eclass/acct-group: Sync with gentoo

It's from gentoo commit 84b3ffe79a9699b2246adfcfda74f39c1b577651.

sdk_container/src/third_party/portage-stable/eclass/acct-group.eclass

@@ -1,4 +1,4 @@
-# Copyright 2019 Gentoo Authors
+# Copyright 2019-2021 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 # @ECLASS: acct-group.eclass
@@ -7,7 +7,7 @@
 # @AUTHOR:
 # Michael Orlitzky <mjo@gentoo.org>
 # Michał Górny <mgorny@gentoo.org>
-# @SUPPORTED_EAPIS: 7
+# @SUPPORTED_EAPIS: 7 8
 # @BLURB: Eclass used to create and maintain a single group entry
 # @DESCRIPTION:
 # This eclass represents and creates a single group entry.  The name
@@ -20,22 +20,23 @@
 # and add an ebuild with the following contents:
 #
 # @CODE
-# EAPI=7
+# EAPI=8
 # inherit acct-group
 # ACCT_GROUP_ID=200
 # @CODE
 #
-# Then you add appropriate dependency to your package.  The dependency
+# Then you add appropriate dependencies to your package.  Note that
-# type(s) should be:
+# the build system might need to resolve names, too.  The dependency
-# - DEPEND (+ RDEPEND) if the group is already needed at build time,
+# type(s) should be: BDEPEND if the group must be resolvable at build
-# - RDEPEND if it is needed at install time (e.g. you 'fowners' files
+# time (e.g. 'fowners' uses it in src_install), IDEPEND if it must be
-#   in pkg_preinst) or run time.
+# resolvable at install time (e.g. 'fowners' uses it in pkg_preinst),
+# and RDEPEND in every case.
 
 if [[ -z ${_ACCT_GROUP_ECLASS} ]]; then
 _ACCT_GROUP_ECLASS=1
 
 case ${EAPI:-0} in
-	7) ;;
+	7|8) ;;
 	*) die "EAPI=${EAPI:-0} not supported";;
 esac
 
@@ -59,7 +60,8 @@ readonly ACCT_GROUP_NAME
 # @REQUIRED
 # @DESCRIPTION:
 # Preferred GID for the new group.  This variable is obligatory, and its
-# value must be unique across all group packages.
+# value must be unique across all group packages.  This can be overriden
+# in make.conf through ACCT_GROUP_<UPPERCASE_USERNAME>_ID variable.
 #
 # Overlays should set this to -1 to dynamically allocate GID.  Using -1
 # in ::gentoo is prohibited by policy.
@@ -75,12 +77,12 @@ readonly ACCT_GROUP_NAME
 # << Boilerplate ebuild variables >>
 : ${DESCRIPTION:="System group: ${ACCT_GROUP_NAME}"}
 : ${SLOT:=0}
-: ${KEYWORDS:=alpha amd64 arm arm64 hppa ia64 m68k ~mips ppc ppc64 ~riscv s390 sh sparc x86 ~ppc-aix ~x64-cygwin ~amd64-linux ~x86-linux ~ppc-macos ~x64-macos ~x86-macos ~m68k-mint ~sparc-solaris ~sparc64-solaris ~x64-solaris ~x86-solaris}
+: ${KEYWORDS:=alpha amd64 arm arm64 hppa ia64 m68k ~mips ppc ppc64 ~riscv s390 sparc x86 ~x64-cygwin ~amd64-linux ~x86-linux ~ppc-macos ~x64-macos ~sparc-solaris ~sparc64-solaris ~x64-solaris ~x86-solaris}
 S=${WORKDIR}
 
