Openwrt /lib/functions/procd.sh脚本

Openwrt /lib/functions/procd.sh脚本是在/sbin/procd进程启动后，将会对hotplug实现进行监听，当有hotplug的event时，将会使用hotplug.json，执行/etc/hotplug.d/下与event对应的脚本文件

[root@PandoraBox:/lib/functions]#cat /lib/functions/procd.sh
# procd API:
#
# procd_open_service(name, [script]):
#   Initialize a new procd command message containing a service with one or more instances
#
# procd_close_service()
#   Send the command message for the service
#
# procd_open_instance([name]):
#   Add an instance to the service described by the previous procd_open_service call
#
# procd_set_param(type, [value...])
#   Available types:
#     command: command line (array).
#     respawn info: array with 3 values $restart_timeout $fail_hreshold $max_fail
#     env: environment variable (passed to the process)
#     data: arbitrary name/value pairs for detecting config changes (table)
#     file: configuration files (array)
#     netdev: bound network device (detects ifindex changes)
#     limits: resource limits (passed to the process)
#     user info: array with 1 values $username
#
#   No space separation is done for arrays/tables - use one function argument per command line argument
#
# procd_close_instance():
#   Complete the instance being prepared
#
# procd_kill(service, [instance]):
#   Kill a service instance (or all instances)
#

. $IPKG_INSTROOT/usr/share/libubox/jshn.sh

_PROCD_SERVICE=

_procd_call() {
local old_cb

json_set_namespace procd old_cb
"$@"
json_set_namespace $old_cb
}

_procd_wrapper() {
while [ -n "$1" ]; do
eval "$1() { _procd_call _$1 \"\$@\"; }"
shift
done
}

_procd_ubus_call() {
local cmd="$1"

[ -n "$PROCD_DEBUG" ] && json_dump >&2
ubus call service "$cmd" "$(json_dump)"
json_cleanup
}

_procd_open_service() {
local name="$1"
local script="$2"

_PROCD_SERVICE="$name"
_PROCD_INSTANCE_SEQ=0

json_init
json_add_string name "$name"
[ -n "$script" ] && json_add_string script "$script"
json_add_object instances
}

_procd_close_service() {
json_close_object
service_triggers
_procd_ubus_call set
}

_procd_add_array_data() {
while [ "$#" -gt 0 ]; do
json_add_string "" "$1"
shift
done
}

_procd_add_array() {
json_add_array "$1"
shift
_procd_add_array_data "$@"
json_close_array
}

_procd_add_table_data() {
while [ -n "$1" ]; do
local var="${1%%=*}"
local val="${1#*=}"
[ "$1" = "$val" ] && val=
json_add_string "$var" "$val"
shift
done
}

_procd_add_table() {
json_add_object "$1"
shift
_procd_add_table_data "$@"
json_close_object
}

_procd_open_instance() {
local name="$1"; shift

_PROCD_INSTANCE_SEQ="$(($_PROCD_INSTANCE_SEQ + 1))"
name="${name:-instance$_PROCD_INSTANCE_SEQ}"
json_add_object "$name"
[ -n "$TRACE_SYSCALLS" ] && json_add_boolean trace "1"
}

_procd_open_trigger() {
json_add_array "triggers"
}

_procd_open_validate() {
json_add_array "validate"
}

_procd_add_jail() {
json_add_object "jail"
json_add_string name "$1"
json_add_string root "/tmp/.jail/$1"

shift

for a in $@; do
case $a in
log)    json_add_boolean "log" "1";;
ubus)   json_add_boolean "ubus" "1";;
procfs) json_add_boolean "procfs" "1";;
sysfs)  json_add_boolean "sysfs" "1";;
esac
done
json_add_object "mount"
json_close_object
json_close_object
}

_procd_add_jail_mount() {
local _json_no_warning=1

json_select "jail"
[ $? = 0 ] || return
json_select "mount"
[ $? = 0 ] || {
json_select ..
return
}
for a in $@; do
json_add_string "$a" "0"
done
json_select ..
json_select ..
}

_procd_add_jail_mount_rw() {
local _json_no_warning=1

json_select "jail"
[ $? = 0 ] || return
json_select "mount"
[ $? = 0 ] || {
json_select ..
return
}
for a in $@; do
json_add_string "$a" "1"
done
json_select ..
json_select ..
}

_procd_set_param() {
local type="$1"; shift

case "$type" in
env|data|limits)
_procd_add_table "$type" "$@"
;;
command|netdev|file|respawn|watch)
_procd_add_array "$type" "$@"
;;
error)
json_add_array "$type"
json_add_string "" "$@"
json_close_array
;;
nice)
json_add_int "$type" "$1"
;;
user|seccomp)
json_add_string "$type" "$1"
;;
stdout|stderr)
json_add_boolean "$type" "$1"
;;
esac
}

