Remove cron daemon, rewritten and split off into seperate repo

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

18 files changed, 2 insertions, 1266 deletions

diff --git a/Makefile.am b/Makefile.am
index f818627..5d38113 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -21,7 +21,6 @@ dist_man8_MANS =
 include lib/Makemodule.am
 include cmd/Makemodule.am
 include initd/Makemodule.am
-include crond/Makemodule.am
 
 install-exec-hook:
 	(cd $(DESTDIR)$(sbindir); $(LN_S) shutdown reboot)
@@ -31,6 +30,3 @@ install-data-local:
 	(cd $(DESTDIR)$(man8dir); $(LN_S) shutdown.8 reboot.8)
 	$(MKDIR_P) $(DESTDIR)$(SVCDIR)
 	$(MKDIR_P) $(DESTDIR)$(TEMPLATEDIR)
-if GCROND
-	$(MKDIR_P) $(DESTDIR)$(GCRONDIR)
-endif
diff --git a/README.md b/README.md
index 2ddf025..bf76487 100644
--- a/README.md
+++ b/README.md
@@ -1,9 +1,8 @@
 # About
 
 This directory contains the source code for a tiny service supervision
-framework devised for the Pygos system, consisting of an init daemon,
-a _definitely_ non standards compliant cron implementation and various
-command line utilities.
+framework devised for the Pygos system, consisting of an init daemon and
+accompanying command line utilities.
 
 
 The programs of this package are developed first and foremost for GNU/Linux
@@ -46,8 +45,6 @@ command line tools.
 See [docs/services.md](docs/services.md) for more information on service
 description files.
 
-See [docs/gcron.md](docs/gcron.md) for details on the cron implementation.
-
 
 ## Why
 
diff --git a/cmd/Makemodule.am b/cmd/Makemodule.am
index ea25ea8..07b50ce 100644
--- a/cmd/Makemodule.am
+++ b/cmd/Makemodule.am
@@ -26,11 +26,6 @@ service_CFLAGS = $(AM_CFLAGS)
 service_LDFLAGS = $(AM_LDFLAGS)
 service_LDADD = libinit.a libcfg.a libutil.a
 
-if GCROND
-service_SOURCES += cmd/service/schedule.c
-service_SOURCES += cmd/service/unschedule.c
-endif
-
 dist_man8_MANS += cmd/shutdown.8 cmd/service/service.8
 
 EXTRA_DIST += $(SRVHEADERS)
diff --git a/cmd/service/schedule.c b/cmd/service/schedule.c
deleted file mode 100644
index 41a4f1d..0000000
--- a/cmd/service/schedule.c
+++ /dev/null
@@ -1,90 +0,0 @@
-/* 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)
diff --git a/cmd/service/service.8 b/cmd/service/service.8
index 3ca7cb2..139bdb5 100644
--- a/cmd/service/service.8
+++ b/cmd/service/service.8
@@ -28,12 +28,6 @@ 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<service>\fP " " \fI[arguments]\fP
 Disable (but do not stop) a system service by removing the corresponding
 symlink in the configuration directory.
@@ -41,10 +35,6 @@ 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<service>\fP " " \fI[arguments]\fP
 Parse a service file from and produce a pseudo shell script containing the
 exact commands executed when starting the service.
