sys-fs/eudev: ensure REPLACING_VERSIONS is processed as a list

REPLACING_VERSIONS is used in eudev ebuilds during pkg_postinst to determine
when udevadm control --reload should be called:
- when it is a new installation of udev
- when it is a re-emerge of the same version (or a revision-only upgrade)

REPLACING_VERSIONS *should* only ever have zero or one values, but it is
theoretically possible for it to have more than that if, for instance, a previous
upgrade failed to complete during qmerge.  If this is the case, and only one of
the multiple versions match the version of the ebuild, then we also abort as we
don't know which one is the "good" one.

Also removed duplicate code that reloads the hwdb (looks like it was a copy-paste
from sys-fs/udev)

Bug: http://bugs.gentoo.org/589530

Package-Manager: portage-2.2.28

7 files changed, 182 insertions, 175 deletions

diff --git a/sys-fs/eudev/eudev-1.10-r2.ebuild b/sys-fs/eudev/eudev-1.10-r2.ebuild
index 83d33b82ec99..122087f5a115 100644
--- a/sys-fs/eudev/eudev-1.10-r2.ebuild
+++ b/sys-fs/eudev/eudev-1.10-r2.ebuild
@@ -248,22 +248,41 @@ pkg_postinst() {
 		ewarn "else losetup may be confused when looking for unused devices."
 	fi
 
+	# https://cgit.freedesktop.org/systemd/systemd/commit/rules/50-udev-default.rules?id=3dff3e00e044e2d53c76fa842b9a4759d4a50e69
+	# https://bugs.gentoo.org/246847
+	# https://bugs.gentoo.org/514174
+	enewgroup input
+
+	# REPLACING_VERSIONS should only ever have zero or 1 values but in case it doesn't,
+	# process it as a list.  We only care about the zero case (new install) or the case where
+	# the same version is being re-emerged.  If there is a second version, allow it to abort.
+	local rv rvres=doitnew
+	for rv in ${REPLACING_VERSIONS} ; do
+		if [[ ${rvres} == doit* ]]; then
+			if [[ ${rv%-r*} == ${PV} ]]; then
+				rvres=doit
+			else
+				rvres=${rv}
+			fi
+		fi
+	done
+
 	if use hwdb && has_version 'sys-apps/hwids[udev]'; then
 		udevadm hwdb --update --root="${ROOT%/}"
 
 		# https://cgit.freedesktop.org/systemd/systemd/commit/?id=1fab57c209035f7e66198343074e9cee06718bda
 		# reload database after it has be rebuilt, but only if we are not upgrading
 		# also pass if we are -9999 since who knows what hwdb related changes there might be
-		if [[ ${REPLACING_VERSIONS%-r*} == ${PV} || -z ${REPLACING_VERSIONS} ]] && \
-		[[ ${ROOT%/} == "" ]] && [[ ${PV} != "9999" ]]; then
+		if [[ ${rvres} == doit* ]] && [[ ${ROOT%/} == "" ]] && [[ ${PV} != "9999" ]]; then
 			udevadm control --reload
 		fi
 	fi
-
-	ewarn
-	ewarn "You need to restart eudev as soon as possible to make the"
-	ewarn "upgrade go into effect:"
-	ewarn "\t/etc/init.d/udev --nodeps restart"
+	if [[ ${rvres} != doitnew ]]; then
+		ewarn
+		ewarn "You need to restart eudev as soon as possible to make the"
+		ewarn "upgrade go into effect:"
+		ewarn "\t/etc/init.d/udev --nodeps restart"
+	fi
 
