chrootで開発環境を切り替えするやつ。

devenv

#!/bin/bash
#devenv [template] [dir]
templateDir=/devenv/
usage(){
    echo "devenv [template] [dir]"
    echo
}

if [ $EUID != 0 ]; then
    echo "Please run as root user"
    exit 1
fi

if [ $# -ne 2 ]; then
    echo "invalid arguments"
    usage 
    exit
fi

for dir in $templateDir*; do 
    if [ -d "$dir" ]; then
        if [ ! -f "$dir/config" ]; then
            echo "missing machine config file [$dir]"
            continue
        fi
        Rootdir=$dir/root
        Script=/bin/bash
        source "$dir/config"

        if [ ! -d "$Rootdir" ]; then
            echo "missing machine root directory [$Rootdir]"
            continue
        fi

        if [ ! "$Name" == "$1" ]; then
            continue
        fi
                
        declare -a machine=("$Rootdir" "$Script")
        break
    fi
done

if [ ! "$machine" ]; then
    echo "argument error: missing templates [$1]"
    exit
fi
machinePath=${machine[0]}

 
 mountpoint -q "$machinePath/proc" || mount -t proc none "$machinePath/proc"
 mountpoint -q "$machinePath/sys" || mount -o bind /sys "$machinePath/sys"
 mountpoint -q "$machinePath/dev" || mount -o bind /dev "$machinePath/dev"
 mountpoint -q "$machinePath/devsrc" || mount -o bind "$2" "$machinePath/devsrc"
 
chroot "${machinePath}" ${machine[1]}
 
 umount "$machinePath/proc"
 umount "$machinePath/sys"
 umount "$machinePath/dev"
 umount "$machinePath/devsrc"
echo EXIT.

devnewenv

#!/bin/bash
#devenv [template] [dir]
templateBaseDir=/devenv/
mirror=http://dl-cdn.alpinelinux.org/alpine/
usage(){
    echo "devnewenv [templateName]"
    echo
}

if [ $EUID != 0 ]; then
    echo "Please run as root user"
    exit 1
fi

if [ $# -ne 1 ]; then
    echo "invalid arguments"
    usage 
    exit
fi
templateName=$1
templateDir=${templateBaseDir}${templateName}
chroot_dir=${templateDir}/root

mkdir -p ${chroot_dir}/devsrc

cat << _EOF_ > ${templateDir}/config
Name=${templateName}
Script="/bin/ash -l"
_EOF_

apk.static \
    -X ${mirror}/latest-stable/main \
    -U --allow-untrusted \
    --root ${chroot_dir} \
    --initdb add alpine-base

pushd ${chroot_dir}
mknod -m 666 ${chroot_dir}/dev/full c 1 7
mknod -m 666 ${chroot_dir}/dev/ptmx c 5 2 
mknod -m 644 ${chroot_dir}/dev/random c 1 8 
mknod -m 644 ${chroot_dir}/dev/urandom c 1 9 
mknod -m 666 ${chroot_dir}/dev/zero c 1 5 
mknod -m 666 ${chroot_dir}/dev/tty c 5 0

cp /etc/resolv.conf ${chroot_dir}/etc/ 
mkdir -p ${chroot_dir}/root

mkdir -p ${chroot_dir}/etc/apk 
echo "${mirror}/v3.8/main" > ${chroot_dir}/etc/apk/repositories

mount -t proc none ${chroot_dir}/proc
mount -o bind /sys ${chroot_dir}/sys
mount -o bind /dev ${chroot_dir}/dev
chroot "${chroot_dir}" /bin/sh -c "\
rc-update add devfs sysinit &&\
rc-update add dmesg sysinit &&\
rc-update add mdev sysinit &&\
rc-update add hwclock boot &&\
rc-update add modules boot &&\
rc-update add sysctl boot &&\
rc-update add hostname boot &&\
rc-update add bootmisc boot &&\
rc-update add syslog boot &&\
rc-update add mount-ro shutdown &&\
rc-update add killprocs shutdown &&\
rc-update add savecache shutdown &&\
echo rc-update done. &&\
exit;\
"
umount "${chroot_dir}/proc"
umount "${chroot_dir}/sys"
umount "${chroot_dir}/dev"

echo Done.