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#!/bin/bash

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ROOT="$1"

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if [[ ! -d "$ROOT" ]]; then

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echo "Usage: $0 <rootdir>"

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exit 1

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if [[ "$ROOT" -ef / ]]; then

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echo "Can't convert the running system."

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echo "Please boot with 'rd.convertfs' on the kernel command line,"

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echo "to update with the help of the initramfs,"

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echo "or run this script from a rescue system."

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exit 1

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while [[ "$ROOT" != "${ROOT%/}" ]]; do

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ROOT=${ROOT%/}

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done

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if [ ! -L $ROOT/var/run -a -e $ROOT/var/run ]; then

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echo "Converting /var/run to symlink"

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mv -f $ROOT/var/run $ROOT/var/run.runmove~

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ln -sfn ../run $ROOT/var/run

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if [ ! -L $ROOT/var/lock -a -e $ROOT/var/lock ]; then

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echo "Converting /var/lock to symlink"

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mv -f $ROOT/var/lock $ROOT/var/lock.lockmove~

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ln -sfn ../run/lock $ROOT/var/lock

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needconvert() {

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for dir in "$ROOT/bin" "$ROOT/sbin" "$ROOT/lib" "$ROOT/lib64"; do

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if [[ -e "$dir" ]]; then

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[[ -L "$dir" ]] || return 0

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done

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return 1

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}

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if ! [ -e "$ROOT/usr/bin" ]; then

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echo "$ROOT/usr/bin does not exist!"

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echo "Make sure, the kernel command line has enough information"

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echo "to mount /usr (man dracut.cmdline)"

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exit 1

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if ! needconvert; then

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echo "Your system is already converted."

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exit 0

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testfile="$ROOT/.usrmovecheck$$"

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rm -f -- "$testfile"

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> "$testfile"

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if [[ ! -e "$testfile" ]]; then

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echo "Cannot write to $ROOT/"

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exit 1

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rm -f -- "$testfile"

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testfile="$ROOT/usr/.usrmovecheck$$"

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rm -f -- "$testfile"

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> "$testfile"

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if [[ ! -e "$testfile" ]]; then

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echo "Cannot write to $ROOT/usr/"

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exit 1

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rm -f -- "$testfile"

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find_mount() {

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local dev mnt etc wanted_dev

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wanted_dev="$(readlink -e -q $1)"

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while read dev mnt etc || [ -n "$dev" ]; do

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[ "$dev" = "$wanted_dev" ] && echo "$dev" && return 0

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done < /proc/mounts

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return 1

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}

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# usage: ismounted <mountpoint>

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# usage: ismounted /dev/<device>

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if command -v findmnt >/dev/null; then

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ismounted() {

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findmnt "$1" > /dev/null 2>&1

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}

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else

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ismounted() {

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if [ -b "$1" ]; then

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find_mount "$1" > /dev/null && return 0

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return 1

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while read a m a || [ -n "$m" ]; do

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[ "$m" = "$1" ] && return 0

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done < /proc/mounts

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return 1

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}

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# clean up after ourselves no matter how we die.

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cleanup() {

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echo "Something failed. Move back to the original state"

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for dir in "$ROOT/bin" "$ROOT/sbin" "$ROOT/lib" "$ROOT/lib64" \

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"$ROOT/usr/bin" "$ROOT/usr/sbin" "$ROOT/usr/lib" \

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"$ROOT/usr/lib64"; do

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[[ -d "${dir}.usrmove-new" ]] && rm -fr -- "${dir}.usrmove-new"

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if [[ -d "${dir}.usrmove-old" ]]; then

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mv "$dir" "${dir}.del~"

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mv "${dir}.usrmove-old" "$dir"

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rm -fr -- "${dir}.del~"

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done

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}

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trap 'ret=$?; [[ $ret -ne 0 ]] && cleanup;exit $ret;' EXIT

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trap 'exit 1;' SIGINT

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ismounted "$ROOT/usr" || CP_HARDLINK="-l"

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set -e

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# merge / and /usr in new dir in /usr

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for dir in bin sbin lib lib64; do

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rm -rf -- "$ROOT/usr/${dir}.usrmove-new"

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[[ -L "$ROOT/$dir" ]] && continue

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[[ -d "$ROOT/$dir" ]] || continue

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echo "Make a copy of \`$ROOT/usr/$dir'."

