SHA1_Update(&c, hdr, 8);
833 cnt = htonl(object_count);
834 SHA1_Update(&c, &cnt, 4);
835 ywrite(pack_fd, &cnt, 4);
837 buf = xmalloc(128 * 1024);
838 for (;;) {
839 n = xread(pack_fd, buf, 128 * 1024);
840 if (n <= 0)
841 break;
842 SHA1_Update(&c, buf, n);
843 }
844 free(buf);
846 SHA1_Final(pack_sha1, &c);
847 ywrite(pack_fd, pack_sha1, sizeof(pack_sha1));
848 }
850 static int oecmp (const void *_a, const void *_b)
851 {
852 struct object_entry *a = *((struct object_entry**)_a);
853 struct object_entry *b = *((struct object_entry**)_b);
854 return memcmp(a->sha1, b->sha1, sizeof(a->sha1));
855 }
857 static void write_index(const char *idx_name)
858 {
859 struct sha1file *f;
860 struct object_entry **idx, **c, **last;
861 struct object_entry *e;
862 struct object_entry_pool *o;
863 unsigned int array[256];
864 int i;
866 /* Build the sorted table of object IDs. */
867 idx = xmalloc(object_count * sizeof(struct object_entry*));
868 c = idx;
869 for (o = blocks; o; o = o->next_pool)
870 for (e = o->entries; e != o->next_free; e++)
871 *c++ = e;
872 last = idx + object_count;
873 qsort(idx, object_count, sizeof(struct object_entry*), oecmp);
875 /* Generate the fan-out array. */
876 c = idx;
877 for (i = 0; i < 256; i++) {
878 struct object_entry **next = c;;
879 while (next < last) {
880 if ((*next)->sha1[0] != i)
881 break;
882 next++;
883 }
884 array[i] = htonl(next - idx);
885 c = next;
886 }
888 f = sha1create("%s", idx_name);
889 sha1write(f, array, 256 * sizeof(int));
890 for (c = idx; c != last; c++) {
891 unsigned int offset = htonl((*c)->offset);
892 sha1write(f, &offset, 4);
893 sha1write(f, (*c)->sha1, sizeof((*c)->sha1));
894 }
895 sha1write(f, pack_sha1, sizeof(pack_sha1));
896 sha1close(f, NULL, 1);
897 free(idx);
898 }
900 static void dump_branches()
901 {
902 static const char *msg = "fast-import";
903 unsigned int i;
904 struct branch *b;
905 struct ref_lock *lock;
907 for (i = 0; i < branch_table_sz; i++) {
908 for (b = branch_table[i]; b; b = b->table_next_branch) {
909 lock = lock_any_ref_for_update(b->name, NULL, 0);
910 if (!lock || write_ref_sha1(lock, b->sha1, msg) < 0)
911 die("Can't write %s", b->name);
912 }
913 }
914 }
916 static void read_next_command()
917 {
918 read_line(&command_buf, stdin, '\n');
919 }
921 static void cmd_mark()
922 {
923 if (!strncmp("mark :", command_buf.buf, 6)) {
924 command_mark = strtoul(command_buf.buf + 6, NULL, 10);
925 read_next_command();
926 }
927 else
928 command_mark = 0;
929 }
931 static void* cmd_data (size_t *size)
932 {
933 size_t n = 0;
934 void *buffer;
935 size_t length;
937 if (strncmp("data ", command_buf.buf, 5))
938 die("Expected 'data n' command, found: %s", command_buf.buf);
940 length = strtoul(command_buf.buf + 5, NULL, 10);
941 buffer = xmalloc(length);
943 while (n < length) {
944 size_t s = fread((char*)buffer + n, 1, length - n, stdin);
945 if (!s && feof(stdin))
946 die("EOF in data (%lu bytes remaining)", length - n);
947 n += s;
948 }
950 if (fgetc(stdin) != '\n')
951 die("An lf did not trail the binary data as expected.");
953 *size = length;
954 return buffer;
955 }
957 static void cmd_new_blob()
958 {
959 size_t datlen;
960 void *dat;
961 unsigned char sha1[20];
963 read_next_command();
964 cmd_mark();
965 dat = cmd_data(&datlen);
