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>
25 68482ea3 2017-11-27 stsp #include <zlib.h>
27 4027f31a 2017-11-04 stsp #include "got_error.h"
28 11995603 2017-11-05 stsp #include "got_object.h"
29 11995603 2017-11-05 stsp #include "got_repository.h"
30 4027f31a 2017-11-04 stsp #include "got_refs.h"
31 d1cda826 2017-11-06 stsp #include "got_sha1.h"
33 c3f94f68 2017-11-05 stsp #include "path.h"
36 4027f31a 2017-11-04 stsp static const struct got_error *
37 4027f31a 2017-11-04 stsp parse_symref(struct got_reference **ref, const char *name, const char *line)
39 4027f31a 2017-11-04 stsp struct got_symref *symref;
40 4027f31a 2017-11-04 stsp char *symref_name;
41 4027f31a 2017-11-04 stsp char *symref_ref;
43 4027f31a 2017-11-04 stsp if (line[0] == '\0')
44 4027f31a 2017-11-04 stsp return got_error(GOT_ERR_NOT_REF);
46 4027f31a 2017-11-04 stsp symref_name = strdup(name);
47 4027f31a 2017-11-04 stsp if (symref_name == NULL)
48 4027f31a 2017-11-04 stsp return got_error(GOT_ERR_NO_MEM);
49 4027f31a 2017-11-04 stsp symref_ref = strdup(line);
50 4027f31a 2017-11-04 stsp if (symref_ref == NULL) {
51 4027f31a 2017-11-04 stsp free(symref_name);
52 4027f31a 2017-11-04 stsp return got_error(GOT_ERR_NO_MEM);
55 4027f31a 2017-11-04 stsp *ref = calloc(1, sizeof(**ref));
56 1db76ab5 2018-01-26 mpi if (*ref == NULL)
57 1db76ab5 2018-01-26 mpi return got_error(GOT_ERR_NO_MEM);
58 4027f31a 2017-11-04 stsp (*ref)->flags |= GOT_REF_IS_SYMBOLIC;
59 4027f31a 2017-11-04 stsp symref = &((*ref)->ref.symref);
60 4027f31a 2017-11-04 stsp symref->name = symref_name;
61 4027f31a 2017-11-04 stsp symref->ref = symref_ref;
62 4027f31a 2017-11-04 stsp return NULL;
65 4027f31a 2017-11-04 stsp static const struct got_error *
66 4027f31a 2017-11-04 stsp parse_ref_line(struct got_reference **ref, const char *name, const char *line)
68 4027f31a 2017-11-04 stsp uint8_t digest[SHA1_DIGEST_LENGTH];
69 4027f31a 2017-11-04 stsp char *ref_name;
71 4027f31a 2017-11-04 stsp if (strncmp(line, "ref: ", 5) == 0) {
73 4027f31a 2017-11-04 stsp return parse_symref(ref, name, line);
76 4027f31a 2017-11-04 stsp ref_name = strdup(name);
77 4027f31a 2017-11-04 stsp if (ref_name == NULL)
78 4027f31a 2017-11-04 stsp return got_error(GOT_ERR_NO_MEM);
80 d1cda826 2017-11-06 stsp if (!got_parse_sha1_digest(digest, line))
81 4027f31a 2017-11-04 stsp return got_error(GOT_ERR_NOT_REF);
83 4027f31a 2017-11-04 stsp *ref = calloc(1, sizeof(**ref));
84 1db76ab5 2018-01-26 mpi if (*ref == NULL)
85 1db76ab5 2018-01-26 mpi return got_error(GOT_ERR_NO_MEM);
86 4027f31a 2017-11-04 stsp (*ref)->ref.ref.name = ref_name;
87 4027f31a 2017-11-04 stsp memcpy(&(*ref)->ref.ref.sha1, digest, SHA1_DIGEST_LENGTH);
88 4027f31a 2017-11-04 stsp return NULL;
91 4027f31a 2017-11-04 stsp static const struct got_error *
92 4027f31a 2017-11-04 stsp parse_ref_file(struct got_reference **ref, const char *name,
93 4027f31a 2017-11-04 stsp const char *abspath)
