2 * Copyright 1986, Larry Wall
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following condition is met:
6 * 1. Redistributions of source code must retain the above copyright notice,
7 * this condition and the following disclaimer.
9 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
10 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
11 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
12 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
13 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
14 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
15 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
16 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
17 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
18 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * Copyright (c) 2022 Omar Polo <op@openbsd.org>
25 * Permission to use, copy, modify, and distribute this software for any
26 * purpose with or without fee is hereby granted, provided that the above
27 * copyright notice and this permission notice appear in all copies.
29 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
30 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
31 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
32 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
33 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
34 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
35 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
38 #include <sys/types.h>
39 #include <sys/queue.h>
53 #include "got_error.h"
54 #include "got_object.h"
56 #include "got_lib_delta.h"
57 #include "got_lib_object.h"
58 #include "got_lib_privsep.h"
59 #include "got_lib_sha1.h"
63 static const struct got_error *
64 send_patch(const char *oldname, const char *newname, const char *commitid,
65 const char *blob, int git)
67 struct got_imsg_patch p;
69 memset(&p, 0, sizeof(p));
72 strlcpy(p.old, oldname, sizeof(p.old));
75 strlcpy(p.new, newname, sizeof(p.new));
78 strlcpy(p.cid, commitid, sizeof(p.cid));
81 strlcpy(p.blob, blob, sizeof(p.blob));
84 if (imsg_compose(&ibuf, GOT_IMSG_PATCH, 0, 0, -1, &p, sizeof(p)) == -1)
85 return got_error_from_errno("imsg_compose GOT_IMSG_PATCH");
89 static const struct got_error *
92 if (imsg_compose(&ibuf, GOT_IMSG_PATCH_DONE, 0, 0, -1,
94 return got_error_from_errno("imsg_compose GOT_IMSG_PATCH_EOF");
95 if (imsg_flush(&ibuf) == -1)
96 return got_error_from_errno("imsg_flush");
100 /* based on fetchname from usr.bin/patch/util.c */
101 static const struct got_error *
102 filename(const char *at, char **name)
110 while (isspace((unsigned char)*at))
113 /* files can be created or removed by diffing against /dev/null */
114 if (!strncmp(at, _PATH_DEVNULL, sizeof(_PATH_DEVNULL) - 1))
119 return got_error_from_errno("strdup");
120 if ((t = strchr(tmp, '\t')) != NULL)
122 if ((t = strchr(tmp, '\n')) != NULL)
128 return got_error_from_errno("strdup");
132 static const struct got_error *
133 blobid(const char *line, char **blob, int git)
135 uint8_t digest[SHA1_DIGEST_LENGTH];
140 len = strspn(line, "0123456789abcdefABCDEF");
141 if ((*blob = strndup(line, len)) == NULL)
142 return got_error_from_errno("strndup");
144 if (!git && !got_parse_sha1_digest(digest, *blob)) {
145 /* silently ignore invalid blob ids */
152 static const struct got_error *
153 find_patch(int *done, FILE *fp)
155 const struct got_error *err = NULL;
156 char *old = NULL, *new = NULL;
157 char *commitid = NULL, *blob = NULL;
161 int create, rename = 0, git = 0;
163 while ((linelen = getline(&line, &linesize, fp)) != -1) {
165 * Ignore the Index name like GNU and larry' patch,
166 * we don't have to follow POSIX.
169 if (!strncmp(line, "--- ", 4)) {
171 err = filename(line+4, &old);
172 } else if (rename && !strncmp(line, "rename from ", 12)) {
174 err = filename(line+12, &old);
175 } else if (!strncmp(line, "+++ ", 4)) {
177 err = filename(line+4, &new);
178 } else if (!git && !strncmp(line, "blob - ", 7)) {
180 err = blobid(line + 7, &blob, git);
181 } else if (rename && !strncmp(line, "rename to ", 10)) {
183 err = filename(line + 10, &new);
184 } else if (git && !strncmp(line, "similarity index 100%", 21))
186 else if (git && !strncmp(line, "index ", 6)) {
188 err = blobid(line + 6, &blob, git);
189 } else if (!strncmp(line, "diff --git a/", 13)) {
195 } else if (!git && !strncmp(line, "diff ", 5)) {
197 err = blobid(line + 5, &commitid, git);
198 } else if (!git && !strncmp(line, "commit - ", 9)) {
200 err = blobid(line + 9, &commitid, git);
207 * Git-style diffs with "similarity index 100%" don't
208 * have any hunks and ends with the "rename to foobar"
211 if (rename && old != NULL && new != NULL) {
213 err = send_patch(old, new, commitid,
218 if (!strncmp(line, "@@ -", 4)) {
219 create = !strncmp(line+4, "0,0", 3);
220 if ((old == NULL && new == NULL) ||
221 (!create && old == NULL))
222 err = got_error(GOT_ERR_PATCH_MALFORMED);
224 err = send_patch(old, new, commitid,
230 /* rewind to previous line */
231 if (fseeko(fp, -linelen, SEEK_CUR) == -1)
232 err = got_error_from_errno("fseeko");
242 if (ferror(fp) && err == NULL)
243 err = got_error_from_errno("getline");
244 if (feof(fp) && err == NULL)
245 err = got_error(GOT_ERR_NO_PATCH);
249 static const struct got_error *
250 strtolnum(char **str, int *n)
255 for (p = *str; isdigit((unsigned char)*p); ++p)
261 *n = strtonum(*str, 0, INT_MAX, &errstr);
263 return got_error(GOT_ERR_PATCH_MALFORMED);
270 static const struct got_error *
271 parse_hdr(char *s, int *done, struct got_imsg_patch_hunk *hdr)
273 static const struct got_error *err = NULL;
275 if (strncmp(s, "@@ -", 4)) {
283 err = strtolnum(&s, &hdr->oldfrom);
288 err = strtolnum(&s, &hdr->oldlines);
297 if (*s != '+' || !*++s)
298 return got_error(GOT_ERR_PATCH_MALFORMED);
299 err = strtolnum(&s, &hdr->newfrom);
304 err = strtolnum(&s, &hdr->newlines);
314 return got_error(GOT_ERR_PATCH_MALFORMED);
316 if (hdr->oldfrom >= INT_MAX - hdr->oldlines ||
317 hdr->newfrom >= INT_MAX - hdr->newlines ||
318 /* not so sure about this one */
319 hdr->oldlines >= INT_MAX - hdr->newlines - 1 ||
320 (hdr->oldlines == 0 && hdr->newlines == 0))
321 return got_error(GOT_ERR_PATCH_MALFORMED);
323 if (hdr->oldlines == 0) {
324 /* larry says to "do append rather than insert"; I don't
325 * quite get it, but i trust him.
