2 5261c201 2018-04-01 stsp * Copyright (c) 2018 Stefan Sperling <stsp@openbsd.org>
4 5261c201 2018-04-01 stsp * Permission to use, copy, modify, and distribute this software for any
5 5261c201 2018-04-01 stsp * purpose with or without fee is hereby granted, provided that the above
6 5261c201 2018-04-01 stsp * copyright notice and this permission notice appear in all copies.
8 5261c201 2018-04-01 stsp * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 5261c201 2018-04-01 stsp * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 5261c201 2018-04-01 stsp * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 5261c201 2018-04-01 stsp * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 5261c201 2018-04-01 stsp * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 5261c201 2018-04-01 stsp * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 5261c201 2018-04-01 stsp * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 5261c201 2018-04-01 stsp #include <sys/types.h>
18 5261c201 2018-04-01 stsp #include <sys/queue.h>
20 5261c201 2018-04-01 stsp #include <sha1.h>
21 5261c201 2018-04-01 stsp #include <stdio.h>
22 5261c201 2018-04-01 stsp #include <stdlib.h>
23 5261c201 2018-04-01 stsp #include <string.h>
24 5261c201 2018-04-01 stsp #include <util.h>
25 5261c201 2018-04-01 stsp #include <zlib.h>
27 5261c201 2018-04-01 stsp #include "got_error.h"
28 5261c201 2018-04-01 stsp #include "got_object.h"
29 5261c201 2018-04-01 stsp #include "got_repository.h"
30 5261c201 2018-04-01 stsp #include "got_reference.h"
32 5261c201 2018-04-01 stsp #include "got_lib_sha1.h"
33 5261c201 2018-04-01 stsp #include "got_lib_path.h"
34 5261c201 2018-04-01 stsp #include "got_lib_delta.h"
35 5261c201 2018-04-01 stsp #include "got_lib_zbuf.h"
36 5261c201 2018-04-01 stsp #include "got_lib_object.h"
38 5261c201 2018-04-01 stsp /* A symbolic reference. */
39 5261c201 2018-04-01 stsp struct got_symref {
44 5261c201 2018-04-01 stsp /* A non-symbolic reference (there is no better designation). */
45 5261c201 2018-04-01 stsp struct got_ref {
47 5261c201 2018-04-01 stsp u_int8_t sha1[SHA1_DIGEST_LENGTH];
50 5261c201 2018-04-01 stsp /* A reference which points to an arbitrary object. */
51 5261c201 2018-04-01 stsp struct got_reference {
52 5261c201 2018-04-01 stsp unsigned int flags;
53 5261c201 2018-04-01 stsp #define GOT_REF_IS_SYMBOLIC 0x01
56 5261c201 2018-04-01 stsp struct got_ref ref;
57 5261c201 2018-04-01 stsp struct got_symref symref;
61 5261c201 2018-04-01 stsp static const struct got_error *
62 5261c201 2018-04-01 stsp parse_symref(struct got_reference **ref, const char *name, const char *line)
64 5261c201 2018-04-01 stsp struct got_symref *symref;
65 5261c201 2018-04-01 stsp char *symref_name;
66 5261c201 2018-04-01 stsp char *symref_ref;
68 5261c201 2018-04-01 stsp if (line[0] == '\0')
69 5261c201 2018-04-01 stsp return got_error(GOT_ERR_NOT_REF);
71 5261c201 2018-04-01 stsp symref_name = strdup(name);
72 5261c201 2018-04-01 stsp if (symref_name == NULL)
73 5261c201 2018-04-01 stsp return got_error_from_errno();
74 5261c201 2018-04-01 stsp symref_ref = strdup(line);
75 5261c201 2018-04-01 stsp if (symref_ref == NULL) {
76 5261c201 2018-04-01 stsp const struct got_error *err = got_error_from_errno();
77 5261c201 2018-04-01 stsp free(symref_name);
81 5261c201 2018-04-01 stsp *ref = calloc(1, sizeof(**ref));
82 5261c201 2018-04-01 stsp if (*ref == NULL)
83 5261c201 2018-04-01 stsp return got_error_from_errno();
84 5261c201 2018-04-01 stsp (*ref)->flags |= GOT_REF_IS_SYMBOLIC;
85 5261c201 2018-04-01 stsp symref = &((*ref)->ref.symref);
86 5261c201 2018-04-01 stsp symref->name = symref_name;
87 5261c201 2018-04-01 stsp symref->ref = symref_ref;
88 5261c201 2018-04-01 stsp return NULL;
91 5261c201 2018-04-01 stsp static const struct got_error *