diff --git a/cmd/service/unschedule.c b/cmd/service/unschedule.c
deleted file mode 100644
index aea6982..0000000
--- a/cmd/service/unschedule.c
+++ /dev/null
@@ -1,82 +0,0 @@
-/* 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)
diff --git a/configure.ac b/configure.ac
index 07964d9..bb747f5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -36,20 +36,8 @@ UL_WARN_ADD([-pedantic])
 
 AC_SUBST([WARN_CFLAGS])
 
-
-AC_ARG_WITH([gcrond],
-	[AS_HELP_STRING([--without-gcrond], [Build without gcron daemon])],
-	[case "${withval}" in
-	yes) AM_CONDITIONAL([GCROND], [true]) ;;
-	no) AM_CONDITIONAL([GCROND], [false]) ;;
-	*) AC_MSG_ERROR([bad value ${withval} for --without-gcron]) ;;
-	esac],
-	[AM_CONDITIONAL([GCROND], [true])])
-
-
 AC_CONFIG_HEADERS([lib/include/config.h])
 AC_DEFINE_DIR(SVCDIR, sysconfdir/init.d, [Startup service directory])
-AC_DEFINE_DIR(GCRONDIR, sysconfdir/gcron.d, [Cron service directory])
 AC_DEFINE_DIR(TEMPLATEDIR, datadir/init, [Service template directory])
 AC_DEFINE_DIR(SCRIPTDIR, libexecdir/init, [Helper script directory])
 AC_DEFINE_DIR(SOCKDIR, localstatedir/run, [Directory for initd socket])
diff --git a/crond/Makemodule.am b/crond/Makemodule.am
deleted file mode 100644
index b2eb1c7..0000000
--- a/crond/Makemodule.am
+++ /dev/null
@@ -1,11 +0,0 @@
-if GCROND
-gcrond_SOURCES = crond/main.c crond/gcrond.h crond/runjob.c
-gcrond_SOURCES += crond/rdcron.c crond/delcron.c crond/crontab.c
-gcrond_SOURCES += crond/cronscan.c crond/crontab.h
-gcrond_CPPFLAGS = $(AM_CPPFLAGS)
-gcrond_CFLAGS = $(AM_CFLAGS)
-gcrond_LDFLAGS = $(AM_LDFLAGS)
-gcrond_LDADD = libcfg.a libutil.a
-
-sbin_PROGRAMS += gcrond
-endif
diff --git a/crond/cronscan.c b/crond/cronscan.c
deleted file mode 100644
index e28fb03..0000000
--- a/crond/cronscan.c
+++ /dev/null
@@ -1,77 +0,0 @@
-/* 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 <stddef.h>
-#include <dirent.h>
-#include <string.h>
-#include <errno.h>
-#include <stdio.h>
-#include <fcntl.h>
-#include <ctype.h>
-
-#include "crontab.h"
-
-int cronscan(const char *directory, crontab_t **list)
-{
-	struct dirent *ent;
-	int dfd, ret = 0;
-	crontab_t *cron;
-	DIR *dir;
-
-	dir = opendir(directory);
-	if (dir == NULL) {
-		perror(directory);
-		return -1;
-	}
-
-	dfd = dirfd(dir);
-	if (dfd < 0) {
-		perror(directory);
-		closedir(dir);
-		return -1;
-	}
-
-	for (;;) {
-		errno = 0;
-		ent = readdir(dir);
-
-		if (ent == NULL) {
-			if (errno != 0) {
-				perror(directory);
-				ret = -1;
-			}
-			break;
-		}
-
-		if (!strcmp(ent->d_name, ".") || !strcmp(ent->d_name, ".."))
-			continue;
-
-		cron = rdcron(dfd, ent->d_name);
-		if (cron == NULL) {
-			ret = -1;
-			continue;
-		}
-
-		cron->next = *list;
-		*list = cron;
-	}
-
-	closedir(dir);
-	return ret;
-}
diff --git a/crond/crontab.c b/crond/crontab.c
deleted file mode 100644
index f761ec0..0000000
--- a/crond/crontab.c
+++ /dev/null
@@ -1,50 +0,0 @@
-/* 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 <string.h>
-
-#include "crontab.h"
-
-void cron_tm_to_mask(crontab_t *out, struct tm *t)
-{
-	memset(out, 0, sizeof(*out));
-	out->minute     = 1UL << ((unsigned long)t->tm_min);
-	out->hour       = 1 << t->tm_hour;
-	out->dayofmonth = 1 << (t->tm_mday - 1);
-	out->month      = 1 << t->tm_mon;
-	out->dayofweek  = 1 << t->tm_wday;
-}
-
-bool cron_should_run(const crontab_t *t, const crontab_t *mask)
-{
-	if ((t->minute & mask->minute) == 0)
-		return false;
-
-	if ((t->hour & mask->hour) == 0)
-		return false;
-
-	if ((t->dayofmonth & mask->dayofmonth) == 0)
-		return false;
-
-	if ((t->month & mask->month) == 0)
-		return false;
-
-	if ((t->dayofweek & mask->dayofweek) == 0)
-		return false;
-
-	return true;
-}
diff --git a/crond/crontab.h b/crond/crontab.h
deleted file mode 100644
index 1ea3883..0000000
--- a/crond/crontab.h
+++ /dev/null
@@ -1,55 +0,0 @@
-/* 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/>.
