Add service commands to manage gcrond services

Signed-off-by: David Oberhollenzer <david.oberhollenzer@tele2.at>

cmd/Makemodule.am

@@ -26,6 +26,11 @@ service_CFLAGS = $(AM_CFLAGS)
 service_LDFLAGS = $(AM_LDFLAGS)
 service_LDADD = libinit.a libcfg.a
 
+if GCROND
+service_SOURCES += cmd/service/schedule.c
+service_SOURCES += cmd/service/unschedule.c
+endif
+
 if USYSLOGD
 syslog_SOURCES = cmd/syslog.c
 syslog_CPPFLAGS = $(AM_CPPFLAGS)

cmd/service/schedule.c

@@ -0,0 +1,90 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * Copyright (C) 2018 - David Oberhollenzer
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdio.h>
+#include <errno.h>
+
+#include "servicecmd.h"
+
+static int cmd_schedule(int argc, char **argv)
+{
+	char *target, *linkname, *ptr;
+	int ret = EXIT_FAILURE;
+	struct stat sb;
+
+	if (check_arguments(argv[0], argc, 2, 2))
+		return EXIT_FAILURE;
+
+	for (ptr = argv[1]; isalnum(*ptr) || *ptr == '_'; ++ptr)
+		;
+
+	if (*ptr != '\0') {
+		fprintf(stderr, "Invalid service name '%s'\n", argv[1]);
+		tell_read_help(argv[0]);
+		return EXIT_FAILURE;
+	}
+
+	if (asprintf(&target, "%s/%s.gcron", TEMPLATEDIR, argv[1]) < 0) {
+		perror("asprintf");
+		return EXIT_FAILURE;
+	}
+
+	if (stat(target, &sb)) {
+		fprintf(stderr, "%s: %s\n", target, strerror(errno));
+		goto out_tgt;
+	}
+
+	if ((sb.st_mode & S_IFMT) != S_IFREG) {
+		fprintf(stderr, "%s: must be a regular file\n", target);
+		goto out_tgt;
+	}
+
+	if (asprintf(&linkname, "%s/%s", GCRONDIR, argv[1]) < 0) {
+		perror("asprintf");
+		goto out_tgt;
+	}
+
+	if (symlink(target, linkname)) {
+		fprintf(stderr, "creating symlink '%s' -> '%s: %s\n",
+			linkname, target, strerror(errno));
+		goto out;
+	}
+
+	ret = EXIT_SUCCESS;
+out:
+	free(linkname);
+out_tgt:
+	free(target);
+	return ret;
+}
+
+static command_t schedule = {
+	.cmd = "schedule",
+	.usage = "<name>",
+	.s_desc = "enable a gcrond service",
+	.l_desc = "This marks a gcrond service as enabled by creating a "
+		  "symlink in " GCRONDIR " pointing to a template file in "
+		  TEMPLATEDIR " with a .gcron extension.",
+	.run_cmd = cmd_schedule,
+};
+
+REGISTER_COMMAND(schedule)

cmd/service/service.8

@@ -28,6 +28,12 @@ configuration directory, pointing to the service template file.
 
 An optional argument can be supplied to parameterize the template.
 .TP
+.BR schedule " " \fI<service>\fP
+If built with support for gcrond, enable a gcron service by creating a symlink
+in the gcrond configuration directory, pointing to the service file.
+
+The extension \fB.gcron\fP is automatically appended to the service name.
+.TP
 .BR disable " " \fI<command>\fP " " \fI[arguments]\fP
 Disable (but do not stop) a system service by removing the corresponding
 symlink in the configuration directory.
@@ -35,8 +41,11 @@ symlink in the configuration directory.
 If the service is parameterized, arguments have to be specified to disable
 the desired service instance.
 .TP
+.BR unschedule " " \fI<service>\fP
+If built with support for gcrond, disable a gcron service by removing the
+corresponding symlink in the gcron configuration directory.
+.TP
 .BR dumpscript " " \fI<command>\fP " " \fI[arguments]\fP
-
 Parse a service file from and produce a pseudo shell script containing the
 exact commands executed when starting the service.
 .SH AVAILABILITY

cmd/service/unschedule.c

@@ -0,0 +1,82 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * Copyright (C) 2018 - David Oberhollenzer
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdio.h>
+#include <errno.h>
+
+#include "servicecmd.h"
+
+static int cmd_unschedule(int argc, char **argv)
+{
+	int ret = EXIT_FAILURE;
+	char *linkname, *ptr;
+	struct stat sb;
+
+	if (check_arguments(argv[0], argc, 2, 2))
+		return EXIT_FAILURE;
+
+	for (ptr = argv[1]; isalnum(*ptr) || *ptr == '_'; ++ptr)
+		;
+
+	if (*ptr != '\0') {
+		fprintf(stderr, "Invalid service name '%s'\n", argv[1]);
+		tell_read_help(argv[0]);
+		return EXIT_FAILURE;
+	}
+
+	if (asprintf(&linkname, "%s/%s.gcron", GCRONDIR, argv[1]) < 0) {
+		perror("asprintf");
+		return EXIT_FAILURE;
+	}
+
+	if (lstat(linkname, &sb)) {
+		fprintf(stderr, "lstat %s: %s\n", linkname, strerror(errno));
+		goto out;
+	}
+
+	if ((sb.st_mode & S_IFMT) != S_IFLNK) {
+		fprintf(stderr, "error: '%s' is not a symlink!", linkname);
+		goto out;
+	}
+
+	if (unlink(linkname)) {
+		fprintf(stderr, "removing %s: %s\n",
+			linkname, strerror(errno));
+		goto out;
+	}
+
+	ret = EXIT_SUCCESS;
+out:
+	free(linkname);
+	return ret;
+}
+
+static command_t unschedule = {
+	.cmd = "unschedule",
+	.usage = "<name>",
+	.s_desc = "disable a gcrond service",
+	.l_desc = "This disables a gcrond service by removing the coresponding "
+		  "symlink in " GCRONDIR ".",
+	.run_cmd = cmd_unschedule,
+};
+
+REGISTER_COMMAND(unschedule)