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#include "cache.h"
#include "exec_cmd.h"
#include "pkt-line.h"
#include "sideband.h"
#include <sys/wait.h>
static pid_t setup_sideband(int sideband, const char *me, int fd[2], int xd[2])
{
pid_t side_pid;
if (!sideband) {
fd[0] = xd[0];
fd[1] = xd[1];
return 0;
}
/* xd[] is talking with upload-pack; subprocess reads from
* xd[0], spits out band#2 to stderr, and feeds us band#1
* through our fd[0].
*/
if (pipe(fd) < 0)
die("%s: unable to set up pipe", me);
side_pid = fork();
if (side_pid < 0)
die("%s: unable to fork off sideband demultiplexer", me);
if (!side_pid) {
/* subprocess */
close(fd[0]);
if (xd[0] != xd[1])
close(xd[1]);
if (recv_sideband(me, xd[0], fd[1], 2))
exit(1);
exit(0);
}
close(xd[0]);
close(fd[1]);
fd[1] = xd[1];
return side_pid;
}
static int get_pack(int xd[2], const char *me, int sideband, const char **argv)
{
int status;
pid_t pid, side_pid;
int fd[2];
side_pid = setup_sideband(sideband, me, fd, xd);
pid = fork();
if (pid < 0)
die("%s: unable to fork off git-unpack-objects", me);
if (!pid) {
dup2(fd[0], 0);
close(fd[0]);
close(fd[1]);
execv_git_cmd(argv);
die("%s exec failed", argv[0]);
}
close(fd[0]);
close(fd[1]);
while (waitpid(pid, &status, 0) < 0) {
if (errno != EINTR)
die("waiting for %s: %s", argv[0], strerror(errno));
}
if (WIFEXITED(status)) {
int code = WEXITSTATUS(status);
if (code)
die("%s died with error code %d", argv[0], code);
return 0;
}
if (WIFSIGNALED(status)) {
int sig = WTERMSIG(status);
die("%s died of signal %d", argv[0], sig);
}
die("%s died of unnatural causes %d", argv[0], status);
}
int receive_unpack_pack(int xd[2], const char *me, int quiet, int sideband)
{
const char *argv[3] = { "unpack-objects", quiet ? "-q" : NULL, NULL };
return get_pack(xd, me, sideband, argv);
}
int receive_keep_pack(int xd[2], const char *me, int quiet, int sideband)
{
const char *argv[5] = { "index-pack", "--stdin", "--fix-thin",
quiet ? NULL : "-v", NULL };
return get_pack(xd, me, sideband, argv);
}
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