doveadm: Added "service stop" command to stop specific services.

src/doveadm/Makefile.am

@@ -76,6 +76,7 @@ doveadm_common_cmds = \
 	doveadm-penalty.c \
 	doveadm-proxy.c \
 	doveadm-replicator.c \
+	doveadm-service.c \
 	doveadm-sis.c \
 	doveadm-stats.c \
 	doveadm-who.c

src/doveadm/doveadm-cmd.c

@@ -19,6 +19,7 @@ static struct doveadm_cmd *doveadm_commands[] = {
 };
 
 static struct doveadm_cmd_ver2 *doveadm_commands_ver2[] = {
+	&doveadm_cmd_service_stop_ver2,
 	&doveadm_cmd_stop_ver2,
 	&doveadm_cmd_reload_ver2,
 	&doveadm_cmd_stats_dump_ver2,

src/doveadm/doveadm-cmd.h

@@ -146,6 +146,7 @@ bool doveadm_cmd_param_istream(const struct doveadm_cmd_context *cctx,
 void doveadm_cmd_params_clean(ARRAY_TYPE(doveadm_cmd_param_arr_t) *pargv);
 void doveadm_cmd_params_null_terminate_arrays(ARRAY_TYPE(doveadm_cmd_param_arr_t) *pargv);
 
+extern struct doveadm_cmd_ver2 doveadm_cmd_service_stop_ver2;
 extern struct doveadm_cmd_ver2 doveadm_cmd_stop_ver2;
 extern struct doveadm_cmd_ver2 doveadm_cmd_reload_ver2;
 extern struct doveadm_cmd_ver2 doveadm_cmd_stats_reset_ver2;

src/doveadm/doveadm-service.c

@@ -0,0 +1,60 @@
+/* Copyright (c) 2016 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "str.h"
+#include "write-full.h"
+#include "istream.h"
+#include "doveadm.h"
+
+#include <unistd.h>
+
+static void cmd_service_stop(int argc, char *argv[])
+{
+	const char *path, *line;
+	int fd;
+
+	if (argc == 1)
+		help_ver2(&doveadm_cmd_service_stop_ver2);
+
+	path = t_strconcat(doveadm_settings->base_dir, "/master", NULL);
+	fd = net_connect_unix(path);
+	if (fd == -1)
+		i_fatal("net_connect_unix(%s) failed: %m", path);
+	net_set_nonblock(fd, FALSE);
+
+	string_t *cmd = t_str_new(128);
+	str_append(cmd, "VERSION\tmaster-client\t1\t0\nSTOP");
+	for (int i = 1; i < argc; i++) {
+		str_append_c(cmd, '\t');
+		str_append(cmd, argv[i]);
+	}
+	str_append_c(cmd, '\n');
+	if (write_full(fd, str_data(cmd), str_len(cmd)) < 0)
+		i_error("write(%s) failed: %m", path);
+
+	alarm(5);
+	struct istream *input = i_stream_create_fd(fd, IO_BLOCK_SIZE, FALSE);
+	if (i_stream_read_next_line(input) == NULL ||
+	    (line = i_stream_read_next_line(input)) == NULL) {
+		i_error("read(%s) failed: %s", path, i_stream_get_error(input));
+		doveadm_exit_code = EX_TEMPFAIL;
+	} else if (line[0] == '-') {
+		doveadm_exit_code = DOVEADM_EX_NOTFOUND;
+		i_error("%s", line+1);
+	} else if (line[0] != '+') {
+		i_error("Unexpected input from %s: %s", path, line);
+		doveadm_exit_code = EX_TEMPFAIL;
+	}
+	alarm(0);
+	i_stream_destroy(&input);
+	i_close_fd(&fd);
+}
+
+struct doveadm_cmd_ver2 doveadm_cmd_service_stop_ver2 = {
+	.old_cmd = cmd_service_stop,
+	.name = "service stop",
+	.usage = "<service> [<service> [...]]",
+DOVEADM_CMD_PARAMS_START
+DOVEADM_CMD_PARAM('\0', "service", CMD_PARAM_ARRAY, CMD_PARAM_FLAG_POSITIONAL)
+DOVEADM_CMD_PARAMS_END
+};