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Commit | Line | Data |
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575f4974 | 1 | #include "cache.h" |
8a65ff76 | 2 | #include "refs.h" |
f3a3214e | 3 | #include "pkt-line.h" |
b1bf95bb | 4 | #include "run-command.h" |
575f4974 LT |
5 | #include <sys/wait.h> |
6 | ||
d0efc8a7 | 7 | static const char receive_pack_usage[] = "git-receive-pack <git-dir>"; |
575f4974 | 8 | |
b1bf95bb | 9 | static const char unpacker[] = "git-unpack-objects"; |
575f4974 | 10 | |
944d8589 | 11 | static int show_ref(const char *path, const unsigned char *sha1) |
575f4974 | 12 | { |
f3a3214e | 13 | packet_write(1, "%s %s\n", sha1_to_hex(sha1), path); |
8a65ff76 | 14 | return 0; |
575f4974 LT |
15 | } |
16 | ||
8a65ff76 | 17 | static void write_head_info(void) |
575f4974 | 18 | { |
8a65ff76 | 19 | for_each_ref(show_ref); |
575f4974 LT |
20 | } |
21 | ||
eb1af2df LT |
22 | struct command { |
23 | struct command *next; | |
19614330 | 24 | unsigned char updated; |
eb1af2df LT |
25 | unsigned char old_sha1[20]; |
26 | unsigned char new_sha1[20]; | |
2c04662d | 27 | char ref_name[0]; |
575f4974 LT |
28 | }; |
29 | ||
6da4016a | 30 | static struct command *commands = NULL; |
575f4974 | 31 | |
f65fdf04 LT |
32 | static int is_all_zeroes(const char *hex) |
33 | { | |
34 | int i; | |
35 | for (i = 0; i < 40; i++) | |
36 | if (*hex++ != '0') | |
37 | return 0; | |
38 | return 1; | |
39 | } | |
40 | ||
2eca23da LT |
41 | static int verify_old_ref(const char *name, char *hex_contents) |
42 | { | |
43 | int fd, ret; | |
44 | char buffer[60]; | |
45 | ||
f65fdf04 LT |
46 | if (is_all_zeroes(hex_contents)) |
47 | return 0; | |
2eca23da LT |
48 | fd = open(name, O_RDONLY); |
49 | if (fd < 0) | |
50 | return -1; | |
51 | ret = read(fd, buffer, 40); | |
52 | close(fd); | |
53 | if (ret != 40) | |
54 | return -1; | |
55 | if (memcmp(buffer, hex_contents, 40)) | |
56 | return -1; | |
57 | return 0; | |
58 | } | |
59 | ||
b1bf95bb JW |
60 | static char update_hook[] = "hooks/update"; |
61 | ||
62 | static int run_update_hook(const char *refname, | |
63 | char *old_hex, char *new_hex) | |
64 | { | |
65 | int code; | |
66 | ||
67 | if (access(update_hook, X_OK) < 0) | |
68 | return 0; | |
69 | code = run_command(update_hook, refname, old_hex, new_hex, NULL); | |
70 | switch (code) { | |
71 | case 0: | |
72 | return 0; | |
73 | case -ERR_RUN_COMMAND_FORK: | |
74 | die("hook fork failed"); | |
75 | case -ERR_RUN_COMMAND_EXEC: | |
76 | die("hook execute failed"); | |
77 | case -ERR_RUN_COMMAND_WAITPID: | |
78 | die("waitpid failed"); | |
79 | case -ERR_RUN_COMMAND_WAITPID_WRONG_PID: | |
80 | die("waitpid is confused"); | |
81 | case -ERR_RUN_COMMAND_WAITPID_SIGNAL: | |
82 | fprintf(stderr, "%s died of signal", update_hook); | |
83 | return -1; | |
84 | case -ERR_RUN_COMMAND_WAITPID_NOEXIT: | |
85 | die("%s died strangely", update_hook); | |
86 | default: | |
87 | error("%s exited with error code %d", update_hook, -code); | |
88 | return -code; | |
89 | } | |
90 | } | |
91 | ||
19614330 JH |
92 | static int update(const char *name, |
93 | unsigned char *old_sha1, unsigned char *new_sha1) | |
2eca23da LT |
94 | { |
95 | char new_hex[60], *old_hex, *lock_name; | |
96 | int newfd, namelen, written; | |
97 | ||
98 | namelen = strlen(name); | |
