summaryrefslogtreecommitdiff
path: root/ssh-fetch.c
blob: 683a1e4a01f250043324ae49fe61cc33470ceb9c (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
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
#ifndef COUNTERPART_ENV_NAME
#define COUNTERPART_ENV_NAME "GIT_SSH_UPLOAD"
#endif
#ifndef COUNTERPART_PROGRAM_NAME
#define COUNTERPART_PROGRAM_NAME "git-ssh-upload"
#endif
#ifndef MY_PROGRAM_NAME
#define MY_PROGRAM_NAME "git-ssh-fetch"
#endif

#include "cache.h"
#include "commit.h"
#include "rsh.h"
#include "fetch.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;
}

static const char ssh_fetch_usage[] =
  MY_PROGRAM_NAME
  " [-c] [-t] [-a] [-v] [-d] [--recover] [-w ref] commit-id url";
int main(int argc, char **argv)
{
	char *commit_id;
	char *url;
	int arg = 1;
	const char *prog;

	prog = getenv("GIT_SSH_PUSH");
	if (!prog) prog = "git-ssh-upload";

	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(ssh_fetch_usage);
		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;
}