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35a71f1402
The credential-cache helper will try to connect to its
daemon over a unix socket. Originally, a failure to do so
was silently ignored, and we would either give up (if
performing a "get" or "erase" operation), or spawn a new
daemon (for a "store" operation).
But since 8ec6c8d, we try to report more errors. We detect a
missing daemon by checking for ENOENT on our connection
attempt. If the daemon is missing, we continue as before
(giving up or spawning a new daemon). For any other error,
we die and report the problem.
However, checking for ENOENT is not sufficient for a missing
daemon. We might also get ECONNREFUSED if a dead daemon
process left a stale socket. This generally shouldn't
happen, as the daemon cleans up after itself, but the daemon
may not always be given a chance to do so (e.g., power loss,
"kill -9").
The resulting state is annoying not just because the helper
outputs an extra useless message, but because it actually
blocks the helper from spawning a new daemon to replace the
stale socket.
Fix it by checking for ECONNREFUSED.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
124 lines
2.9 KiB
C
124 lines
2.9 KiB
C
#include "cache.h"
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#include "credential.h"
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#include "string-list.h"
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#include "parse-options.h"
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#include "unix-socket.h"
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#include "run-command.h"
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#define FLAG_SPAWN 0x1
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#define FLAG_RELAY 0x2
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static int send_request(const char *socket, const struct strbuf *out)
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{
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int got_data = 0;
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int fd = unix_stream_connect(socket);
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if (fd < 0)
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return -1;
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if (write_in_full(fd, out->buf, out->len) < 0)
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die_errno("unable to write to cache daemon");
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shutdown(fd, SHUT_WR);
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while (1) {
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char in[1024];
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int r;
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r = read_in_full(fd, in, sizeof(in));
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if (r == 0)
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break;
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if (r < 0)
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die_errno("read error from cache daemon");
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write_or_die(1, in, r);
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got_data = 1;
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}
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return got_data;
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}
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static void spawn_daemon(const char *socket)
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{
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struct child_process daemon;
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const char *argv[] = { NULL, NULL, NULL };
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char buf[128];
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int r;
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memset(&daemon, 0, sizeof(daemon));
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argv[0] = "git-credential-cache--daemon";
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argv[1] = socket;
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daemon.argv = argv;
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daemon.no_stdin = 1;
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daemon.out = -1;
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if (start_command(&daemon))
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die_errno("unable to start cache daemon");
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r = read_in_full(daemon.out, buf, sizeof(buf));
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if (r < 0)
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die_errno("unable to read result code from cache daemon");
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if (r != 3 || memcmp(buf, "ok\n", 3))
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die("cache daemon did not start: %.*s", r, buf);
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close(daemon.out);
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}
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static void do_cache(const char *socket, const char *action, int timeout,
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int flags)
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{
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struct strbuf buf = STRBUF_INIT;
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strbuf_addf(&buf, "action=%s\n", action);
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strbuf_addf(&buf, "timeout=%d\n", timeout);
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if (flags & FLAG_RELAY) {
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if (strbuf_read(&buf, 0, 0) < 0)
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die_errno("unable to relay credential");
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}
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if (send_request(socket, &buf) < 0) {
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if (errno != ENOENT && errno != ECONNREFUSED)
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die_errno("unable to connect to cache daemon");
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if (flags & FLAG_SPAWN) {
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spawn_daemon(socket);
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if (send_request(socket, &buf) < 0)
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die_errno("unable to connect to cache daemon");
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}
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}
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strbuf_release(&buf);
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}
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int main(int argc, const char **argv)
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{
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char *socket_path = NULL;
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int timeout = 900;
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const char *op;
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const char * const usage[] = {
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"git credential-cache [options] <action>",
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NULL
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};
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struct option options[] = {
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OPT_INTEGER(0, "timeout", &timeout,
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"number of seconds to cache credentials"),
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OPT_STRING(0, "socket", &socket_path, "path",
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"path of cache-daemon socket"),
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OPT_END()
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};
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argc = parse_options(argc, argv, NULL, options, usage, 0);
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if (!argc)
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usage_with_options(usage, options);
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op = argv[0];
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if (!socket_path)
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socket_path = expand_user_path("~/.git-credential-cache/socket");
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if (!socket_path)
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die("unable to find a suitable socket path; use --socket");
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if (!strcmp(op, "exit"))
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do_cache(socket_path, op, timeout, 0);
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else if (!strcmp(op, "get") || !strcmp(op, "erase"))
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do_cache(socket_path, op, timeout, FLAG_RELAY);
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else if (!strcmp(op, "store"))
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do_cache(socket_path, op, timeout, FLAG_RELAY|FLAG_SPAWN);
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else
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; /* ignore unknown operation */
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return 0;
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}
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