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#!/bin/bash
#
# alpine-chroot - Setup a Alpine Linux installation in a chroot.
# Copyright (c) 2011-2013 Fabian Affolter <fabian at affolter-engineering.ch>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# Most parts of this script are written down at
# http://wiki.alpinelinux.org/wiki/Setting_up_the_build_environment_in_chroot
MIRROR=http://dl-5.alpinelinux.org/alpine
APK_TOOL=apk-tools-static-2.4.0-r1.apk
usage() {
cat <<__EOF__
usage: alpine-chroot [-h] [-d Directory] [-r Release] [-a Architecture]
Setup an Alpine Installation in a chroot
options:
-h Show this help
-a Choice of architecture, default: Host architecture
-d Directory to install the chroot
-r Release of Alpine Linux, default: Latest stable release
__EOF__
exit 1
}
case $1 in
""|"-h"|"--help") usage;;
esac
while getopts ":h:a:d:r:" opt; do
case $opt in
h) usage;;
a) ARCH="$OPTARG";;
d) CHROOT="$OPTARG";;
r) RELEASE="$OPTARG";;
\?) echo "Invalid option: -$OPTARG" >&2; exit 1;;
:) echo "Option -$OPTARG requires an argument." >&2; exit 1;;
esac
done
if [ "$RELEASE" = "" ]; then
LATEST=`curl --silent $MIRROR/.latest.txt`
RELEASE=${LATEST:31:3}
fi
if [ "$ARCH" = "" ]; then
ARCH=`uname -i`
fi
if [ "$ARCH" != "x86" ] && [ "$ARCH" != "x86_64" ]; then
echo "$ARCH not supported. Only x86 and x86_64 are supported."
exit 1
fi
if [ "$CHROOT" = "" ]; then
CHROOT="alpinechroot-$RELEASE"
fi
# Root has $UID 0
ROOT_UID=0
if [ "$UID" != "$ROOT_UID" ]; then
echo "You are not root. Please use su to become root."
exit 0
fi
if [ -d $CHROOT ]; then
echo "$CHROOT exists already."
exit 0
else
mkdir -p $CHROOT
fi
build_chroot() {
curl --silent $MIRROR/v$RELEASE/main/$ARCH/$APK_TOOL -o $APK_TOOL
tar -xzf $APK_TOOL
./sbin/apk.static \
-X $MIRROR/v$RELEASE/main \
-U \
--allow-untrusted \
--root ././$CHROOT \
--initdb add alpine-base alpine-sdk
mkdir -p $CHROOT{/root,/etc/apk,/proc}
mount --bind /proc $CHROOT/proc
mknod -m 0666 $CHROOT/dev/full c 1 7
mknod -m 0666 $CHROOT/dev/ptmx c 5 2
mknod -m 0644 $CHROOT/dev/random c 1 8
mknod -m 0644 $CHROOT/dev/urandom c 1 9
mknod -m 0666 $CHROOT/dev/zero c 1 5
mknod -m 0666 $CHROOT/dev/tty c 5 0
rm -f $CHROOT/dev/null
mknod -m 0666 $CHROOT/dev/null c 1 3
cp /etc/resolv.conf $CHROOT/etc/
echo "$MIRROR/v$RELEASE/main" > $CHROOT/etc/apk/repositories
# Cleaning up
rm -rf sbin
rm -f APK_TOOL
echo " "
echo "Your Alpine Linux installation in '$CHROOT' is ready now."
echo "To start Alpine chroot, run as root:"
echo " chroot $CHROOT /bin/sh -l"
echo " "
}
build_chroot
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