From f2ff891e6eb173ea0ffc4fed185af8ca1b2e15bd Mon Sep 17 00:00:00 2001
From: Mike Frysinger <vapier@gentoo.org>
Date: Mon, 5 Nov 2012 02:34:47 -0500
Subject: [PATCH] use unshare if available

---
 .bin/custom-chroot | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/.bin/custom-chroot b/.bin/custom-chroot
index ae525ed..7c576bb 100755
--- a/.bin/custom-chroot
+++ b/.bin/custom-chroot
@@ -2,6 +2,16 @@
 
 [[ -w / ]] || exec sudo env HOME="$HOME" "$0" "$@"
 
+if [[ -z ${UNSHARE} ]] ; then
+	mount_args=
+	if type -P unshare >&/dev/null ; then
+		UNSHARE=true exec unshare -m -- "$0" "$@"
+	fi
+else
+	mount_args='-n'
+fi
+unset UNSHARE
+
 mounts="proc sys dev dev/pts usr/portage usr/portage/distfiles"
 
 chroot=${0%/*}
@@ -35,7 +45,7 @@ maybe_mount() {
 	local src=/$1 dst=${chroot}/${2:-$1}
 	[[ -d ${src} ]] || return 0
 	mkdir -p "${dst}"
-	grep -sq "${dst}" /proc/mounts || mount --bind "${src}" "${dst}"
+	grep -sq "${dst}" /proc/mounts || mount ${mount_args} --bind "${src}" "${dst}"
 }
 for m in ${mounts} ; do
 	maybe_mount ${m}
@@ -50,6 +60,7 @@ get_type() {
 	esac
 }
 bin_dst=$(get_type bin/bash)
+setarch=
 if [[ -n ${bin_dst} ]] && type -P setarch &>/dev/null ; then
 	setarch="setarch ${bin_dst}"
 fi
-- 
2.39.2