- */
-#ifndef CRONTAB_H
-#define CRONTAB_H
-
-#include <sys/types.h>
-#include <stdbool.h>
-#include <stdint.h>
-#include <time.h>
-
-#include "service.h"
-
-typedef struct crontab_t {
-	struct crontab_t *next;
-	exec_t *exec;
-	char *ctty;
-
-	uid_t uid;
-	gid_t gid;
-
-	uint64_t minute;
-	uint32_t hour;
-	uint32_t dayofmonth;
-	uint16_t month;
-	uint8_t dayofweek;
-
-	unsigned int tty_truncate : 1;
-} crontab_t;
-
-crontab_t *rdcron(int dirfd, const char *filename);
-
-void delcron(crontab_t *cron);
-
-int cronscan(const char *directory, crontab_t **list);
-
-void cron_tm_to_mask(crontab_t *out, struct tm *t);
-
-bool cron_should_run(const crontab_t *t, const crontab_t *mask);
-
-#endif /* CRONTAB_H */
diff --git a/crond/delcron.c b/crond/delcron.c
deleted file mode 100644
index 1877db1..0000000
--- a/crond/delcron.c
+++ /dev/null
@@ -1,38 +0,0 @@
-/* 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 <stdlib.h>
-
-#include "crontab.h"
-
-void delcron(crontab_t *cron)
-{
-	exec_t *e;
-
-	if (cron == NULL)
-		return;
-
-	while (cron->exec != NULL) {
-		e = cron->exec;
-		cron->exec = e->next;
-
-		free(e);
-	}
-
-	free(cron->ctty);
-	free(cron);
-}
diff --git a/crond/gcrond.h b/crond/gcrond.h
deleted file mode 100644
index 4cc2417..0000000
--- a/crond/gcrond.h
+++ /dev/null
@@ -1,37 +0,0 @@
-/* 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/>.
- */
-#ifndef GCROND_H
-#define GCROND_H
-
-#include <sys/types.h>
-#include <sys/wait.h>
-#include <string.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <signal.h>
-#include <stdio.h>
-#include <errno.h>
-
-#include "crontab.h"
-#include "config.h"
-#include "util.h"
-
-int runjob(crontab_t *tab);
-
-#endif /* GCROND_H */
-
diff --git a/crond/main.c b/crond/main.c
deleted file mode 100644
index 613a1ae..0000000
--- a/crond/main.c
+++ /dev/null
@@ -1,135 +0,0 @@
-/* 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 "gcrond.h"
-
-static crontab_t *jobs;
-static sig_atomic_t run = 1;
-static sig_atomic_t rescan = 1;
-
-static void read_config(void)
-{
-	if (cronscan(GCRONDIR, &jobs)) {
-		fputs("Error reading configuration. Continuing anyway.\n",
-		      stderr);
-	}
-}
-
-static void cleanup_config(void)
-{
-	crontab_t *t;
-
-	while (jobs != NULL) {
-		t = jobs;
-		jobs = jobs->next;
-		delcron(t);
-	}
-}
-
-static int calc_timeout(void)
-{
-	time_t now = time(NULL), future;
-	struct tm tmstruct;
-	crontab_t mask, *t;
-	int minutes;
-
-	for (minutes = 0; minutes < 120; ++minutes) {
-		future = now + minutes * 60;
-
-		localtime_r(&future, &tmstruct);
-		cron_tm_to_mask(&mask, &tmstruct);
-
-		for (t = jobs; t != NULL; t = t->next) {
-			if (cron_should_run(t, &mask))
-				goto out;
-		}
-	}
-out:
-	return minutes ? minutes * 60 : 60;
-}
-
-static void runjobs(void)
-{
-	time_t now = time(NULL);
-	struct tm tmstruct;
-	crontab_t mask, *t;
-
-	localtime_r(&now, &tmstruct);
-	cron_tm_to_mask(&mask, &tmstruct);
-
-	for (t = jobs; t != NULL; t = t->next) {
-		if (cron_should_run(t, &mask))
-			runjob(t);
-	}
-}
-
-static void sighandler(int signo)
-{