330 if (imsg_compose(&ibuf, GOT_IMSG_PATCH_HUNK, 0, 0, -1,
331 hdr, sizeof(*hdr)) == -1)
332 return got_error_from_errno(
333 "imsg_compose GOT_IMSG_PATCH_HUNK");
337 static const struct got_error *
338 send_line(const char *line)
340 static const struct got_error *err = NULL;
343 if (*line != '+' && *line != '-' && *line != ' ' && *line != '\\') {
344 if (asprintf(&p, " %s", line) == -1)
345 return got_error_from_errno("asprintf");
349 if (imsg_compose(&ibuf, GOT_IMSG_PATCH_LINE, 0, 0, -1,
350 line, strlen(line) + 1) == -1)
351 err = got_error_from_errno(
352 "imsg_compose GOT_IMSG_PATCH_LINE");
358 static const struct got_error *
359 peek_special_line(FILE *fp)
361 const struct got_error *err;
365 if (ch != EOF && ch != '\\') {
371 err = send_line("\\");
376 while (ch != EOF && ch != '\n')
379 if (ch != EOF || feof(fp))
381 return got_error(GOT_ERR_IO);
384 static const struct got_error *
385 parse_hunk(FILE *fp, int *done)
387 static const struct got_error *err = NULL;
388 struct got_imsg_patch_hunk hdr;
389 char *line = NULL, ch;
392 int leftold, leftnew;
394 linelen = getline(&line, &linesize, fp);
400 err = parse_hdr(line, done, &hdr);
404 if (fseeko(fp, -linelen, SEEK_CUR) == -1)
405 err = got_error_from_errno("fseeko");
409 leftold = hdr.oldlines;
410 leftnew = hdr.newlines;
412 while (leftold > 0 || leftnew > 0) {
413 linelen = getline(&line, &linesize, fp);
416 err = got_error_from_errno("getline");
420 /* trailing newlines may be chopped */
421 if (leftold < 3 && leftnew < 3) {
426 err = got_error(GOT_ERR_PATCH_TRUNCATED);
429 if (line[linelen - 1] == '\n')
430 line[linelen - 1] = '\0';
432 /* usr.bin/patch allows '=' as context char */
437 if (ch == '\t' || ch == '\0')
438 ch = ' '; /* the space got eaten */
452 err = got_error(GOT_ERR_PATCH_MALFORMED);
456 if (leftold < 0 || leftnew < 0) {
457 err = got_error(GOT_ERR_PATCH_MALFORMED);
461 err = send_line(line);
465 if ((ch == '-' && leftold == 0) ||
466 (ch == '+' && leftnew == 0)) {
467 err = peek_special_line(fp);
478 static const struct got_error *
479 read_patch(struct imsgbuf *ibuf, int fd)
481 const struct got_error *err = NULL;
485 if ((fp = fdopen(fd, "r")) == NULL) {
486 err = got_error_from_errno("fdopen");
494 err = find_patch(&done, fp);
501 err = parse_hunk(fp, &done);
506 err = send_patch_done();
514 /* ignore trailing gibberish */
515 if (err != NULL && err->code == GOT_ERR_NO_PATCH && patch_found)
522 main(int argc, char **argv)
524 const struct got_error *err = NULL;
532 imsg_init(&ibuf, GOT_IMSG_FD_CHILD);
534 /* revoke access to most system calls */
535 if (pledge("stdio recvfd", NULL) == -1) {
536 err = got_error_from_errno("pledge");
537 got_privsep_send_error(&ibuf, err);
542 err = got_privsep_recv_imsg(&imsg, &ibuf, 0);
545 if (imsg.hdr.type != GOT_IMSG_PATCH_FILE || imsg.fd == -1) {
546 err = got_error(GOT_ERR_PRIVSEP_MSG);
550 err = read_patch(&ibuf, imsg.fd);
553 if (imsg_compose(&ibuf, GOT_IMSG_PATCH_EOF, 0, 0, -1,
555 err = got_error_from_errno("imsg_compose GOT_IMSG_PATCH_EOF");
558 err = got_privsep_flush_imsg(&ibuf);
562 got_privsep_send_error(&ibuf, err);
565 if (close(GOT_IMSG_FD_CHILD) == -1 && err == NULL)
566 err = got_error_from_errno("close");
567 if (err && err->code != GOT_ERR_PRIVSEP_PIPE)
568 fprintf(stderr, "%s: %s\n", getprogname(), err->msg);