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[[ -d "$ROOT/usr/$dir" ]] \

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&& cp -ax -l "$ROOT/usr/$dir" "$ROOT/usr/${dir}.usrmove-new"

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echo "Merge the copy with \`$ROOT/$dir'."

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[[ -d "$ROOT/usr/${dir}.usrmove-new" ]] \

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|| mkdir -p "$ROOT/usr/${dir}.usrmove-new"

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cp -axT $CP_HARDLINK --backup --suffix=.usrmove~ "$ROOT/$dir" "$ROOT/usr/${dir}.usrmove-new"

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echo "Clean up duplicates in \`$ROOT/usr/$dir'."

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# delete all symlinks that have been backed up

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find "$ROOT/usr/${dir}.usrmove-new" -type l -name '*.usrmove~' -delete || :

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# replace symlink with backed up binary

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find "$ROOT/usr/${dir}.usrmove-new" \

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-name '*.usrmove~' \

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-type f \

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-exec bash -c 'p="{}";o=${p%%%%.usrmove~};

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[[ -L "$o" ]] && mv -f "$p" "$o"' ';' || :

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done

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# switch over merged dirs in /usr

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for dir in bin sbin lib lib64; do

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[[ -d "$ROOT/usr/${dir}.usrmove-new" ]] || continue

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echo "Switch to new \`$ROOT/usr/$dir'."

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rm -fr -- "$ROOT/usr/${dir}.usrmove-old"

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mv "$ROOT/usr/$dir" "$ROOT/usr/${dir}.usrmove-old"

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mv "$ROOT/usr/${dir}.usrmove-new" "$ROOT/usr/$dir"

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done

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# replace dirs in / with links to /usr

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for dir in bin sbin lib lib64; do

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[[ -L "$ROOT/$dir" ]] && continue

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[[ -d "$ROOT/$dir" ]] || continue

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echo "Create \`$ROOT/$dir' symlink."

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rm -fr -- "$ROOT/${dir}.usrmove-old" || :

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mv "$ROOT/$dir" "$ROOT/${dir}.usrmove-old"

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ln -sfn usr/$dir "$ROOT/$dir"

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done

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echo "Clean up backup files."

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# everything seems to work; cleanup

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for dir in bin sbin lib lib64; do

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# if we get killed in the middle of "rm -rf", ensure not to leave

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# an incomplete directory, which is moved back by cleanup()

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[[ -d "$ROOT/usr/${dir}.usrmove-old" ]] \

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&& mv "$ROOT/usr/${dir}.usrmove-old" "$ROOT/usr/${dir}.usrmove-old~"

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[[ -d "$ROOT/${dir}.usrmove-old" ]] \

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&& mv "$ROOT/${dir}.usrmove-old" "$ROOT/${dir}.usrmove-old~"

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done

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for dir in bin sbin lib lib64; do

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[[ -d "$ROOT/usr/${dir}.usrmove-old~" ]] \

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&& rm -rf -- "$ROOT/usr/${dir}.usrmove-old~" || :

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[[ -d "$ROOT/${dir}.usrmove-old~" ]] \

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&& rm -rf -- "$ROOT/${dir}.usrmove-old~" || :

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done

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for dir in lib lib64; do

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[[ -d "$ROOT/$dir" ]] || continue

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for lib in "$ROOT"/usr/${dir}/lib*.so*.usrmove~; do

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[[ -f $lib ]] || continue

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mv $lib ${lib/.so/_so}

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done

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done

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set +e

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echo "Run ldconfig."

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ldconfig -r "$ROOT"

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. $ROOT/etc/selinux/config

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if [ -n "$(command -v setfiles)" ] && [ "$SELINUX" != "disabled" ] && [ -f /etc/selinux/${SELINUXTYPE}/contexts/files/file_contexts ]; then

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echo "Fixing SELinux labels"

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setfiles -r $ROOT -p /etc/selinux/${SELINUXTYPE}/contexts/files/file_contexts $ROOT/sbin $ROOT/bin $ROOT/lib $ROOT/lib64 $ROOT/usr/lib $ROOT/usr/lib64 $ROOT/etc/ld.so.cache $ROOT/var/cache/ldconfig || :

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echo "Done."

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exit 0

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