-	pid_t pid;
-
-	switch (signo) {
-	case SIGINT:
-	case SIGTERM:
-		run = 0;
-		break;
-	case SIGHUP:
-		rescan = 1;
-		break;
-	case SIGCHLD:
-		while ((pid = waitpid(-1, NULL, WNOHANG)) != -1)
-			;
-		break;
-	}
-}
-
-int main(void)
-{
-	struct timespec stime;
-	struct sigaction act;
-	int timeout;
-
-	memset(&act, 0, sizeof(act));
-	act.sa_handler = sighandler;
-	sigaction(SIGINT, &act, NULL);
-	sigaction(SIGTERM, &act, NULL);
-	sigaction(SIGHUP, &act, NULL);
-	sigaction(SIGCHLD, &act, NULL);
-
-	while (run) {
-		if (rescan == 1) {
-			cleanup_config();
-			read_config();
-			timeout = 60;
-			rescan = 0;
-		} else {
-			runjobs();
-			timeout = calc_timeout();
-		}
-
-		stime.tv_sec = timeout;
-		stime.tv_nsec = 0;
-
-		while (nanosleep(&stime, &stime) != 0 && run && !rescan) {
-			if (errno != EINTR) {
-				perror("nanosleep");
-				break;
-			}
-		}
-	}
-
-	return EXIT_SUCCESS;
-}
diff --git a/crond/rdcron.c b/crond/rdcron.c
deleted file mode 100644
index 8781a6f..0000000
--- a/crond/rdcron.c
+++ /dev/null
@@ -1,503 +0,0 @@
-/* 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 <unistd.h>
-#include <string.h>
-#include <stdlib.h>
-#include <limits.h>
-#include <stdio.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <ctype.h>
-#include <pwd.h>
-#include <grp.h>
-
-#include "crontab.h"
-#include "libcfg.h"
-#include "util.h"
-
-
-static const enum_map_t weekday[] = {
-	{ "MON", 1 },
-	{ "TUE", 2 },
-	{ "WED", 3 },
-	{ "THU", 4 },
-	{ "FRI", 5 },
-	{ "SAT", 6 },
-	{ "SUN", 0 },
-};
-
-static const enum_map_t month[] = {
-	{ "JAN", 1 },
-	{ "FEB", 2 },
-	{ "MAR", 3 },
-	{ "APR", 4 },
-	{ "MAY", 5 },
-	{ "JUN", 6 },
-	{ "JUL", 7 },
-	{ "AUG", 8 },
-	{ "SEP", 9 },
-	{ "OCT", 10 },
-	{ "NOV", 11 },
-	{ "DEC", 12 },
-};
-
-static const struct {
-	const char *macro;
-	crontab_t tab;
-} intervals[] = {
-	{
-		.macro = "yearly",
-		.tab = {
-			.minute = 0x01,
-			.hour = 0x01,
-			.dayofmonth = 0x01,
-			.month = 0x01,
-			.dayofweek = 0xFF
-		},
-	}, {
-		.macro = "annually",
-		.tab = {
-			.minute = 0x01,
-			.hour = 0x01,
-			.dayofmonth = 0x01,
-			.month = 0x01,
-			.dayofweek = 0xFF
-		},
-	}, {
-		.macro = "monthly",
-		.tab = {
-			.minute = 0x01,
-			.hour = 0x01,
-			.dayofmonth = 0x01,
-			.month = 0xFFFF,
-			.dayofweek = 0xFF
-		},
-	}, {
-		.macro = "weekly",
-		.tab = {
-			.minute = 0x01,
-			.hour = 0x01,
-			.dayofmonth = 0xFFFFFFFF,
-			.month = 0xFFFF,
-			.dayofweek = 0x01
-		},
-	}, {
-		.macro = "daily",
-		.tab = {
-			.minute = 0x01,
-			.hour = 0x01,
-			.dayofmonth = 0xFFFFFFFF,
-			.month = 0xFFFF,
-			.dayofweek = 0xFF
-		},
-	}, {
-		.macro = "hourly",
-		.tab = {
-			.minute = 0x01,
-			.hour = 0xFFFFFFFF,
-			.dayofmonth = 0xFFFFFFFF,
-			.month = 0xFFFF,
-			.dayofweek = 0xFF
-		},
-	},
-};
-
-/*****************************************************************************/
-
-static int try_unescape(char *arg, rdline_t *rd)
-{
-	if (unescape(arg)) {
-		fprintf(stderr, "%s: %zu: malformed string constant\n",
-			rd->filename, rd->lineno);
-		return -1;
-	}
-	return 0;
-}
-