99 | lock_name = xmalloc(namelen + 10); | |
100 | memcpy(lock_name, name, namelen); | |
101 | memcpy(lock_name + namelen, ".lock", 6); | |
102 | ||
103 | strcpy(new_hex, sha1_to_hex(new_sha1)); | |
2eca23da LT |
104 | old_hex = sha1_to_hex(old_sha1); |
105 | if (!has_sha1_file(new_sha1)) | |
19614330 JH |
106 | return error("unpack should have generated %s, " |
107 | "but I can't find it!", new_hex); | |
2eca23da | 108 | |
29f3b3de JH |
109 | safe_create_leading_directories(lock_name); |
110 | ||
f312de01 | 111 | newfd = open(lock_name, O_CREAT | O_EXCL | O_WRONLY, 0666); |
2eca23da | 112 | if (newfd < 0) |
19614330 JH |
113 | return error("unable to create %s (%s)", |
114 | lock_name, strerror(errno)); | |
f65fdf04 LT |
115 | |
116 | /* Write the ref with an ending '\n' */ | |
117 | new_hex[40] = '\n'; | |
118 | new_hex[41] = 0; | |
2eca23da | 119 | written = write(newfd, new_hex, 41); |
f65fdf04 LT |
120 | /* Remove the '\n' again */ |
121 | new_hex[40] = 0; | |
122 | ||
2eca23da LT |
123 | close(newfd); |
124 | if (written != 41) { | |
125 | unlink(lock_name); | |
19614330 | 126 | return error("unable to write %s", lock_name); |
2eca23da LT |
127 | } |
128 | if (verify_old_ref(name, old_hex) < 0) { | |
129 | unlink(lock_name); | |
19614330 | 130 | return error("%s changed during push", name); |
2eca23da | 131 | } |
b1bf95bb JW |
132 | if (run_update_hook(name, old_hex, new_hex)) { |
133 | unlink(lock_name); | |
19614330 | 134 | return error("hook declined to update %s\n", name); |
b1bf95bb JW |
135 | } |
136 | else if (rename(lock_name, name) < 0) { | |
2eca23da | 137 | unlink(lock_name); |
19614330 | 138 | return error("unable to replace %s", name); |
2eca23da | 139 | } |
19614330 | 140 | else { |
b1bf95bb | 141 | fprintf(stderr, "%s: %s -> %s\n", name, old_hex, new_hex); |
19614330 JH |
142 | return 0; |
143 | } | |
2eca23da LT |
144 | } |
145 | ||
19614330 JH |
146 | static char update_post_hook[] = "hooks/post-update"; |
147 | ||
148 | static void run_update_post_hook(struct command *cmd) | |
149 | { | |
150 | struct command *cmd_p; | |
151 | int argc; | |
152 | char **argv; | |
153 | ||
154 | if (access(update_post_hook, X_OK) < 0) | |
155 | return; | |
156 | for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) { | |
157 | if (!cmd_p->updated) | |
158 | continue; | |
159 | argc++; | |
160 | } | |
161 | argv = xmalloc(sizeof(*argv) * (1 + argc)); | |
162 | argv[0] = update_post_hook; | |
163 | ||
164 | for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) { | |
165 | if (!cmd_p->updated) | |
166 | continue; | |
167 | argv[argc] = xmalloc(strlen(cmd_p->ref_name) + 1); | |
168 | strcpy(argv[argc], cmd_p->ref_name); | |
169 | argc++; | |
170 | } | |
171 | argv[argc] = NULL; | |
172 | run_command_v(argc, argv); | |
173 | } | |
2eca23da | 174 | |
575f4974 LT |
175 | /* |
176 | * This gets called after(if) we've successfully | |
177 | * unpacked the data payload. | |
178 | */ | |
179 | static void execute_commands(void) | |
180 | { | |
eb1af2df LT |
181 | struct command *cmd = commands; |
182 | ||
183 | while (cmd) { | |
19614330 JH |
184 | cmd->updated = !update(cmd->ref_name, |
185 | cmd->old_sha1, cmd->new_sha1); | |
eb1af2df | 186 | cmd = cmd->next; |
575f4974 | 187 | } |
19614330 | 188 | run_update_post_hook(commands); |
575f4974 LT |
189 | } |
