From 87f5eb6300d07541a20cd590b3308c233ab027d7 Mon Sep 17 00:00:00 2001
From: Pierre Schmitz <pierre@archlinux.de>
Date: Tue, 17 Aug 2010 19:23:16 +0200
Subject: Use host mirror in chroot environment

* Set first enabled mirror found mirrorlist as mirror within the chroot.
* If the mirror is local bind its directory read-only into the chroot.
* Fallback is the kernel.org mirror.
---
 mkarchroot | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/mkarchroot b/mkarchroot
index b7249a4..fcb65db 100755
--- a/mkarchroot
+++ b/mkarchroot
@@ -72,6 +72,16 @@ if [ -z "$cache_dir" ]; then
 	unset cache_conf
 fi
 
+if [ -f /etc/pacman.d/mirrorlist ]; then
+	host_mirror=$(grep -v '^#' -m1 /etc/pacman.d/mirrorlist | sed -E 's#/os/(i686|x86_64)#/os/\$arch#g')
+fi
+if [ -z "${host_mirror}" ]; then
+	host_mirror='Server = http://mirrors.kernel.org/archlinux/$repo/os/$arch'
+fi
+if echo "${host_mirror}" | grep -q 'file://'; then
+	host_mirror_path=$(echo "${host_mirror}" | sed -E 's#Server\s=\sfile://(/.*)/\$repo/os/(\$arch|i686|x86_64)#\1#g')
+fi
+
 # {{{ functions 
 
 chroot_mount() {
@@ -94,12 +104,19 @@ chroot_mount() {
 	[ -e "${working_dir}/${cache_dir}" ] || mkdir -p "${working_dir}/${cache_dir}"
 	mount -o bind "${cache_dir}" "${working_dir}/${cache_dir}"
 
+	if [ -n "${host_mirror_path}" ]; then
+		[ -e "${working_dir}/${host_mirror_path}" ] || mkdir -p "${working_dir}/${host_mirror_path}"
+		mount -o bind "${host_mirror_path}" "${working_dir}/${host_mirror_path}"
+		mount -o remount,ro,bind "${host_mirror_path}" "${working_dir}/${host_mirror_path}"
+	fi
+
 	trap 'chroot_umount' 0 1 2 15
 }
 
 copy_hostconf () {
 	cp /etc/mtab "${working_dir}/etc/mtab"
 	cp /etc/resolv.conf "${working_dir}/etc/resolv.conf"
+	echo "${host_mirror}" > ${working_dir}/etc/pacman.d/mirrorlist
 }
 
 chroot_umount () {
@@ -109,6 +126,7 @@ chroot_umount () {
 	umount "${working_dir}/dev/shm"
 	umount "${working_dir}/dev"
 	umount "${working_dir}/${cache_dir}"
+	[ -n "${host_mirror_path}" ] && umount "${working_dir}/${host_mirror_path}"
 }
 # }}}
 
-- 
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