92 5261c201 2018-04-01 stsp parse_ref_line(struct got_reference **ref, const char *name, const char *line)
94 5261c201 2018-04-01 stsp uint8_t digest[SHA1_DIGEST_LENGTH];
95 5261c201 2018-04-01 stsp char *ref_name;
97 5261c201 2018-04-01 stsp if (strncmp(line, "ref: ", 5) == 0) {
99 5261c201 2018-04-01 stsp return parse_symref(ref, name, line);
102 5261c201 2018-04-01 stsp ref_name = strdup(name);
103 5261c201 2018-04-01 stsp if (ref_name == NULL)
104 5261c201 2018-04-01 stsp return got_error_from_errno();
106 5261c201 2018-04-01 stsp if (!got_parse_sha1_digest(digest, line))
107 5261c201 2018-04-01 stsp return got_error(GOT_ERR_NOT_REF);
109 5261c201 2018-04-01 stsp *ref = calloc(1, sizeof(**ref));
110 5261c201 2018-04-01 stsp if (*ref == NULL)
111 5261c201 2018-04-01 stsp return got_error_from_errno();
112 5261c201 2018-04-01 stsp (*ref)->ref.ref.name = ref_name;
113 5261c201 2018-04-01 stsp memcpy(&(*ref)->ref.ref.sha1, digest, SHA1_DIGEST_LENGTH);
114 5261c201 2018-04-01 stsp return NULL;
117 5261c201 2018-04-01 stsp static const struct got_error *
118 5261c201 2018-04-01 stsp parse_ref_file(struct got_reference **ref, const char *name,
119 5261c201 2018-04-01 stsp const char *abspath)
121 5261c201 2018-04-01 stsp const struct got_error *err = NULL;
122 5261c201 2018-04-01 stsp FILE *f = fopen(abspath, "rb");
123 5261c201 2018-04-01 stsp char *line;
124 5261c201 2018-04-01 stsp size_t len;
125 5261c201 2018-04-01 stsp const char delim[3] = {'\0', '\0', '\0'};
127 5261c201 2018-04-01 stsp if (f == NULL)
128 5261c201 2018-04-01 stsp return got_error(GOT_ERR_NOT_REF);
130 5261c201 2018-04-01 stsp line = fparseln(f, &len, NULL, delim, 0);
131 5261c201 2018-04-01 stsp if (line == NULL) {
132 5261c201 2018-04-01 stsp err = got_error(GOT_ERR_NOT_REF);
136 5261c201 2018-04-01 stsp err = parse_ref_line(ref, name, line);
138 5261c201 2018-04-01 stsp free(line);
140 5261c201 2018-04-01 stsp return err;
143 5261c201 2018-04-01 stsp static char *
144 5261c201 2018-04-01 stsp get_refs_dir_path(struct got_repository *repo, const char *refname)
146 5261c201 2018-04-01 stsp if (strcmp(refname, GOT_REF_HEAD) == 0 ||
147 5261c201 2018-04-01 stsp strcmp(refname, GOT_REF_ORIG_HEAD) == 0 ||
148 5261c201 2018-04-01 stsp strcmp(refname, GOT_REF_MERGE_HEAD) == 0 ||
149 5261c201 2018-04-01 stsp strcmp(refname, GOT_REF_FETCH_HEAD) == 0 ||
150 5261c201 2018-04-01 stsp strncmp(refname, "refs/", 5) == 0)
151 5261c201 2018-04-01 stsp return got_repo_get_path_git_dir(repo);
153 5261c201 2018-04-01 stsp return got_repo_get_path_refs(repo);
156 5261c201 2018-04-01 stsp const struct got_error *
157 5261c201 2018-04-01 stsp got_ref_open(struct got_reference **ref, struct got_repository *repo,
158 5261c201 2018-04-01 stsp const char *refname)
160 5261c201 2018-04-01 stsp const struct got_error *err = NULL;
161 5261c201 2018-04-01 stsp char *path_ref = NULL;
162 5261c201 2018-04-01 stsp char *normpath = NULL;
163 5261c201 2018-04-01 stsp char *path_refs = get_refs_dir_path(repo, refname);
165 5261c201 2018-04-01 stsp if (path_refs == NULL) {
166 5261c201 2018-04-01 stsp err = got_error_from_errno();
170 5261c201 2018-04-01 stsp /* XXX For now, this assumes that refs exist in the filesystem. */
172 5261c201 2018-04-01 stsp if (asprintf(&path_ref, "%s/%s", path_refs, refname) == -1) {
173 5261c201 2018-04-01 stsp err = got_error_from_errno();
177 5261c201 2018-04-01 stsp normpath = got_path_normalize(path_ref);
178 5261c201 2018-04-01 stsp if (normpath == NULL) {
179 5261c201 2018-04-01 stsp err = got_error(GOT_ERR_NOT_REF);
183 5261c201 2018-04-01 stsp err = parse_ref_file(ref, refname, normpath);
185 5261c201 2018-04-01 stsp free(normpath);
186 5261c201 2018-04-01 stsp free(path_ref);
187 5261c201 2018-04-01 stsp free(path_refs);
188 5261c201 2018-04-01 stsp return err;