190 | ||
191 | static void read_head_info(void) | |
192 | { | |
eb1af2df | 193 | struct command **p = &commands; |
575f4974 LT |
194 | for (;;) { |
195 | static char line[1000]; | |
eb1af2df LT |
196 | unsigned char old_sha1[20], new_sha1[20]; |
197 | struct command *cmd; | |
198 | int len; | |
199 | ||
200 | len = packet_read_line(0, line, sizeof(line)); | |
575f4974 LT |
201 | if (!len) |
202 | break; | |
eb1af2df LT |
203 | if (line[len-1] == '\n') |
204 | line[--len] = 0; | |
205 | if (len < 83 || | |
206 | line[40] != ' ' || | |
207 | line[81] != ' ' || | |
208 | get_sha1_hex(line, old_sha1) || | |
209 | get_sha1_hex(line + 41, new_sha1)) | |
210 | die("protocol error: expected old/new/ref, got '%s'", line); | |
211 | cmd = xmalloc(sizeof(struct command) + len - 80); | |
212 | memcpy(cmd->old_sha1, old_sha1, 20); | |
213 | memcpy(cmd->new_sha1, new_sha1, 20); | |
214 | memcpy(cmd->ref_name, line + 82, len - 81); | |
215 | cmd->next = NULL; | |
216 | *p = cmd; | |
217 | p = &cmd->next; | |
575f4974 LT |
218 | } |
219 | } | |
220 | ||
221 | static void unpack(void) | |
222 | { | |
b1bf95bb JW |
223 | int code = run_command(unpacker, NULL); |
224 | switch (code) { | |
225 | case 0: | |
c742b813 | 226 | return; |
b1bf95bb | 227 | case -ERR_RUN_COMMAND_FORK: |
575f4974 | 228 | die("unpack fork failed"); |
b1bf95bb | 229 | case -ERR_RUN_COMMAND_EXEC: |
575f4974 | 230 | die("unpack execute failed"); |
b1bf95bb JW |
231 | case -ERR_RUN_COMMAND_WAITPID: |
232 | die("waitpid failed"); | |
233 | case -ERR_RUN_COMMAND_WAITPID_WRONG_PID: | |
234 | die("waitpid is confused"); | |
235 | case -ERR_RUN_COMMAND_WAITPID_SIGNAL: | |
236 | die("%s died of signal", unpacker); | |
237 | case -ERR_RUN_COMMAND_WAITPID_NOEXIT: | |
238 | die("%s died strangely", unpacker); | |
239 | default: | |
240 | die("%s exited with error code %d", unpacker, -code); | |
575f4974 LT |
241 | } |
242 | } | |
243 | ||
244 | int main(int argc, char **argv) | |
245 | { | |
d0efc8a7 | 246 | int i; |
575f4974 | 247 | const char *dir = NULL; |
575f4974 LT |
248 | |
249 | argv++; | |
250 | for (i = 1; i < argc; i++) { | |
251 | const char *arg = *argv++; | |
252 | ||
253 | if (*arg == '-') { | |
575f4974 LT |
254 | /* Do flag handling here */ |
255 | usage(receive_pack_usage); | |
256 | } | |
d0efc8a7 LT |
257 | if (dir) |
258 | usage(receive_pack_usage); | |
575f4974 | 259 | dir = arg; |
575f4974 LT |
260 | } |
261 | if (!dir) | |
262 | usage(receive_pack_usage); | |
263 | ||
264 | /* chdir to the directory. If that fails, try appending ".git" */ | |
265 | if (chdir(dir) < 0) { | |
113b9475 | 266 | if (chdir(mkpath("%s.git", dir)) < 0) |
575f4974 LT |
267 | die("unable to cd to %s", dir); |
268 | } | |
269 | ||
270 | /* If we have a ".git" directory, chdir to it */ | |
271 | chdir(".git"); | |
e72a7d45 | 272 | putenv("GIT_DIR=."); |
575f4974 LT |
273 | |
274 | if (access("objects", X_OK) < 0 || access("refs/heads", X_OK) < 0) | |
275 | die("%s doesn't appear to be a git directory", dir); | |
8a65ff76 | 276 | write_head_info(); |
575f4974 LT |
277 | |
278 | /* EOF */ | |
f3a3214e | 279 | packet_flush(1); |
575f4974 LT |
280 | |
281 | read_head_info(); | |
7f8e9828 LT |
282 | if (commands) { |
283 | unpack(); | |
284 | execute_commands(); | |
285 | } | |
575f4974 LT |
286 | return 0; |
287 | } |