1 /*
2  * Copyright (c) 2019 Stefan Sperling <stsp@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/stat.h>
19 #include <sys/queue.h>
20 
21 #include <errno.h>
22 #include <fcntl.h>
23 #include <stdio.h>
24 #include <stdlib.h>
25 #include <string.h>
26 #include <stdint.h>
27 #include <sha1.h>
28 #include <unistd.h>
29 #include <zlib.h>
30 
31 #include "got_error.h"
32 #include "got_object.h"
33 #include "got_repository.h"
34 #include "got_opentemp.h"
35 
36 #include "got_lib_sha1.h"
37 #include "got_lib_deflate.h"
38 #include "got_lib_delta.h"
39 #include "got_lib_object.h"
40 #include "got_lib_lockfile.h"
41 #include "got_lib_path.h"
42 
43 #ifndef nitems
44 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
45 #endif
46 
47 static const struct got_error *
48 create_object_file(struct got_object_id *id, FILE *content,
49     struct got_repository *repo)
50 {
51 	const struct got_error *err = NULL, *unlock_err = NULL;
52 	char *objpath = NULL, *tmppath = NULL;
53 	FILE *tmpfile = NULL;
54 	struct got_lockfile *lf = NULL;
55 	size_t tmplen = 0;
56 
57 	err = got_object_get_path(&objpath, id, repo);
58 	if (err)
59 		return err;
60 
61 	err = got_opentemp_named(&tmppath, &tmpfile, objpath);
62 	if (err) {
63 		char *parent_path;
64 		if (!(err->code == GOT_ERR_ERRNO && errno == ENOENT))
65 			goto done;
66 		err = got_path_dirname(&parent_path, objpath);
67 		if (err)
68 			goto done;
69 		err = got_path_mkdir(parent_path);
70 		free(parent_path);
71 		if (err)
72 			goto done;
73 		err = got_opentemp_named(&tmppath, &tmpfile, objpath);
74 		if (err)
75 			goto done;
76 	}
77 
78 	err = got_deflate_to_file(&tmplen, content, tmpfile);
79 	if (err)
80 		goto done;
81 
82 	err = got_lockfile_lock(&lf, objpath);
83 	if (err)
84 		goto done;
85 
86 	if (rename(tmppath, objpath) != 0) {
87 		err = got_error_from_errno();
88 		goto done;
89 	}
90 	free(tmppath);
91 	tmppath = NULL;
92 
93 	if (chmod(objpath, GOT_DEFAULT_FILE_MODE) != 0) {
94 		err = got_error_from_errno();
95 		goto done;
96 	}
97 done:
98 	free(objpath);
99 	if (tmppath) {
100 		if (unlink(tmppath) != 0 && err == NULL)
101 			err = got_error_from_errno();
102 		free(tmppath);
103 	}
104 	if (tmpfile && fclose(tmpfile) != 0 && err == NULL)
105 		err = got_error_from_errno();
106 	if (lf)
107 		unlock_err = got_lockfile_unlock(lf);
108 	return err ? err : unlock_err;
109 }
110 
111 const struct got_error *
112 got_object_blob_create(struct got_object_id **id, const char *ondisk_path,
113     struct got_repository *repo)
114 {
115 	const struct got_error *err = NULL;
116 	char *header = NULL;
117 	FILE *blobfile = NULL;
118 	int fd = -1;
119 	struct stat sb;
120 	SHA1_CTX sha1_ctx;
121 	size_t headerlen = 0, n;
122 
123 	*id = NULL;
124 
125 	SHA1Init(&sha1_ctx);
126 
127 	fd = open(ondisk_path, O_RDONLY | O_NOFOLLOW);
128 	if (fd == -1)
129 		return got_error_from_errno();
130 
131 	if (fstat(fd, &sb) == -1) {
132 		err = got_error_from_errno();
133 		goto done;
134 	}
135 
136 	if (asprintf(&header, "%s %lld", GOT_OBJ_LABEL_BLOB,
137 		sb.st_size) == -1) {
138 		err = got_error_from_errno();
139 		goto done;
140 	}
141 	headerlen = strlen(header) + 1;
142 	SHA1Update(&sha1_ctx, header, headerlen);
143 
144 	blobfile = got_opentemp();
145 	if (blobfile == NULL) {
146 		err = got_error_from_errno();
147 		goto done;
148 	}
149 
150 	n = fwrite(header, 1, headerlen, blobfile);
151 	if (n != headerlen) {
152 		err = got_ferror(blobfile, GOT_ERR_IO);
153 		goto done;
154 	}
155 	while (1) {
156 		char buf[8192];
157 		ssize_t inlen;
158 
159 		inlen = read(fd, buf, sizeof(buf));
160 		if (inlen == -1) {
161 			err = got_error_from_errno();
