2 * Copyright (c) 2018 Stefan Sperling <stsp@openbsd.org>
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.
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.
17 #include <sys/types.h>
18 #include <sys/queue.h>
27 #include "got_error.h"
28 #include "got_object.h"
29 #include "got_repository.h"
30 #include "got_reference.h"
32 #include "got_lib_sha1.h"
33 #include "got_lib_path.h"
34 #include "got_lib_delta.h"
35 #include "got_lib_zbuf.h"
36 #include "got_lib_object.h"
38 /* A symbolic reference. */
44 /* A non-symbolic reference (there is no better designation). */
47 u_int8_t sha1[SHA1_DIGEST_LENGTH];
50 /* A reference which points to an arbitrary object. */
51 struct got_reference {
53 #define GOT_REF_IS_SYMBOLIC 0x01
57 struct got_symref symref;
61 static const struct got_error *
62 parse_symref(struct got_reference **ref, const char *name, const char *line)
64 struct got_symref *symref;
69 return got_error(GOT_ERR_NOT_REF);
71 symref_name = strdup(name);
72 if (symref_name == NULL)
73 return got_error_from_errno();
74 symref_ref = strdup(line);
75 if (symref_ref == NULL) {
76 const struct got_error *err = got_error_from_errno();
81 *ref = calloc(1, sizeof(**ref));
83 return got_error_from_errno();
84 (*ref)->flags |= GOT_REF_IS_SYMBOLIC;
85 symref = &((*ref)->ref.symref);
86 symref->name = symref_name;
87 symref->ref = symref_ref;
91 static const struct got_error *
92 parse_ref_line(struct got_reference **ref, const char *name, const char *line)
94 uint8_t digest[SHA1_DIGEST_LENGTH];
97 if (strncmp(line, "ref: ", 5) == 0) {
99 return parse_symref(ref, name, line);
102 ref_name = strdup(name);
103 if (ref_name == NULL)
104 return got_error_from_errno();
106 if (!got_parse_sha1_digest(digest, line))
107 return got_error(GOT_ERR_NOT_REF);
109 *ref = calloc(1, sizeof(**ref));
111 return got_error_from_errno();
112 (*ref)->ref.ref.name = ref_name;
113 memcpy(&(*ref)->ref.ref.sha1, digest, SHA1_DIGEST_LENGTH);
117 static const struct got_error *
118 parse_ref_file(struct got_reference **ref, const char *name,
121 const struct got_error *err = NULL;
122 FILE *f = fopen(abspath, "rb");
125 const char delim[3] = {'\0', '\0', '\0'};
128 return got_error(GOT_ERR_NOT_REF);
130 line = fparseln(f, &len, NULL, delim, 0);
132 err = got_error(GOT_ERR_NOT_REF);
136 err = parse_ref_line(ref, name, line);
144 get_refs_dir_path(struct got_repository *repo, const char *refname)
146 if (strcmp(refname, GOT_REF_HEAD) == 0 ||
147 strcmp(refname, GOT_REF_ORIG_HEAD) == 0 ||
148 strcmp(refname, GOT_REF_MERGE_HEAD) == 0 ||
149 strcmp(refname, GOT_REF_FETCH_HEAD) == 0 ||
150 strncmp(refname, "refs/", 5) == 0)
151 return got_repo_get_path_git_dir(repo);
153 return got_repo_get_path_refs(repo);
156 const struct got_error *
157 got_ref_open(struct got_reference **ref, struct got_repository *repo,
160 const struct got_error *err = NULL;
161 char *path_ref = NULL;
162 char *normpath = NULL;
163 char *path_refs = get_refs_dir_path(repo, refname);
165 if (path_refs == NULL) {
166 err = got_error_from_errno();
170 /* XXX For now, this assumes that refs exist in the filesystem. */
172 if (asprintf(&path_ref, "%s/%s", path_refs, refname) == -1) {
173 err = got_error_from_errno();
177 normpath = got_path_normalize(path_ref);
178 if (normpath == NULL) {
179 err = got_error(GOT_ERR_NOT_REF);
183 err = parse_ref_file(ref, refname, normpath);
192 got_ref_close(struct got_reference *ref)
194 if (ref->flags & GOT_REF_IS_SYMBOLIC)
195 free(ref->ref.symref.name);
197 free(ref->ref.ref.name);
201 struct got_reference *
202 got_ref_dup(struct got_reference *ref)
204 struct got_reference *ret;
206 ret = calloc(1, sizeof(*ret));
210 ret->flags = ref->flags;
211 if (ref->flags & GOT_REF_IS_SYMBOLIC) {
212 ret->ref.symref.name = strdup(ref->ref.symref.name);
213 if (ret->ref.symref.name == NULL) {
217 ret->ref.symref.ref = strdup(ref->ref.symref.ref);
218 if (ret->ref.symref.ref == NULL) {
219 free(ret->ref.symref.name);
224 ref->ref.ref.name = strdup(ref->ref.ref.name);
225 if (ref->ref.ref.name == NULL) {
229 memcpy(ret->ref.ref.sha1, ref->ref.ref.sha1,
236 static const struct got_error *
237 resolve_symbolic_ref(struct got_reference **resolved,
238 struct got_repository *repo, struct got_reference *ref)
240 struct got_reference *nextref;
241 const struct got_error *err;
243 err = got_ref_open(&nextref, repo, ref->ref.symref.ref);
247 if (nextref->flags & GOT_REF_IS_SYMBOLIC)
248 err = resolve_symbolic_ref(resolved, repo, nextref);
250 *resolved = got_ref_dup(nextref);
252 got_ref_close(nextref);
256 const struct got_error *
257 got_ref_resolve(struct got_object_id **id, struct got_repository *repo,
258 struct got_reference *ref)
260 const struct got_error *err;
262 if (ref->flags & GOT_REF_IS_SYMBOLIC) {
263 struct got_reference *resolved = NULL;
264 err = resolve_symbolic_ref(&resolved, repo, ref);
266 err = got_ref_resolve(id, repo, resolved);
271 *id = calloc(1, sizeof(**id));
273 return got_error_from_errno();
274 memcpy((*id)->sha1, ref->ref.ref.sha1, SHA1_DIGEST_LENGTH);
279 got_ref_to_str(struct got_reference *ref)
282 if (ref->flags & GOT_REF_IS_SYMBOLIC) {
283 if (asprintf(&str, "ref: %s", ref->ref.symref.ref) == -1)
286 str = calloc(1, SHA1_DIGEST_STRING_LENGTH);
289 str = got_sha1_digest_to_str(ref->ref.ref.sha1, str,
290 SHA1_DIGEST_STRING_LENGTH);