 	if use rule-generator && use openrc && \
 	[[ -x $(type -P rc-update) ]] && rc-update show | grep udev-postmount | grep -qsv 'boot\|default\|sysinit'; then
@@ -279,22 +298,4 @@ pkg_postinst() {
 	elog "fixing known issues visit:"
 	elog "         https://www.gentoo.org/doc/en/udev-guide.xml"
 	elog
-
-	# https://cgit.freedesktop.org/systemd/systemd/commit/rules/50-udev-default.rules?id=3dff3e00e044e2d53c76fa842b9a4759d4a50e69
-	# https://bugs.gentoo.org/246847
-	# https://bugs.gentoo.org/514174
-	enewgroup input
-
-	# Update hwdb database in case the format is changed by udev version.
-	if has_version 'sys-apps/hwids[udev]'; then
-		udevadm hwdb --update --root="${ROOT%/}"
-		# Only reload when we are not upgrading to avoid potential race w/ incompatible hwdb.bin and the running udevd
-		if [[ -z ${REPLACING_VERSIONS} ]]; then
-			# https://cgit.freedesktop.org/systemd/systemd/commit/?id=1fab57c209035f7e66198343074e9cee06718bda
-			if [[ ${ROOT} != "" ]] && [[ ${ROOT} != "/" ]]; then
-				return 0
-			fi
-			udevadm control --reload
-		fi
-	fi
 }
diff --git a/sys-fs/eudev/eudev-1.9-r2.ebuild b/sys-fs/eudev/eudev-1.9-r2.ebuild
index 23f027b2b29d..1f7705244f2a 100644
--- a/sys-fs/eudev/eudev-1.9-r2.ebuild
+++ b/sys-fs/eudev/eudev-1.9-r2.ebuild
@@ -250,22 +250,41 @@ pkg_postinst() {
 		ewarn "else losetup may be confused when looking for unused devices."
 	fi
 
+	# https://cgit.freedesktop.org/systemd/systemd/commit/rules/50-udev-default.rules?id=3dff3e00e044e2d53c76fa842b9a4759d4a50e69
+	# https://bugs.gentoo.org/246847
+	# https://bugs.gentoo.org/514174
+	enewgroup input
+
+	# REPLACING_VERSIONS should only ever have zero or 1 values but in case it doesn't,
+	# process it as a list.  We only care about the zero case (new install) or the case where
+	# the same version is being re-emerged.  If there is a second version, allow it to abort.
+	local rv rvres=doitnew
+	for rv in ${REPLACING_VERSIONS} ; do
+		if [[ ${rvres} == doit* ]]; then
+			if [[ ${rv%-r*} == ${PV} ]]; then
+				rvres=doit
+			else
+				rvres=${rv}
+			fi
+		fi
+	done
+
 	if use hwdb && has_version 'sys-apps/hwids[udev]'; then
 		udevadm hwdb --update --root="${ROOT%/}"
 
 		# https://cgit.freedesktop.org/systemd/systemd/commit/?id=1fab57c209035f7e66198343074e9cee06718bda
 		# reload database after it has be rebuilt, but only if we are not upgrading
 		# also pass if we are -9999 since who knows what hwdb related changes there might be
-		if [[ ${REPLACING_VERSIONS%-r*} == ${PV} || -z ${REPLACING_VERSIONS} ]] && \
-		[[ ${ROOT%/} == "" ]] && [[ ${PV} != "9999" ]]; then
+		if [[ ${rvres} == doit* ]] && [[ ${ROOT%/} == "" ]] && [[ ${PV} != "9999" ]]; then
 			udevadm control --reload
 		fi
 	fi
-
-	ewarn
-	ewarn "You need to restart eudev as soon as possible to make the"
-	ewarn "upgrade go into effect:"
-	ewarn "\t/etc/init.d/udev --nodeps restart"
+	if [[ ${rvres} != doitnew ]]; then
+		ewarn
+		ewarn "You need to restart eudev as soon as possible to make the"
+		ewarn "upgrade go into effect:"
+		ewarn "\t/etc/init.d/udev --nodeps restart"
+	fi
 