95 4027f31a 2017-11-04 stsp const struct got_error *err = NULL;
96 4027f31a 2017-11-04 stsp FILE *f = fopen(abspath, "rb");
99 4027f31a 2017-11-04 stsp const char delim[3] = {'\0', '\0', '\0'};
101 4027f31a 2017-11-04 stsp if (f == NULL)
102 4027f31a 2017-11-04 stsp return got_error(GOT_ERR_NOT_REF);
104 4027f31a 2017-11-04 stsp line = fparseln(f, &len, NULL, delim, 0);
105 4027f31a 2017-11-04 stsp if (line == NULL) {
106 4027f31a 2017-11-04 stsp err = got_error(GOT_ERR_NOT_REF);
110 4027f31a 2017-11-04 stsp err = parse_ref_line(ref, name, line);
112 4027f31a 2017-11-04 stsp free(line);
114 4027f31a 2017-11-04 stsp return err;
117 11995603 2017-11-05 stsp static char *
118 11995603 2017-11-05 stsp get_refs_dir_path(struct got_repository *repo, const char *refname)
120 11995603 2017-11-05 stsp if (strcmp(refname, GOT_REF_HEAD) == 0 ||
121 11995603 2017-11-05 stsp strcmp(refname, GOT_REF_ORIG_HEAD) == 0 ||
122 11995603 2017-11-05 stsp strcmp(refname, GOT_REF_MERGE_HEAD) == 0 ||
123 d4a5a885 2017-11-05 stsp strcmp(refname, GOT_REF_FETCH_HEAD) == 0 ||
124 d4a5a885 2017-11-05 stsp strncmp(refname, "refs/", 5) == 0)
125 11995603 2017-11-05 stsp return got_repo_get_path_git_dir(repo);
127 11995603 2017-11-05 stsp return got_repo_get_path_refs(repo);
130 4027f31a 2017-11-04 stsp const struct got_error *
131 11995603 2017-11-05 stsp got_ref_open(struct got_reference **ref, struct got_repository *repo,
132 4027f31a 2017-11-04 stsp const char *refname)
134 4027f31a 2017-11-04 stsp const struct got_error *err = NULL;
135 4027f31a 2017-11-04 stsp char *path_ref = NULL;
136 4027f31a 2017-11-04 stsp char *normpath = NULL;
137 4027f31a 2017-11-04 stsp const char *parent_dir;
138 11995603 2017-11-05 stsp char *path_refs = get_refs_dir_path(repo, refname);
140 11995603 2017-11-05 stsp if (path_refs == NULL) {
141 11995603 2017-11-05 stsp err = got_error(GOT_ERR_NO_MEM);
145 4027f31a 2017-11-04 stsp /* XXX For now, this assumes that refs exist in the filesystem. */
147 4027f31a 2017-11-04 stsp if (asprintf(&path_ref, "%s/%s", path_refs, refname) == -1) {
148 4027f31a 2017-11-04 stsp err = got_error(GOT_ERR_NO_MEM);
152 4027f31a 2017-11-04 stsp normpath = got_path_normalize(path_ref);
153 4027f31a 2017-11-04 stsp if (normpath == NULL) {
154 4027f31a 2017-11-04 stsp err = got_error(GOT_ERR_NOT_REF);
158 11995603 2017-11-05 stsp err = parse_ref_file(ref, refname, normpath);
160 4027f31a 2017-11-04 stsp free(normpath);
161 4027f31a 2017-11-04 stsp free(path_ref);
162 11995603 2017-11-05 stsp free(path_refs);
163 4027f31a 2017-11-04 stsp return err;
167 4027f31a 2017-11-04 stsp got_ref_close(struct got_reference *ref)
169 4027f31a 2017-11-04 stsp if (ref->flags & GOT_REF_IS_SYMBOLIC)
170 4027f31a 2017-11-04 stsp free(ref->ref.symref.name);
172 4027f31a 2017-11-04 stsp free(ref->ref.ref.name);
176 11995603 2017-11-05 stsp struct got_reference *
177 11995603 2017-11-05 stsp got_ref_dup(struct got_reference *ref)
179 1db76ab5 2018-01-26 mpi struct got_reference *ret;