967 if (store_object(OBJ_BLOB, dat, datlen, &last_blob, sha1))
968 free(dat);
969 }
971 static void unload_one_branch()
972 {
973 while (cur_active_branches >= max_active_branches) {
974 unsigned long min_commit = ULONG_MAX;
975 struct branch *e, *l = NULL, *p = NULL;
977 for (e = active_branches; e; e = e->active_next_branch) {
978 if (e->last_commit < min_commit) {
979 p = l;
980 min_commit = e->last_commit;
981 }
982 l = e;
983 }
985 if (p) {
986 e = p->active_next_branch;
987 p->active_next_branch = e->active_next_branch;
988 } else {
989 e = active_branches;
990 active_branches = e->active_next_branch;
991 }
992 e->active_next_branch = NULL;
993 if (e->branch_tree.tree) {
994 release_tree_content_recursive(e->branch_tree.tree);
995 e->branch_tree.tree = NULL;
996 }
997 cur_active_branches--;
998 }
999 }
1001 static void load_branch(struct branch *b)
1002 {
1003 load_tree(&b->branch_tree);
1004 b->active_next_branch = active_branches;
1005 active_branches = b;
1006 cur_active_branches++;
1007 }
1009 static void file_change_m(struct branch *b)
1010 {
1011 const char *p = command_buf.buf + 2;
1012 char *p_uq;
1013 const char *endp;
1014 struct object_entry *oe;
1015 unsigned char sha1[20];
1016 unsigned int mode;
1017 char type[20];
1019 p = get_mode(p, &mode);
1020 if (!p)
1021 die("Corrupt mode: %s", command_buf.buf);
1022 switch (mode) {
1023 case S_IFREG | 0644:
1024 case S_IFREG | 0755:
1025 case S_IFLNK:
1026 case 0644:
1027 case 0755:
1028 /* ok */
1029 break;
1030 default:
1031 die("Corrupt mode: %s", command_buf.buf);
1032 }
1034 if (get_sha1_hex(p, sha1))
1035 die("Invalid SHA1: %s", command_buf.buf);
1036 p += 40;
1037 if (*p++ != ' ')
1038 die("Missing space after SHA1: %s", command_buf.buf);
1040 p_uq = unquote_c_style(p, &endp);
1041 if (p_uq) {
1042 if (*endp)
1043 die("Garbage after path in: %s", command_buf.buf);
1044 p = p_uq;
1045 }
1047 oe = find_object(sha1);
1048 if (oe) {
1049 if (oe->type != OBJ_BLOB)
1050 die("Not a blob (actually a %s): %s",
1051 command_buf.buf, type_names[oe->type]);
1052 } else {
1053 if (sha1_object_info(sha1, type, NULL))
1054 die("Blob not found: %s", command_buf.buf);
1055 if (strcmp(blob_type, type))
1056 die("Not a blob (actually a %s): %s",
1057 command_buf.buf, type);
1058 }
1060 tree_content_set(&b->branch_tree, p, sha1, S_IFREG | mode);
1062 if (p_uq)
1063 free(p_uq);
1064 }
1066 static void file_change_d(struct branch *b)
1067 {
1068 const char *p = command_buf.buf + 2;
1069 char *p_uq;
1070 const char *endp;
1072 p_uq = unquote_c_style(p, &endp);
1073 if (p_uq) {
1074 if (*endp)
1075 die("Garbage after path in: %s", command_buf.buf);
1076 p = p_uq;
1077 }
1078 tree_content_remove(&b->branch_tree, p);
1079 if (p_uq)
1080 free(p_uq);
1081 }
1083 static void cmd_new_commit()
1084 {
1085 struct branch *b;
1086 void *msg;
1087 size_t msglen;
1088 char *str_uq;
1089 const char *endp;
1090 char *sp;
1091 char *author = NULL;
1092 char *committer = NULL;
1093 char *body;
1095 /* Obtain the branch name from the rest of our command */
1096 sp = strchr(command_buf.buf, ' ') + 1;
1097 str_uq = unquote_c_style(sp, &endp);
1098 if (str_uq) {
1099 if (*endp)
1100 die("Garbage after ref in: %s", command_buf.buf);
1101 sp = str_uq;
1102 }
1103 b = lookup_branch(sp);
1104 if (!b)
1105 die("Branch not declared: %s", sp);
