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