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+SUMMARY = "Versatile implementation of the Network Time Protocol"
+DESCRIPTION = "Chrony can synchronize the system clock with NTP \
+servers, reference clocks (e.g. GPS receiver), and manual input using \
+wristwatch and keyboard. It can also operate as an NTPv4 (RFC 5905) \
+server and peer to provide a time service to other computers in the \
+network. \
+\
+It is designed to perform well in a wide range of conditions, \
+including intermittent network connections, heavily congested \
+networks, changing temperatures (ordinary computer clocks are \
+sensitive to temperature), and systems that do not run continuously, or \
+run on a virtual machine. \
+\
+Typical accuracy between two machines on a LAN is in tens, or a few \
+hundreds, of microseconds; over the Internet, accuracy is typically \
+within a few milliseconds. With a good hardware reference clock \
+sub-microsecond accuracy is possible. \
+\
+Two programs are included in chrony: chronyd is a daemon that can be \
+started at boot time and chronyc is a command-line interface program \
+which can be used to monitor chronyd's performance and to change \
+various operating parameters whilst it is running. \
+\
+This recipe produces two binary packages: 'chrony' which contains chronyd, \
+the configuration file and the init script, and 'chronyc' which contains \
+the client program only."
+
+HOMEPAGE = "https://chrony.tuxfamily.org/"
+SECTION = "net"
+LICENSE = "GPL-2.0-only"
+LIC_FILES_CHKSUM = "file://COPYING;md5=751419260aa954499f7abaabaa882bbe"
+
+SRC_URI = "https://download.tuxfamily.org/chrony/chrony-${PV}.tar.gz \
+    file://chrony.conf \
+    file://chronyd \
+    file://arm_eabi.patch \
+"
+
+SRC_URI:append:libc-musl = " \
+    file://0001-Fix-compilation-with-musl.patch \
+"
+SRC_URI[sha256sum] = "9d0da889a865f089a5a21610ffb6713e3c9438ce303a63b49c2fb6eaff5b8804"
+
+DEPENDS = "pps-tools"
+
+# Note: Despite being built via './configure; make; make install',
+#       chrony does not use GNU Autotools.
+inherit update-rc.d systemd
+
+# Add chronyd user if privdrop packageconfig is selected
+inherit ${@bb.utils.contains('PACKAGECONFIG', 'privdrop', 'useradd', '', d)}
+USERADD_PACKAGES = "${@bb.utils.contains('PACKAGECONFIG', 'privdrop', '${PN}', '', d)}"
+USERADD_PARAM:${PN} += "${@bb.utils.contains('PACKAGECONFIG', 'privdrop', '--system -d / -M --shell /bin/nologin chronyd;', '', d)}"
+
+# Configuration options:
+# - For command line editing support in chronyc, you may specify either
+#   'editline' or 'readline' but not both.  editline is smaller, but
+#   many systems already have readline for other purposes so you might want
+#   to choose that instead.  However, beware license incompatibility
+#   since chrony is GPLv2 and readline versions after 6.0 are GPLv3+.
+#   You can of course choose neither, but if you're that tight on space
+#   consider dropping chronyc entirely (you can use it remotely with
+#   appropriate chrony.conf options).
+# - Security-related:
+#   - 'sechash' is omitted by default because it pulls in nss which is huge.
+#   - 'privdrop' allows chronyd to run as non-root; would need changes to
+#     chrony.conf and init script.
+#   - 'scfilter' enables support for system call filtering, but requires the
+#     kernel to have CONFIG_SECCOMP enabled.
+PACKAGECONFIG ??= "editline \
+    ${@bb.utils.filter('DISTRO_FEATURES', 'ipv6', d)} \
+"
+PACKAGECONFIG[readline] = "--without-editline,--without-readline,readline"
+PACKAGECONFIG[editline] = ",--without-editline,libedit"
+PACKAGECONFIG[sechash] = "--without-tomcrypt,--disable-sechash,nss"
+PACKAGECONFIG[privdrop] = "--with-libcap,--disable-privdrop --without-libcap,libcap"
+PACKAGECONFIG[scfilter] = "--enable-scfilter,--without-seccomp,libseccomp"
+PACKAGECONFIG[ipv6] = ",--disable-ipv6,"
+PACKAGECONFIG[nss] = "--with-nss,--without-nss,nss"
+PACKAGECONFIG[libcap] = "--with-libcap,--without-libcap,libcap"
+
+# --disable-static isn't supported by chrony's configure script.
