1 7b19e0f1 2017-11-05 stsp /*
  2 7b19e0f1 2017-11-05 stsp  * Copyright (c) 2017 Stefan Sperling <stsp@openbsd.org>
  3 7b19e0f1 2017-11-05 stsp  *
  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.
  7 7b19e0f1 2017-11-05 stsp  *
  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.
 15 7b19e0f1 2017-11-05 stsp  */
 16 7b19e0f1 2017-11-05 stsp 
 17 4027f31a 2017-11-04 stsp #include <sys/types.h>
 18 d1cda826 2017-11-06 stsp #include <sys/queue.h>
 19 d1cda826 2017-11-06 stsp 
 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>
 26 4027f31a 2017-11-04 stsp 
 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"
 32 4027f31a 2017-11-04 stsp 
 33 c3f94f68 2017-11-05 stsp #include "path.h"
 34 c3f94f68 2017-11-05 stsp 
 35 11995603 2017-11-05 stsp 
 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)
 38 4027f31a 2017-11-04 stsp {
 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;
 42 4027f31a 2017-11-04 stsp 
 43 4027f31a 2017-11-04 stsp 	if (line[0] == '\0')
 44 4027f31a 2017-11-04 stsp 		return got_error(GOT_ERR_NOT_REF);
 45 4027f31a 2017-11-04 stsp 
 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);
 53 4027f31a 2017-11-04 stsp 	}
 54 4027f31a 2017-11-04 stsp 
 55 4027f31a 2017-11-04 stsp 	*ref = calloc(1, sizeof(**ref));
 56 4027f31a 2017-11-04 stsp 	(*ref)->flags |= GOT_REF_IS_SYMBOLIC;
 57 4027f31a 2017-11-04 stsp 	symref = &((*ref)->ref.symref);
 58 4027f31a 2017-11-04 stsp 	symref->name = symref_name;
 59 4027f31a 2017-11-04 stsp 	symref->ref = symref_ref;
 60 4027f31a 2017-11-04 stsp 	return NULL;
 61 4027f31a 2017-11-04 stsp }
 62 4027f31a 2017-11-04 stsp 
 63 4027f31a 2017-11-04 stsp static const struct got_error *
 64 4027f31a 2017-11-04 stsp parse_ref_line(struct got_reference **ref, const char *name, const char *line)
 65 4027f31a 2017-11-04 stsp {
 66 4027f31a 2017-11-04 stsp 	uint8_t digest[SHA1_DIGEST_LENGTH];
 67 4027f31a 2017-11-04 stsp 	char *ref_name;
 68 4027f31a 2017-11-04 stsp 
 69 4027f31a 2017-11-04 stsp 	if (strncmp(line, "ref: ", 5) == 0) {
 70 4027f31a 2017-11-04 stsp 		line += 5;
 71 4027f31a 2017-11-04 stsp 		return parse_symref(ref, name, line);
 72 4027f31a 2017-11-04 stsp 	}
 73 4027f31a 2017-11-04 stsp 
 74 4027f31a 2017-11-04 stsp 	ref_name = strdup(name);
 75 4027f31a 2017-11-04 stsp 	if (ref_name == NULL)
 76 4027f31a 2017-11-04 stsp 		return got_error(GOT_ERR_NO_MEM);
 77 4027f31a 2017-11-04 stsp 
 78 d1cda826 2017-11-06 stsp 	if (!got_parse_sha1_digest(digest, line))
 79 4027f31a 2017-11-04 stsp 		return got_error(GOT_ERR_NOT_REF);
 80 4027f31a 2017-11-04 stsp 
 81 4027f31a 2017-11-04 stsp 	*ref = calloc(1, sizeof(**ref));
 82 4027f31a 2017-11-04 stsp 	(*ref)->ref.ref.name = ref_name;
 83 4027f31a 2017-11-04 stsp 	memcpy(&(*ref)->ref.ref.sha1, digest, SHA1_DIGEST_LENGTH);
 84 4027f31a 2017-11-04 stsp 	return NULL;