 	if use rule-generator && use openrc && \
 	[[ -x $(type -P rc-update) ]] && rc-update show | grep udev-postmount | grep -qsv 'boot\|default\|sysinit'; then
@@ -281,22 +300,4 @@ pkg_postinst() {
 	elog "fixing known issues visit:"
 	elog "         https://www.gentoo.org/doc/en/udev-guide.xml"
 	elog
-
-	# https://cgit.freedesktop.org/systemd/systemd/commit/rules/50-udev-default.rules?id=3dff3e00e044e2d53c76fa842b9a4759d4a50e69
-	# https://bugs.gentoo.org/246847
-	# https://bugs.gentoo.org/514174
-	enewgroup input
-
-	# Update hwdb database in case the format is changed by udev version.
-	if has_version 'sys-apps/hwids[udev]'; then
-		udevadm hwdb --update --root="${ROOT%/}"
-		# Only reload when we are not upgrading to avoid potential race w/ incompatible hwdb.bin and the running udevd
-		if [[ -z ${REPLACING_VERSIONS} ]]; then
-			# https://cgit.freedesktop.org/systemd/systemd/commit/?id=1fab57c209035f7e66198343074e9cee06718bda
-			if [[ ${ROOT} != "" ]] && [[ ${ROOT} != "/" ]]; then
-				return 0
-			fi
-			udevadm control --reload
-		fi
-	fi
 }
diff --git a/sys-fs/eudev/eudev-3.1.2.ebuild b/sys-fs/eudev/eudev-3.1.2.ebuild
index e061076b418e..f17bcba6d015 100644
--- a/sys-fs/eudev/eudev-3.1.2.ebuild
+++ b/sys-fs/eudev/eudev-3.1.2.ebuild
@@ -230,44 +230,45 @@ pkg_postinst() {
 		ewarn "else losetup may be confused when looking for unused devices."
 	fi
 
+	# https://cgit.freedesktop.org/systemd/systemd/commit/rules/50-udev-default.rules?id=3dff3e00e044e2d53c76fa842b9a4759d4a50e69
+	# https://bugs.gentoo.org/246847
+	# https://bugs.gentoo.org/514174
+	enewgroup input
+
+	# REPLACING_VERSIONS should only ever have zero or 1 values but in case it doesn't,
+	# process it as a list.  We only care about the zero case (new install) or the case where
+	# the same version is being re-emerged.  If there is a second version, allow it to abort.
+	local rv rvres=doitnew
+	for rv in ${REPLACING_VERSIONS} ; do
+		if [[ ${rvres} == doit* ]]; then
+			if [[ ${rv%-r*} == ${PV} ]]; then
+				rvres=doit
+			else
+				rvres=${rv}
+			fi
+		fi
+	done
+
 	if use hwdb && has_version 'sys-apps/hwids[udev]'; then
 		udevadm hwdb --update --root="${ROOT%/}"
 
 		# https://cgit.freedesktop.org/systemd/systemd/commit/?id=1fab57c209035f7e66198343074e9cee06718bda
 		# reload database after it has be rebuilt, but only if we are not upgrading
 		# also pass if we are -9999 since who knows what hwdb related changes there might be
-		if [[ ${REPLACING_VERSIONS%-r*} == ${PV} || -z ${REPLACING_VERSIONS} ]] && \
-		[[ ${ROOT%/} == "" ]] && [[ ${PV} != "9999" ]]; then
+		if [[ ${rvres} == doit* ]] && [[ ${ROOT%/} == "" ]] && [[ ${PV} != "9999" ]]; then
 			udevadm control --reload
 		fi
 	fi
-
-	ewarn
-	ewarn "You need to restart eudev as soon as possible to make the"
-	ewarn "upgrade go into effect:"
-	ewarn "\t/etc/init.d/udev --nodeps restart"
+	if [[ ${rvres} != doitnew ]]; then
+		ewarn
+		ewarn "You need to restart eudev as soon as possible to make the"
+		ewarn "upgrade go into effect:"
+		ewarn "\t/etc/init.d/udev --nodeps restart"
+	fi
 
