app-alternatives/awk: Add from Gentoo

It's from Gentoo commit a88b50da320f6eca75f92a5e59b1657674775d85.

sdk_container/src/third_party/portage-stable/app-alternatives/awk/awk-1.ebuild

@@ -0,0 +1,19 @@
+# Copyright 1999-2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+DESCRIPTION="Virtual for awk implementation"
+HOMEPAGE="https://wiki.gentoo.org/wiki/No_homepage"
+
+SLOT="0"
+KEYWORDS="~alpha amd64 arm arm64 hppa ~ia64 ~loong ~m68k ~mips ppc ppc64 ~riscv ~s390 sparc x86 ~x64-cygwin ~amd64-linux ~x86-linux ~ppc-macos ~x64-macos ~sparc-solaris ~sparc64-solaris ~x64-solaris ~x86-solaris"
+LICENSE="metapackage"
+
+RDEPEND="
+	|| (
+		>=sys-apps/gawk-4.0.1-r1
+		sys-apps/mawk
+		sys-apps/nawk
+		sys-apps/busybox
+	)"

sdk_container/src/third_party/portage-stable/app-alternatives/awk/awk-2.ebuild

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+# Copyright 2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+DESCRIPTION="/bin/awk and /usr/bin/awk symlinks"
+HOMEPAGE="https://wiki.gentoo.org/wiki/Project:Base/Alternatives"
+SRC_URI=""
+S=${WORKDIR}
+
+LICENSE="CC0-1.0"
+SLOT="0"
+KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~loong ~m68k ~mips ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86 ~x64-cygwin ~amd64-linux ~x86-linux ~ppc-macos ~x64-macos ~sparc-solaris ~sparc64-solaris ~x64-solaris ~x86-solaris"
+IUSE="busybox +gawk mawk nawk split-usr"
+REQUIRED_USE="^^ ( busybox gawk mawk nawk )"
+
+RDEPEND="
+	busybox? ( sys-apps/busybox )
+	gawk? ( sys-apps/gawk )
+	mawk? ( sys-apps/mawk )
+	nawk? ( sys-apps/nawk )
+	!app-eselect/eselect-awk
+"
+
+src_install() {
+	local root_prefix=
+	use split-usr && root_prefix=../../bin/
+
+	# We could consider setting AWK=... like we do for yacc & lex,
+	# but it would need some testing with a fair amount of packages first,
+	# as autoconf prefers gawk.
+	if use busybox; then
+		dosym "${root_prefix}busybox" /usr/bin/awk
+		newman - awk.1 <<<".so busybox.1"
+	elif use gawk; then
+		dosym gawk /usr/bin/awk
+		newman - awk.1 <<<".so gawk.1"
+	elif use mawk; then
+		dosym mawk /usr/bin/awk
+		newman - awk.1 <<<".so mawk.1"
+	elif use nawk; then
+		dosym nawk /usr/bin/awk
+		newman - awk.1 <<<".so nawk.1"
+	else
+		die "Invalid USE flag combination (broken REQUIRED_USE?)"
+	fi
+
+	if use split-usr; then
+		dosym ../usr/bin/awk /bin/awk
+	fi
+}
+
+pkg_postrm() {
+	# make sure we don't leave the user without the symlinks, since
+	# they've not been owned by any other package
+	if [[ ! -h ${EROOT}/usr/bin/awk ]]; then
+		ln -s gawk "${EROOT}/usr/bin/awk" || die
+	fi
+	if [[ ! -h ${EROOT}/bin/awk ]]; then
+		ln -s ../usr/bin/awk "${EROOT}/bin/awk" || die
+	fi
+}

sdk_container/src/third_party/portage-stable/app-alternatives/awk/metadata.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "https://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+	<maintainer type="person">
+		<email>junghans@gentoo.org</email>
+		<name>Christoph Junghans</name>
+	</maintainer>
+	<maintainer type="project">
+		<email>base-system@gentoo.org</email>
+		<name>Gentoo Base System</name>
+	</maintainer>
+	<maintainer type="person">
+		<email>mgorny@gentoo.org</email>
+		<name>Michał Górny</name>
+	</maintainer>
+	<use>
+		<flag name="busybox">
+			Symlink to <pkg>sys-apps/busybox</pkg>
+		</flag>
+		<flag name="gawk">
+			Symlink to <pkg>sys-apps/gawk</pkg>
+		</flag>
+		<flag name="mawk">
+			Symlink to <pkg>sys-apps/mawk</pkg> (warning: mawk is
+			not fully POSIX-compliant)
+		</flag>
+		<flag name="nawk">
+			Symlink to <pkg>sys-apps/nawk</pkg>
+		</flag>
+	</use>
+</pkgmetadata>