eclass/mount-boot-utils: Add from Gentoo

It's from Gentoo commit e598ba3fe1f5b51c0f0e64cacd950d600b289852.

sdk_container/src/third_party/portage-stable/eclass/mount-boot-utils.eclass

@@ -0,0 +1,109 @@
+# Copyright 1999-2024 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+# @ECLASS: mount-boot-utils.eclass
+# @MAINTAINER:
+# base-system@gentoo.org
+# @SUPPORTED_EAPIS: 6 7 8
+# @BLURB: functions for packages that install files into /boot or the ESP
+# @DESCRIPTION:
+# This eclass is really only useful for bootloaders and kernel installation.
+#
+# If the live system has a separate /boot partition or ESP configured, then this
+# function tries to ensure that it's mounted in rw mode, exiting with an error
+# if it can't.  It does nothing if /boot and ESP isn't a separate partition.
+#
+# This eclass provides the functions used by mount-boot.eclass in an "inherit-
+# safe" way. This allows these functions to be used in other eclasses cleanly.
+
+case ${EAPI} in
+	7|8) ;;
+	*) die "${ECLASS}: EAPI ${EAPI:-0} not supported" ;;
+esac
+
+# @FUNCTION: mount-boot_is_disabled
+# @INTERNAL
+# @DESCRIPTION:
+# Detect whether the current environment/build settings are such that we do not
+# want to mess with any mounts.
+mount-boot_is_disabled() {
+	# Since this eclass only deals with /boot, skip things when EROOT is active.
+	if [[ -n ${EROOT} ]]; then
+		return 0
+	fi
+
+	# If we're only building a package, then there's no need to check things.
+	if [[ ${MERGE_TYPE} == buildonly ]]; then
+		return 0
+	fi
+
+	# The user wants us to leave things be.
+	if [[ -n ${DONT_MOUNT_BOOT} ]]; then
+		return 0
+	fi
+
+	# OK, we want to handle things ourselves.
+	return 1
+}
+
+# @FUNCTION: mount-boot_check_status
+# @INTERNAL
+# @DESCRIPTION:
+# Check if /boot and ESP is sane, i.e., mounted as read-write if on a separate
+# partition.  Die if conditions are not fulfilled.  If nonfatal is used,
+# the function will return a non-zero status instead.
+mount-boot_check_status() {
+	# Get out fast if possible.
+	mount-boot_is_disabled && return 0
+
+	local partition=
+	local part_is_not_mounted=
+	local part_is_read_only=
+	local candidates=( /boot )
+
+	# If system is booted with UEFI, check for ESP as well
+	if [[ -d /sys/firmware/efi ]]; then
+		# Use same candidates for ESP as installkernel and eclean-kernel
+		candidates+=( /efi /boot/efi /boot/EFI )
+	fi
+
+	for partition in ${candidates[@]}; do
+		# note that /dev/BOOT is in the Gentoo default /etc/fstab file
+		local fstabstate=$(awk "!/^[[:blank:]]*#|^\/dev\/BOOT/ && \$2 == \"${partition}\" \
+			{ print 1; exit }" /etc/fstab || die "awk failed")
+
+		if [[ -z ${fstabstate} ]]; then
+			einfo "Assuming you do not have a separate ${partition} partition."
+		else
+			local procstate=$(awk "\$2 == \"${partition}\" { split(\$4, a, \",\"); \
+				for (i in a) if (a[i] ~ /^r[ow]\$/) { print a[i]; break }; exit }" \
+				/proc/mounts || die "awk failed")
+
+			if [[ -z ${procstate} ]]; then
+				eerror "Your ${partition} partition is not mounted"
+				eerror "Please mount it and retry."
+				die -n "${partition} not mounted"
+				part_is_not_mounted=1
+			else
+				if [[ ${procstate} == ro ]]; then
+					eerror "Your ${partition} partition, was detected as being mounted," \
+						"but is mounted read-only."
+					eerror "Please remount it as read-write and retry."
+					die -n "${partition} mounted read-only"
+					part_is_read_only=1
+				else
+					einfo "Your ${partition} partition was detected as being mounted."
+					einfo "Files will be installed there for ${PN} to function correctly."
+				fi
+			fi
+		fi
+	done
+
+	if [[ -n ${part_is_not_mounted} ]]; then
+		return 1
+	elif [[ -n ${part_is_read_only} ]]; then
+		return 2
+	else
+		return 0
+	fi
+}