 	elog
 	elog "For more information on eudev on Gentoo, writing udev rules, and"
 	elog "fixing known issues visit:"
 	elog "         https://www.gentoo.org/doc/en/udev-guide.xml"
 	elog
-
-	# https://cgit.freedesktop.org/systemd/systemd/commit/rules/50-udev-default.rules?id=3dff3e00e044e2d53c76fa842b9a4759d4a50e69
-	# https://bugs.gentoo.org/246847
-	# https://bugs.gentoo.org/514174
-	enewgroup input
-
-	# Update hwdb database in case the format is changed by udev version.
-	if has_version 'sys-apps/hwids[udev]'; then
-		udevadm hwdb --update --root="${ROOT%/}"
-		# Only reload when we are not upgrading to avoid potential race w/ incompatible hwdb.bin and the running udevd
-		if [[ -z ${REPLACING_VERSIONS} ]]; then
-			# https://cgit.freedesktop.org/systemd/systemd/commit/?id=1fab57c209035f7e66198343074e9cee06718bda
-			if [[ ${ROOT} != "" ]] && [[ ${ROOT} != "/" ]]; then
-				return 0
-			fi
-			udevadm control --reload
-		fi
-	fi
 }
diff --git a/sys-fs/eudev/eudev-3.1.5.ebuild b/sys-fs/eudev/eudev-3.1.5.ebuild
index 0cb702536bf0..a36ee54d2e62 100644
--- a/sys-fs/eudev/eudev-3.1.5.ebuild
+++ b/sys-fs/eudev/eudev-3.1.5.ebuild
@@ -190,22 +190,41 @@ pkg_postinst() {
 		ewarn "else losetup may be confused when looking for unused devices."
 	fi
 
+	# https://cgit.freedesktop.org/systemd/systemd/commit/rules/50-udev-default.rules?id=3dff3e00e044e2d53c76fa842b9a4759d4a50e69
+	# https://bugs.gentoo.org/246847
+	# https://bugs.gentoo.org/514174
+	enewgroup input
+
+	# REPLACING_VERSIONS should only ever have zero or 1 values but in case it doesn't,
+	# process it as a list.  We only care about the zero case (new install) or the case where
+	# the same version is being re-emerged.  If there is a second version, allow it to abort.
+	local rv rvres=doitnew
+	for rv in ${REPLACING_VERSIONS} ; do
+		if [[ ${rvres} == doit* ]]; then
+			if [[ ${rv%-r*} == ${PV} ]]; then
+				rvres=doit
+			else
+				rvres=${rv}
+			fi
+		fi
+	done
+
 	if use hwdb && has_version 'sys-apps/hwids[udev]'; then
 		udevadm hwdb --update --root="${ROOT%/}"
 
 		# https://cgit.freedesktop.org/systemd/systemd/commit/?id=1fab57c209035f7e66198343074e9cee06718bda
 		# reload database after it has be rebuilt, but only if we are not upgrading
 		# also pass if we are -9999 since who knows what hwdb related changes there might be
-		if [[ ${REPLACING_VERSIONS%-r*} == ${PV} || -z ${REPLACING_VERSIONS} ]] && \
-		[[ ${ROOT%/} == "" ]] && [[ ${PV} != "9999" ]]; then
+		if [[ ${rvres} == doit* ]] && [[ ${ROOT%/} == "" ]] && [[ ${PV} != "9999" ]]; then
 			udevadm control --reload
 		fi
 	fi
-
-	ewarn
-	ewarn "You need to restart eudev as soon as possible to make the"
-	ewarn "upgrade go into effect:"
-	ewarn "\t/etc/init.d/udev --nodeps restart"
+	if [[ ${rvres} != doitnew ]]; then
+		ewarn
+		ewarn "You need to restart eudev as soon as possible to make the"
+		ewarn "upgrade go into effect:"
+		ewarn "\t/etc/init.d/udev --nodeps restart"
+	fi
 
 	if use rule-generator && \
 	[[ -x $(type -P rc-update) ]] && rc-update show | grep udev-postmount | grep -qsv 'boot\|default\|sysinit'; then
@@ -221,22 +240,4 @@ pkg_postinst() {
 	elog "fixing known issues visit:"
 	elog "         https://www.gentoo.org/doc/en/udev-guide.xml"
 	elog
-
-	# https://cgit.freedesktop.org/systemd/systemd/commit/rules/50-udev-default.rules?id=3dff3e00e044e2d53c76fa842b9a4759d4a50e69
-	# https://bugs.gentoo.org/246847
-	# https://bugs.gentoo.org/514174
-	enewgroup input
-
-	# Update hwdb database in case the format is changed by udev version.
-	if has_version 'sys-apps/hwids[udev]'; then
-		udevadm hwdb --update --root="${ROOT%/}"
-		# Only reload when we are not upgrading to avoid potential race w/ incompatible hwdb.bin and the running udevd
-		if [[ -z ${REPLACING_VERSIONS} ]]; then
-			# https://cgit.freedesktop.org/systemd/systemd/commit/?id=1fab57c209035f7e66198343074e9cee06718bda
-			if [[ ${ROOT} != "" ]] && [[ ${ROOT} != "/" ]]; then
-				return 0
-			fi
-			udevadm control --reload
-		fi
-	fi
 }
diff --git a/sys-fs/eudev/eudev-3.2.ebuild b/sys-fs/eudev/eudev-3.2.ebuild
index 52c351cd0f20..e70d95411c64 100644
--- a/sys-fs/eudev/eudev-3.2.ebuild
+++ b/sys-fs/eudev/eudev-3.2.ebuild
@@ -190,22 +190,41 @@ pkg_postinst() {
 		ewarn "else losetup may be confused when looking for unused devices."
 	fi
 
