about summary refs log tree commit diff
path: root/builtin/upload-archive.c
blob: 018879737aeedc245a1473247df16ed0dcd26e50 (plain) (blame)
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
/*
 * Copyright (c) 2006 Franck Bui-Huu
 */
#include "cache.h"
#include "builtin.h"
#include "archive.h"
#include "pkt-line.h"
#include "sideband.h"
#include "run-command.h"
#include "argv-array.h"

static const char upload_archive_usage[] =
	"git upload-archive <repo>";

static const char deadchild[] =
"git upload-archive: archiver died with error";

#define MAX_ARGS (64)

int cmd_upload_archive_writer(int argc, const char **argv, const char *prefix)
{
	struct argv_array sent_argv = ARGV_ARRAY_INIT;
	const char *arg_cmd = "argument ";

	if (argc != 2 || !strcmp(argv[1], "-h"))
		usage(upload_archive_usage);

	if (!enter_repo(argv[1], 0))
		die("'%s' does not appear to be a git repository", argv[1]);

	init_archivers();

	/* put received options in sent_argv[] */
	argv_array_push(&sent_argv, "git-upload-archive");
	for (;;) {
		char *buf = packet_read_line(0, NULL);
		if (!buf)
			break;	/* got a flush */
		if (sent_argv.argc > MAX_ARGS)
			die("Too many options (>%d)", MAX_ARGS - 1);

		if (!starts_with(buf, arg_cmd))
			die("'argument' token or flush expected");
		argv_array_push(&sent_argv, buf + strlen(arg_cmd));
	}

	/* parse all options sent by the client */
	return write_archive(sent_argv.argc, sent_argv.argv, prefix,
			     the_repository, NULL, 1);
}

__attribute__((format (printf, 1, 2)))
static void error_clnt(const char *fmt, ...)
{
	struct strbuf buf = STRBUF_INIT;
	va_list params;

	va_start(params, fmt);
	strbuf_vaddf(&buf, fmt, params);
	va_end(params);
	send_sideband(1, 3, buf.buf, buf.len, LARGE_PACKET_MAX);
	die("sent error to the client: %s", buf.buf);
}

static ssize_t process_input(int child_fd, int band)
{
	char buf[16384];
	ssize_t sz = read(child_fd, buf, sizeof(buf));
	if (sz < 0) {
		if (errno != EAGAIN && errno != EINTR)
			error_clnt("read error: %s\n", strerror(errno));
		return sz;
	}
	send_sideband(1, band, buf, sz, LARGE_PACKET_MAX);
	return sz;
}

int cmd_upload_archive(int argc, const char **argv, const char *prefix)
{
	struct child_process writer = { argv };

	if (argc == 2 && !strcmp(argv[1], "-h"))
		usage(upload_archive_usage);

	/*
	 * Set up sideband subprocess.
	 *
	 * We (parent) monitor and read from child, sending its fd#1 and fd#2
	 * multiplexed out to our fd#1.  If the child dies, we tell the other
	 * end over channel #3.
	 */
	argv[0] = "upload-archive--writer";
	writer.out = writer.err = -1;
	writer.git_cmd = 1;
	if (start_command(&writer)) {
		int err = errno;
		packet_write_fmt(1, "NACK unable to spawn subprocess\n");
		die("upload-archive: %s", strerror(err));
	}

	packet_write_fmt(1, "ACK\n");
	packet_flush(1);

	while (1) {
		struct pollfd pfd[2];

		pfd[0].fd = writer.out;
		pfd[0].events = POLLIN;
		pfd[1].fd = writer.err;
		pfd[1].events = POLLIN;
		if (poll(pfd, 2, -1) < 0) {
			if (errno != EINTR) {
				error_errno("poll failed resuming");
				sleep(1);
			}
			continue;
		}
		if (pfd[1].revents & POLLIN)
			/* Status stream ready */
			if (process_input(pfd[1].fd, 2))
				continue;
		if (pfd[0].revents & POLLIN)
			/* Data stream ready */
			if (process_input(pfd[0].fd, 1))
				continue;

		if (finish_command(&writer))
			error_clnt("%s", deadchild);
		packet_flush(1);
		break;
	}
	return 0;
}