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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 | ||
d8a1deec JH |
98 | if (!strncmp(name, "refs/", 5) && check_ref_format(name + 5)) |
99 | return error("refusing to create funny ref '%s' locally", | |
100 | name); | |
101 | ||
2eca23da LT |
102 | namelen = strlen(name); |
103 | lock_name = xmalloc(namelen + 10); | |
104 | memcpy(lock_name, name, namelen); | |
105 | memcpy(lock_name + namelen, ".lock", 6); | |
106 | ||
107 | strcpy(new_hex, sha1_to_hex(new_sha1)); | |
2eca23da LT |
108 | old_hex = sha1_to_hex(old_sha1); |
109 | if (!has_sha1_file(new_sha1)) | |
19614330 JH |
110 | return error("unpack should have generated %s, " |
111 | "but I can't find it!", new_hex); | |
2eca23da | 112 | |
29f3b3de JH |
113 | safe_create_leading_directories(lock_name); |
114 | ||
f312de01 | 115 | newfd = open(lock_name, O_CREAT | O_EXCL | O_WRONLY, 0666); |
2eca23da | 116 | if (newfd < 0) |
19614330 JH |
117 | return error("unable to create %s (%s)", |
118 | lock_name, strerror(errno)); | |
f65fdf04 LT |
119 | |
120 | /* Write the ref with an ending '\n' */ | |
121 | new_hex[40] = '\n'; | |
122 | new_hex[41] = 0; | |
2eca23da | 123 | written = write(newfd, new_hex, 41); |
f65fdf04 LT |
124 | /* Remove the '\n' again */ |
125 | new_hex[40] = 0; | |
126 | ||
2eca23da LT |
127 | close(newfd); |
128 | if (written != 41) { | |
129 | unlink(lock_name); | |
19614330 | 130 | return error("unable to write %s", lock_name); |
2eca23da LT |
131 | } |
132 | if (verify_old_ref(name, old_hex) < 0) { | |
133 | unlink(lock_name); | |
19614330 | 134 | return error("%s changed during push", name); |
2eca23da | 135 | } |
b1bf95bb JW |
136 | if (run_update_hook(name, old_hex, new_hex)) { |
137 | unlink(lock_name); | |
19614330 | 138 | return error("hook declined to update %s\n", name); |
b1bf95bb JW |
139 | } |
140 | else if (rename(lock_name, name) < 0) { | |
2eca23da | 141 | unlink(lock_name); |
19614330 | 142 | return error("unable to replace %s", name); |
2eca23da | 143 | } |
19614330 | 144 | else { |
b1bf95bb | 145 | fprintf(stderr, "%s: %s -> %s\n", name, old_hex, new_hex); |
19614330 JH |
146 | return 0; |
147 | } | |
2eca23da LT |
148 | } |
149 | ||
19614330 JH |
150 | static char update_post_hook[] = "hooks/post-update"; |
151 | ||
152 | static void run_update_post_hook(struct command *cmd) | |
153 | { | |
154 | struct command *cmd_p; | |
155 | int argc; | |
156 | char **argv; | |
157 | ||
158 | if (access(update_post_hook, X_OK) < 0) | |
159 | return; | |
160 | for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) { | |
161 | if (!cmd_p->updated) | |
162 | continue; | |
163 | argc++; | |
164 | } | |
165 | argv = xmalloc(sizeof(*argv) * (1 + argc)); | |
166 | argv[0] = update_post_hook; | |
167 | ||
168 | for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) { | |
169 | if (!cmd_p->updated) | |
170 | continue; | |
171 | argv[argc] = xmalloc(strlen(cmd_p->ref_name) + 1); | |
172 | strcpy(argv[argc], cmd_p->ref_name); | |
173 | argc++; | |
174 | } | |
175 | argv[argc] = NULL; | |
128aed68 | 176 | run_command_v_opt(argc, argv, RUN_COMMAND_NO_STDIO); |
19614330 | 177 | } |
2eca23da | 178 | |
575f4974 LT |
179 | /* |
180 | * This gets called after(if) we've successfully | |
181 | * unpacked the data payload. | |