-static char *try_strdup(const char *str, rdline_t *rd)
-{
-	char *out = strdup(str);
-
-	if (out == NULL) {
-		fprintf(stderr, "%s: %zu: out of memory\n",
-			rd->filename, rd->lineno);
-	}
-	return out;
-}
-
-static char *readnum(char *line, int *out, int minval, int maxval,
-		     const enum_map_t *mnemonic, rdline_t *rd)
-{
-	int i, temp, value = 0;
-	const enum_map_t *ev;
-
-	if (!isdigit(*line)) {
-		if (!mnemonic)
-			goto fail_mn;
-
-		for (i = 0; isalnum(line[i]); ++i)
-			;
-		if (i == 0)
-			goto fail_mn;
-
-		temp = line[i];
-		line[i] = '\0';
-		ev = enum_by_name(mnemonic, line);
-		if (!ev) {
-			fprintf(stderr, "%s: %zu: unexpected '%s'",
-				rd->filename, rd->lineno, line);
-		}
-		line[i] = temp;
-		if (!ev)
-			return NULL;
-		*out = ev->value;
-		return line + i;
-	}
-
-	while (isdigit(*line)) {
-		i = ((*(line++)) - '0');
-		if (value > (maxval - i) / 10)
-			goto fail_of;
-		value = value * 10 + i;
-	}
-
-	if (value < minval)
-		goto fail_uf;
-
-	*out = value;
-	return line;
-fail_of:
-	fprintf(stderr, "%s: %zu: value exceeds maximum (%d > %d)\n",
-		rd->filename, rd->lineno, value, maxval);
-	return NULL;
-fail_uf:
-	fprintf(stderr, "%s: %zu: value too small (%d < %d)\n",
-		rd->filename, rd->lineno, value, minval);
-	return NULL;
-fail_mn:
-	fprintf(stderr, "%s: %zu: expected numeric value",
-		rd->filename, rd->lineno);
-	return NULL;
-}
-
-static char *readfield(char *line, uint64_t *out, int minval, int maxval,
-		       const enum_map_t *mnemonic, rdline_t *rd)
-{
-	int value, endvalue, step;
-	uint64_t v = 0;
-next:
-	if (*line == '*') {
-		++line;
-		value = minval;
-		endvalue = maxval;
-	} else {
-		line = readnum(line, &value, minval, maxval, mnemonic, rd);
-		if (!line)
-			goto fail;
-
-		if (*line == '-') {
-			line = readnum(line + 1, &endvalue, minval, maxval,
-				       mnemonic, rd);
-			if (!line)
-				goto fail;
-		} else {
-			endvalue = value;
-		}
-	}
-
-	if (endvalue < value)
-		goto fail;
-
-	if (*line == '/') {
-		line = readnum(line + 1, &step, 1, maxval + 1, NULL, rd);
-		if (!line)
-			goto fail;
-	} else {
-		step = 1;
-	}
-
-	while (value <= endvalue) {
-		v |= 1UL << (unsigned long)(value - minval);
-		value += step;
-	}
-
-	if (*line == ',' || *line == ' ') {
-		++line;
-		goto next;
-	}
-
-	if (*line != '\0')
-		goto fail;
-
-	*out = v;
-	return line;
-fail:
-	fprintf(stderr, "%s: %zu: invalid time range expression\n",
-		rd->filename, rd->lineno);
-	return NULL;
-}
-
-/*****************************************************************************/
-
-static int cron_exec(void *user, char *arg, rdline_t *rd, int flags)
-{
-	crontab_t *cron = user;
-	exec_t *e, *end;
-	(void)flags;
-
-	e = calloc(1, sizeof(*e) + strlen(arg) + 1);
-	if (e == NULL) {
-		fprintf(stderr, "%s: %zu: out of memory\n",
-			rd->filename, rd->lineno);
-		return -1;
-	}
-
-	strcpy(e->args, arg);
-
-	e->argc = pack_argv(e->args);
-	if (e->argc < 0) {
-		fprintf(stderr, "%s: %zu: malformed string constant\n",
-			rd->filename, rd->lineno);
-		return -1;
-	}
-
-	if (cron->exec == NULL) {
-		cron->exec = e;