 85 4027f31a 2017-11-04 stsp }
 86 4027f31a 2017-11-04 stsp 
 87 4027f31a 2017-11-04 stsp static const struct got_error *
 88 4027f31a 2017-11-04 stsp parse_ref_file(struct got_reference **ref, const char *name,
 89 4027f31a 2017-11-04 stsp     const char *abspath)
 90 4027f31a 2017-11-04 stsp {
 91 4027f31a 2017-11-04 stsp 	const struct got_error *err = NULL;
 92 4027f31a 2017-11-04 stsp 	FILE *f = fopen(abspath, "rb");
 93 4027f31a 2017-11-04 stsp 	char *line;
 94 4027f31a 2017-11-04 stsp 	size_t len;
 95 4027f31a 2017-11-04 stsp 	const char delim[3] = {'\0', '\0', '\0'};
 96 4027f31a 2017-11-04 stsp 
 97 4027f31a 2017-11-04 stsp 	if (f == NULL)
 98 4027f31a 2017-11-04 stsp 		return got_error(GOT_ERR_NOT_REF);
 99 4027f31a 2017-11-04 stsp 
100 4027f31a 2017-11-04 stsp 	line = fparseln(f, &len, NULL, delim, 0);
101 4027f31a 2017-11-04 stsp 	if (line == NULL) {
102 4027f31a 2017-11-04 stsp 		err = got_error(GOT_ERR_NOT_REF);
103 4027f31a 2017-11-04 stsp 		goto done;
104 4027f31a 2017-11-04 stsp 	}
105 4027f31a 2017-11-04 stsp 
106 4027f31a 2017-11-04 stsp 	err = parse_ref_line(ref, name, line);
107 4027f31a 2017-11-04 stsp done:
108 4027f31a 2017-11-04 stsp 	free(line);
109 4027f31a 2017-11-04 stsp 	fclose(f);
110 4027f31a 2017-11-04 stsp 	return err;
111 4027f31a 2017-11-04 stsp }
112 4027f31a 2017-11-04 stsp 
113 11995603 2017-11-05 stsp static char *
114 11995603 2017-11-05 stsp get_refs_dir_path(struct got_repository *repo, const char *refname)
115 11995603 2017-11-05 stsp {
116 11995603 2017-11-05 stsp 	if (strcmp(refname, GOT_REF_HEAD) == 0 ||
117 11995603 2017-11-05 stsp 	    strcmp(refname, GOT_REF_ORIG_HEAD) == 0 ||
118 11995603 2017-11-05 stsp 	    strcmp(refname, GOT_REF_MERGE_HEAD) == 0 ||
119 d4a5a885 2017-11-05 stsp 	    strcmp(refname, GOT_REF_FETCH_HEAD) == 0 ||
120 d4a5a885 2017-11-05 stsp 	    strncmp(refname, "refs/", 5) == 0)
121 11995603 2017-11-05 stsp 		return got_repo_get_path_git_dir(repo);
122 11995603 2017-11-05 stsp 
123 11995603 2017-11-05 stsp 	return got_repo_get_path_refs(repo);
124 11995603 2017-11-05 stsp }
125 11995603 2017-11-05 stsp 
126 4027f31a 2017-11-04 stsp const struct got_error *
127 11995603 2017-11-05 stsp got_ref_open(struct got_reference **ref, struct got_repository *repo,
128 4027f31a 2017-11-04 stsp    const char *refname)
129 4027f31a 2017-11-04 stsp {
130 4027f31a 2017-11-04 stsp 	const struct got_error *err = NULL;
131 4027f31a 2017-11-04 stsp 	char *path_ref = NULL;
132 4027f31a 2017-11-04 stsp 	char *normpath = NULL;
133 4027f31a 2017-11-04 stsp 	const char *parent_dir;
134 11995603 2017-11-05 stsp 	char *path_refs = get_refs_dir_path(repo, refname);
135 11995603 2017-11-05 stsp 
136 11995603 2017-11-05 stsp 	if (path_refs == NULL) {
137 11995603 2017-11-05 stsp 		err = got_error(GOT_ERR_NO_MEM);