+DISABLE_STATIC = ""
+
+do_configure() {
+    ./configure --sysconfdir=${sysconfdir} --bindir=${bindir} --sbindir=${sbindir} \
+                --localstatedir=${localstatedir} --datarootdir=${datadir} \
+                --with-ntp-era=$(shell date -d '1970-01-01 00:00:00+00:00' +'%s') \
+                --with-pidfile=/run/chrony/chronyd.pid \
+                --chronyrundir=/run/chrony \
+                --host-system=Linux \
+                ${PACKAGECONFIG_CONFARGS}
+}
+
+do_install() {
+    # Binaries
+    install -d ${D}${bindir}
+    install -m 0755 ${S}/chronyc ${D}${bindir}
+    install -d ${D}${sbindir}
+    install -m 0755 ${S}/chronyd ${D}${sbindir}
+
+    # Config file
+    install -d ${D}${sysconfdir}
+    install -m 644 ${WORKDIR}/chrony.conf ${D}${sysconfdir}
+    if ${@bb.utils.contains('PACKAGECONFIG', 'privdrop', 'true', 'false', d)}; then
+        echo "# Define user to drop to after dropping root privileges" >> ${D}${sysconfdir}/chrony.conf
+        echo "user chronyd" >> ${D}${sysconfdir}/chrony.conf
+    fi
+
+    # System V init script
+    install -d ${D}${sysconfdir}/init.d
+    install -m 755 ${WORKDIR}/chronyd ${D}${sysconfdir}/init.d
+
+    # systemd unit configuration file
+    install -d ${D}${systemd_unitdir}/system
+    install -m 0644 ${S}/examples/chronyd.service ${D}${systemd_unitdir}/system/
+
+    # Variable data (for drift and/or rtc file)
+    install -d ${D}${localstatedir}/lib/chrony
+
+    # Fix hard-coded paths in config files and init scripts
+    sed -i -e 's!/var/!${localstatedir}/!g' -e 's!/etc/!${sysconfdir}/!g' \
+           -e 's!/usr/sbin/!${sbindir}/!g' -e 's!/usr/bin/!${bindir}/!g' \
+           ${D}${sysconfdir}/chrony.conf \
+           ${D}${sysconfdir}/init.d/chronyd \
+           ${D}${systemd_unitdir}/system/chronyd.service
+    sed -i 's!^PATH=.*!PATH=${base_sbindir}:${base_bindir}:${sbindir}:${bindir}!' ${D}${sysconfdir}/init.d/chronyd
+    sed -i 's!^EnvironmentFile=.*!EnvironmentFile=-${sysconfdir}/default/chronyd!' ${D}${systemd_unitdir}/system/chronyd.service
+
+    install -d ${D}${sysconfdir}/tmpfiles.d
+    echo "d /var/lib/chrony 0755 root root -" > ${D}${sysconfdir}/tmpfiles.d/chronyd.conf
+
+}
+
+FILES:${PN} = "${sbindir}/chronyd ${sysconfdir} ${localstatedir}/lib/chrony ${localstatedir}"
+CONFFILES:${PN} = "${sysconfdir}/chrony.conf"
+INITSCRIPT_NAME = "chronyd"
+INITSCRIPT_PARAMS = "defaults"
+SYSTEMD_PACKAGES = "${PN}"
+SYSTEMD_SERVICE:${PN} = "chronyd.service"
+
+# It's probably a bad idea to run chrony and another time daemon on
+# the same system.  systemd includes the SNTP client 'timesyncd', which
+# will be disabled by chronyd.service, however it will remain on the rootfs
+# wasting 150 kB unless you put 'PACKAGECONFIG:remove:pn-systemd = "timesyncd"'
+# in a conf file or bbappend somewhere.
+RCONFLICTS:${PN} = "ntp ntimed"
+
+# Separate the client program into its own package
+PACKAGES =+ "chronyc"
+FILES:chronyc = "${bindir}/chronyc"