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 4027f31a 2017-11-04 stsp #include <sha1.h>
 19 4027f31a 2017-11-04 stsp #include <stdio.h>
 20 4027f31a 2017-11-04 stsp #include <stdlib.h>
 21 4027f31a 2017-11-04 stsp #include <string.h>
 22 4027f31a 2017-11-04 stsp #include <util.h>
 23 4027f31a 2017-11-04 stsp 
 24 4027f31a 2017-11-04 stsp #include "got_error.h"
 25 4027f31a 2017-11-04 stsp #include "got_refs.h"
 26 4027f31a 2017-11-04 stsp 
 27 c3f94f68 2017-11-05 stsp #include "path.h"
 28 c3f94f68 2017-11-05 stsp 
 29 4027f31a 2017-11-04 stsp static const struct got_error *
 30 4027f31a 2017-11-04 stsp parse_symref(struct got_reference **ref, const char *name, const char *line)
 31 4027f31a 2017-11-04 stsp {
 32 4027f31a 2017-11-04 stsp 	struct got_symref *symref;
 33 4027f31a 2017-11-04 stsp 	char *symref_name;
 34 4027f31a 2017-11-04 stsp 	char *symref_ref;
 35 4027f31a 2017-11-04 stsp 
 36 4027f31a 2017-11-04 stsp 	if (line[0] == '\0')
 37 4027f31a 2017-11-04 stsp 		return got_error(GOT_ERR_NOT_REF);
 38 4027f31a 2017-11-04 stsp 
 39 4027f31a 2017-11-04 stsp 	symref_name = strdup(name);
 40 4027f31a 2017-11-04 stsp 	if (symref_name == NULL)
 41 4027f31a 2017-11-04 stsp 		return got_error(GOT_ERR_NO_MEM);
 42 4027f31a 2017-11-04 stsp 	symref_ref = strdup(line);
 43 4027f31a 2017-11-04 stsp 	if (symref_ref == NULL) {
 44 4027f31a 2017-11-04 stsp 		free(symref_name);
 45 4027f31a 2017-11-04 stsp 		return got_error(GOT_ERR_NO_MEM);
 46 4027f31a 2017-11-04 stsp 	}
 47 4027f31a 2017-11-04 stsp 
 48 4027f31a 2017-11-04 stsp 	*ref = calloc(1, sizeof(**ref));
 49 4027f31a 2017-11-04 stsp 	(*ref)->flags |= GOT_REF_IS_SYMBOLIC;
 50 4027f31a 2017-11-04 stsp 	symref = &((*ref)->ref.symref);
 51 4027f31a 2017-11-04 stsp 	symref->name = symref_name;
 52 4027f31a 2017-11-04 stsp 	symref->ref = symref_ref;
 53 4027f31a 2017-11-04 stsp 	return NULL;
 54 4027f31a 2017-11-04 stsp }
 55 4027f31a 2017-11-04 stsp 
 56 4027f31a 2017-11-04 stsp static int
 57 4027f31a 2017-11-04 stsp parse_sha1_digest(uint8_t *digest, const char *line)
 58 4027f31a 2017-11-04 stsp {
 59 4027f31a 2017-11-04 stsp 	uint8_t b;
 60 4027f31a 2017-11-04 stsp 	int i, n;
 61 4027f31a 2017-11-04 stsp 
 62 4027f31a 2017-11-04 stsp 	for (i = 0; i < SHA1_DIGEST_LENGTH; i++) {
 63 4027f31a 2017-11-04 stsp 		n = sscanf(line, "%hhx", &b);
 64 4027f31a 2017-11-04 stsp 		if (n == 1)
 65 4027f31a 2017-11-04 stsp 			digest[i] = b;
 66 4027f31a 2017-11-04 stsp 		else
 67 4027f31a 2017-11-04 stsp 			return 0;
 68 4027f31a 2017-11-04 stsp 	}
 69 4027f31a 2017-11-04 stsp 
 70 4027f31a 2017-11-04 stsp 	return 1;
 71 4027f31a 2017-11-04 stsp }
 72 4027f31a 2017-11-04 stsp 
 73 4027f31a 2017-11-04 stsp static const struct got_error *
 74 4027f31a 2017-11-04 stsp parse_ref_line(struct got_reference **ref, const char *name, const char *line)
 75 4027f31a 2017-11-04 stsp {
 76 4027f31a 2017-11-04 stsp 	uint8_t digest[SHA1_DIGEST_LENGTH];
 77 4027f31a 2017-11-04 stsp 	char *ref_name;
 78 4027f31a 2017-11-04 stsp 
 79 4027f31a 2017-11-04 stsp 	if (strncmp(line, "ref: ", 5) == 0) {
 80 4027f31a 2017-11-04 stsp 		line += 5;
 81 4027f31a 2017-11-04 stsp 		return parse_symref(ref, name, line);
 82 4027f31a 2017-11-04 stsp 	}
 83 4027f31a 2017-11-04 stsp 
 84 4027f31a 2017-11-04 stsp 	ref_name = strdup(name);
 85 4027f31a 2017-11-04 stsp 	if (ref_name == NULL)
 86 4027f31a 2017-11-04 stsp 		return got_error(GOT_ERR_NO_MEM);
 87 4027f31a 2017-11-04 stsp 
 88 4027f31a 2017-11-04 stsp 	if (!parse_sha1_digest(digest, line))
 89 4027f31a 2017-11-04 stsp 		return got_error(GOT_ERR_NOT_REF);
