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tag: v1.7.0-rc1
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/*
* 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("'%s' does not appear to be a git repository", buf);

/* 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);
}

__attribute__((format (printf, 1, 2)))
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];
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[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 (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;
}
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