192 5261c201 2018-04-01 stsp got_ref_close(struct got_reference *ref)
194 5261c201 2018-04-01 stsp if (ref->flags & GOT_REF_IS_SYMBOLIC)
195 5261c201 2018-04-01 stsp free(ref->ref.symref.name);
197 5261c201 2018-04-01 stsp free(ref->ref.ref.name);
201 5261c201 2018-04-01 stsp struct got_reference *
202 5261c201 2018-04-01 stsp got_ref_dup(struct got_reference *ref)
204 5261c201 2018-04-01 stsp struct got_reference *ret;
206 5261c201 2018-04-01 stsp ret = calloc(1, sizeof(*ret));
207 5261c201 2018-04-01 stsp if (ret == NULL)
208 5261c201 2018-04-01 stsp return NULL;
210 5261c201 2018-04-01 stsp ret->flags = ref->flags;
211 5261c201 2018-04-01 stsp if (ref->flags & GOT_REF_IS_SYMBOLIC) {
212 5261c201 2018-04-01 stsp ret->ref.symref.name = strdup(ref->ref.symref.name);
213 5261c201 2018-04-01 stsp if (ret->ref.symref.name == NULL) {
215 5261c201 2018-04-01 stsp return NULL;
217 5261c201 2018-04-01 stsp ret->ref.symref.ref = strdup(ref->ref.symref.ref);
218 5261c201 2018-04-01 stsp if (ret->ref.symref.ref == NULL) {
219 5261c201 2018-04-01 stsp free(ret->ref.symref.name);
221 5261c201 2018-04-01 stsp return NULL;
224 5261c201 2018-04-01 stsp ref->ref.ref.name = strdup(ref->ref.ref.name);
225 5261c201 2018-04-01 stsp if (ref->ref.ref.name == NULL) {
227 5261c201 2018-04-01 stsp return NULL;
229 5261c201 2018-04-01 stsp memcpy(ret->ref.ref.sha1, ref->ref.ref.sha1,
230 5261c201 2018-04-01 stsp SHA1_DIGEST_LENGTH);
233 5261c201 2018-04-01 stsp return ret;
236 5261c201 2018-04-01 stsp static const struct got_error *
237 5261c201 2018-04-01 stsp resolve_symbolic_ref(struct got_reference **resolved,
238 5261c201 2018-04-01 stsp struct got_repository *repo, struct got_reference *ref)
240 5261c201 2018-04-01 stsp struct got_reference *nextref;
241 5261c201 2018-04-01 stsp const struct got_error *err;
243 5261c201 2018-04-01 stsp err = got_ref_open(&nextref, repo, ref->ref.symref.ref);
245 5261c201 2018-04-01 stsp return err;
247 5261c201 2018-04-01 stsp if (nextref->flags & GOT_REF_IS_SYMBOLIC)
248 5261c201 2018-04-01 stsp err = resolve_symbolic_ref(resolved, repo, nextref);
250 5261c201 2018-04-01 stsp *resolved = got_ref_dup(nextref);
252 5261c201 2018-04-01 stsp got_ref_close(nextref);
253 5261c201 2018-04-01 stsp return err;
256 5261c201 2018-04-01 stsp const struct got_error *
257 5261c201 2018-04-01 stsp got_ref_resolve(struct got_object_id **id, struct got_repository *repo,
258 5261c201 2018-04-01 stsp struct got_reference *ref)
260 5261c201 2018-04-01 stsp const struct got_error *err;
262 5261c201 2018-04-01 stsp if (ref->flags & GOT_REF_IS_SYMBOLIC) {
263 5261c201 2018-04-01 stsp struct got_reference *resolved = NULL;
264 5261c201 2018-04-01 stsp err = resolve_symbolic_ref(&resolved, repo, ref);
265 5261c201 2018-04-01 stsp if (err == NULL)
266 5261c201 2018-04-01 stsp err = got_ref_resolve(id, repo, resolved);
267 5261c201 2018-04-01 stsp free(resolved);
268 5261c201 2018-04-01 stsp return err;
271 5261c201 2018-04-01 stsp *id = calloc(1, sizeof(**id));
272 5261c201 2018-04-01 stsp if (*id == NULL)
273 5261c201 2018-04-01 stsp return got_error_from_errno();
274 5261c201 2018-04-01 stsp memcpy((*id)->sha1, ref->ref.ref.sha1, SHA1_DIGEST_LENGTH);
275 5261c201 2018-04-01 stsp return NULL;
279 5261c201 2018-04-01 stsp got_ref_to_str(struct got_reference *ref)
282 5261c201 2018-04-01 stsp if (ref->flags & GOT_REF_IS_SYMBOLIC) {
283 5261c201 2018-04-01 stsp if (asprintf(&str, "ref: %s", ref->ref.symref.ref) == -1)
284 5261c201 2018-04-01 stsp return NULL;
286 5261c201 2018-04-01 stsp str = calloc(1, SHA1_DIGEST_STRING_LENGTH);
287 5261c201 2018-04-01 stsp if (str == NULL)
288 5261c201 2018-04-01 stsp return NULL;
289 5261c201 2018-04-01 stsp str = got_sha1_digest_to_str(ref->ref.ref.sha1, str,
290 5261c201 2018-04-01 stsp SHA1_DIGEST_STRING_LENGTH);
293 5261c201 2018-04-01 stsp return str;