+	# https://cgit.freedesktop.org/systemd/systemd/commit/rules/50-udev-default.rules?id=3dff3e00e044e2d53c76fa842b9a4759d4a50e69
+	# https://bugs.gentoo.org/246847
+	# https://bugs.gentoo.org/514174
+	enewgroup input
+
+	# REPLACING_VERSIONS should only ever have zero or 1 values but in case it doesn't,
+	# process it as a list.  We only care about the zero case (new install) or the case where
+	# the same version is being re-emerged.  If there is a second version, allow it to abort.
+	local rv rvres=doitnew
+	for rv in ${REPLACING_VERSIONS} ; do
+		if [[ ${rvres} == doit* ]]; then
+			if [[ ${rv%-r*} == ${PV} ]]; then
+				rvres=doit
+			else
+				rvres=${rv}
+			fi
+		fi
+	done
+
 	if use hwdb && has_version 'sys-apps/hwids[udev]'; then
 		udevadm hwdb --update --root="${ROOT%/}"
 
 		# https://cgit.freedesktop.org/systemd/systemd/commit/?id=1fab57c209035f7e66198343074e9cee06718bda
 		# reload database after it has be rebuilt, but only if we are not upgrading
 		# also pass if we are -9999 since who knows what hwdb related changes there might be
-		if [[ ${REPLACING_VERSIONS%-r*} == ${PV} || -z ${REPLACING_VERSIONS} ]] && \
-		[[ ${ROOT%/} == "" ]] && [[ ${PV} != "9999" ]]; then
+		if [[ ${rvres} == doit* ]] && [[ ${ROOT%/} == "" ]] && [[ ${PV} != "9999" ]]; then
 			udevadm control --reload
 		fi
 	fi
-
-	ewarn
-	ewarn "You need to restart eudev as soon as possible to make the"
-	ewarn "upgrade go into effect:"
-	ewarn "\t/etc/init.d/udev --nodeps restart"
+	if [[ ${rvres} != doitnew ]]; then
+		ewarn
+		ewarn "You need to restart eudev as soon as possible to make the"
+		ewarn "upgrade go into effect:"
+		ewarn "\t/etc/init.d/udev --nodeps restart"
+	fi
 
 	if use rule-generator && \
 	[[ -x $(type -P rc-update) ]] && rc-update show | grep udev-postmount | grep -qsv 'boot\|default\|sysinit'; then
@@ -221,22 +240,4 @@ pkg_postinst() {
 	elog "fixing known issues visit:"
 	elog "         https://www.gentoo.org/doc/en/udev-guide.xml"
 	elog
-
-	# https://cgit.freedesktop.org/systemd/systemd/commit/rules/50-udev-default.rules?id=3dff3e00e044e2d53c76fa842b9a4759d4a50e69
-	# https://bugs.gentoo.org/246847
-	# https://bugs.gentoo.org/514174
-	enewgroup input
-
-	# Update hwdb database in case the format is changed by udev version.
-	if has_version 'sys-apps/hwids[udev]'; then
-		udevadm hwdb --update --root="${ROOT%/}"
-		# Only reload when we are not upgrading to avoid potential race w/ incompatible hwdb.bin and the running udevd
-		if [[ -z ${REPLACING_VERSIONS} ]]; then
-			# https://cgit.freedesktop.org/systemd/systemd/commit/?id=1fab57c209035f7e66198343074e9cee06718bda
-			if [[ ${ROOT} != "" ]] && [[ ${ROOT} != "/" ]]; then
-				return 0
-			fi
-			udevadm control --reload
-		fi
-	fi
 }
diff --git a/sys-fs/eudev/eudev-4.9999.ebuild b/sys-fs/eudev/eudev-4.9999.ebuild
index 57d3d7624eb2..2d2964029fba 100644
--- a/sys-fs/eudev/eudev-4.9999.ebuild
+++ b/sys-fs/eudev/eudev-4.9999.ebuild
@@ -184,44 +184,45 @@ pkg_postinst() {
 		ewarn "else losetup may be confused when looking for unused devices."
 	fi
 