-	} else {
-		for (end = cron->exec; end->next != NULL; end = end->next)
-			;
-		end->next = e;
-	}
-	return 0;
-}
-
-static int cron_hour(void *user, char *arg, rdline_t *rd, int flags)
-{
-	crontab_t *cron = user;
-	uint64_t value;
-	(void)flags;
-
-	if (!readfield(arg, &value, 0, 23, NULL, rd))
-		return -1;
-
-	cron->hour = value;
-	return 0;
-}
-
-static int cron_minute(void *user, char *arg, rdline_t *rd, int flags)
-{
-	crontab_t *cron = user;
-	uint64_t value;
-	(void)flags;
-
-	if (!readfield(arg, &value, 0, 59, NULL, rd))
-		return -1;
-
-	cron->minute = value;
-	return 0;
-}
-
-static int cron_dayofmonth(void *user, char *arg, rdline_t *rd, int flags)
-{
-	crontab_t *cron = user;
-	uint64_t value;
-	(void)flags;
-
-	if (!readfield(arg, &value, 1, 31, NULL, rd))
-		return -1;
-
-	cron->dayofmonth = value;
-	return 0;
-}
-
-static int cron_dayofweek(void *user, char *arg, rdline_t *rd, int flags)
-{
-	crontab_t *cron = user;
-	uint64_t value;
-	(void)flags;
-
-	if (!readfield(arg, &value, 0, 6, weekday, rd))
-		return -1;
-
-	cron->dayofweek = value;
-	return 0;
-}
-
-static int cron_month(void *user, char *arg, rdline_t *rd, int flags)
-{
-	crontab_t *cron = user;
-	uint64_t value;
-	(void)flags;
-
-	if (!readfield(arg, &value, 1, 12, month, rd))
-		return -1;
-
-	cron->month = value;
-	return 0;
-}
-
-static int cron_interval(void *user, char *arg, rdline_t *rd, int flags)
-{
-	crontab_t *cron = user;
-	size_t i;
-	(void)flags;
-
-	for (i = 0; i < ARRAY_SIZE(intervals); ++i) {
-		if (!strcmp(intervals[i].macro, arg)) {
-			cron->minute = intervals[i].tab.minute;
-			cron->hour = intervals[i].tab.hour;
-			cron->dayofmonth = intervals[i].tab.dayofmonth;
-			cron->month = intervals[i].tab.month;
-			cron->dayofweek = intervals[i].tab.dayofweek;
-			return 0;
-		}
-	}
-
-	fprintf(stderr, "%s: %zu: unknown interval '%s'\n",
-		rd->filename, rd->lineno, arg);
-	return -1;
-}
-
-static int cron_user(void *user, char *arg, rdline_t *rd, int flags)
-{
-	crontab_t *cron = user;
-	struct passwd *pwd;
-	bool isnumeric;
-	char *ptr;
-	int value;
-	(void)flags;
-
-	for (ptr = arg; isdigit(*ptr); ++ptr)
-		;
-
-	isnumeric = (*ptr == '\0');
-	pwd = getpwnam(arg);
-
-	if (pwd == NULL && !isnumeric) {
-		fprintf(stderr, "%s: %zu: unknown user '%s'\n",
-			rd->filename, rd->lineno, arg);
-		return -1;
-	}
-
-	if (pwd != NULL) {
-		cron->uid = pwd->pw_uid;
-	} else {
-		if (readnum(arg, &value, 0, INT_MAX, NULL, rd))
-			return -1;
-		cron->uid = value;
-	}
-	return 0;
-}
-
-static int cron_group(void *user, char *arg, rdline_t *rd, int flags)
-{
-	crontab_t *cron = user;
-	struct group *group;
-	bool isnumeric;
-	char *ptr;
-	int value;
-	(void)flags;
-
-	for (ptr = arg; isdigit(*ptr); ++ptr)
-		;
-
-	isnumeric = (*ptr == '\0');
-	group = getgrnam(arg);
-
-	if (group == NULL && !isnumeric) {
-		fprintf(stderr, "%s: %zu: unknown group '%s'\n",
-			rd->filename, rd->lineno, arg);
-		return -1;
-	}
-
-	if (group != NULL) {
-		cron->gid = group->gr_gid;
-	} else {
-		if (readnum(arg, &value, 0, INT_MAX, NULL, rd))