1106 if (str_uq)
1107 free(str_uq);
1109 read_next_command();
1110 cmd_mark();
1111 if (!strncmp("author ", command_buf.buf, 7)) {
1112 author = strdup(command_buf.buf);
1113 read_next_command();
1114 }
1115 if (!strncmp("committer ", command_buf.buf, 10)) {
1116 committer = strdup(command_buf.buf);
1117 read_next_command();
1118 }
1119 if (!committer)
1120 die("Expected committer but didn't get one");
1121 msg = cmd_data(&msglen);
1123 /* ensure the branch is active/loaded */
1124 if (!b->branch_tree.tree) {
1125 unload_one_branch();
1126 load_branch(b);
1127 }
1129 /* file_change* */
1130 for (;;) {
1131 read_next_command();
1132 if (1 == command_buf.len)
1133 break;
1134 else if (!strncmp("M ", command_buf.buf, 2))
1135 file_change_m(b);
1136 else if (!strncmp("D ", command_buf.buf, 2))
1137 file_change_d(b);
1138 else
1139 die("Unsupported file_change: %s", command_buf.buf);
1140 }
1142 /* build the tree and the commit */
1143 store_tree(&b->branch_tree);
1144 body = xmalloc(97 + msglen
1145 + (author
1146 ? strlen(author) + strlen(committer)
1147 : 2 * strlen(committer)));
1148 sp = body;
1149 sp += sprintf(sp, "tree %s\n", sha1_to_hex(b->branch_tree.sha1));
1150 if (memcmp(b->sha1, null_sha1, 20))
1151 sp += sprintf(sp, "parent %s\n", sha1_to_hex(b->sha1));
1152 if (author)
1153 sp += sprintf(sp, "%s\n", author);
1154 else
1155 sp += sprintf(sp, "author %s\n", committer + 10);
1156 sp += sprintf(sp, "%s\n\n", committer);
1157 memcpy(sp, msg, msglen);
1158 sp += msglen;
1159 if (author)
1160 free(author);
1161 free(committer);
1162 free(msg);
1164 store_object(OBJ_COMMIT, body, sp - body, NULL, b->sha1);
1165 free(body);
1166 b->last_commit = object_count_by_type[OBJ_COMMIT];
1167 }
1169 static void cmd_new_branch()
1170 {
1171 struct branch *b;
1172 char *str_uq;
1173 const char *endp;
1174 char *sp;
1176 /* Obtain the new branch name from the rest of our command */
1177 sp = strchr(command_buf.buf, ' ') + 1;
1178 str_uq = unquote_c_style(sp, &endp);
1179 if (str_uq) {
1180 if (*endp)
1181 die("Garbage after ref in: %s", command_buf.buf);
1182 sp = str_uq;
1183 }
1184 b = new_branch(sp);
1185 if (str_uq)
1186 free(str_uq);
1187 read_next_command();
1189 /* from ... */
1190 if (!strncmp("from ", command_buf.buf, 5)) {
1191 const char *from;
1192 struct branch *s;
1194 from = strchr(command_buf.buf, ' ') + 1;
1195 str_uq = unquote_c_style(from, &endp);
1196 if (str_uq) {
1197 if (*endp)
1198 die("Garbage after string in: %s", command_buf.buf);
1199 from = str_uq;
1200 }
1202 s = lookup_branch(from);
1203 if (b == s)
1204 die("Can't create a branch from itself: %s", b->name);
1205 else if (s) {
1206 memcpy(b->sha1, s->sha1, 20);
1207 memcpy(b->branch_tree.sha1, s->branch_tree.sha1, 20);
1208 } else if (!get_sha1(from, b->sha1)) {
1209 if (!memcmp(b->sha1, null_sha1, 20))
1210 memcpy(b->branch_tree.sha1, null_sha1, 20);
1211 else {
1212 unsigned long size;
1213 char *buf;
1215 buf = read_object_with_reference(b->sha1,
1216 type_names[OBJ_COMMIT], &size, b->sha1);
1217 if (!buf || size < 46)
1218 die("Not a valid commit: %s", from);
1219 if (memcmp("tree ", buf, 5)
1220 || get_sha1_hex(buf + 5, b->branch_tree.sha1))
1221 die("The commit %s is corrupt", sha1_to_hex(b->sha1));
1222 free(buf);
1223 }
1224 } else
