Add experimental support for running under runit. (#13841)

* Add basic runit service script for Netdata.

* Integrate runit handling in install-service script.

* Add new runit script to .gitignore.

* Fix service file installation.

We need to ensure the service directory actually gets created, and thus
need to use `-D` with the `install` command.

* Sync with system restructure.

* Fix botched update to Makefile.am.

3 files changed, 73 insertions, 9 deletions

diff --git a/system/Makefile.am b/system/Makefile.am
index b6efe45009..747c6d4e43 100644
--- a/system/Makefile.am
+++ b/system/Makefile.am
@@ -11,6 +11,7 @@ CLEANFILES = \
     lsb/init.d/netdata \
     openrc/conf.d/netdata \
     openrc/init.d/netdata \
+    runit/run \
     systemd/netdata.service \
     systemd/netdata.service.v235 \
     systemd/netdata-updater.service \
@@ -40,6 +41,7 @@ libsyslsbinitddir=$(libsyslsbdir)/init.d
 libsysopenrcdir=$(libsysdir)/openrc
 libsysopenrcinitddir=$(libsysopenrcdir)/init.d
 libsysopenrcconfddir=$(libsysopenrcdir)/conf.d
+libsysrunitdir=$(libsysdir)/runit
 libsyssystemddir=$(libsysdir)/systemd
 
 # Explicitly install directories to avoid permission issues due to umask
@@ -55,6 +57,7 @@ install-exec-local:
 	$(INSTALL) -d $(DESTDIR)$(libsyssystemddir)
 	$(INSTALL) -d $(DESTDIR)$(libsysopenrcinitddir)
 	$(INSTALL) -d $(DESTDIR)$(libsysopenrcconfddir)
+	$(INSTALL) -d $(DESTDIR)$(libsysrunitdir)
 	$(INSTALL) -d $(DESTDIR)$(libconfigvnodesdir)
 
 dist_libconfigvnodes_DATA = \
@@ -98,6 +101,10 @@ nodist_libsysopenrcconfd_DATA = \
     openrc/conf.d/netdata \
     $(NULL)
 
+nodist_libsysrunit_DATA = \
+    runit/run \
+    $(NULL)
+
 nodist_libsyssystemd_DATA = \
     systemd/netdata.service \
     systemd/netdata.service.v235 \
@@ -119,6 +126,7 @@ dist_noinst_DATA = \
     lsb/init.d/netdata.in \
     openrc/conf.d/netdata.in \
     openrc/init.d/netdata.in \
+    runit/run.in \
     systemd/netdata.service.in \
     systemd/netdata.service.v235.in \
     systemd/netdata-updater.service.in \
diff --git a/system/install-service.sh.in b/system/install-service.sh.in
index 3784cd1fd9..9a37528c54 100755
--- a/system/install-service.sh.in
+++ b/system/install-service.sh.in
@@ -87,7 +87,7 @@ get_os_key() {
 valid_types() {
   case "${PLATFORM}" in
     Linux)
-      echo "detect systemd openrc lsb initd"
+      echo "detect ${LINUX_INIT_TYPES}"
       ;;
     FreeBSD)
       echo "detect freebsd"
@@ -475,8 +475,6 @@ initd_cmds() {
 
 # =====================================================================
 # runit support functions
-#
-# Currently not supported, this exists to provide useful error messages.
 
 _check_runit() {
   # if there is no runsvdir command, then it's not runit
@@ -503,19 +501,61 @@ check_runit() {
 }
 
 install_runit_service() {
-  error "Detected runit, which we do not currently support."
-  exit 3
+  if [ -d /etc/sv ]; then
+    svc_dir="/etc/sv/netdata"
+  elif [ -d /etc/runit/sv ]; then
+    svc_dir="/etc/runit/sv/netdata"
+  else
+    error "Failed to locate service directory"
+    exit 4
+  fi
+
+  if [ -d /service ]; then
+    live_svc_dir="/service"
+  elif [ -d /var/service ]; then
+    live_svc_dir="/var/service"
+  elif [ -d /run/runit/service ]; then
+    live_svc_dir="/run/runit/service"
+  elif [ -d /etc/runit/runsvdir/default ]; then
+    live_svc_dir="/etc/runit/runsvdir/default"
+  else
+    error "Failed to locate live service directory"
+    exit 4
+  fi
+
+  svc_file="${svc_dir}/run"
+
+  info "Installing runit service file."
+  if [ ! -f "${svc_file}" ] && [ "${ENABLE}" = "auto" ]; then
+    ENABLE="enable"
+  fi
+
+  if ! install -D -p -m 0755 -o 0 -g 0 "${SVC_SOURCE}/runit/run" "${svc_file}"; then
+    error "Failed to install service file."
+    exit 4
+  fi
+
+  case ${ENABLE} in
+    enable)
+      if ! ln -s "${svc_dir}" "${live_svc_dir}"; then
+        warning "Failed to enable the Netdata service."
+      fi
+      ;;
+    disable)
+      if ! rm "${live_svc_dir}/netdata"; then
+        warning "Failed to disable the Netdata service."
+      fi
+      ;;
+  esac
 }
 
 runit_cmds() {
-  error "Detected runit, which we do not currently support."
-  exit 3
+  NETDATA_START_CMD="sv start netdata"
+  NETDATA_STOP_CMD="sv stop netdata"
 }
 
 # =====================================================================
 # WSL support functions
-#
-# Cannot be supported, this exists to provide useful error messages.
 
 _check_wsl() {
   # If uname -r contains the string WSL, then it's WSL.
diff --git a/system/runit/run.in b/system/runit/run.in
new file mode 100644
index 0000000000..4ea783cc6c
--- /dev/null
+++ b/system/runit/run.in
@@ -0,0 +1,16 @@
+#!/bin/sh
+
+piddir="@localstatedir_POST@/run/netdata/netdata.pid"
+pidfile="${piddir}/netdata.pid"
+
+cachedir="@localstatedir_POST@/cache/netdata"
+
+command="@sbindir_POST@/netdata"
+command_args="-P ${pidfile} -D"
+
+[ ! -d "${piddir}" ] && mkdir -p "${piddir}"
+[ ! -d "${cachedir}" ] && mkdir -p "${cachedir}"
+chown -R @netdata_user_POST@ "${piddir}"
+chown -R @netdata_user_POST@ "${cachedir}"
+
+exec ${command} ${command_args}