chroot2pfs

#!/bin/bash
# Description: create pfs module from changes in chroot
# Author : Alexandr Betkher (betcher) <http://magos-linux.ru>
. `which pfs` 
 
CHROOT="chroot"
buildDir=$SYSMNT/$$-tmp
filter="??*" # нужен для пересборки сабмодуля из кoнтейнера, чтоб не собирать все что в контейнере,  нужно приделать ключ. Пока не важно.
fast_alg=""

HLP () {
echo "Usage: 	$(basename $0) <$(basename $0) keys> <--command>  - command which will be execute in  chroot"
echo "				$(basename $0) <$(basename $0) keys> <--script> - script which will be copied to chroot and run" 
echo "				$(basename $0) module.$EXT  - rebuild module" 
echo "$(basename $0) keys:"
echo "-h | --help - this help"
echo "--command  - команда для выполнения в чруте, параметр должен быть последним в строке"
echo "--script - скрипт, который будет перенесен в чрут и запущен в нем"
echo "-m | --mask - маска для системных бандлов из которых будет создана aufs для chroot"
echo "--mlist - список модулей и папок для создания aufs, расзделеитель в списке - \" ; \" или \" , \" "
echo "--flist   - список модулей и папок из файла"
echo "-f | --fast - fast compression alg"
echo "-n | -o | --name - name for the module (если без расширения $EXT, то в папку соберет)"
echo "-c | --contaner  Тип виртуализации, доступные варианты  \"chroot\", \"nspawn\" (systemd-nspawn)" 
echo "--mkscript - создать скрипт-шаблон"
exit 
}

umount_all () {
for tm in {sys,proc,dev}; do
    while (grep -q $root_br/$tm /proc/mounts ) ; do
        umount $root_br/$tm
    done
done
}

mk_template () {
 cat <<EOF >  ./script-examle.sh
#!/bin/bash
# apt-get install package
# urpmi package
# pacman -S package
# /bin/bash
rm -rf  /var/tmp  /var/cache/{urpmi,ldconfig}  /etc/{urpmi,ld.so.cache,localtime,machine-id,resolv.conf} \ 
/var/lib/{rpm,urpmi,menu} /usr/share/applications/mimeinfo.cache  /.wh* 2>/dev/null
find "$mod_br/usr/share/icons" -type f -name icon-theme.cache 2>/dev/null | xargs rm -f
EOF
echo "WARNING. Do not run ./script-examle.sh in system, use for $(basename $0) only"
echo "Do not make ./script-examle.sh executable, $(basename $0) will do it automaticly"
exit
}

get_layers () {
layers=""
local layers
[ "$MASK" ] && layers=$(aufs-n --hidetop  --reverse --raw '$bname_source $bundle' |grep "$MASK" | awk '{print $2}')
[ "$MLIST" ] && layers="$layers $(echo "$MLIST" |sed 's/[\,,;]/ /g')"
[ "$FLIST" ] && layers="$layers $(cat $FLIST)"
[[ -z  $layers ]] && layers=$(aufs-n --hidetop --reverse --raw '$bname_source $bundle'  | awk '{print $2}')
for item in $layers ; do 
[ -e $item ] && echo $item || exitmsg "	layer:   $item is not exists" 4
done
}

[ "$1" == "--mkscript" ] && mk_template

argslist="$@"
if  echo $argslist |grep -q "\-*command.*" ; then
    command="$(echo $@ |sed 's/^.*\-*command//')"
    argslist="$(echo $@ |sed 's/\-*command.*$//')"
fi

for arg in $argslist
do
  case "${arg}" in
    "-h" | "--help" ) HLP;;
    "-n" | "-o" | "--name") name="yes";;
    "-f" | "--fast") fast_alg="-f" ;;
    "-s" | "--script" ) script="yes" ;;
    "-m" | "--mask") mask="yes" ;;
    "-b" | --builddir ) bdir="yes" ;; # for rebuild only
    "--mlist" ) mlist="yes" ;;
    "--flist" ) flist="yes" ;;
    "-c" | "--contaner" ) contaner=yes;;
    "-"*[A-Za-z]*) echo "$(basename "$0"): invalid option -- '$(echo ${arg} | tr -d '-')'" >&2; exit 1;;
    *) if [ "${name}" == "yes" ]; then NAME="${arg}"
		elif [ "${mlist}" == "yes" ]; then MLIST="${arg}"
		elif [ "${flist}" == "yes" ]; then FLIST="${arg}"
		elif [ "${script}" == "yes" ]; then SCRIPT="${arg}"
		elif [ "${bdir}" = "yes" ]; then   buildDir="$(readlink -e ${arg})/$$-tmp"
		elif [ "${contaner}" == "yes" ]; then CONTANER="${arg}" 
        elif [ "${mask}" == "yes" ]; then MASK="${arg}"
        else modules="${arg} ${modules}" ; fi
        mlist="no"; flist="no"; name="no";  mask="no"; bdir="no"; script="no"; contaner="no";;
  esac
done

