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
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
|
/*
* Copyright (c) 2006 Franck Bui-Huu
*/
#include "cache.h"
#include "builtin.h"
#include "archive.h"
#include "pkt-line.h"
#include "sideband.h"
static const char upload_archive_usage[] =
"git upload-archive <repo>";
static const char deadchild[] =
"git upload-archive: archiver died with error";
static const char lostchild[] =
"git upload-archive: archiver process was lost";
#define MAX_ARGS (64)
static int run_upload_archive(int argc, const char **argv, const char *prefix)
{
const char *sent_argv[MAX_ARGS];
const char *arg_cmd = "argument ";
char *p, buf[4096];
int sent_argc;
int len;
if (argc != 2)
usage(upload_archive_usage);
if (strlen(argv[1]) + 1 > sizeof(buf))
die("insanely long repository name");
strcpy(buf, argv[1]); /* enter-repo smudges its argument */
if (!enter_repo(buf, 0))
die("not a git archive");
/* put received options in sent_argv[] */
sent_argc = 1;
sent_argv[0] = "git-upload-archive";
for (p = buf;;) {
/* This will die if not enough free space in buf */
len = packet_read_line(0, p, (buf + sizeof buf) - p);
if (len == 0)
break; /* got a flush */
if (sent_argc > MAX_ARGS - 2)
die("Too many options (>%d)", MAX_ARGS - 2);
if (p[len-1] == '\n') {
p[--len] = 0;
}
if (len < strlen(arg_cmd) ||
strncmp(arg_cmd, p, strlen(arg_cmd)))
die("'argument' token or flush expected");
len -= strlen(arg_cmd);
memmove(p, p + strlen(arg_cmd), len);
sent_argv[sent_argc++] = p;
p += len;
*p++ = 0;
}
sent_argv[sent_argc] = NULL;
/* parse all options sent by the client */
return write_archive(sent_argc, sent_argv, prefix, 0);
}
static void error_clnt(const char *fmt, ...)
{
char buf[1024];
va_list params;
int len;
va_start(params, fmt);
len = vsprintf(buf, fmt, params);
va_end(params);
send_sideband(1, 3, buf, len, LARGE_PACKET_MAX);
die("sent error to the client: %s", 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)
{
pid_t writer;
int fd1[2], fd2[2];
/*
* 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.
*/
if (pipe(fd1) < 0 || pipe(fd2) < 0) {
int err = errno;
packet_write(1, "NACK pipe failed on the remote side\n");
die("upload-archive: %s", strerror(err));
}
writer = fork();
if (writer < 0) {
int err = errno;
packet_write(1, "NACK fork failed on the remote side\n");
die("upload-archive: %s", strerror(err));
}
if (!writer) {
/* child - connect fd#1 and fd#2 to the pipe */
dup2(fd1[1], 1);
dup2(fd2[1], 2);
close(fd1[1]); close(fd2[1]);
close(fd1[0]); close(fd2[0]); /* we do not read from pipe */
exit(run_upload_archive(argc, argv, prefix));
}
/* parent - read from child, multiplex and send out to fd#1 */
close(fd1[1]); close(fd2[1]); /* we do not write to pipe */
packet_write(1, "ACK\n");
packet_flush(1);
while (1) {
struct pollfd pfd[2];
ssize_t processed[2] = { 0, 0 };
int status;
pfd[0].fd = fd1[0];
pfd[0].events = POLLIN;
pfd[1].fd = fd2[0];
pfd[1].events = POLLIN;
if (poll(pfd, 2, -1) < 0) {
if (errno != EINTR) {
error("poll failed resuming: %s",
strerror(errno));
sleep(1);
}
continue;
}
if (pfd[0].revents & POLLIN)
/* Data stream ready */
processed[0] = process_input(pfd[0].fd, 1);
if (pfd[1].revents & POLLIN)
/* Status stream ready */
processed[1] = process_input(pfd[1].fd, 2);
/* Always finish to read data when available */
if (processed[0] || processed[1])
continue;
if (waitpid(writer, &status, 0) < 0)
error_clnt("%s", lostchild);
else if (!WIFEXITED(status) || WEXITSTATUS(status) > 0)
error_clnt("%s", deadchild);
packet_flush(1);
break;
}
return 0;
}
|
