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1 | #include "cache.h" | |
2 | #include "refs.h" | |
3 | #include "pkt-line.h" | |
4 | #include "tag.h" | |
5 | #include "object.h" | |
6 | #include "commit.h" | |
7 | #include "exec_cmd.h" | |
8 | ||
9 | static const char upload_pack_usage[] = "git-upload-pack [--strict] [--timeout=nn] <dir>"; | |
10 | ||
11 | #define THEY_HAVE (1U << 0) | |
12 | #define OUR_REF (1U << 1) | |
13 | #define WANTED (1U << 2) | |
14 | #define MAX_HAS 256 | |
15 | #define MAX_NEEDS 256 | |
16 | static int nr_has = 0, nr_needs = 0, multi_ack = 0, nr_our_refs = 0; | |
17 | static int use_thin_pack = 0; | |
18 | static unsigned char has_sha1[MAX_HAS][20]; | |
19 | static unsigned char needs_sha1[MAX_NEEDS][20]; | |
20 | static unsigned int timeout = 0; | |
21 | ||
22 | static void reset_timeout(void) | |
23 | { | |
24 | alarm(timeout); | |
25 | } | |
26 | ||
27 | static int strip(char *line, int len) | |
28 | { | |
29 | if (len && line[len-1] == '\n') | |
30 | line[--len] = 0; | |
31 | return len; | |
32 | } | |
33 | ||
34 | static void create_pack_file(void) | |
35 | { | |
36 | int fd[2]; | |
37 | pid_t pid; | |
38 | int create_full_pack = (nr_our_refs == nr_needs && !nr_has); | |
39 | ||
40 | if (pipe(fd) < 0) | |
41 | die("git-upload-pack: unable to create pipe"); | |
42 | pid = fork(); | |
43 | if (pid < 0) | |
44 | die("git-upload-pack: unable to fork git-rev-list"); | |
45 | ||
46 | if (!pid) { | |
47 | int i; | |
48 | int args; | |
49 | const char **argv; | |
50 | char *buf; | |
51 | char **p; | |
52 | ||
53 | if (create_full_pack) { | |
54 | args = 10; | |
55 | use_thin_pack = 0; /* no point doing it */ | |
56 | } | |
57 | else | |
58 | args = nr_has + nr_needs + 5; | |
59 | p = xmalloc(args * sizeof(char *)); | |
60 | argv = (const char **) p; | |
61 | buf = xmalloc(args * 45); | |
62 | ||
63 | dup2(fd[1], 1); | |
64 | close(0); | |
65 | close(fd[0]); | |
66 | close(fd[1]); | |
67 | *p++ = "rev-list"; | |
68 | *p++ = use_thin_pack ? "--objects-edge" : "--objects"; | |
69 | if (create_full_pack || MAX_NEEDS <= nr_needs) | |
70 | *p++ = "--all"; | |
71 | else { | |
72 | for (i = 0; i < nr_needs; i++) { | |
73 | *p++ = buf; | |
74 | memcpy(buf, sha1_to_hex(needs_sha1[i]), 41); | |
75 | buf += 41; | |
76 | } | |
77 | } | |
78 | if (!create_full_pack) | |
79 | for (i = 0; i < nr_has; i++) { | |
80 | *p++ = buf; | |
81 | *buf++ = '^'; | |
82 | memcpy(buf, sha1_to_hex(has_sha1[i]), 41); | |
83 | buf += 41; | |
84 | } | |
85 | *p++ = NULL; | |
86 | execv_git_cmd(argv); | |
87 | die("git-upload-pack: unable to exec git-rev-list"); | |
88 | } | |
89 | dup2(fd[0], 0); | |
90 | close(fd[0]); | |
91 | close(fd[1]); | |
92 | execl_git_cmd("pack-objects", "--stdout", NULL); | |
93 | die("git-upload-pack: unable to exec git-pack-objects"); | |
94 | } | |
95 | ||
96 | static int got_sha1(char *hex, unsigned char *sha1) | |
97 | { | |
98 | if (get_sha1_hex(hex, sha1)) | |
99 | die("git-upload-pack: expected SHA1 object, got '%s'", hex); | |
100 | if (!has_sha1_file(sha1)) | |
101 | return 0; | |
102 | if (nr_has < MAX_HAS) { | |
103 | struct object *o = lookup_object(sha1); | |
104 | if (!(o && o->parsed)) | |
105 | o = parse_object(sha1); | |
106 | if (!o) | |
107 | die("oops (%s)", sha1_to_hex(sha1)); | |
108 | if (o->type == TYPE_COMMIT) { | |
109 | struct commit_list *parents; | |
110 | if (o->flags & THEY_HAVE) | |
111 | return 0; | |
112 | o->flags |= THEY_HAVE; | |
113 | for (parents = ((struct commit*)o)->parents; | |
114 | parents; | |
115 | parents = parents->next) | |
116 | parents->item->object.flags |= THEY_HAVE; | |
117 | } | |
118 | memcpy(has_sha1[nr_has++], sha1, 20); | |
119 | } | |
120 | return 1; | |
121 | } | |
122 | ||
123 | static int get_common_commits(void) | |
124 | { | |
125 | static char line[1000]; | |
126 | unsigned char sha1[20], last_sha1[20]; | |
127 | int len; | |
128 | ||
129 | track_object_refs = 0; | |
130 | save_commit_buffer = 0; | |
131 | ||
132 | for(;;) { | |
133 | len = packet_read_line(0, line, sizeof(line)); | |
134 | reset_timeout(); | |
135 | ||
136 | if (!len) { | |
137 | if (nr_has == 0 || multi_ack) | |
138 | packet_write(1, "NAK\n"); | |
139 | continue; | |
140 | } | |
141 | len = strip(line, len); | |
142 | if (!strncmp(line, "have ", 5)) { | |
143 | if (got_sha1(line+5, sha1) && | |
144 | (multi_ack || nr_has == 1)) { | |
