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init: add disable feature to tiny-cloud

Some VPS providers provide cloud-init files (meta-data, user-data) on
/dev/sr0, which overwrite existing .apkovl.tar.gz configuration.

Creating a blank (/etc/tiny-cloud-init.disabled) file in the
.apkovl.tar.gz ensures that tiny-cloud is not loaded.

ref: https://gitlab.alpinelinux.org/alpine/mkinitfs/-/merge_requests/133

--- a/initramfs-init.in

+++ b/initramfs-init.in

@@ -698,7 +698,7 @@

 		rc_add sshd default

 	fi

-	if findfs LABEL=cidata >/dev/null 2>&1 || findfs LABEL=CIDATA >/dev/null 2>&1; then

+	if ! [ -f "$sysroot/etc/tiny-cloud.disabled" ] && (findfs LABEL=cidata >/dev/null 2>&1 || findfs LABEL=CIDATA >/dev/null 2>&1); then

 		pkgs="$pkgs tiny-cloud-alpine ifupdown-ng"

 		rc_add tiny-cloud-boot boot

 		rc_add tiny-cloud-early default

--- a/tests/initramfs-init.test

+++ b/tests/initramfs-init.test

@@ -11,7 +11,8 @@

 	initramfs_init_tmpfs_root_console_serial \

 	initramfs_init_tmpfs_root_autodetect_serial \

 	initramfs_init_tmpfs_root_remount_opts \

-	initramfs_init_tmpfs_root_tiny_cloud

+	initramfs_init_tmpfs_root_tiny_cloud \

+	initramfs_init_tmpfs_root_tiny_cloud_disabled

 fake_cmdline() {

 	mkdir -p proc

@@ -209,5 +210,24 @@

 	atf_check \

 		-o not-empty \

 		find sysroot/ -name '*tiny-cloud*'

+}

+

+initramfs_init_tmpfs_root_tiny_cloud_disabled_body() {

+	fake_cmdline ""

+	fake_switch_root

+	fake_sysroot_init

+	fake_bin findfs <<-EOF

+		#!/bin/sh

+		true

+	EOF

+

+	mkdir -p sysroot/etc

+	touch sysroot/etc/tiny-cloud.disabled

+

+	atf_check \

+		-o ignore \

+		initramfs-init

+	atf_check \

+		find sysroot/etc/runlevels -name '*tiny-cloud*'

 }