Gotweb

Blob

Date:: Wed Mar 18 16:10:32 2020 UTC
Message:: send fetch progress over imsg
Actions:: History | Blame | Raw File
1 /*
2  * Copyright (c) 2019 Ori Bernstein <ori@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/types.h>
18 #include <sys/queue.h>
19 #include <sys/uio.h>
20 #include <sys/time.h>
21 #include <sys/stat.h>
22 #include <sys/syslimits.h>
23 
24 #include <stdint.h>
25 #include <errno.h>
26 #include <imsg.h>
27 #include <limits.h>
28 #include <signal.h>
29 #include <stdio.h>
30 #include <stdlib.h>
31 #include <string.h>
32 #include <ctype.h>
33 #include <sha1.h>
34 #include <fcntl.h>
35 #include <zlib.h>
36 #include <err.h>
37 
38 #include "got_error.h"
39 #include "got_object.h"
40 
41 #include "got_lib_sha1.h"
42 #include "got_lib_delta.h"
43 #include "got_lib_inflate.h"
44 #include "got_lib_object.h"
45 #include "got_lib_object_parse.h"
46 #include "got_lib_privsep.h"
47 
48 #define GOT_PKTMAX	65536
49 
50 struct got_object *indexed;
51 static int chattygit;
52 static char *fetchbranch;
53 static char *upstream = "origin";
54 static struct got_object_id zhash = {.sha1={0}};
55 
56 static char*
57 strip(char *ref)
58 {
59 	return ref;
60 }
61 
62 int
63 readn(int fd, void *buf, size_t n)
64 {
65 	ssize_t r, off;
66 
67 	off = 0;
68 	while (off != n) {
69 		r = read(fd, buf + off, n - off);
70 		if (r < 0)
71 			return -1;
72 		if (r == 0)
73 			return off;
74 		off += r;
75 	}
76 	return off;
77 }
78 
79 int
80 flushpkt(int fd)
81 {
82 	if(chattygit)
83 		fprintf(stderr, "writepkt: 0000\n");
84 	return write(fd, "0000", 4);
85 }
86 
87 
88 int
89 readpkt(int fd, char *buf, int nbuf)
90 {
91 	char len[5];
92 	char *e;
93 	int n, r;
94 
95 	if(readn(fd, len, 4) == -1){
96 		return -1;
97 	}
98 	len[4] = 0;
99 	n = strtol(len, &e, 16);
100 	if(n == 0){
101 		if(chattygit)
102 			fprintf(stderr, "readpkt: 0000\n");
103 		return 0;
104 	}
105 	if(e != len + 4 || n <= 4)
106 		err(1, "invalid packet line length");
107 	n  -= 4;
108 	if(n >= nbuf)
109 		err(1, "buffer too small");
110 	if((r = readn(fd, buf, n)) != n)
111 		return -1;
112 	buf[n] = 0;
113 	if(chattygit)
114 		fprintf(stderr, "readpkt: %s:\t%.*s\n", len, nbuf, buf);
115 	return n;
116 }
117 
118 int
119 writepkt(int fd, char *buf, int nbuf)
120 {
121 	char len[5];
122 	int i;
123 
124 	if (snprintf(len, sizeof(len), "%04x", nbuf + 4) >= sizeof(len))
125 		return -1;
126 	if(write(fd, len, 4) != 4)
127 		return -1;
128 	if(write(fd, buf, nbuf) != nbuf)
129 		return -1;
130 	if(chattygit){
131 		fprintf(stderr, "writepkt: %s:\t", len);
132 		fwrite(buf, 1, nbuf, stderr);
133 		for(i = 0; i < nbuf; i++){
134 			if(isprint(buf[i]))
135 				fputc(buf[i], stderr);
136 		}
137 	}
138 	return 0;
139 }
140 
141 
142 int
143 got_resolve_remote_ref(struct got_object_id *id, char *ref)
144 {
145 	char buf[128], *s;
146 	int r, f;
147 
148 	ref = strip(ref);
149 	if(!got_parse_sha1_digest(id->sha1, ref))
150 		return 0;
151 
152 	/* Slightly special handling: translate remote refs to local ones. */
153 	if (strcmp(ref, "HEAD") == 0) {
154 		if(snprintf(buf, sizeof(buf), ".git/HEAD") >= sizeof(buf))
