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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;

}