main/chrony: add FAST_STARTUP option to OpenRC services

chronyd takes quite some time to perform a double fork to deamonize,
thereby blocking OpenRC. This is probably the case because it blocks
until time is synchronized.

When enabled the FAST_STARTUP option performs the double fork through
start-stop-daemon(1) thereby significantly reducing the startup of the
chronyd service.

main/chrony/APKBUILD

@@ -3,7 +3,7 @@
 # Maintainer: Natanael Copa <ncopa@alpinelinux.org>
 pkgname=chrony
 pkgver=3.3
-pkgrel=0
+pkgrel=1
 _ver=${pkgver/_/-}
 pkgdesc="NTP client and server programs"
 url="https://chrony.tuxfamily.org"
@@ -84,8 +84,8 @@ package() {
 sha512sums="36975d863599141e8e5b071d35cf67326b27f5b0da7ec942dbb4530377d10472b0729eea632e0702718b515cb2d5fd41a7eba158e6dade7f05adfb1bdffa5df0  chrony-3.3.tar.gz
 067d47224a8c075ec8f63ffc58e65b030fdf228a72c4f03d50a2f2c17414da65bb5d27c7c2e4ba99e909f452041db83eaebe3c9e34c0c8fce18e05ebb489735e  fix-tests.patch
 b26581ed32680585edea5b8163a0062a87f648394c0f363c77a7d01a36608fcf4d005d9e6ab179ed2827b8a08f598f7bad4801bb5e135cad5107eb77fb19b247  max_resolve_interval.patch
-6919c7bddce2a8f81c0f2759c7c58506e97f89102bfeb7b5c19c6da5ed4cbd9070faddd4f3fb411bb4c653fffbdcc93a7f7dc810f38b199f038b1d4072f57640  chronyd.confd
-9a18c9744d7b78d9b9be3f0ae0b43cb988b294c342764802e0d5df835d450e748584c0b345f7161f14d84e15c8bbd491514ee9dc45e4a65f1276c52124d2e312  chronyd.initd
+0490770cc214b4ccf76470420e0b33e6c41ad16344d6503973a28346b002e2cee441e9ae982be1a8f21696da26f436f2ce36a5201e9628becb83bad3487d9170  chronyd.confd
+6139e6464986b82d8c20aee1cda337eae851c318d9f3fe9aee15dc48f2165f9f68ce2e22dcd8018b8fb4e0e1934990c5351e1c3a02d79005e1a1acd8cd02dc0a  chronyd.initd
 ab38f06bf45888846778ad935e24abb30d13b6805e9a750bc694ff953695fa8c5b33aac560f5f7f96dc46031c1a38660e5c418b6fce6fb34a87908a9a3c99357  chrony.logrotate
 0ae453fca3461b6e56a32a9eb6be0d448c39bf0279583222ab2fecef307e1113f082d4e86f957e4baac4f223c5c57804cdea97322678009f3413ab99d54694b6  chrony.conf
 eb11fc19243d1789016d88eb7645bfe67c46304547781489bf36eb1dd4c252d523681ff835a6488fa0ef62b6b9e2f781c672279f4439f5d5640a3f214a113048  timepps.h"

main/chrony/chronyd.confd

@@ -2,6 +2,11 @@
 
 CFGFILE="/etc/chrony/chrony.conf"
 
+# chronyd takes some time to perform a second fork, by enabling this
+# option chronyd is deamonized through start-stop-daemon(1) thereby
+# significantly reducing the startup time.
+FAST_STARTUP=no
+
 # Configuration dependant options :
 #      -s - Set system time from RTC if rtcfile directive present
 #      -r - Reload sample histories if dumponexit directive present

main/chrony/chronyd.initd

@@ -51,8 +51,14 @@ start() {
 
 	[ -n "${PIDFILE}" ] || PIDFILE=/var/run/chronyd.pid
 
+	local daemon_args=
+	if yesno "$FAST_STARTUP"; then
+		ARGS="${ARGS} -n"
+		daemon_args="--background"
+	fi
+
 	ebegin "Starting chronyd"
-	start-stop-daemon --start --quiet \
+	start-stop-daemon $daemon_args --start --quiet \
 		--exec /usr/sbin/chronyd \
 		--pidfile "${PIDFILE}" \
 		-- -f "${CFGFILE}" ${ARGS}