138 11995603 2017-11-05 stsp 		goto done;
139 11995603 2017-11-05 stsp 	}
140 4027f31a 2017-11-04 stsp 	
141 4027f31a 2017-11-04 stsp 	/* XXX For now, this assumes that refs exist in the filesystem. */
142 4027f31a 2017-11-04 stsp 
143 4027f31a 2017-11-04 stsp 	if (asprintf(&path_ref, "%s/%s", path_refs, refname) == -1) {
144 4027f31a 2017-11-04 stsp 		err = got_error(GOT_ERR_NO_MEM);
145 4027f31a 2017-11-04 stsp 		goto done;
146 4027f31a 2017-11-04 stsp 	}
147 4027f31a 2017-11-04 stsp 
148 4027f31a 2017-11-04 stsp 	normpath = got_path_normalize(path_ref);
149 4027f31a 2017-11-04 stsp 	if (normpath == NULL) {
150 4027f31a 2017-11-04 stsp 		err = got_error(GOT_ERR_NOT_REF);
151 4027f31a 2017-11-04 stsp 		goto done;
152 4027f31a 2017-11-04 stsp 	}
153 4027f31a 2017-11-04 stsp 
154 11995603 2017-11-05 stsp 	err = parse_ref_file(ref, refname, normpath);
155 4027f31a 2017-11-04 stsp done:
156 4027f31a 2017-11-04 stsp 	free(normpath);
157 4027f31a 2017-11-04 stsp 	free(path_ref);
158 11995603 2017-11-05 stsp 	free(path_refs);
159 4027f31a 2017-11-04 stsp 	return err;
160 4027f31a 2017-11-04 stsp }
161 4027f31a 2017-11-04 stsp 
162 4027f31a 2017-11-04 stsp void
163 4027f31a 2017-11-04 stsp got_ref_close(struct got_reference *ref)
164 4027f31a 2017-11-04 stsp {
165 4027f31a 2017-11-04 stsp 	if (ref->flags & GOT_REF_IS_SYMBOLIC)
166 4027f31a 2017-11-04 stsp 		free(ref->ref.symref.name);
167 4027f31a 2017-11-04 stsp 	else
168 4027f31a 2017-11-04 stsp 		free(ref->ref.ref.name);
169 4027f31a 2017-11-04 stsp 	free(ref);
170 4027f31a 2017-11-04 stsp }
171 11995603 2017-11-05 stsp 
172 11995603 2017-11-05 stsp struct got_reference *
173 11995603 2017-11-05 stsp got_ref_dup(struct got_reference *ref)
174 11995603 2017-11-05 stsp {
175 11995603 2017-11-05 stsp 	struct got_reference *ret = calloc(1, sizeof(*ret));
176 11995603 2017-11-05 stsp 	char *name = NULL;
177 11995603 2017-11-05 stsp 	char *symref = NULL;
178 11995603 2017-11-05 stsp 
179 11995603 2017-11-05 stsp 	if (ret == NULL)
180 11995603 2017-11-05 stsp 		return NULL;
181 11995603 2017-11-05 stsp 
182 11995603 2017-11-05 stsp 	ret->flags = ref->flags;
183 11995603 2017-11-05 stsp 	if (ref->flags & GOT_REF_IS_SYMBOLIC) {
184 11995603 2017-11-05 stsp 		ret->ref.symref.name = strdup(ref->ref.symref.name);
185 11995603 2017-11-05 stsp 		if (ret->ref.symref.name == NULL) {
186 11995603 2017-11-05 stsp 			free(ret);
187 11995603 2017-11-05 stsp 			return NULL;
188 11995603 2017-11-05 stsp 		}
189 11995603 2017-11-05 stsp 		ret->ref.symref.ref = strdup(ref->ref.symref.ref);
190 11995603 2017-11-05 stsp 		if (ret->ref.symref.ref == NULL) {
191 11995603 2017-11-05 stsp 			free(ret->ref.symref.name);
192 11995603 2017-11-05 stsp 			free(ret);
193 11995603 2017-11-05 stsp 			return NULL;
194 11995603 2017-11-05 stsp 		}
