summaryrefslogtreecommitdiff
path: root/ssh-pull.c
blob: b7f313bf277fc2f2c2cfb84048cd077728da9dd9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
#include "cache.h"
#include "commit.h"
#include "rsh.h"
#include "pull.h"
#include "refs.h"
 
static int fd_in;
static int fd_out;
 
static unsigned char remote_version = 0;
static unsigned char local_version = 1;
 
static ssize_t force_write(int fd, void *buffer, size_t length)
{
	ssize_t ret = 0;
	while (ret < length) {
		ssize_t size = write(fd, buffer + ret, length - ret);
		if (size < 0) {
			return size;
		}
		if (size == 0) {
			return ret;
		}
		ret += size;
	}
	return ret;
}
 
void prefetch(unsigned char *sha1)
{
	char type = 'o';
	force_write(fd_out, &type, 1);
	force_write(fd_out, sha1, 20);
	//memcpy(requested + 20 * prefetches++, sha1, 20);
}
 
static char conn_buf[4096];
static size_t conn_buf_posn = 0;
 
int fetch(unsigned char *sha1)
{
	int ret;
	signed char remote;
 
	if (conn_buf_posn) {
		remote = conn_buf[0];
		memmove(conn_buf, conn_buf + 1, --conn_buf_posn);
	} else {
		if (read(fd_in, &remote, 1) < 1)
			return -1;
	}
	//fprintf(stderr, "Got %d\n", remote);
	if (remote < 0)
		return remote;
	ret = write_sha1_from_fd(sha1, fd_in, conn_buf, 4096, &conn_buf_posn);
	if (!ret)
		pull_say("got %s\n", sha1_to_hex(sha1));
	return ret;
}
 
static int get_version(void)
{
	char type = 'v';
	write(fd_out, &type, 1);
	write(fd_out, &local_version, 1);
	if (read(fd_in, &remote_version, 1) < 1) {
		return error("Couldn't read version from remote end");
	}
	return 0;
}
 
int fetch_ref(char *ref, unsigned char *sha1)
{
	signed char remote;
	char type = 'r';
	write(fd_out, &type, 1);
	write(fd_out, ref, strlen(ref) + 1);
	read(fd_in, &remote, 1);
	if (remote < 0)
		return remote;
	read(fd_in, sha1, 20);
	return 0;
}
 
int main(int argc, char **argv)
{
	char *commit_id;
	char *url;
	int arg = 1;
	const char *prog = getenv("GIT_SSH_PUSH") ? : "git-ssh-push";
 
	while (arg < argc && argv[arg][0] == '-') {
		if (argv[arg][1] == 't') {
			get_tree = 1;
		} else if (argv[arg][1] == 'c') {
			get_history = 1;
		} else if (argv[arg][1] == 'a') {
			get_all = 1;
			get_tree = 1;
			get_history = 1;
		} else if (argv[arg][1] == 'v') {
			get_verbosely = 1;
		} else if (argv[arg][1] == 'w') {
			write_ref = argv[arg + 1];
			arg++;
		}
		arg++;
	}
	if (argc < arg + 2) {
		usage("git-ssh-pull [-c] [-t] [-a] [-v] [-d] [--recover] [-w ref] commit-id url");
		return 1;
	}
	commit_id = argv[arg];
	url = argv[arg + 1];
 
	if (setup_connection(&fd_in, &fd_out, prog, url, arg, argv + 1))
		return 1;
 
	if (get_version())
		return 1;
 
	if (pull(commit_id))
		return 1;
 
	return 0;
}