+	# https://cgit.freedesktop.org/systemd/systemd/commit/rules/50-udev-default.rules?id=3dff3e00e044e2d53c76fa842b9a4759d4a50e69
+	# https://bugs.gentoo.org/246847
+	# https://bugs.gentoo.org/514174
+	enewgroup input
+
+	# REPLACING_VERSIONS should only ever have zero or 1 values but in case it doesn't,
+	# process it as a list.  We only care about the zero case (new install) or the case where
+	# the same version is being re-emerged.  If there is a second version, allow it to abort.
+	local rv rvres=doitnew
+	for rv in ${REPLACING_VERSIONS} ; do
+		if [[ ${rvres} == doit* ]]; then
+			if [[ ${rv%-r*} == ${PV} ]]; then
+				rvres=doit
+			else
+				rvres=${rv}
+			fi
+		fi
+	done
+
 	if use hwdb && has_version 'sys-apps/hwids[udev]'; then
 		udevadm hwdb --update --root="${ROOT%/}"
 
 		# https://cgit.freedesktop.org/systemd/systemd/commit/?id=1fab57c209035f7e66198343074e9cee06718bda
 		# reload database after it has be rebuilt, but only if we are not upgrading
 		# also pass if we are -9999 since who knows what hwdb related changes there might be
-		if [[ ${REPLACING_VERSIONS%-r*} == ${PV} || -z ${REPLACING_VERSIONS} ]] && \
-		[[ ${ROOT%/} == "" ]] && [[ ${PV} != "9999" ]]; then
+		if [[ ${rvres} == doit* ]] && [[ ${ROOT%/} == "" ]] && [[ ${PV} != "9999" ]]; then
 			udevadm control --reload
 		fi
 	fi
-
-	ewarn
-	ewarn "You need to restart eudev as soon as possible to make the"
-	ewarn "upgrade go into effect:"
-	ewarn "\t/etc/init.d/udev --nodeps restart"
+	if [[ ${rvres} != doitnew ]]; then
+		ewarn
+		ewarn "You need to restart eudev as soon as possible to make the"
+		ewarn "upgrade go into effect:"
+		ewarn "\t/etc/init.d/udev --nodeps restart"
+	fi
 
 	elog
 	elog "For more information on eudev on Gentoo, writing udev rules, and"
 	elog "fixing known issues visit:"
 	elog "         https://www.gentoo.org/doc/en/udev-guide.xml"
 	elog
-
-	# https://cgit.freedesktop.org/systemd/systemd/commit/rules/50-udev-default.rules?id=3dff3e00e044e2d53c76fa842b9a4759d4a50e69
-	# https://bugs.gentoo.org/246847
-	# https://bugs.gentoo.org/514174
-	enewgroup input
-
-	# Update hwdb database in case the format is changed by udev version.
-	if has_version 'sys-apps/hwids[udev]'; then
-		udevadm hwdb --update --root="${ROOT%/}"
-		# Only reload when we are not upgrading to avoid potential race w/ incompatible hwdb.bin and the running udevd
-		if [[ -z ${REPLACING_VERSIONS} ]]; then
-			# https://cgit.freedesktop.org/systemd/systemd/commit/?id=1fab57c209035f7e66198343074e9cee06718bda
-			if [[ ${ROOT} != "" ]] && [[ ${ROOT} != "/" ]]; then
-				return 0
-			fi
-			udevadm control --reload
-		fi
-	fi
 }
diff --git a/sys-fs/eudev/eudev-9999.ebuild b/sys-fs/eudev/eudev-9999.ebuild
index 52c351cd0f20..e70d95411c64 100644
--- a/sys-fs/eudev/eudev-9999.ebuild
+++ b/sys-fs/eudev/eudev-9999.ebuild
@@ -190,22 +190,41 @@ pkg_postinst() {
 		ewarn "else losetup may be confused when looking for unused devices."
 	fi
 