195 11995603 2017-11-05 stsp 	} else {
196 11995603 2017-11-05 stsp 		ref->ref.ref.name = strdup(ref->ref.ref.name);
197 11995603 2017-11-05 stsp 		if (ref->ref.ref.name == NULL) {
198 11995603 2017-11-05 stsp 			free(ret);
199 11995603 2017-11-05 stsp 			return NULL;
200 11995603 2017-11-05 stsp 		}
201 11995603 2017-11-05 stsp 		memcpy(ret->ref.ref.sha1, ref->ref.ref.sha1,
202 11995603 2017-11-05 stsp 		    SHA1_DIGEST_LENGTH);
203 11995603 2017-11-05 stsp 	}
204 11995603 2017-11-05 stsp 
205 11995603 2017-11-05 stsp 	return ret;
206 11995603 2017-11-05 stsp }
207 11995603 2017-11-05 stsp 
208 11995603 2017-11-05 stsp static const struct got_error *
209 11995603 2017-11-05 stsp resolve_symbolic_ref(struct got_reference **resolved,
210 11995603 2017-11-05 stsp     struct got_repository *repo, struct got_reference *ref)
211 11995603 2017-11-05 stsp {
212 11995603 2017-11-05 stsp 	struct got_reference *nextref;
213 11995603 2017-11-05 stsp 	const struct got_error *err;
214 11995603 2017-11-05 stsp 
215 11995603 2017-11-05 stsp 	err = got_ref_open(&nextref, repo, ref->ref.symref.ref);
216 11995603 2017-11-05 stsp 	if (err)
217 11995603 2017-11-05 stsp 		return err;
218 11995603 2017-11-05 stsp 
219 11995603 2017-11-05 stsp 	if (nextref->flags & GOT_REF_IS_SYMBOLIC)
220 11995603 2017-11-05 stsp 		err = resolve_symbolic_ref(resolved, repo, nextref);
221 11995603 2017-11-05 stsp 	else
222 11995603 2017-11-05 stsp 		*resolved = got_ref_dup(nextref);
223 11995603 2017-11-05 stsp 
224 11995603 2017-11-05 stsp 	got_ref_close(nextref);
225 11995603 2017-11-05 stsp 	return err;
226 11995603 2017-11-05 stsp }
227 11995603 2017-11-05 stsp 
228 11995603 2017-11-05 stsp const struct got_error *
229 11995603 2017-11-05 stsp got_ref_resolve(struct got_object_id **id, struct got_repository *repo,
230 11995603 2017-11-05 stsp     struct got_reference *ref)
231 11995603 2017-11-05 stsp {
232 11995603 2017-11-05 stsp 	const struct got_error *err;
233 11995603 2017-11-05 stsp 
234 11995603 2017-11-05 stsp 	if (ref->flags & GOT_REF_IS_SYMBOLIC) {
235 11995603 2017-11-05 stsp 		struct got_reference *resolved = NULL;
236 11995603 2017-11-05 stsp 		err = resolve_symbolic_ref(&resolved, repo, ref);
237 11995603 2017-11-05 stsp 		if (err == NULL)
238 11995603 2017-11-05 stsp 			err = got_ref_resolve(id, repo, resolved);
239 11995603 2017-11-05 stsp 		free(resolved);
240 11995603 2017-11-05 stsp 		return err;
241 11995603 2017-11-05 stsp 	}
242 11995603 2017-11-05 stsp 
243 11995603 2017-11-05 stsp 	*id = calloc(1, sizeof(**id));
244 11995603 2017-11-05 stsp 	if (*id == NULL)
245 11995603 2017-11-05 stsp 		return got_error(GOT_ERR_NO_MEM);
246 11995603 2017-11-05 stsp 	memcpy((*id)->sha1, ref->ref.ref.sha1, SHA1_DIGEST_LENGTH);
247 11995603 2017-11-05 stsp 	return NULL;
248 11995603 2017-11-05 stsp }