145 | if (nr_has >= MAX_HAS) | |
146 | multi_ack = 0; | |
147 | packet_write(1, "ACK %s%s\n", | |
148 | sha1_to_hex(sha1), | |
149 | multi_ack ? " continue" : ""); | |
150 | if (multi_ack) | |
151 | memcpy(last_sha1, sha1, 20); | |
152 | } | |
153 | continue; | |
154 | } | |
155 | if (!strcmp(line, "done")) { | |
156 | if (nr_has > 0) { | |
157 | if (multi_ack) | |
158 | packet_write(1, "ACK %s\n", | |
159 | sha1_to_hex(last_sha1)); | |
160 | return 0; | |
161 | } | |
162 | packet_write(1, "NAK\n"); | |
163 | return -1; | |
164 | } | |
165 | die("git-upload-pack: expected SHA1 list, got '%s'", line); | |
166 | } | |
167 | } | |
168 | ||
169 | static int receive_needs(void) | |
170 | { | |
171 | static char line[1000]; | |
172 | int len, needs; | |
173 | ||
174 | needs = 0; | |
175 | for (;;) { | |
176 | struct object *o; | |
177 | unsigned char dummy[20], *sha1_buf; | |
178 | len = packet_read_line(0, line, sizeof(line)); | |
179 | reset_timeout(); | |
180 | if (!len) | |
181 | return needs; | |
182 | ||
183 | sha1_buf = dummy; | |
184 | if (needs == MAX_NEEDS) { | |
185 | fprintf(stderr, | |
186 | "warning: supporting only a max of %d requests. " | |
187 | "sending everything instead.\n", | |
188 | MAX_NEEDS); | |
189 | } | |
190 | else if (needs < MAX_NEEDS) | |
191 | sha1_buf = needs_sha1[needs]; | |
192 | ||
193 | if (strncmp("want ", line, 5) || get_sha1_hex(line+5, sha1_buf)) | |
194 | die("git-upload-pack: protocol error, " | |
195 | "expected to get sha, not '%s'", line); | |
196 | if (strstr(line+45, "multi_ack")) | |
197 | multi_ack = 1; | |
198 | if (strstr(line+45, "thin-pack")) | |
199 | use_thin_pack = 1; | |
200 | ||
201 | /* We have sent all our refs already, and the other end | |
202 | * should have chosen out of them; otherwise they are | |
203 | * asking for nonsense. | |
204 | * | |
205 | * Hmph. We may later want to allow "want" line that | |
206 | * asks for something like "master~10" (symbolic)... | |
207 | * would it make sense? I don't know. | |
208 | */ | |
209 | o = lookup_object(sha1_buf); | |
210 | if (!o || !(o->flags & OUR_REF)) | |
211 | die("git-upload-pack: not our ref %s", line+5); | |
212 | if (!(o->flags & WANTED)) { | |
213 | o->flags |= WANTED; | |
214 | needs++; | |
215 | } | |
216 | } | |
217 | } | |
218 | ||
219 | static int send_ref(const char *refname, const unsigned char *sha1) | |
220 | { | |
221 | static char *capabilities = "multi_ack thin-pack"; | |
222 | struct object *o = parse_object(sha1); | |
223 | ||
224 | if (!o) | |
225 | die("git-upload-pack: cannot find object %s:", sha1_to_hex(sha1)); | |
226 | ||
227 | if (capabilities) | |
228 | packet_write(1, "%s %s%c%s\n", sha1_to_hex(sha1), refname, | |
229 | 0, capabilities); | |
230 | else | |
231 | packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname); | |
232 | capabilities = NULL; | |
233 | if (!(o->flags & OUR_REF)) { | |
234 | o->flags |= OUR_REF; | |
235 | nr_our_refs++; | |
236 | } | |
237 | if (o->type == TYPE_TAG) { | |
238 | o = deref_tag(o, refname, 0); | |
239 | packet_write(1, "%s %s^{}\n", sha1_to_hex(o->sha1), refname); | |
240 | } | |
241 | return 0; | |
242 | } | |
243 | ||
244 | static int upload_pack(void) | |
245 | { | |
246 | reset_timeout(); | |
247 | head_ref(send_ref); | |
248 | for_each_ref(send_ref); | |
249 | packet_flush(1); | |
250 | nr_needs = receive_needs(); | |
251 | if (!nr_needs) | |
252 | return 0; | |
253 | get_common_commits(); | |
254 | create_pack_file(); | |
255 | return 0; | |
256 | } | |
257 | ||
258 | int main(int argc, char **argv) | |
259 | { | |
260 | char *dir; | |
261 | int i; | |
262 | int strict = 0; | |
263 | ||
264 | for (i = 1; i < argc; i++) { | |
265 | char *arg = argv[i]; | |
266 | ||
267 | if (arg[0] != '-') | |
268 | break; | |
269 | if (!strcmp(arg, "--strict")) { | |
270 | strict = 1; | |
271 | continue; | |
272 | } | |
273 | if (!strncmp(arg, "--timeout=", 10)) { | |
274 | timeout = atoi(arg+10); | |
275 | continue; | |
276 | } | |
277 | if (!strcmp(arg, "--")) { | |
278 | i++; | |
279 | break; | |
280 | } | |
281 | } | |
282 | ||
283 | if (i != argc-1) | |
284 | usage(upload_pack_usage); | |
285 | dir = argv[i]; | |
286 | ||
287 | if (!enter_repo(dir, strict)) | |
288 | die("'%s': unable to chdir or not a git archive", dir); | |
289 | ||
290 | upload_pack(); | |
291 | return 0; | |
292 | } |