162 			goto done;
163 		}
164 		if (inlen == 0)
165 			break; /* EOF */
166 		SHA1Update(&sha1_ctx, buf, inlen);
167 		n = fwrite(buf, 1, inlen, blobfile);
168 		if (n != inlen) {
169 			err = got_ferror(blobfile, GOT_ERR_IO);
170 			goto done;
171 		}
172 	}
173 
174 	*id = malloc(sizeof(**id));
175 	if (*id == NULL) {
176 		err = got_error_from_errno();
177 		goto done;
178 	}
179 	SHA1Final((*id)->sha1, &sha1_ctx);
180 
181 	if (fflush(blobfile) != 0) {
182 		err = got_error_from_errno();
183 		goto done;
184 	}
185 	rewind(blobfile);
186 
187 	err = create_object_file(*id, blobfile, repo);
188 done:
189 	free(header);
190 	if (fd != -1 && close(fd) != 0 && err == NULL)
191 		err = got_error_from_errno();
192 	if (blobfile && fclose(blobfile) != 0 && err == NULL)
193 		err = got_error_from_errno();
194 	if (err) {
195 		free(*id);
196 		*id = NULL;
197 	}
198 	return err;
199 }
200 
201 static const struct got_error *
202 mode2str(char *buf, size_t len, mode_t mode)
203 {
204 	int ret;
205 	ret = snprintf(buf, len, "%o ", mode);
206 	if (ret == -1 || ret >= len)
207 		return got_error(GOT_ERR_NO_SPACE);
208 	return NULL;
209 }
210 
211 const struct got_error *
212 got_object_tree_create(struct got_object_id **id,
213     struct got_tree_entries *entries, struct got_repository *repo)
214 {
215 	const struct got_error *err = NULL;
216 	char modebuf[sizeof("100644 ")];
217 	SHA1_CTX sha1_ctx;
218 	char *header = NULL;
219 	size_t headerlen, len = 0, n;
220 	FILE *treefile = NULL;
221 	struct got_tree_entry *te;
222 
223 	*id = NULL;
224 
225 	SIMPLEQ_FOREACH(te, &entries->head, entry) {
226 		err = mode2str(modebuf, sizeof(modebuf), te->mode);
227 		if (err)
228 			return err;
229 		len += strlen(modebuf) + strlen(te->name) + 1 +
230 		    SHA1_DIGEST_LENGTH;
231 	}
232 
233 	if (asprintf(&header, "%s %zd", GOT_OBJ_LABEL_TREE, len) == -1) {
234 		err = got_error_from_errno();
235 		goto done;
236 	}
237 	headerlen = strlen(header) + 1;
238 	SHA1Update(&sha1_ctx, header, headerlen);
239 
240 	treefile = got_opentemp();
241 	if (treefile == NULL) {
242 		err = got_error_from_errno();
243 		goto done;
244 	}
245 
246 	n = fwrite(header, 1, headerlen, treefile);
247 	if (n != headerlen) {
248 		err = got_ferror(treefile, GOT_ERR_IO);
249 		goto done;
250 	}
251 
252 	SIMPLEQ_FOREACH(te, &entries->head, entry) {
253 		err = mode2str(modebuf, sizeof(modebuf), te->mode);
254 		if (err)
255 			goto done;
256 		len = strlen(modebuf);
257 		n = fwrite(modebuf, 1, len, treefile);
258 		if (n != len) {
259 			err = got_ferror(treefile, GOT_ERR_IO);
260 			goto done;
261 		}
262 		SHA1Update(&sha1_ctx, modebuf, len);
263 
264 		len = strlen(te->name) + 1; /* must include NUL */
265 		n = fwrite(te->name, 1, len, treefile);
266 		if (n != len) {
267 			err = got_ferror(treefile, GOT_ERR_IO);
268 			goto done;
269 		}
270 		SHA1Update(&sha1_ctx, te->name, len);
271 
272 		len = SHA1_DIGEST_LENGTH;
273 		n = fwrite(te->id->sha1, 1, len, treefile);
274 		if (n != len) {
275 			err = got_ferror(treefile, GOT_ERR_IO);
276 			goto done;
277 		}
278 		SHA1Update(&sha1_ctx, te->id->sha1, len);
279 	}
280 
281 	*id = malloc(sizeof(**id));
282 	if (*id == NULL) {
283 		err = got_error_from_errno();
284 		goto done;
285 	}
286 	SHA1Final((*id)->sha1, &sha1_ctx);
287 
288 	if (fflush(treefile) != 0) {
289 		err = got_error_from_errno();
290 		goto done;
291 	}
292 	rewind(treefile);
293 
294 	err = create_object_file(*id, treefile, repo);
295 done:
296 	free(header);
297 	if (treefile && fclose(treefile) != 0 && err == NULL)
298 		err = got_error_from_errno();
299 	if (err) {
300 		free(*id);
301 		*id = NULL;
302 	}
303 	return err;
304 }