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Commit | Line | Data |
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95fc7512 DB |
1 | #include "refs.h" |
2 | #include "cache.h" | |
3 | ||
4 | #include <errno.h> | |
5 | ||
99a0a6e0 | 6 | static int read_ref(const char *refname, unsigned char *sha1) |
8a65ff76 LT |
7 | { |
8 | int ret = -1; | |
99a0a6e0 | 9 | int fd = open(git_path(refname), O_RDONLY); |
8a65ff76 LT |
10 | |
11 | if (fd >= 0) { | |
12 | char buffer[60]; | |
13 | if (read(fd, buffer, sizeof(buffer)) >= 40) | |
14 | ret = get_sha1_hex(buffer, sha1); | |
15 | close(fd); | |
16 | } | |
17 | return ret; | |
18 | } | |
19 | ||
944d8589 | 20 | static int do_for_each_ref(const char *base, int (*fn)(const char *path, const unsigned char *sha1)) |
8a65ff76 LT |
21 | { |
22 | int retval = 0; | |
99a0a6e0 | 23 | DIR *dir = opendir(git_path(base)); |
8a65ff76 LT |
24 | |
25 | if (dir) { | |
26 | struct dirent *de; | |
27 | int baselen = strlen(base); | |
28 | char *path = xmalloc(baselen + 257); | |
6cada6a9 LT |
29 | |
30 | if (!strncmp(base, "./", 2)) { | |
31 | base += 2; | |
32 | baselen -= 2; | |
33 | } | |
8a65ff76 | 34 | memcpy(path, base, baselen); |
944d8589 LT |
35 | if (baselen && base[baselen-1] != '/') |
36 | path[baselen++] = '/'; | |
8a65ff76 LT |
37 | |
38 | while ((de = readdir(dir)) != NULL) { | |
39 | unsigned char sha1[20]; | |
40 | struct stat st; | |
41 | int namelen; | |
42 | ||
43 | if (de->d_name[0] == '.') | |
44 | continue; | |
45 | namelen = strlen(de->d_name); | |
46 | if (namelen > 255) | |
47 | continue; | |
48 | memcpy(path + baselen, de->d_name, namelen+1); | |
99a0a6e0 | 49 | if (lstat(git_path(path), &st) < 0) |
8a65ff76 LT |
50 | continue; |
51 | if (S_ISDIR(st.st_mode)) { | |
8a65ff76 LT |
52 | retval = do_for_each_ref(path, fn); |
53 | if (retval) | |
54 | break; | |
55 | continue; | |
56 | } | |
57 | if (read_ref(path, sha1) < 0) | |
58 | continue; | |
59 | if (!has_sha1_file(sha1)) | |
60 | continue; | |
61 | retval = fn(path, sha1); | |
62 | if (retval) | |
63 | break; | |
64 | } | |
65 | free(path); | |
66 | closedir(dir); | |
67 | } | |
68 | return retval; | |
69 | } | |
70 | ||
723c31fe LT |
71 | int head_ref(int (*fn)(const char *path, const unsigned char *sha1)) |
72 | { | |
73 | unsigned char sha1[20]; | |
99a0a6e0 LT |
74 | if (!read_ref("HEAD", sha1)) |
75 | return fn("HEAD", sha1); | |
2f34ba32 | 76 | return 0; |
723c31fe LT |
77 | } |
78 | ||
944d8589 | 79 | int for_each_ref(int (*fn)(const char *path, const unsigned char *sha1)) |
8a65ff76 | 80 | { |
99a0a6e0 | 81 | return do_for_each_ref("refs", fn); |
8a65ff76 LT |
82 | } |
83 | ||
95fc7512 DB |
84 | static char *ref_file_name(const char *ref) |
85 | { | |
86 | char *base = get_refs_directory(); | |
87 | int baselen = strlen(base); | |
88 | int reflen = strlen(ref); | |
89 | char *ret = xmalloc(baselen + 2 + reflen); | |
90 | sprintf(ret, "%s/%s", base, ref); | |
91 | return ret; | |
92 | } | |
93 | ||
94 | static char *ref_lock_file_name(const char *ref) | |
95 | { | |
96 | char *base = get_refs_directory(); | |
97 | int baselen = strlen(base); | |
98 | int reflen = strlen(ref); | |
99 | char *ret = xmalloc(baselen + 7 + reflen); | |
100 | sprintf(ret, "%s/%s.lock", base, ref); | |
101 | return ret; | |
102 | } | |
103 | ||
104 | static int read_ref_file(const char *filename, unsigned char *sha1) { | |
105 | int fd = open(filename, O_RDONLY); | |
106 | char hex[41]; | |
107 | if (fd < 0) { | |
108 | return error("Couldn't open %s\n", filename); | |
109 | } | |
110 | if ((read(fd, hex, 41) < 41) || | |
111 | (hex[40] != '\n') || | |
112 | get_sha1_hex(hex, sha1)) { | |
113 | error("Couldn't read a hash from %s\n", filename); | |
114 | close(fd); | |
115 | return -1; | |
116 | } | |
117 | close(fd); | |
118 | return 0; | |
119 | } | |
120 | ||
121 | int get_ref_sha1(const char *ref, unsigned char *sha1) | |
122 | { | |
123 | char *filename; | |
124 | int retval; | |
125 | if (check_ref_format(ref)) | |
