2 7b19e0f1 2017-11-05 stsp * Copyright (c) 2017 Stefan Sperling <stsp@openbsd.org>
4 7b19e0f1 2017-11-05 stsp * Permission to use, copy, modify, and distribute this software for any
5 7b19e0f1 2017-11-05 stsp * purpose with or without fee is hereby granted, provided that the above
6 7b19e0f1 2017-11-05 stsp * copyright notice and this permission notice appear in all copies.
8 7b19e0f1 2017-11-05 stsp * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 7b19e0f1 2017-11-05 stsp * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 7b19e0f1 2017-11-05 stsp * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 7b19e0f1 2017-11-05 stsp * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 7b19e0f1 2017-11-05 stsp * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 7b19e0f1 2017-11-05 stsp * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 7b19e0f1 2017-11-05 stsp * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 4027f31a 2017-11-04 stsp #include <sys/types.h>
18 d1cda826 2017-11-06 stsp #include <sys/queue.h>
20 4027f31a 2017-11-04 stsp #include <sha1.h>
21 4027f31a 2017-11-04 stsp #include <stdio.h>
22 4027f31a 2017-11-04 stsp #include <stdlib.h>
23 4027f31a 2017-11-04 stsp #include <string.h>
24 4027f31a 2017-11-04 stsp #include <util.h>
26 4027f31a 2017-11-04 stsp #include "got_error.h"
27 11995603 2017-11-05 stsp #include "got_object.h"
28 11995603 2017-11-05 stsp #include "got_repository.h"
29 4027f31a 2017-11-04 stsp #include "got_refs.h"
30 d1cda826 2017-11-06 stsp #include "got_sha1.h"
32 c3f94f68 2017-11-05 stsp #include "path.h"
35 4027f31a 2017-11-04 stsp static const struct got_error *
36 4027f31a 2017-11-04 stsp parse_symref(struct got_reference **ref, const char *name, const char *line)
38 4027f31a 2017-11-04 stsp struct got_symref *symref;
39 4027f31a 2017-11-04 stsp char *symref_name;
40 4027f31a 2017-11-04 stsp char *symref_ref;
42 4027f31a 2017-11-04 stsp if (line[0] == '\0')
43 4027f31a 2017-11-04 stsp return got_error(GOT_ERR_NOT_REF);
45 4027f31a 2017-11-04 stsp symref_name = strdup(name);
46 4027f31a 2017-11-04 stsp if (symref_name == NULL)
47 4027f31a 2017-11-04 stsp return got_error(GOT_ERR_NO_MEM);
48 4027f31a 2017-11-04 stsp symref_ref = strdup(line);
49 4027f31a 2017-11-04 stsp if (symref_ref == NULL) {
50 4027f31a 2017-11-04 stsp free(symref_name);
51 4027f31a 2017-11-04 stsp return got_error(GOT_ERR_NO_MEM);
54 4027f31a 2017-11-04 stsp *ref = calloc(1, sizeof(**ref));
55 4027f31a 2017-11-04 stsp (*ref)->flags |= GOT_REF_IS_SYMBOLIC;
56 4027f31a 2017-11-04 stsp symref = &((*ref)->ref.symref);
57 4027f31a 2017-11-04 stsp symref->name = symref_name;
58 4027f31a 2017-11-04 stsp symref->ref = symref_ref;
59 4027f31a 2017-11-04 stsp return NULL;
62 4027f31a 2017-11-04 stsp static const struct got_error *
63 4027f31a 2017-11-04 stsp parse_ref_line(struct got_reference **ref, const char *name, const char *line)
65 4027f31a 2017-11-04 stsp uint8_t digest[SHA1_DIGEST_LENGTH];
66 4027f31a 2017-11-04 stsp char *ref_name;
68 4027f31a 2017-11-04 stsp if (strncmp(line, "ref: ", 5) == 0) {
70 4027f31a 2017-11-04 stsp return parse_symref(ref, name, line);
73 4027f31a 2017-11-04 stsp ref_name = strdup(name);
74 4027f31a 2017-11-04 stsp if (ref_name == NULL)