182 | */ | |
183 | static void execute_commands(void) | |
184 | { | |
eb1af2df LT |
185 | struct command *cmd = commands; |
186 | ||
187 | while (cmd) { | |
19614330 JH |
188 | cmd->updated = !update(cmd->ref_name, |
189 | cmd->old_sha1, cmd->new_sha1); | |
eb1af2df | 190 | cmd = cmd->next; |
575f4974 | 191 | } |
19614330 | 192 | run_update_post_hook(commands); |
575f4974 LT |
193 | } |
194 | ||
195 | static void read_head_info(void) | |
196 | { | |
eb1af2df | 197 | struct command **p = &commands; |
575f4974 LT |
198 | for (;;) { |
199 | static char line[1000]; | |
eb1af2df LT |
200 | unsigned char old_sha1[20], new_sha1[20]; |
201 | struct command *cmd; | |
202 | int len; | |
203 | ||
204 | len = packet_read_line(0, line, sizeof(line)); | |
575f4974 LT |
205 | if (!len) |
206 | break; | |
eb1af2df LT |
207 | if (line[len-1] == '\n') |
208 | line[--len] = 0; | |
209 | if (len < 83 || | |
210 | line[40] != ' ' || | |
211 | line[81] != ' ' || | |
212 | get_sha1_hex(line, old_sha1) || | |
213 | get_sha1_hex(line + 41, new_sha1)) | |
214 | die("protocol error: expected old/new/ref, got '%s'", line); | |
215 | cmd = xmalloc(sizeof(struct command) + len - 80); | |
216 | memcpy(cmd->old_sha1, old_sha1, 20); | |
217 | memcpy(cmd->new_sha1, new_sha1, 20); | |
218 | memcpy(cmd->ref_name, line + 82, len - 81); | |
219 | cmd->next = NULL; | |
220 | *p = cmd; | |
221 | p = &cmd->next; | |
575f4974 LT |
222 | } |
223 | } | |
224 | ||
225 | static void unpack(void) | |
226 | { | |
b1bf95bb JW |
227 | int code = run_command(unpacker, NULL); |
228 | switch (code) { | |
229 | case 0: | |
c742b813 | 230 | return; |
b1bf95bb | 231 | case -ERR_RUN_COMMAND_FORK: |
575f4974 | 232 | die("unpack fork failed"); |
b1bf95bb | 233 | case -ERR_RUN_COMMAND_EXEC: |
575f4974 | 234 | die("unpack execute failed"); |
b1bf95bb JW |
235 | case -ERR_RUN_COMMAND_WAITPID: |
236 | die("waitpid failed"); | |
237 | case -ERR_RUN_COMMAND_WAITPID_WRONG_PID: | |
238 | die("waitpid is confused"); | |
239 | case -ERR_RUN_COMMAND_WAITPID_SIGNAL: | |
240 | die("%s died of signal", unpacker); | |
241 | case -ERR_RUN_COMMAND_WAITPID_NOEXIT: | |
242 | die("%s died strangely", unpacker); | |
243 | default: | |
244 | die("%s exited with error code %d", unpacker, -code); | |
575f4974 LT |
245 | } |
246 | } | |
247 | ||
248 | int main(int argc, char **argv) | |
249 | { | |
d0efc8a7 | 250 | int i; |
8d630132 | 251 | char *dir = NULL; |
575f4974 LT |
252 | |
253 | argv++; | |
254 | for (i = 1; i < argc; i++) { | |
8d630132 | 255 | char *arg = *argv++; |
575f4974 LT |
256 | |
257 | if (*arg == '-') { | |
575f4974 LT |
258 | /* Do flag handling here */ |
259 | usage(receive_pack_usage); | |
260 | } | |
d0efc8a7 LT |
261 | if (dir) |
262 | usage(receive_pack_usage); | |
575f4974 | 263 | dir = arg; |
575f4974 LT |
264 | } |
265 | if (!dir) | |
266 | usage(receive_pack_usage); | |
267 | ||
8d630132 AE |
268 | if(!enter_repo(dir, 0)) |
269 | die("'%s': unable to chdir or not a git archive", dir); | |
575f4974 | 270 | |
8a65ff76 | 271 | write_head_info(); |
575f4974 LT |
272 | |
273 | /* EOF */ | |
f3a3214e | 274 | packet_flush(1); |
575f4974 LT |
275 | |
276 | read_head_info(); | |
7f8e9828 LT |
277 | if (commands) { |
278 | unpack(); | |
279 | execute_commands(); | |
280 | } | |
575f4974 LT |
281 | return 0; |
282 | } |