# rebuild modules
if  $(file $(echo $modules |awk '{print $1}') 2>/dev/null | grep -q quashfs); then
    for rmod in $modules ; do
    mkdir -p $(dirname $buildDir)
    echo "rebuilding $rmod in $buildDir"
    u2pfs_current=$(realpath $0)
    unsquashfs -d $buildDir "$rmod" -e /var/lib/chroot2pfs -n >/dev/null
    mv $buildDir/var/lib/chroot2pfs/* $buildDir  || exitmsg "Module $rmod was made by another program" 7
    rm -fr $buildDir/var
    CPWD=$(pwd)
    cd $buildDir
    for mod in $(find ./ -type d -name "??*"); do
		SCRIPT=$(readlink -e $(ls -1 ./$mod/*.sh 2>/dev/null ) 2>/dev/null ) ; [ $SCRIPT ] && SCRIPT="--script $SCRIPT"
        $u2pfs_current $(echo $(cat $mod/cmdline) $SCRIPT )  | tee ./urpm2pfs.out
        module=$(cat ./urpm2pfs.out | tail -n1)
        mv $CPWD/$(basename $module) $CPWD/$(basename $module).old 2>/dev/null
        mv $module ${CPWD}/
    done
    cd $CPWD
    rm -rf $buildDir
    newmods="$(echo $CPWD/$(basename $module)) $newmods"
    done
    echo "$newmods"
    exit
fi

allow_only_root

[ $CONTANER ] &&  CHROOT="$CONTANER"
echo "Using:  $CHROOT"
#Имя обязательно, так как зацепиться не за что
[ $NAME ] || read -p "Please enter name for module:      " NAME  

#make root aufs
root_br="$(mkaufs || exitmsg "mkaufs error" 2)"
nn="$(echo "$root_br" | sed -n 's/^.*\([0-9]\)$/\1/p')"
[ -d "$root_br" ] || exitmsg "error mounting aufs" 3
echo "aufs number: $nn"

#add sources as aufs layers
for  i in $(get_layers) ;do
    eval addlayer "$nn" "$i" "$devnull" || exitmsg "can't insert layer to aufs $nn" 5
done 

if [ $CHROOT == "chroot" ] ; then
mkdir -p $root_br/{dev,proc,sys,tmp}
for tm in {dev,proc,sys}; do
    [ /$tm ] && mount -o bind /$tm $root_br/$tm
done
fi

#сохраняем в модуль $@ для последующих пересборок
#надо подумать что еще полезно сохранить
#cp /etc/resolv.conf $root_br/etc/resolv.conf # у Антона было, у меня без этого работает
mkdir -p $root_br/var/lib/chroot2pfs/$(basename "${NAME%.$EXT}")
date > $root_br/var/lib/chroot2pfs/$(basename "${NAME%.$EXT}")/date
echo $@ > $root_br/var/lib/chroot2pfs/$(basename "${NAME%.$EXT}")/cmdline
if [ "$SCRIPT" ] ; then
	[ -f  "$root_br/var/lib/chroot2pfs/$(basename "${NAME%.$EXT}")/$(basename $SCRIPT)" ]  || cp  $SCRIPT  $root_br/var/lib/chroot2pfs/$(basename "${NAME%.$EXT}")/
	chmod +x $root_br/var/lib/chroot2pfs/$(basename "${NAME%.$EXT}")/$(basename $SCRIPT) 
fi

if [ $CHROOT == "nspawn" ] ; then
md5sum /bin/bash | awk '{print $1}' > $root_br/etc/machine-id #  nspawn do not works without machine-id
[ "$SCRIPT" ] || systemd-nspawn -D $root_br   -M ${NAME%.$EXT} $command 
[ "$SCRIPT" ] &&  systemd-nspawn -D $root_br   -M ${NAME%.$EXT}  /var/lib/chroot2pfs/$(basename "${NAME%.$EXT}")/$(basename $SCRIPT)
elif [ $CHROOT == "chroot" ] ; then
[ "$SCRIPT" ] || chroot $root_br $command
[ "$SCRIPT" ] && chroot $root_br /var/lib/chroot2pfs/$(basename "${NAME%.$EXT}")/$(basename $SCRIPT)
else 
BADCONTANER=yes 
echo "Wrong contaner type, must be \"chroot\" or \"nspawn\""
fi

umount_all

mod_br=$SYSMNT/changes$nn
rm -rf $mod_br/tmp >/dev/null
rm -rf $root_br/{dev,proc,sys,tmp} >/dev/null
rmdir "$mod_br"/{dev,proc,sys,lost+found} "$mod_br/var/cache" "$mod_br/var/lib" "$mod_br/var" "$mod_br/etc" 2>/dev/null

[ $BADCONTANER ] || mkpfs $mod_br  $fast_alg  -o $NAME && MODULE="$(readlink -e ${NAME})" 
echo "delaufs $nn"

delaufs $nn
# по этой строке имя модуля получается при пересборке.
echo $MODULE