+	# https://cgit.freedesktop.org/systemd/systemd/commit/rules/50-udev-default.rules?id=3dff3e00e044e2d53c76fa842b9a4759d4a50e69
+	# https://bugs.gentoo.org/246847
+	# https://bugs.gentoo.org/514174
+	enewgroup input
+
+	# REPLACING_VERSIONS should only ever have zero or 1 values but in case it doesn't,
+	# process it as a list.  We only care about the zero case (new install) or the case where
+	# the same version is being re-emerged.  If there is a second version, allow it to abort.
+	local rv rvres=doitnew
+	for rv in ${REPLACING_VERSIONS} ; do
+		if [[ ${rvres} == doit* ]]; then
+			if [[ ${rv%-r*} == ${PV} ]]; then
+				rvres=doit
+			else
+				rvres=${rv}
+			fi
+		fi
+	done
+
 	if use hwdb && has_version 'sys-apps/hwids[udev]'; then
 		udevadm hwdb --update --root="${ROOT%/}"
 
 		# https://cgit.freedesktop.org/systemd/systemd/commit/?id=1fab57c209035f7e66198343074e9cee06718bda
 		# reload database after it has be rebuilt, but only if we are not upgrading
 		# also pass if we are -9999 since who knows what hwdb related changes there might be
-		if [[ ${REPLACING_VERSIONS%-r*} == ${PV} || -z ${REPLACING_VERSIONS} ]] && \
-		[[ ${ROOT%/} == "" ]] && [[ ${PV} != "9999" ]]; then
+		if [[ ${rvres} == doit* ]] && [[ ${ROOT%/} == "" ]] && [[ ${PV} != "9999" ]]; then
 			udevadm control --reload
 		fi
 	fi
-
-	ewarn
-	ewarn "You need to restart eudev as soon as possible to make the"
-	ewarn "upgrade go into effect:"
-	ewarn "\t/etc/init.d/udev --nodeps restart"
+	if [[ ${rvres} != doitnew ]]; then
+		ewarn
+		ewarn "You need to restart eudev as soon as possible to make the"
+		ewarn "upgrade go into effect:"
+		ewarn "\t/etc/init.d/udev --nodeps restart"
+	fi
 
 	if use rule-generator && \
 	[[ -x $(type -P rc-update) ]] && rc-update show | grep udev-postmount | grep -qsv 'boot\|default\|sysinit'; then
@@ -221,22 +240,4 @@ pkg_postinst() {
 	elog "fixing known issues visit:"
 	elog "         https://www.gentoo.org/doc/en/udev-guide.xml"
 	elog
-
-	# https://cgit.freedesktop.org/systemd/systemd/commit/rules/50-udev-default.rules?id=3dff3e00e044e2d53c76fa842b9a4759d4a50e69
-	# https://bugs.gentoo.org/246847
-	# https://bugs.gentoo.org/514174
-	enewgroup input
-
-	# Update hwdb database in case the format is changed by udev version.
-	if has_version 'sys-apps/hwids[udev]'; then
-		udevadm hwdb --update --root="${ROOT%/}"
-		# Only reload when we are not upgrading to avoid potential race w/ incompatible hwdb.bin and the running udevd
-		if [[ -z ${REPLACING_VERSIONS} ]]; then
-			# https://cgit.freedesktop.org/systemd/systemd/commit/?id=1fab57c209035f7e66198343074e9cee06718bda
-			if [[ ${ROOT} != "" ]] && [[ ${ROOT} != "/" ]]; then
-				return 0
-			fi
-			udevadm control --reload
-		fi
-	fi
 }