openwrt modify the default hostname

The default host name of openwrt is [OpenWrt]. Modify the default host name by modifying the source code.
Applicable version openwrt v19.07.4

• Check etc/config/system, default hostname=OpenWrt

root@Eric:/# cat etc/config/system

config system
        option hostname 'OpenWrt'
        option timezone 'UTC'
        option ttylogin '0'
        option log_size '64'
        option urandom_seed '0'

• Modify the source code [package/base-files/files/bin/config_generate], replace "OpenWrt" with "Eric"

generate_static_system() {
    
    
	# eric++
	# set system.@system[-1].hostname='OpenWrt'
	uci -q batch <<-EOF
		delete system.@system[0]
		add system system
		set system.@system[-1].hostname='Eric'
		set system.@system[-1].timezone='UTC'
		set system.@system[-1].ttylogin='0'
		set system.@system[-1].log_size='64'
		set system.@system[-1].urandom_seed='0'

		delete system.ntp
		set system.ntp='timeserver'
		set system.ntp.enabled='1'
		set system.ntp.enable_server='0'
		add_list system.ntp.server='0.openwrt.pool.ntp.org'
		add_list system.ntp.server='1.openwrt.pool.ntp.org'
		add_list system.ntp.server='2.openwrt.pool.ntp.org'
		add_list system.ntp.server='3.openwrt.pool.ntp.org'
	EOF

• After compiling and downloading, check the system again

root@Eric:/# cat etc/config/system

config system
        option hostname 'Eric'
        option timezone 'UTC'
        option ttylogin '0'
        option log_size '64'
        option urandom_seed '0'

• View hostname file

root@Eric:/proc/sys/kernel# cat hostname
Eric

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