-			return -1;
-		cron->gid = value;
-	}
-	return 0;
-}
-
-static int cron_tty(void *user, char *arg, rdline_t *rd, int flags)
-{
-	crontab_t *cron = user;
-	(void)flags;
-
-	if (strncmp(arg, "truncate", 8) == 0 && isspace(arg[8])) {
-		cron->tty_truncate = 1;
-		arg += 8;
-		while (isspace(*arg))
-			++arg;
-	}
-
-	if (try_unescape(arg, rd))
-		return -1;
-
-	cron->ctty = try_strdup(arg, rd);
-	return cron->ctty == NULL ? -1 : 0;
-}
-
-
-
-static const cfg_param_t cron_params[] = {
-	{ "hour", 0, cron_hour },
-	{ "minute", 0, cron_minute },
-	{ "dayofmonth", 0, cron_dayofmonth },
-	{ "dayofweek", 0, cron_dayofweek },
-	{ "month", 0, cron_month },
-	{ "interval", 0, cron_interval },
-	{ "user", 0, cron_user },
-	{ "group", 0, cron_group },
-	{ "tty", 0, cron_tty },
-	{ "exec", 1, cron_exec },
-};
-
-crontab_t *rdcron(int dirfd, const char *filename)
-{
-	crontab_t *cron = NULL;
-	rdline_t rd;
-	int ret;
-
-	if (rdline_init(&rd, dirfd, filename, 0, NULL))
-		return NULL;
-
-	cron = calloc(1, sizeof(*cron));
-	if (cron == NULL) {
-		fputs("out of memory\n", stderr);
-		goto out;
-	}
-
-	cron->minute = 0xFFFFFFFFFFFFFFFFUL;
-	cron->hour = 0xFFFFFFFF;
-	cron->dayofmonth = 0xFFFFFFFF;
-	cron->month = 0xFFFF;
-	cron->dayofweek = 0xFF;
-
-	ret = rdcfg(cron, &rd, cron_params, ARRAY_SIZE(cron_params), 0);
-	if (ret) {
-		delcron(cron);
-		cron = NULL;
-	}
-out:
-	rdline_cleanup(&rd);
-	return cron;
-}
diff --git a/crond/runjob.c b/crond/runjob.c
deleted file mode 100644
index 83c4278..0000000
--- a/crond/runjob.c
+++ /dev/null
@@ -1,86 +0,0 @@
-/* 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 "gcrond.h"
-
-int runjob(crontab_t *tab)
-{
-	struct sigaction act;
-	pid_t pid;
-	exec_t *e;
-	int ret;
-
-	if (tab->exec == NULL)
-		return 0;
-
-	pid = fork();
-	if (pid == -1) {
-		perror("fork");
-		return -1;
-	}
-
-	if (pid != 0)
-		return 0;
-
-	/* XXX: inside the child process */
-	memset(&act, 0, sizeof(act));
-	act.sa_handler = SIG_DFL;
-	sigaction(SIGINT, &act, NULL);
-	sigaction(SIGTERM, &act, NULL);
-	sigaction(SIGHUP, &act, NULL);
-	sigaction(SIGCHLD, &act, NULL);
-
-	if (setup_tty(tab->ctty, tab->tty_truncate))
-		exit(EXIT_FAILURE);
-
-	if (tab->gid != 0) {
-		if (setresgid(tab->gid, tab->gid, tab->gid)) {
-			perror("setgid");
-			exit(EXIT_FAILURE);
-		}
-	}
-
-	if (tab->uid != 0) {
-		if (setresuid(tab->uid, tab->uid, tab->uid)) {
-			perror("setuid");
-			exit(EXIT_FAILURE);
-		}
-	}
-
-	if (tab->exec->next == NULL)
-		argv_exec(tab->exec);
-
-	for (e = tab->exec; e != NULL; e = e->next) {
-		pid = fork();
-		if (pid == -1) {
-			perror("fork");
-			exit(EXIT_FAILURE);
-		}
-
-		if (pid == 0)
-			argv_exec(e);
-
-		while (waitpid(pid, &ret, 0) != pid)
-			;
-
-		ret = WIFEXITED(ret) ? WEXITSTATUS(ret) : EXIT_FAILURE;
-		if (ret != EXIT_SUCCESS)
-			break;
-	}
-
-	exit(ret);
-}
diff --git a/docs/cmdline.md b/docs/cmdline.md
index e47cd8e..8967e4a 100644
--- a/docs/cmdline.md
+++ b/docs/cmdline.md
@@ -13,10 +13,6 @@ Currently available service commands are:
  * disable - disable a service. If the service is parameterized, requires the
