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daemon: send stderr of service programs to the syslog

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If git-daemon is run with --detach or --inetd, then stderr is explicitly
redirected to /dev/null. But notice that the service programs were spawned
via execl_git_cmd(), in particular, the stderr channel is inherited from
the daemon. This means that errors that the programs wrote to stderr (for
example, via die()), went to /dev/null.

This patch arranges that the daemon does not merely exec the service
program, but forks it and monitors stderr of the child; it writes the
errors that it produces to the daemons log via logerror().

A consequence is that the daemon process remains in memory for the full
duration of the service program, but this cannot be avoided.

Signed-off-by: Johannes Sixt <j6t@kdbg.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Johannes Sixt 2009-06-14 22:38:51 +02:00 committed by Junio C Hamano
parent 4f4fa9c228
commit 5d87dd4fca
1 changed files with 48 additions and 8 deletions
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56
daemon.c
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@ -1,6 +1,8 @@
#include "cache.h"
#include "pkt-line.h"
#include "exec_cmd.h"
#include "run-command.h"
#include "strbuf.h"
#include <syslog.h>
@ -343,28 +345,66 @@ static int run_service(char *dir, struct daemon_service *service)
return service->fn();
}
static void copy_to_log(int fd)
{
struct strbuf line = STRBUF_INIT;
FILE *fp;
fp = fdopen(fd, "r");
if (fp == NULL) {
logerror("fdopen of error channel failed");
close(fd);
return;
}
while (strbuf_getline(&line, fp, '\n') != EOF) {
logerror("%s", line.buf);
strbuf_setlen(&line, 0);
}
strbuf_release(&line);
fclose(fp);
}
static int run_service_command(const char **argv)
{
struct child_process cld;
memset(&cld, 0, sizeof(cld));
cld.argv = argv;
cld.git_cmd = 1;
cld.err = -1;
if (start_command(&cld))
return -1;
close(0);
close(1);
copy_to_log(cld.err);
return finish_command(&cld);
}
static int upload_pack(void)
{
/* Timeout as string */
char timeout_buf[64];
const char *argv[] = { "upload-pack", "--strict", timeout_buf, ".", NULL };
snprintf(timeout_buf, sizeof timeout_buf, "--timeout=%u", timeout);
/* git-upload-pack only ever reads stuff, so this is safe */
execl_git_cmd("upload-pack", "--strict", timeout_buf, ".", NULL);
return -1;
return run_service_command(argv);
}
static int upload_archive(void)
{
execl_git_cmd("upload-archive", ".", NULL);
return -1;
static const char *argv[] = { "upload-archive", ".", NULL };
return run_service_command(argv);
}
static int receive_pack(void)
{
execl_git_cmd("receive-pack", ".", NULL);
return -1;
static const char *argv[] = { "receive-pack", ".", NULL };
return run_service_command(argv);
}
static struct daemon_service daemon_service[] = {