git-upload-pack: Support sending multiple ACK messages
[git/git.git] / upload-pack.c
CommitLineData
def88e9a
LT
1#include "cache.h"
2#include "refs.h"
3#include "pkt-line.h"
f6b42a81
JH
4#include "tag.h"
5#include "object.h"
794f9fe7 6#include "commit.h"
def88e9a 7
960deccb 8static const char upload_pack_usage[] = "git-upload-pack [--strict] [--timeout=nn] <dir>";
def88e9a 9
794f9fe7 10#define THEY_HAVE (1U << 0)
6b32884a
JH
11#define MAX_HAS 256
12#define MAX_NEEDS 256
0f8fdc39 13static int nr_has = 0, nr_needs = 0, multi_ack = 0;
fb9040cc
LT
14static unsigned char has_sha1[MAX_HAS][20];
15static unsigned char needs_sha1[MAX_NEEDS][20];
960deccb
PA
16static unsigned int timeout = 0;
17
18static void reset_timeout(void)
19{
20 alarm(timeout);
21}
fb9040cc 22
75bfc6c2
LT
23static int strip(char *line, int len)
24{
25 if (len && line[len-1] == '\n')
26 line[--len] = 0;
27 return len;
28}
29
fb9040cc
LT
30static void create_pack_file(void)
31{
75bfc6c2
LT
32 int fd[2];
33 pid_t pid;
34
35 if (pipe(fd) < 0)
36 die("git-upload-pack: unable to create pipe");
37 pid = fork();
38 if (pid < 0)
39 die("git-upload-pack: unable to fork git-rev-list");
40
41 if (!pid) {
42 int i;
e091eb93
JH
43 int args;
44 char **argv;
45 char *buf;
46 char **p;
47
48 if (MAX_NEEDS <= nr_needs)
49 args = nr_has + 10;
50 else
51 args = nr_has + nr_needs + 5;
52 argv = xmalloc(args * sizeof(char *));
53 buf = xmalloc(args * 45);
54 p = argv;
75bfc6c2
LT
55
56 dup2(fd[1], 1);
57 close(0);
58 close(fd[0]);
59 close(fd[1]);
60 *p++ = "git-rev-list";
61 *p++ = "--objects";
e091eb93
JH
62 if (MAX_NEEDS <= nr_needs)
63 *p++ = "--all";
64 else {
65 for (i = 0; i < nr_needs; i++) {
66 *p++ = buf;
67 memcpy(buf, sha1_to_hex(needs_sha1[i]), 41);
68 buf += 41;
69 }
75bfc6c2
LT
70 }
71 for (i = 0; i < nr_has; i++) {
72 *p++ = buf;
73 *buf++ = '^';
74 memcpy(buf, sha1_to_hex(has_sha1[i]), 41);
75 buf += 41;
76 }
77 *p++ = NULL;
78 execvp("git-rev-list", argv);
79 die("git-upload-pack: unable to exec git-rev-list");
80 }
81 dup2(fd[0], 0);
82 close(fd[0]);
83 close(fd[1]);
84 execlp("git-pack-objects", "git-pack-objects", "--stdout", NULL);
85 die("git-upload-pack: unable to exec git-pack-objects");
fb9040cc
LT
86}
87
def88e9a
LT
88static int got_sha1(char *hex, unsigned char *sha1)
89{
90 if (get_sha1_hex(hex, sha1))
91 die("git-upload-pack: expected SHA1 object, got '%s'", hex);
fb9040cc
LT
92 if (!has_sha1_file(sha1))
93 return 0;
794f9fe7
JS
94 if (nr_has < MAX_HAS) {
95 struct object *o = lookup_object(sha1);
96 if (!o || (!o->parsed && !parse_object(sha1)))
97 die("oops (%s)", sha1_to_hex(sha1));
98 if (o->type == commit_type) {
99 struct commit_list *parents;
100 if (o->flags & THEY_HAVE)
101 return 0;
102 o->flags |= THEY_HAVE;
103 for (parents = ((struct commit*)o)->parents;
104 parents;
105 parents = parents->next)
106 parents->item->object.flags |= THEY_HAVE;
107 }
108 memcpy(has_sha1[nr_has++], sha1, 20);
fb9040cc
LT
109 }
110 return 1;
def88e9a
LT
111}
112
113static int get_common_commits(void)
114{
115 static char line[1000];
116 unsigned char sha1[20];
117 int len;
118
794f9fe7
JS
119 track_object_refs = 0;
120 save_commit_buffer = 0;
121
def88e9a
LT
122 for(;;) {
123 len = packet_read_line(0, line, sizeof(line));
960deccb 124 reset_timeout();
def88e9a
LT
125
126 if (!len) {
0f8fdc39
JS
127 if (multi_ack || nr_has == 0)
128 packet_write(1, "NAK\n");
def88e9a
LT
129 continue;
130 }
75bfc6c2 131 len = strip(line, len);
def88e9a 132 if (!strncmp(line, "have ", 5)) {
0f8fdc39
JS
133 if (got_sha1(line+5, sha1) &&
134 (multi_ack || nr_has == 1))
135 packet_write(1, "ACK %s%s\n",
136 sha1_to_hex(sha1),
137 multi_ack && nr_has < MAX_HAS ?
