No funny names on cygwin...
[git/git.git] / fetch-pack.c
CommitLineData
def88e9a 1#include "cache.h"
fb9040cc 2#include "refs.h"
def88e9a 3#include "pkt-line.h"
75bfc6c2 4#include <sys/wait.h>
def88e9a 5
8b3d9dc0 6static int quiet;
33b83034
JH
7static int verbose;
8static const char fetch_pack_usage[] =
9"git-fetch-pack [-q] [-v] [--exec=upload-pack] [host:]directory <refs>...";
def88e9a
LT
10static const char *exec = "git-upload-pack";
11
33b83034
JH
12static int find_common(int fd[2], unsigned char *result_sha1,
13 struct ref *refs)
def88e9a
LT
14{
15 static char line[1000];
75bfc6c2
LT
16 int count = 0, flushes = 0, retval;
17 FILE *revs;
def88e9a 18
75bfc6c2
LT
19 revs = popen("git-rev-list $(git-rev-parse --all)", "r");
20 if (!revs)
21 die("unable to run 'git-rev-list'");
33b83034
JH
22
23 while (refs) {
24 unsigned char *remote = refs->old_sha1;
25 if (verbose)
26 fprintf(stderr,
27 "want %s (%s)\n", sha1_to_hex(remote),
28 refs->name);
29 packet_write(fd[1], "want %s\n", sha1_to_hex(remote));
30 refs = refs->next;
31 }
fb9040cc 32 packet_flush(fd[1]);
75bfc6c2
LT
33 flushes = 1;
34 retval = -1;
35 while (fgets(line, sizeof(line), revs) != NULL) {
def88e9a
LT
36 unsigned char sha1[20];
37 if (get_sha1_hex(line, sha1))
38 die("git-fetch-pack: expected object name, got crud");
39 packet_write(fd[1], "have %s\n", sha1_to_hex(sha1));
33b83034
JH
40 if (verbose)
41 fprintf(stderr, "have %s\n", sha1_to_hex(sha1));
def88e9a
LT
42 if (!(31 & ++count)) {
43 packet_flush(fd[1]);
44 flushes++;
45
46 /*
47 * We keep one window "ahead" of the other side, and
48 * will wait for an ACK only on the next one
49 */
50 if (count == 32)
51 continue;
75bfc6c2
LT
52 if (get_ack(fd[0], result_sha1)) {
53 flushes = 0;
54 retval = 0;
33b83034
JH
55 if (verbose)
56 fprintf(stderr, "got ack\n");
75bfc6c2
LT
57 break;
58 }
def88e9a
LT
59 flushes--;
60 }
61 }
75bfc6c2
LT
62 pclose(revs);
63 packet_write(fd[1], "done\n");
33b83034
JH
64 if (verbose)
65 fprintf(stderr, "done\n");
def88e9a
LT
66 while (flushes) {
67 flushes--;
33b83034
JH
68 if (get_ack(fd[0], result_sha1)) {
69 if (verbose)
70 fprintf(stderr, "got ack\n");
def88e9a 71 return 0;
33b83034 72 }
def88e9a 73 }
75bfc6c2 74 return retval;
def88e9a
LT
75}
76
def88e9a
LT
77static int fetch_pack(int fd[2], int nr_match, char **match)
78{
d1c133f5
LT
79 struct ref *ref;
80 unsigned char sha1[20];
81 int status;
75bfc6c2 82 pid_t pid;
def88e9a 83
1a7141ff 84 get_remote_heads(fd[0], &ref, nr_match, match, 1);
d1c133f5
LT
85 if (!ref) {
86 packet_flush(fd[1]);
87 die("no matching remote head");
88 }
33b83034
JH
89 if (find_common(fd, sha1, ref) < 0)
90 fprintf(stderr, "warning: no common commits\n");
75bfc6c2
LT
91 pid = fork();
92 if (pid < 0)
93 die("git-fetch-pack: unable to fork off git-unpack-objects");
94 if (!pid) {
75bfc6c2
LT
95 dup2(fd[0], 0);
96 close(fd[0]);
85c414b5 97 close(fd[1]);
8b3d9dc0
JH
98 execlp("git-unpack-objects", "git-unpack-objects",
99 quiet ? "-q" : NULL, NULL);
75bfc6c2
LT
100 die("git-unpack-objects exec failed");
101 }
fb9040cc 102 close(fd[0]);
75bfc6c2
LT
103 close(fd[1]);
104 while (waitpid(pid, &status, 0) < 0) {
105 if (errno != EINTR)
106 die("waiting for git-unpack-objects: %s", strerror(errno));
107 }
108 if (WIFEXITED(status)) {
109 int code = WEXITSTATUS(status);
110 if (code)
111 die("git-unpack-objects died with error code %d", code);
33b83034
JH
112 while (ref) {
113 printf("%s %s\n",
114 sha1_to_hex(ref->old_sha1), ref->name);
115 ref = ref->next;
116 }
75bfc6c2
LT
117 return 0;
118 }
119 if (WIFSIGNALED(status)) {
120 int sig = WTERMSIG(status);
121 die("git-unpack-objects died of signal %d", sig);
122 }
123 die("Sherlock Holmes! git-unpack-objects died of unnatural causes %d!", status);
def88e9a
LT
124}
125
126int main(int argc, char **argv)
127{
128 int i, ret, nr_heads;
129 char *dest = NULL, **heads;
130 int fd[2];
131 pid_t pid;
132
133 nr_heads = 0;
134 heads = NULL;
135 for (i = 1; i < argc; i++) {
136 char *arg = argv[i];
137
138 if (*arg == '-') {
8b3d9dc0
JH
139 if (!strncmp("--exec=", arg, 7)) {
140 exec = arg + 7;
141 continue;
142 }
33b83034
JH
143 if (!strcmp("-q", arg)) {
144 quiet = 1;
145 continue;
146 }
147 if (!strcmp("-v", arg)) {
148 verbose = 1;
149 continue;
150 }
def88e9a
LT
151 usage(fetch_pack_usage);
152 }
153 dest = arg;
154 heads = argv + i + 1;
155 nr_heads = argc - i - 1;
156 break;
157 }
158 if (!dest)
159 usage(fetch_pack_usage);
160 pid = git_connect(fd, dest, exec);
161 if (pid < 0)
162 return 1;
163 ret = fetch_pack(fd, nr_heads, heads);
164 close(fd[0]);
165 close(fd[1]);
166 finish_connect(pid);
167 return ret;
168}