    same arguments used for enabling, to disable the specific instance of the
    service.
- * schedule - enable a gcrond service. Only available if this package is built
-   with gcrond.
- * unschedule - disnable a gcrond service. Only available if this package is
-   built with gcrond.
  * dumpscript - generate an equivalent shell script from the `exec` lines of
    a service after applying all parameter substitutions.
  * list - list all enabled service. A target can be specified to only list
diff --git a/docs/gcron.md b/docs/gcron.md
deleted file mode 100644
index 4327083..0000000
--- a/docs/gcron.md
+++ /dev/null
@@ -1,62 +0,0 @@
-# Gcron
-
-Gcron is a small daemon that executes batch commands once a certain
-condition is met.
-
-In a typical installation, it reads configuration files from `/etc/gcron.d`.
-If used together with the init system in this package, the `service` command
-can be used to administer symlinks in that directory, pointing
-to `/usr/share/init/<name>.gcron`.
-
-Each file in the configuration directory represents a single scheduled batch
-job. The syntax and most of the keywords are similar to `initd` service files
-(See [services.md](services.md)).
-
-## Cron Style Patterns
-
-The following keywords can be used to specify classic cron style patterns for
-when a job should be run:
-
- * `hour`
- * `minute`
- * `dayofmonth`
- * `dayofweek`
- * `month`
-
-For each of those keywords, a comma separated sequence of times can be
-specified. Time ranges can be specified using the syntax `<start>-<end>`,
-or using `*` for every possible value. A sequence (either range or star)
-can be suffixed with `/<step>` to specify an increment.
-For instance, `minute */5` means every five minutes and `minute 15-30/2`
-means every two minutes between quarter past and half past.
-
-In addition to numeric values, the keywords `dayofweek` and `month` allow
-specifying 3 letter, uppercase week day and moth names such as `MON`, `TUE`,
-etc and `JAN`, `FEB`, ...
-
-The job is only run when all specified conditions are met. Omitting a field
-is the same as specifying `*`.
-
-## Named Intervals
-
-Alternatively to the above, the keyword `interval` can be used. The following
-intervals can be specified:
-
- * `yearly` or `annually` means on every January the first at midnight.
- * `monthly` means on every first of the month at midnight.
- * `weekly` means every Sunday at midnight.
- * `daily` means every day at midnight.
- * `hourly` means every first minute of the hour.
-
-## Command Specification
-
-To specify *what* should be done once the condition is met, the following
-keywords can be used:
-
- * `exec` - the command to run. Multiple commands can be grouped
-   using curly braces.
- * `user` - a user name or ID to set before running the commands.
- * `group` - a group name or ID to set before running the commands.
- * `tty` - similar to init service files, the controlling tty or output file
-   for the batch commands. Like init service files, the `truncate` keyword
-   can be used.