155 			return -1;
156 	} else if(strstr(ref, "refs/heads") == ref) {
157 		ref += strlen("refs/heads");
158 		if(snprintf(buf, sizeof(buf),
159 		    ".git/refs/remotes/%s/%s", upstream, ref) >= sizeof(buf))
160 			return -1;
161 	} else if(strstr(ref, "refs/tags") == ref) {
162 		ref += strlen("refs/tags");
163 		if(snprintf(buf, sizeof(buf),
164 		    ".git/refs/tags/%s/%s", upstream, ref) >= sizeof(buf))
165 			return -1;
166 	} else {
167 		return -1;
168 	}
169 
170 	r = -1;
171 	s = strip(buf);
172 	if((f = open(s, O_RDONLY)) == -1)
173 		goto err;
174 	if(readn(f, buf, sizeof(buf)) < 40)
175 		goto err;
176 	if(!got_parse_sha1_digest(id->sha1, buf))
177 		goto err;
178 err:
179 	close(f);
180 	if(r == -1 && strstr(buf, "ref:") == buf)
181 		return got_resolve_remote_ref(id, buf + strlen("ref:"));
182 	return r;
183 }
184 
185 static int
186 got_check_pack_hash(int fd, size_t sz, uint8_t *hcomp)
187 {
188 	SHA1_CTX ctx;
189 	uint8_t hexpect[SHA1_DIGEST_LENGTH];
190 	char s1[SHA1_DIGEST_STRING_LENGTH + 1];
191 	char s2[SHA1_DIGEST_STRING_LENGTH + 1];
192 	uint8_t buf[32*1024];
193 	ssize_t n, r, nr;
194 
195 	if(sz < 28)
196 		return -1;
197 
198 	n = 0;
199 	SHA1Init(&ctx);
200 	while(n < sz - 20){
201 		nr = sizeof(buf);
202 		if(sz - n - 20 < sizeof(buf))
203 			nr = sz - n - 20;
204 		r = readn(fd, buf, nr);
205 		if(r != nr)
206 			return -1;
207 		SHA1Update(&ctx, buf, nr);
208 		n += r;
209 	}
210 	SHA1Final(hcomp, &ctx);
211 
212 	if(readn(fd, hexpect, sizeof(hexpect)) != sizeof(hexpect))
213 		errx(1, "truncated packfile");
214 	if(memcmp(hcomp, hexpect, SHA1_DIGEST_LENGTH) != 0){
215 		got_sha1_digest_to_str(hcomp, s1, sizeof(s1));
216 		got_sha1_digest_to_str(hexpect, s2, sizeof(s2));
217 		printf("hash mismatch %s != %s\n", s1, s2);
218 		return -1;
219 	}
220 	return 0;
221 }
222 
223 int
224 got_has_object(struct got_object_id *obj)
225 {
226 	return 0;
227 }
228 
229 /*static */int
230 got_make_pack_dir(char *path)
231 {
232 	char s[128];
233 	char *p;
234 
235 	if(snprintf(s, sizeof(s), "%s", path) >= sizeof(s))
236 		return -1;
237 	for(p=strchr(s+1, '/'); p; p=strchr(p+1, '/')){
238 		*p = 0;
239 		if (mkdir(s, 0755) == -1)
240 			if(errno != EEXIST)
241 				return -1;
242 		*p = '/';
243 	}
244 	return 0;
245 }
246 
247 static int
248 got_match_branch(char *br, char *pat)
249 {
250 	char name[128];
251 
252 	if(strstr(pat, "refs/heads") == pat) {
253 		if (snprintf(name, sizeof(name), "%s", pat) >= sizeof(name))
254 			return -1;
255 	} else if(strstr(pat, "heads")) {
256 		if (snprintf(name, sizeof(name), "refs/%s", pat) >= sizeof(name))
257 			return -1;
258 	} else {
259 		if (snprintf(name, sizeof(name), "refs/heads/%s", pat) >= sizeof(name))
260 			return -1;
261 	}
262 	return strcmp(br, name) == 0;
263 }
264 
265 static int
266 got_tokenize_refline(char *line, char **sp, size_t nsp)
267 {
268 	char *p;
269 	size_t i, j;
270 
271 	for (i = 0; i < nsp; i++) {
272 		while (isspace(*line))
273 			line++;
274 		p = line;
275 		while (*line != '\0' && (!isspace(*line) || i == nsp - 1))
276 			line++;
277 		sp[i] = strndup(p, line - p);
278 	}