75 4027f31a 2017-11-04 stsp return got_error(GOT_ERR_NO_MEM);
77 d1cda826 2017-11-06 stsp if (!got_parse_sha1_digest(digest, line))
78 4027f31a 2017-11-04 stsp return got_error(GOT_ERR_NOT_REF);
80 4027f31a 2017-11-04 stsp *ref = calloc(1, sizeof(**ref));
81 4027f31a 2017-11-04 stsp (*ref)->ref.ref.name = ref_name;
82 4027f31a 2017-11-04 stsp memcpy(&(*ref)->ref.ref.sha1, digest, SHA1_DIGEST_LENGTH);
83 4027f31a 2017-11-04 stsp return NULL;
86 4027f31a 2017-11-04 stsp static const struct got_error *
87 4027f31a 2017-11-04 stsp parse_ref_file(struct got_reference **ref, const char *name,
88 4027f31a 2017-11-04 stsp const char *abspath)
90 4027f31a 2017-11-04 stsp const struct got_error *err = NULL;
91 4027f31a 2017-11-04 stsp FILE *f = fopen(abspath, "rb");
94 4027f31a 2017-11-04 stsp const char delim[3] = {'\0', '\0', '\0'};
96 4027f31a 2017-11-04 stsp if (f == NULL)
97 4027f31a 2017-11-04 stsp return got_error(GOT_ERR_NOT_REF);
99 4027f31a 2017-11-04 stsp line = fparseln(f, &len, NULL, delim, 0);
100 4027f31a 2017-11-04 stsp if (line == NULL) {
101 4027f31a 2017-11-04 stsp err = got_error(GOT_ERR_NOT_REF);
105 4027f31a 2017-11-04 stsp err = parse_ref_line(ref, name, line);
107 4027f31a 2017-11-04 stsp free(line);
109 4027f31a 2017-11-04 stsp return err;
112 11995603 2017-11-05 stsp static char *
113 11995603 2017-11-05 stsp get_refs_dir_path(struct got_repository *repo, const char *refname)
115 11995603 2017-11-05 stsp if (strcmp(refname, GOT_REF_HEAD) == 0 ||
116 11995603 2017-11-05 stsp strcmp(refname, GOT_REF_ORIG_HEAD) == 0 ||
117 11995603 2017-11-05 stsp strcmp(refname, GOT_REF_MERGE_HEAD) == 0 ||
118 d4a5a885 2017-11-05 stsp strcmp(refname, GOT_REF_FETCH_HEAD) == 0 ||
119 d4a5a885 2017-11-05 stsp strncmp(refname, "refs/", 5) == 0)
120 11995603 2017-11-05 stsp return got_repo_get_path_git_dir(repo);
122 11995603 2017-11-05 stsp return got_repo_get_path_refs(repo);
125 4027f31a 2017-11-04 stsp const struct got_error *
126 11995603 2017-11-05 stsp got_ref_open(struct got_reference **ref, struct got_repository *repo,
127 4027f31a 2017-11-04 stsp const char *refname)
129 4027f31a 2017-11-04 stsp const struct got_error *err = NULL;
130 4027f31a 2017-11-04 stsp char *path_ref = NULL;
131 4027f31a 2017-11-04 stsp char *normpath = NULL;
132 4027f31a 2017-11-04 stsp const char *parent_dir;
133 11995603 2017-11-05 stsp char *path_refs = get_refs_dir_path(repo, refname);
135 11995603 2017-11-05 stsp if (path_refs == NULL) {
136 11995603 2017-11-05 stsp err = got_error(GOT_ERR_NO_MEM);
140 4027f31a 2017-11-04 stsp /* XXX For now, this assumes that refs exist in the filesystem. */
142 4027f31a 2017-11-04 stsp if (asprintf(&path_ref, "%s/%s", path_refs, refname) == -1) {
143 4027f31a 2017-11-04 stsp err = got_error(GOT_ERR_NO_MEM);
147 4027f31a 2017-11-04 stsp normpath = got_path_normalize(path_ref);
148 4027f31a 2017-11-04 stsp if (normpath == NULL) {
149 4027f31a 2017-11-04 stsp err = got_error(GOT_ERR_NOT_REF);
153 11995603 2017-11-05 stsp err = parse_ref_file(ref, refname, normpath);
155 4027f31a 2017-11-04 stsp free(normpath);
156 4027f31a 2017-11-04 stsp free(path_ref);
157 11995603 2017-11-05 stsp free(path_refs);
158 4027f31a 2017-11-04 stsp return err;
162 4027f31a 2017-11-04 stsp got_ref_close(struct got_reference *ref)