 
 # << Phase functions >>
-EXPORT_FUNCTIONS pkg_pretend pkg_preinst
+EXPORT_FUNCTIONS pkg_pretend src_install pkg_preinst
 
 # @FUNCTION: acct-group_pkg_pretend
 # @DESCRIPTION:
@@ -91,31 +93,63 @@ acct-group_pkg_pretend() {
 
 	# verify ACCT_GROUP_ID
 	[[ -n ${ACCT_GROUP_ID} ]] || die "Ebuild error: ACCT_GROUP_ID must be set!"
-	[[ ${ACCT_GROUP_ID} -eq -1 ]] && return
+	[[ ${ACCT_GROUP_ID} -ge -1 ]] || die "Ebuild error: ACCT_GROUP_ID=${ACCT_GROUP_ID} invalid!"
-	[[ ${ACCT_GROUP_ID} -ge 0 ]] || die "Ebuild errors: ACCT_GROUP_ID=${ACCT_GROUP_ID} invalid!"
+	local group_id=${ACCT_GROUP_ID}
+
+	# check for the override
+	local override_name=${ACCT_GROUP_NAME^^}
+	local override_var=ACCT_GROUP_${override_name//-/_}_ID
+	if [[ -n ${!override_var} ]]; then
+		group_id=${!override_var}
+		[[ ${group_id} -ge -1 ]] || die "${override_var}=${group_id} invalid!"
+	fi
 
 	# check for ACCT_GROUP_ID collisions early
-	if [[ -n ${ACCT_GROUP_ENFORCE_ID} ]]; then
+	if [[ ${group_id} -ne -1 && -n ${ACCT_GROUP_ENFORCE_ID} ]]; then
-		local group_by_id=$(egetgroupname "${ACCT_GROUP_ID}")
+		local group_by_id=$(egetgroupname "${group_id}")
 		local group_by_name=$(egetent group "${ACCT_GROUP_NAME}")
 		if [[ -n ${group_by_id} ]]; then
 			if [[ ${group_by_id} != ${ACCT_GROUP_NAME} ]]; then
 				eerror "The required GID is already taken by another group."
-				eerror "  GID: ${ACCT_GROUP_ID}"
+				eerror "  GID: ${group_id}"
 				eerror "  needed for: ${ACCT_GROUP_NAME}"
 				eerror "  current group: ${group_by_id}"
-				die "GID ${ACCT_GROUP_ID} taken already"
+				die "GID ${group_id} taken already"
 			fi
 		elif [[ -n ${group_by_name} ]]; then
 			eerror "The requested group exists already with wrong GID."
 			eerror "  groupname: ${ACCT_GROUP_NAME}"
-			eerror "  requested GID: ${ACCT_GROUP_ID}"
+			eerror "  requested GID: ${group_id}"
 			eerror "  current entry: ${group_by_name}"
 			die "Group ${ACCT_GROUP_NAME} exists with wrong GID"
 		fi
 	fi
 }
 
+# @FUNCTION: acct-group_src_install
+# @DESCRIPTION:
+# Installs sysusers.d file for the group.
+acct-group_src_install() {
+	debug-print-function ${FUNCNAME} "${@}"
+
+	# check for the override
+	local override_name=${ACCT_GROUP_NAME^^}
+	local override_var=ACCT_GROUP_${override_name//-/_}_ID
+	if [[ -n ${!override_var} ]]; then
+		ewarn "${override_var}=${!override_var} override in effect, support will not be provided."
+		_ACCT_GROUP_ID=${!override_var}
+	else
+		_ACCT_GROUP_ID=${ACCT_GROUP_ID}
+	fi
+
+	insinto /usr/lib/sysusers.d
+	newins - ${CATEGORY}-${ACCT_GROUP_NAME}.conf < <(
+		printf "g\t%q\t%q\n" \
+			"${ACCT_GROUP_NAME}" \
+			"${_ACCT_GROUP_ID/#-*/-}"
+	)
+}
+
 # @FUNCTION: acct-group_pkg_preinst
 # @DESCRIPTION:
 # Creates the group if it does not exist yet.
@@ -123,7 +157,7 @@ acct-group_pkg_preinst() {
 	debug-print-function ${FUNCNAME} "${@}"
 
 	enewgroup ${ACCT_GROUP_ENFORCE_ID:+-F} "${ACCT_GROUP_NAME}" \
-		"${ACCT_GROUP_ID}"
+		"${_ACCT_GROUP_ID}"
 }
 
 fi