138 " continue" : "");
def88e9a
LT
139 continue;
140 }
141 if (!strcmp(line, "done")) {
0f8fdc39
JS
142 if (nr_has > 0)
143 return 0;
def88e9a
LT
144 packet_write(1, "NAK\n");
145 return -1;
146 }
147 die("git-upload-pack: expected SHA1 list, got '%s'", line);
148 }
def88e9a
LT
149}
150
fb9040cc
LT
151static int receive_needs(void)
152{
153 static char line[1000];
154 int len, needs;
155
156 needs = 0;
157 for (;;) {
e091eb93 158 unsigned char dummy[20], *sha1_buf;
fb9040cc 159 len = packet_read_line(0, line, sizeof(line));
960deccb 160 reset_timeout();
fb9040cc
LT
161 if (!len)
162 return needs;
163
e091eb93
JH
164 sha1_buf = dummy;
165 if (needs == MAX_NEEDS) {
166 fprintf(stderr,
167 "warning: supporting only a max of %d requests. "
168 "sending everything instead.\n",
169 MAX_NEEDS);
170 }
171 else if (needs < MAX_NEEDS)
172 sha1_buf = needs_sha1[needs];
173
174 if (strncmp("want ", line, 5) || get_sha1_hex(line+5, sha1_buf))
175 die("git-upload-pack: protocol error, "
176 "expected to get sha, not '%s'", line);
0f8fdc39
JS
177
178 if (strstr(line+45, "multi_ack"))
179 multi_ack = 1;
180
fb9040cc
LT
181 needs++;
182 }
183}
184
def88e9a
LT
185static int send_ref(const char *refname, const unsigned char *sha1)
186{
f6b42a81
JH
187 struct object *o = parse_object(sha1);
188
def88e9a 189 packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname);
f6b42a81
JH
190 if (o->type == tag_type) {
191 o = deref_tag(o);
192 packet_write(1, "%s %s^{}\n", sha1_to_hex(o->sha1), refname);
193 }
def88e9a
LT
194 return 0;
195}
196
197static int upload_pack(void)
198{
960deccb 199 reset_timeout();
723c31fe 200 head_ref(send_ref);
def88e9a
LT
201 for_each_ref(send_ref);
202 packet_flush(1);
fb9040cc
LT
203 nr_needs = receive_needs();
204 if (!nr_needs)
205 return 0;
def88e9a 206 get_common_commits();
fb9040cc 207 create_pack_file();
def88e9a
LT
208 return 0;
209}
210
211int main(int argc, char **argv)
212{
213 const char *dir;
960deccb
PA
214 int i;
215 int strict = 0;
216
217 for (i = 1; i < argc; i++) {
218 char *arg = argv[i];
219
220 if (arg[0] != '-')
221 break;
222 if (!strcmp(arg, "--strict")) {
223 strict = 1;
224 continue;
225 }
226 if (!strncmp(arg, "--timeout=", 10)) {
227 timeout = atoi(arg+10);
228 continue;
229 }
230 if (!strcmp(arg, "--")) {
231 i++;
232 break;
233 }
234 }
235
236 if (i != argc-1)
def88e9a 237 usage(upload_pack_usage);
960deccb 238 dir = argv[i];
113b9475
LT
239
240 /* chdir to the directory. If that fails, try appending ".git" */
241 if (chdir(dir) < 0) {
960deccb 242 if (strict || chdir(mkpath("%s.git", dir)) < 0)
113b9475
LT
243 die("git-upload-pack unable to chdir to %s", dir);
244 }
960deccb
PA
245 if (!strict)
246 chdir(".git");
247
def88e9a
LT
248 if (access("objects", X_OK) || access("refs", X_OK))
249 die("git-upload-pack: %s doesn't seem to be a git archive", dir);
960deccb 250
e72a7d45 251 putenv("GIT_DIR=.");
def88e9a
LT
252 upload_pack();
253 return 0;
254}