_procd_add_interface_trigger() {
json_add_array
_procd_add_array_data "$1"
shift

json_add_array
_procd_add_array_data "if"

json_add_array
_procd_add_array_data "eq" "interface" "$1"
shift
json_close_array

json_add_array
_procd_add_array_data "run_script" "$@"
json_close_array

json_close_array

json_close_array
}

_procd_add_reload_interface_trigger() {
local script=$(readlink "$initscript")
local name=$(basename ${script:-$initscript})

_procd_open_trigger
_procd_add_interface_trigger "interface.*" $1 /etc/init.d/$name reload
_procd_close_trigger
}

_procd_add_config_trigger() {
json_add_array
_procd_add_array_data "$1"
shift

json_add_array
_procd_add_array_data "if"

json_add_array
_procd_add_array_data "eq" "package" "$1"
shift
json_close_array

json_add_array
_procd_add_array_data "run_script" "$@"
json_close_array

json_close_array

json_close_array
}

_procd_add_raw_trigger() {
json_add_array
_procd_add_array_data "$1"
shift
local timeout=$1
shift

json_add_array
json_add_array
_procd_add_array_data "run_script" "$@"
json_close_array
json_close_array

json_add_int "" "$timeout"

json_close_array
}

_procd_add_reload_trigger() {
local script=$(readlink "$initscript")
local name=$(basename ${script:-$initscript})
local file

_procd_open_trigger
for file in "$@"; do
_procd_add_config_trigger "config.change" "$file" /etc/init.d/$name reload
done
_procd_close_trigger
}

_procd_add_validation() {
_procd_open_validate
$@
_procd_close_validate
}

_procd_append_param() {
local type="$1"; shift
local _json_no_warning=1

json_select "$type"
[ $? = 0 ] || {
_procd_set_param "$type" "$@"
return
}
case "$type" in
env|data|limits)
_procd_add_table_data "$@"
;;
command|netdev|file|respawn|watch)
_procd_add_array_data "$@"
;;
error)
json_add_string "" "$@"
;;
esac
json_select ..
}

_procd_close_instance() {
json_close_object
}

_procd_close_trigger() {
json_close_array
}

_procd_close_validate() {
json_close_array
}

_procd_add_instance() {
_procd_open_instance
_procd_set_param command "$@"
_procd_close_instance
}

_procd_kill() {
local service="$1"
local instance="$2"

json_init
[ -n "$service" ] && json_add_string name "$service"
[ -n "$instance" ] && json_add_string instance "$instance"
_procd_ubus_call delete
}

procd_open_data() {
local name="$1"
json_set_namespace procd __procd_old_cb
json_add_object data
}

procd_close_data() {
json_close_object
json_set_namespace $__procd_old_cb
}

_procd_set_config_changed() {
local package="$1"

json_init
json_add_string type config.change
json_add_object data
json_add_string package "$package"
json_close_object

ubus call service event "$(json_dump)"
}

procd_add_mdns_service() {
local service proto port
service=$1; shift
proto=$1; shift
port=$1; shift
json_add_object "${service}_$port"
json_add_string "service" "_$service._$proto.local"
json_add_int port "$port"
[ -n "$1" ] && {
json_add_array txt
for txt in $@; do json_add_string "" $txt; done
json_select ..
}
json_select ..
}

procd_add_mdns() {
procd_open_data
json_add_object "mdns"
procd_add_mdns_service $@
json_close_object
procd_close_data
}

uci_validate_section()
{
local _package="$1"
local _type="$2"
local _name="$3"
local _result
local _error
shift; shift; shift
_result=`/sbin/validate_data "$_package" "$_type" "$_name" "$@" 2> /dev/null`
_error=$?
eval "$_result"
[ "$_error" = "0" ] || `/sbin/validate_data "$_package" "$_type" "$_name" "$@" 1> /dev/null`
return $_error
}

_procd_wrapper \
procd_open_service \
procd_close_service \
procd_add_instance \
procd_add_raw_trigger \
procd_add_config_trigger \
procd_add_interface_trigger \
procd_add_reload_trigger \
procd_add_reload_interface_trigger \
procd_open_trigger \
procd_close_trigger \
procd_open_instance \
procd_close_instance \
procd_open_validate \
procd_close_validate \
procd_add_jail \
procd_add_jail_mount \
procd_add_jail_mount_rw \
procd_set_param \
procd_append_param \
procd_add_validation \
procd_set_config_changed \
procd_kill