279 	for (j = i; j < nsp; j++)
280 		sp[j] = NULL;
281 	return i;
282 }
283 
284 static const struct got_error *
285 fetch_pack(int fd, int packfd, struct got_object_id *packid,
286     struct imsgbuf *ibuf)
287 {
288 	const struct got_error *err = NULL;
289 	char buf[GOT_PKTMAX], *sp[3];
290 	char hashstr[SHA1_DIGEST_STRING_LENGTH];
291 	struct got_object_id *have, *want;
292 	int nref, refsz;
293 	int i, n, req;
294 	off_t packsz;
295 
296 	nref = 0;
297 	refsz = 16;
298 	have = malloc(refsz * sizeof(have[0]));
299 	if (have == NULL)
300 		return got_error_from_errno("malloc");
301 	want = malloc(refsz * sizeof(want[0]));
302 	if (want == NULL) {
303 		err = got_error_from_errno("malloc");
304 		goto done;
305 	}
306 	if (chattygit)
307 		fprintf(stderr, "starting fetch\n");
308 	while (1) {
309 		n = readpkt(fd, buf, sizeof(buf));
310 		if (n == -1){
311 			err = got_error_from_errno("readpkt:");
312 			goto done;
313 		}
314 		if (n == 0)
315 			break;
316 		if (strncmp(buf, "ERR ", 4) == 0) {
317 			static char msg[1024];
318 			strlcpy(msg, buf + 4, sizeof(msg));
319 			err = got_error_msg(GOT_ERR_FETCH_FAILED, msg);
320 			goto done;
321 		}
322 		if (got_tokenize_refline(buf, sp, 3) <= 2) {
323 			err = got_error(GOT_ERR_NOT_REF);
324 			goto done;
325 		}
326 		if (strstr(sp[1], "^{}"))
327 			continue;
328 		if (fetchbranch && !got_match_branch(sp[1], fetchbranch))
329 			continue;
330 		if (refsz == nref + 1){
331 			refsz *= 2;
332 			have = realloc(have, refsz * sizeof(have[0]));
333 			if (have == NULL) {
334 				err = got_error_from_errno("realloc");
335 				goto done;
336 			}
337 			want = realloc(want, refsz * sizeof(want[0]));
338 			if (want == NULL) {
339 				err = got_error_from_errno("realloc");
340 				goto done;
341 			}
342 		}
343 		if (!got_parse_sha1_digest(want[nref].sha1, sp[0])) {
344 			err = got_error(GOT_ERR_BAD_OBJ_ID_STR);
345 			goto done;
346 		}
347 
348 		if (got_resolve_remote_ref(&have[nref], sp[1]) == -1)
349 			memset(&have[nref], 0, sizeof(have[nref]));
350 		err = got_privsep_send_fetch_progress(ibuf, &want[nref], sp[1]);
351 		if (err)
352 			goto done;
353 		if (chattygit)
354 			fprintf(stderr, "remote %s\n", sp[1]);
355 		nref++;
356 	}
357 
358 	req = 0;
359 	for (i = 0; i < nref; i++){
360 		if (got_object_id_cmp(&have[i], &want[i]) == 0)
361 			continue;
362 		if (got_has_object(&want[i]))
363 			continue;
364 		got_sha1_digest_to_str(want[i].sha1, hashstr, sizeof(hashstr));
365 		n = snprintf(buf, sizeof(buf), "want %s\n", hashstr);
366 		if (n >= sizeof(buf)) {
367 			err = got_error(GOT_ERR_NO_SPACE);
368 			goto done;
369 		}
370 		if (writepkt(fd, buf, n) == -1) {
371 			err = got_error_from_errno("writepkt");
372 			goto done;
373 		}
374 		req = 1;
375 	}
376 	flushpkt(fd);
377 	for (i = 0; i < nref; i++){
378 		if (got_object_id_cmp(&have[i], &zhash) == 0)
379 			continue;
380 		got_sha1_digest_to_str(want[i].sha1, hashstr, sizeof(hashstr));
381 		n = snprintf(buf, sizeof(buf), "have %s\n", hashstr);
382 		if (n >= sizeof(buf)) {
383 			err = got_error(GOT_ERR_NO_SPACE);
384 			goto done;
385 		}