126 | return -1; | |
127 | filename = ref_file_name(ref); | |
128 | retval = read_ref_file(filename, sha1); | |
129 | free(filename); | |
130 | return retval; | |
131 | } | |
132 | ||
133 | static int lock_ref_file(const char *filename, const char *lock_filename, | |
134 | const unsigned char *old_sha1) | |
135 | { | |
136 | int fd = open(lock_filename, O_WRONLY | O_CREAT | O_EXCL, 0666); | |
137 | unsigned char current_sha1[20]; | |
138 | int retval; | |
139 | if (fd < 0) { | |
140 | return error("Couldn't open lock file for %s: %s", | |
141 | filename, strerror(errno)); | |
142 | } | |
143 | retval = read_ref_file(filename, current_sha1); | |
144 | if (old_sha1) { | |
145 | if (retval) { | |
146 | close(fd); | |
147 | unlink(lock_filename); | |
148 | return error("Could not read the current value of %s", | |
149 | filename); | |
150 | } | |
151 | if (memcmp(current_sha1, old_sha1, 20)) { | |
152 | close(fd); | |
153 | unlink(lock_filename); | |
154 | error("The current value of %s is %s", | |
155 | filename, sha1_to_hex(current_sha1)); | |
156 | return error("Expected %s", | |
157 | sha1_to_hex(old_sha1)); | |
158 | } | |
159 | } else { | |
160 | if (!retval) { | |
161 | close(fd); | |
162 | unlink(lock_filename); | |
163 | return error("Unexpectedly found a value of %s for %s", | |
164 | sha1_to_hex(current_sha1), filename); | |
165 | } | |
166 | } | |
167 | return fd; | |
168 | } | |
169 | ||
170 | int lock_ref_sha1(const char *ref, const unsigned char *old_sha1) | |
171 | { | |
172 | char *filename; | |
173 | char *lock_filename; | |
174 | int retval; | |
175 | if (check_ref_format(ref)) | |
176 | return -1; | |
177 | filename = ref_file_name(ref); | |
178 | lock_filename = ref_lock_file_name(ref); | |
179 | retval = lock_ref_file(filename, lock_filename, old_sha1); | |
180 | free(filename); | |
181 | free(lock_filename); | |
182 | return retval; | |
183 | } | |
184 | ||
185 | static int write_ref_file(const char *filename, | |
186 | const char *lock_filename, int fd, | |
187 | const unsigned char *sha1) | |
188 | { | |
189 | char *hex = sha1_to_hex(sha1); | |
190 | char term = '\n'; | |
191 | if (write(fd, hex, 40) < 40 || | |
192 | write(fd, &term, 1) < 1) { | |
193 | error("Couldn't write %s\n", filename); | |
194 | close(fd); | |
195 | return -1; | |
196 | } | |
197 | close(fd); | |
198 | rename(lock_filename, filename); | |
199 | return 0; | |
200 | } | |
201 | ||
202 | int write_ref_sha1(const char *ref, int fd, const unsigned char *sha1) | |
203 | { | |
204 | char *filename; | |
205 | char *lock_filename; | |
206 | int retval; | |
207 | if (fd < 0) | |
208 | return -1; | |
209 | if (check_ref_format(ref)) | |
210 | return -1; | |
211 | filename = ref_file_name(ref); | |
212 | lock_filename = ref_lock_file_name(ref); | |
213 | retval = write_ref_file(filename, lock_filename, fd, sha1); | |
214 | free(filename); | |
215 | free(lock_filename); | |
216 | return retval; | |
217 | } | |
218 | ||
219 | int check_ref_format(const char *ref) | |
220 | { | |
221 | char *middle; | |
222 | if (ref[0] == '.' || ref[0] == '/') | |
223 | return -1; | |
224 | middle = strchr(ref, '/'); | |
225 | if (!middle || !middle[1]) | |
226 | return -1; | |
227 | if (strchr(middle + 1, '/')) | |
228 | return -1; | |
229 | return 0; | |
230 | } | |
231 | ||
232 | int write_ref_sha1_unlocked(const char *ref, const unsigned char *sha1) | |
233 | { | |
234 | char *filename; | |
235 | char *lock_filename; | |
236 | int fd; | |
237 | int retval; | |
238 | if (check_ref_format(ref)) | |
239 | return -1; | |
240 | filename = ref_file_name(ref); | |
241 | lock_filename = ref_lock_file_name(ref); | |
242 | fd = open(lock_filename, O_WRONLY | O_CREAT | O_EXCL, 0666); | |
243 | if (fd < 0) { | |
244 | error("Writing %s", lock_filename); | |
245 | perror("Open"); | |
246 | } | |
247 | retval = write_ref_file(filename, lock_filename, fd, sha1); | |
248 | free(filename); | |
249 | free(lock_filename); | |
250 | return retval; | |
251 | } |