procd: update to git HEAD and add new script helpers

 e10de28 jail: cgroups-bpf: fix compile with musl 1.2
 f5d9b14 hotplug-dispatch: fix rare memory leaks in error paths

Add new init script helpers:
 procd_add_start_mount_trigger
 procd_add_reload_mount_trigger
 procd_get_mountpoints

Both trigger helpers expect a list of paths which are checked against
the mount targets configured in /etc/config/fstab and a trigger for all
mountpoints covered by the list of paths is setup.

procd_get_mountpoints is useful to find out if and which mountpoints
are covered by a list of paths.

Example:
  DATADIRS="/mnt/data/foo /mnt/data/bar /etc/foo/baz /var/lib/doe"

  start_service() {
    [ "$_BOOT" = "1" ] &&
      [ "$(procd_get_mountpoints $DATADIRS)" ] && return 0

    procd_open_instance
    # ...
    procd_close_instance
  }

  boot() {
    _BOOT=1 start
  }

  service_triggers() {
    procd_add_start_mount_trigger $DATADIRS
  }

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

1 files changed, 75 insertions, 0 deletions

diff --git a/package/system/procd/files/procd.sh b/package/system/procd/files/procd.sh
index d86b7219da..de30c76878 100644
--- a/package/system/procd/files/procd.sh
+++ b/package/system/procd/files/procd.sh
@@ -329,6 +329,78 @@ _procd_add_config_trigger() {
 	json_close_array
 }
 
+_procd_add_mount_trigger() {
+	json_add_array
+	_procd_add_array_data "$1"
+	local action="$2"
+	local multi=0
+	shift ; shift
+
+	json_add_array
+	_procd_add_array_data "if"
+
+	if [ "$2" ]; then
+		json_add_array
+		_procd_add_array_data "or"
+		multi=1
+	fi
+
+	while [ "$1" ]; do
+		json_add_array
+		_procd_add_array_data "eq" "target" "$1"
+		shift
+		json_close_array
+	done
+
+	[ $multi = 1 ] && json_close_array
+
+	json_add_array
+	_procd_add_array_data "run_script" /etc/init.d/$name $action
+	json_close_array
+
+	json_close_array
+	_procd_add_timeout
+	json_close_array
+}
+
+_procd_add_action_mount_trigger() {
+	local script=$(readlink "$initscript")
+	local name=$(basename ${script:-$initscript})
+	local action="$1"
+	local mpath
+	shift
+
+	_procd_open_trigger
+	_procd_add_mount_trigger mount.add $action "$@"
+	_procd_close_trigger
+}
+
+procd_get_mountpoints() {
+	(
+		__procd_check_mount() {
+			local cfg="$1"
+			local path="${2%%/}/"
+			local target
+			config_get target "$cfg" target
+			target="${target%%/}/"
+			[ "$path" != "${path##$target}" ] && echo "${target%%/}"
+		}
+
+		config_load fstab
+		for mpath in "$@"; do
+			config_foreach __procd_check_mount mount "$mpath"
+		done
+	) | sort -u
+}
+
+_procd_add_start_mount_trigger() {
+	_procd_add_action_mount_trigger start $(procd_get_mountpoints "$@")
+}
+
+_procd_add_reload_mount_trigger() {
+	_procd_add_action_mount_trigger reload $(procd_get_mountpoints "$@")
+}
+
 _procd_add_raw_trigger() {
 	json_add_array
 	_procd_add_array_data "$1"
@@ -560,8 +632,11 @@ _procd_wrapper \
 	procd_add_raw_trigger \
 	procd_add_config_trigger \
 	procd_add_interface_trigger \
+	procd_add_mount_trigger \
 	procd_add_reload_trigger \
 	procd_add_reload_interface_trigger \
+	procd_add_reload_mount_trigger \
+	procd_add_start_mount_trigger \
 	procd_open_trigger \
 	procd_close_trigger \
 	procd_open_instance \