1225 die("Invalid ref name or SHA1 expression: %s", from);
1227 if (str_uq)
1228 free(str_uq);
1229 read_next_command();
1230 } else {
1231 memcpy(b->sha1, null_sha1, 20);
1232 memcpy(b->branch_tree.sha1, null_sha1, 20);
1233 }
1235 if (command_buf.eof || command_buf.len > 1)
1236 die("An lf did not terminate the branch command as expected.");
1237 }
1239 int main(int argc, const char **argv)
1240 {
1241 const char *base_name = argv[1];
1242 int est_obj_cnt = atoi(argv[2]);
1243 char *pack_name;
1244 char *idx_name;
1245 struct stat sb;
1247 setup_ident();
1248 git_config(git_default_config);
1250 pack_name = xmalloc(strlen(base_name) + 6);
1251 sprintf(pack_name, "%s.pack", base_name);
1252 idx_name = xmalloc(strlen(base_name) + 5);
1253 sprintf(idx_name, "%s.idx", base_name);
1255 pack_fd = open(pack_name, O_RDWR|O_CREAT|O_EXCL, 0666);
1256 if (pack_fd < 0)
1257 die("Can't create %s: %s", pack_name, strerror(errno));
1259 init_pack_header();
1260 alloc_objects(est_obj_cnt);
1261 strbuf_init(&command_buf);
1263 atom_table = xcalloc(atom_table_sz, sizeof(struct atom_str*));
1264 branch_table = xcalloc(branch_table_sz, sizeof(struct branch*));
1265 avail_tree_table = xcalloc(avail_tree_table_sz, sizeof(struct avail_tree_content*));
1267 for (;;) {
1268 read_next_command();
1269 if (command_buf.eof)
1270 break;
1271 else if (!strcmp("blob", command_buf.buf))
1272 cmd_new_blob();
1273 else if (!strncmp("branch ", command_buf.buf, 7))
1274 cmd_new_branch();
1275 else if (!strncmp("commit ", command_buf.buf, 7))
1276 cmd_new_commit();
1277 else
1278 die("Unsupported command: %s", command_buf.buf);
1279 }
1281 fixup_header_footer();
1282 close(pack_fd);
1283 write_index(idx_name);
1284 dump_branches();
1286 fprintf(stderr, "%s statistics:\n", argv[0]);
1287 fprintf(stderr, "---------------------------------------------------\n");
1288 fprintf(stderr, "Alloc'd objects: %10lu (%10lu overflow )\n", alloc_count, alloc_count - est_obj_cnt);
1289 fprintf(stderr, "Total objects: %10lu (%10lu duplicates)\n", object_count, duplicate_count);
1290 fprintf(stderr, " blobs : %10lu (%10lu duplicates)\n", object_count_by_type[OBJ_BLOB], duplicate_count_by_type[OBJ_BLOB]);
1291 fprintf(stderr, " trees : %10lu (%10lu duplicates)\n", object_count_by_type[OBJ_TREE], duplicate_count_by_type[OBJ_TREE]);
1292 fprintf(stderr, " commits: %10lu (%10lu duplicates)\n", object_count_by_type[OBJ_COMMIT], duplicate_count_by_type[OBJ_COMMIT]);
1293 fprintf(stderr, " tags : %10lu (%10lu duplicates)\n", object_count_by_type[OBJ_TAG], duplicate_count_by_type[OBJ_TAG]);
1294 fprintf(stderr, "Total branches: %10lu\n", branch_count);
1295 fprintf(stderr, "Total atoms: %10u\n", atom_cnt);
1296 fprintf(stderr, "Memory total: %10lu KiB\n", (total_allocd + alloc_count*sizeof(struct object_entry))/1024);
1297 fprintf(stderr, " pools: %10lu KiB\n", total_allocd/1024);
1298 fprintf(stderr, " objects: %10lu KiB\n", (alloc_count*sizeof(struct object_entry))/1024);
1299 fprintf(stderr, "---------------------------------------------------\n");
1301 stat(pack_name, &sb);
1302 fprintf(stderr, "Pack size: %10lu KiB\n", (unsigned long)(sb.st_size/1024));
1303 stat(idx_name, &sb);
1304 fprintf(stderr, "Index size: %10lu KiB\n", (unsigned long)(sb.st_size/1024));
1306 fprintf(stderr, "\n");
1308 return 0;
1309 }