saving uncommitted changes in /etc prior to emerge run

udev/rules.d/70-persistent-cd.rules

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+# This file was automatically generated by the /lib64/udev/write_cd_rules
+# program, run by the cd-aliases-generator.rules rules file.
+#
+# You can modify it, as long as you keep each rule on a single
+# line, and set the $GENERATED variable.
+
+# DVD_RW_ND-4550A (pci-0000:03:00.1-scsi-0:0:0:0)
+SUBSYSTEM=="block", ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="pci-0000:03:00.1-scsi-0:0:0:0", SYMLINK+="cdrom", ENV{GENERATED}="1"
+SUBSYSTEM=="block", ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="pci-0000:03:00.1-scsi-0:0:0:0", SYMLINK+="cdrw", ENV{GENERATED}="1"
+SUBSYSTEM=="block", ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="pci-0000:03:00.1-scsi-0:0:0:0", SYMLINK+="dvd", ENV{GENERATED}="1"
+SUBSYSTEM=="block", ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="pci-0000:03:00.1-scsi-0:0:0:0", SYMLINK+="dvdrw", ENV{GENERATED}="1"
+
+# Virt._CD_DVD-ROM (platform-vhba-scsi-0:0:0:0)
+SUBSYSTEM=="block", ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="platform-vhba-scsi-0:0:0:0", SYMLINK+="cdrom1", ENV{GENERATED}="1"
+SUBSYSTEM=="block", ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="platform-vhba-scsi-0:0:0:0", SYMLINK+="dvd1", ENV{GENERATED}="1"
+
+# Virt._CD_DVD-ROM (platform-vhba-scsi-0:0:2:0)
+SUBSYSTEM=="block", ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="platform-vhba-scsi-0:0:2:0", SYMLINK+="cdrom2", ENV{GENERATED}="1"
+SUBSYSTEM=="block", ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="platform-vhba-scsi-0:0:2:0", SYMLINK+="dvd2", ENV{GENERATED}="1"
+
+# Virt._CD_DVD-ROM (platform-vhba-scsi-0:0:1:0)
+SUBSYSTEM=="block", ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="platform-vhba-scsi-0:0:1:0", SYMLINK+="cdrom3", ENV{GENERATED}="1"
+SUBSYSTEM=="block", ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="platform-vhba-scsi-0:0:1:0", SYMLINK+="dvd3", ENV{GENERATED}="1"
+
+# Virt._CD_DVD-ROM (platform-vhba-scsi-0:0:3:0)
+SUBSYSTEM=="block", ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="platform-vhba-scsi-0:0:3:0", SYMLINK+="cdrom4", ENV{GENERATED}="1"
+SUBSYSTEM=="block", ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="platform-vhba-scsi-0:0:3:0", SYMLINK+="dvd4", ENV{GENERATED}="1"
+

udev/rules.d/70-persistent-net.rules

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+# This file was automatically generated by the /lib64/udev/write_net_rules
+# program, run by the persistent-net-generator.rules rules file.
+#
+# You can modify it, as long as you keep each rule on a single
+# line, and change only the value of the NAME= key.
+
+# PCI device 0x11ab:0x4364 (sky2)
+SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:16:e6:51:2d:b4", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"
+
+# PCI device 0x8086:0x153b (e1000e)
+SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="94:de:80:6b:dd:cc", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1"

udev/rules.d/80-net-name-slot.rules

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+#
+# Udev 197 and above has implemented predictable network interface names
+# for hardware network interfaces. This new scheme does not affect
+# stacked network interfaces such as bonds, bridges or vlans.
+#
+# This file is here to prevent your interfaces from being renamed automatically,
+# because the new names will be drastically different from the eth*, wlan*, etc
+# names you are used to working with.
+#
+# To activate this function, move this file to a name that doesn't end in.rules,
+# or remove it then reboot your system.
+#
+# If you want to deactivate this function, install a udev rules file as
+# /etc/udev/rules.d/80-net-name-slot.rules then reboot your system.
+#
+# This functionality has not been tested with gentoo. In fact, we are aware that
+# things will break if you activate it.
+#
+# If you are not comfortable testing this, leave this file as is. We will
+# publish a news item when you can migrate.
+#
+# If you do want to activate and help us come up with a migration plan, feel
+# free to do so and report bugs.
+# Your bugs should block the following tracker:
+# https://bugs.gentoo.org/show_bug.cgi?id=450938
+#
+# Before you activate this function, it is important that you fully understand
+# the following documentation:
+#
+# http://www.freedesktop.org/wiki/Software/systemd/PredictableNetworkInterfaceNames
+#
+# Also, be aware that you can get the attributes of your network interface that
+# would be used to name the interface in the new scheme by doing the following
+# with this version of udev running:
+#
+# udevadm test-builtin net_id /sys/class/net/ifname 2> /dev/null
+#
+# for example, on my system, I can find that eth0's new name would be enp1s5.
+#

udev/udev.conf

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+# see udev.conf(5) for details
+
+#udev_log="info"