386 		if (writepkt(fd, buf, n + 1) == -1) {
387 			err = got_error_from_errno("writepkt");
388 			goto done;
389 		}
390 	}
391 	if (!req){
392 		fprintf(stderr, "up to date\n");
393 		flushpkt(fd);
394 	}
395 	n = snprintf(buf, sizeof(buf), "done\n");
396 	if (writepkt(fd, buf, n) == -1) {
397 		err = got_error_from_errno("writepkt");
398 		goto done;
399 	}
400 	if (!req)
401 		return 0;
402 
403 	if ((n = readpkt(fd, buf, sizeof(buf))) == -1) {
404 		err = got_error_from_errno("readpkt");
405 		goto done;
406 	}
407 	buf[n] = 0;
408 
409 	if (chattygit)
410 		fprintf(stderr, "fetching...\n");
411 	packsz = 0;
412 	while (1) {
413 		ssize_t w;
414 		n = readn(fd, buf, sizeof buf);
415 		if (n == 0)
416 			break;
417 		if (n == -1) {
418 			err = got_error_from_errno("readn");
419 			goto done;
420 		}
421 		w = write(packfd, buf, n);
422 		if (w == -1) {
423 			err = got_error_from_errno("write");
424 			goto done;
425 		}
426 		if (w != n) {
427 			err = got_error(GOT_ERR_IO);
428 			goto done;
429 		}
430 		packsz += n;
431 	}
432 	if (lseek(packfd, 0, SEEK_SET) == -1) {
433 		err = got_error_from_errno("lseek");
434 		goto done;
435 	}
436 	if (got_check_pack_hash(packfd, packsz, packid->sha1) == -1)
437 		err = got_error(GOT_ERR_BAD_PACKFILE);
438 done:
439 	free(have);
440 	free(want);
441 	return err;
442 }
443 
444 
445 int
446 main(int argc, char **argv)
447 {
448 	const struct got_error *err = NULL;
449 	int fetchfd, packfd = -1;
450 	struct got_object_id packid;
451 	struct imsgbuf ibuf;
452 	struct imsg imsg;
453 
454 	if(getenv("GOT_DEBUG") != NULL){
455 		fprintf(stderr, "fetch-pack being chatty!\n");
456 		chattygit = 1;
457 	}
458 
459 	imsg_init(&ibuf, GOT_IMSG_FD_CHILD);
460 	if((err = got_privsep_recv_imsg(&imsg, &ibuf, 0)) != 0) {
461 		if (err->code == GOT_ERR_PRIVSEP_PIPE)
462 			err = NULL;
463 		goto done;
464 	}
465 	if (imsg.hdr.type == GOT_IMSG_STOP)
466 		goto done;
467 	if (imsg.hdr.type != GOT_IMSG_FETCH_REQUEST) {
468 		err = got_error(GOT_ERR_PRIVSEP_MSG);
469 		goto done;
470 	}
471 	if (imsg.hdr.len - IMSG_HEADER_SIZE != 0) {
472 		err = got_error(GOT_ERR_PRIVSEP_LEN);
473 		goto done;
474 	}
475 	fetchfd = imsg.fd;
476 
477 	if((err = got_privsep_recv_imsg(&imsg, &ibuf, 0)) != 0) {
478 		if (err->code == GOT_ERR_PRIVSEP_PIPE)
479 			err = NULL;
480 		goto done;
481 	}
482 	if (imsg.hdr.type == GOT_IMSG_STOP)
483 		goto done;
484 	if (imsg.hdr.type != GOT_IMSG_TMPFD) {
485 		err = got_error(GOT_ERR_PRIVSEP_MSG);
486 		goto done;
487 	}
488 	if (imsg.hdr.len - IMSG_HEADER_SIZE != 0) {
489 		err = got_error(GOT_ERR_PRIVSEP_LEN);
490 		goto done;
491 	}
492 	packfd = imsg.fd;
493 
494 	err = fetch_pack(fetchfd, packfd, &packid, &ibuf);
495 	if (err)
496 		goto done;
497 done:
498 	if (packfd != -1 && close(packfd) == -1 && err == NULL)
499 		err = got_error_from_errno("close");
500 	if (err != NULL)
501 		got_privsep_send_error(&ibuf, err);
502 	else
503 		err = got_privsep_send_fetch_done(&ibuf, packid);
504 	if(err != NULL) {
505 		fprintf(stderr, "%s: %s\n", getprogname(), err->msg);
506 		got_privsep_send_error(&ibuf, err);
507 	}
508 
509 	exit(0);
510 }