164 4027f31a 2017-11-04 stsp if (ref->flags & GOT_REF_IS_SYMBOLIC)
165 4027f31a 2017-11-04 stsp free(ref->ref.symref.name);
167 4027f31a 2017-11-04 stsp free(ref->ref.ref.name);
171 11995603 2017-11-05 stsp struct got_reference *
172 11995603 2017-11-05 stsp got_ref_dup(struct got_reference *ref)
174 11995603 2017-11-05 stsp struct got_reference *ret = calloc(1, sizeof(*ret));
175 11995603 2017-11-05 stsp char *name = NULL;
176 11995603 2017-11-05 stsp char *symref = NULL;
178 11995603 2017-11-05 stsp if (ret == NULL)
179 11995603 2017-11-05 stsp return NULL;
181 11995603 2017-11-05 stsp ret->flags = ref->flags;
182 11995603 2017-11-05 stsp if (ref->flags & GOT_REF_IS_SYMBOLIC) {
183 11995603 2017-11-05 stsp ret->ref.symref.name = strdup(ref->ref.symref.name);
184 11995603 2017-11-05 stsp if (ret->ref.symref.name == NULL) {
186 11995603 2017-11-05 stsp return NULL;
188 11995603 2017-11-05 stsp ret->ref.symref.ref = strdup(ref->ref.symref.ref);
189 11995603 2017-11-05 stsp if (ret->ref.symref.ref == NULL) {
190 11995603 2017-11-05 stsp free(ret->ref.symref.name);
192 11995603 2017-11-05 stsp return NULL;
195 11995603 2017-11-05 stsp ref->ref.ref.name = strdup(ref->ref.ref.name);
196 11995603 2017-11-05 stsp if (ref->ref.ref.name == NULL) {
198 11995603 2017-11-05 stsp return NULL;
200 11995603 2017-11-05 stsp memcpy(ret->ref.ref.sha1, ref->ref.ref.sha1,
201 11995603 2017-11-05 stsp SHA1_DIGEST_LENGTH);
204 11995603 2017-11-05 stsp return ret;
207 11995603 2017-11-05 stsp static const struct got_error *
208 11995603 2017-11-05 stsp resolve_symbolic_ref(struct got_reference **resolved,
209 11995603 2017-11-05 stsp struct got_repository *repo, struct got_reference *ref)
211 11995603 2017-11-05 stsp struct got_reference *nextref;
212 11995603 2017-11-05 stsp const struct got_error *err;
214 11995603 2017-11-05 stsp err = got_ref_open(&nextref, repo, ref->ref.symref.ref);
216 11995603 2017-11-05 stsp return err;
218 11995603 2017-11-05 stsp if (nextref->flags & GOT_REF_IS_SYMBOLIC)
219 11995603 2017-11-05 stsp err = resolve_symbolic_ref(resolved, repo, nextref);
221 11995603 2017-11-05 stsp *resolved = got_ref_dup(nextref);
223 11995603 2017-11-05 stsp got_ref_close(nextref);
224 11995603 2017-11-05 stsp return err;
227 11995603 2017-11-05 stsp const struct got_error *
228 11995603 2017-11-05 stsp got_ref_resolve(struct got_object_id **id, struct got_repository *repo,
229 11995603 2017-11-05 stsp struct got_reference *ref)
231 11995603 2017-11-05 stsp const struct got_error *err;
233 11995603 2017-11-05 stsp if (ref->flags & GOT_REF_IS_SYMBOLIC) {
234 11995603 2017-11-05 stsp struct got_reference *resolved = NULL;
235 11995603 2017-11-05 stsp err = resolve_symbolic_ref(&resolved, repo, ref);
236 11995603 2017-11-05 stsp if (err == NULL)
237 11995603 2017-11-05 stsp err = got_ref_resolve(id, repo, resolved);
238 11995603 2017-11-05 stsp free(resolved);
239 11995603 2017-11-05 stsp return err;
242 11995603 2017-11-05 stsp *id = calloc(1, sizeof(**id));
243 11995603 2017-11-05 stsp if (*id == NULL)
244 11995603 2017-11-05 stsp return got_error(GOT_ERR_NO_MEM);
245 11995603 2017-11-05 stsp memcpy((*id)->sha1, ref->ref.ref.sha1, SHA1_DIGEST_LENGTH);
246 11995603 2017-11-05 stsp return NULL;