 90 4027f31a 2017-11-04 stsp 
 91 4027f31a 2017-11-04 stsp 	*ref = calloc(1, sizeof(**ref));
 92 4027f31a 2017-11-04 stsp 	(*ref)->ref.ref.name = ref_name;
 93 4027f31a 2017-11-04 stsp 	memcpy(&(*ref)->ref.ref.sha1, digest, SHA1_DIGEST_LENGTH);
 94 4027f31a 2017-11-04 stsp 	return NULL;
 95 4027f31a 2017-11-04 stsp }
 96 4027f31a 2017-11-04 stsp 
 97 4027f31a 2017-11-04 stsp static const struct got_error *
 98 4027f31a 2017-11-04 stsp parse_ref_file(struct got_reference **ref, const char *name,
 99 4027f31a 2017-11-04 stsp     const char *abspath)
100 4027f31a 2017-11-04 stsp {
101 4027f31a 2017-11-04 stsp 	const struct got_error *err = NULL;
102 4027f31a 2017-11-04 stsp 	FILE *f = fopen(abspath, "rb");
103 4027f31a 2017-11-04 stsp 	char *line;
104 4027f31a 2017-11-04 stsp 	size_t len;
105 4027f31a 2017-11-04 stsp 	const char delim[3] = {'\0', '\0', '\0'};
106 4027f31a 2017-11-04 stsp 
107 4027f31a 2017-11-04 stsp 	if (f == NULL)
108 4027f31a 2017-11-04 stsp 		return got_error(GOT_ERR_NOT_REF);
109 4027f31a 2017-11-04 stsp 
110 4027f31a 2017-11-04 stsp 	line = fparseln(f, &len, NULL, delim, 0);
111 4027f31a 2017-11-04 stsp 	if (line == NULL) {
112 4027f31a 2017-11-04 stsp 		err = got_error(GOT_ERR_NOT_REF);
113 4027f31a 2017-11-04 stsp 		goto done;
114 4027f31a 2017-11-04 stsp 	}
115 4027f31a 2017-11-04 stsp 
116 4027f31a 2017-11-04 stsp 	err = parse_ref_line(ref, name, line);
117 4027f31a 2017-11-04 stsp done:
118 4027f31a 2017-11-04 stsp 	free(line);
119 4027f31a 2017-11-04 stsp 	fclose(f);
120 4027f31a 2017-11-04 stsp 	return err;
121 4027f31a 2017-11-04 stsp }
122 4027f31a 2017-11-04 stsp 
123 4027f31a 2017-11-04 stsp const struct got_error *
124 4027f31a 2017-11-04 stsp got_ref_open(struct got_reference **ref, const char *path_refs,
125 4027f31a 2017-11-04 stsp    const char *refname)
126 4027f31a 2017-11-04 stsp {
127 4027f31a 2017-11-04 stsp 	const struct got_error *err = NULL;
128 4027f31a 2017-11-04 stsp 	char *path_ref = NULL;
129 4027f31a 2017-11-04 stsp 	char *normpath = NULL;
130 4027f31a 2017-11-04 stsp 	const char *parent_dir;
131 4027f31a 2017-11-04 stsp 	
132 4027f31a 2017-11-04 stsp 	/* XXX For now, this assumes that refs exist in the filesystem. */
133 4027f31a 2017-11-04 stsp 
134 4027f31a 2017-11-04 stsp 	if (asprintf(&path_ref, "%s/%s", path_refs, refname) == -1) {
135 4027f31a 2017-11-04 stsp 		err = got_error(GOT_ERR_NO_MEM);
136 4027f31a 2017-11-04 stsp 		goto done;
137 4027f31a 2017-11-04 stsp 	}
138 4027f31a 2017-11-04 stsp 
139 4027f31a 2017-11-04 stsp 	normpath = got_path_normalize(path_ref);
140 4027f31a 2017-11-04 stsp 	if (normpath == NULL) {
141 4027f31a 2017-11-04 stsp 		err = got_error(GOT_ERR_NOT_REF);
142 4027f31a 2017-11-04 stsp 		goto done;
143 4027f31a 2017-11-04 stsp 	}
144 4027f31a 2017-11-04 stsp 
145 4027f31a 2017-11-04 stsp 	err = parse_ref_file(ref, refname, normpath ? normpath : path_refs);
146 4027f31a 2017-11-04 stsp done:
147 4027f31a 2017-11-04 stsp 	free(normpath);
148 4027f31a 2017-11-04 stsp 	free(path_ref);
149 4027f31a 2017-11-04 stsp 	return err;
150 4027f31a 2017-11-04 stsp }
151 4027f31a 2017-11-04 stsp 
152 4027f31a 2017-11-04 stsp void
153 4027f31a 2017-11-04 stsp got_ref_close(struct got_reference *ref)
154 4027f31a 2017-11-04 stsp {
155 4027f31a 2017-11-04 stsp 	if (ref->flags & GOT_REF_IS_SYMBOLIC)
156 4027f31a 2017-11-04 stsp 		free(ref->ref.symref.name);
157 4027f31a 2017-11-04 stsp 	else
158 4027f31a 2017-11-04 stsp 		free(ref->ref.ref.name);
159 4027f31a 2017-11-04 stsp 	free(ref);
160 4027f31a 2017-11-04 stsp }