180 11995603 2017-11-05 stsp char *name = NULL;
181 11995603 2017-11-05 stsp char *symref = NULL;
183 1db76ab5 2018-01-26 mpi ret = calloc(1, sizeof(*ret));
184 11995603 2017-11-05 stsp if (ret == NULL)
185 11995603 2017-11-05 stsp return NULL;
187 11995603 2017-11-05 stsp ret->flags = ref->flags;
188 11995603 2017-11-05 stsp if (ref->flags & GOT_REF_IS_SYMBOLIC) {
189 11995603 2017-11-05 stsp ret->ref.symref.name = strdup(ref->ref.symref.name);
190 11995603 2017-11-05 stsp if (ret->ref.symref.name == NULL) {
192 11995603 2017-11-05 stsp return NULL;
194 11995603 2017-11-05 stsp ret->ref.symref.ref = strdup(ref->ref.symref.ref);
195 11995603 2017-11-05 stsp if (ret->ref.symref.ref == NULL) {
196 11995603 2017-11-05 stsp free(ret->ref.symref.name);
198 11995603 2017-11-05 stsp return NULL;
201 11995603 2017-11-05 stsp ref->ref.ref.name = strdup(ref->ref.ref.name);
202 11995603 2017-11-05 stsp if (ref->ref.ref.name == NULL) {
204 11995603 2017-11-05 stsp return NULL;
206 11995603 2017-11-05 stsp memcpy(ret->ref.ref.sha1, ref->ref.ref.sha1,
207 11995603 2017-11-05 stsp SHA1_DIGEST_LENGTH);
210 11995603 2017-11-05 stsp return ret;
213 11995603 2017-11-05 stsp static const struct got_error *
214 11995603 2017-11-05 stsp resolve_symbolic_ref(struct got_reference **resolved,
215 11995603 2017-11-05 stsp struct got_repository *repo, struct got_reference *ref)
217 11995603 2017-11-05 stsp struct got_reference *nextref;
218 11995603 2017-11-05 stsp const struct got_error *err;
220 11995603 2017-11-05 stsp err = got_ref_open(&nextref, repo, ref->ref.symref.ref);
222 11995603 2017-11-05 stsp return err;
224 11995603 2017-11-05 stsp if (nextref->flags & GOT_REF_IS_SYMBOLIC)
225 11995603 2017-11-05 stsp err = resolve_symbolic_ref(resolved, repo, nextref);
227 11995603 2017-11-05 stsp *resolved = got_ref_dup(nextref);
229 11995603 2017-11-05 stsp got_ref_close(nextref);
230 11995603 2017-11-05 stsp return err;
233 11995603 2017-11-05 stsp const struct got_error *
234 11995603 2017-11-05 stsp got_ref_resolve(struct got_object_id **id, struct got_repository *repo,
235 11995603 2017-11-05 stsp struct got_reference *ref)
237 11995603 2017-11-05 stsp const struct got_error *err;
239 11995603 2017-11-05 stsp if (ref->flags & GOT_REF_IS_SYMBOLIC) {
240 11995603 2017-11-05 stsp struct got_reference *resolved = NULL;
241 11995603 2017-11-05 stsp err = resolve_symbolic_ref(&resolved, repo, ref);
242 11995603 2017-11-05 stsp if (err == NULL)
243 11995603 2017-11-05 stsp err = got_ref_resolve(id, repo, resolved);
244 11995603 2017-11-05 stsp free(resolved);
245 11995603 2017-11-05 stsp return err;
248 11995603 2017-11-05 stsp *id = calloc(1, sizeof(**id));
249 11995603 2017-11-05 stsp if (*id == NULL)
250 11995603 2017-11-05 stsp return got_error(GOT_ERR_NO_MEM);
251 11995603 2017-11-05 stsp memcpy((*id)->sha1, ref->ref.ref.sha1, SHA1_DIGEST_LENGTH);
252 11995603 2017-11-05 stsp return NULL;
