compat-usrmerge/convertfs

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#!/bin/bash
# based on code from dracut convertfs.sh
ROOT=
# the package is installed with AutoReq off, so no guarantee that
# coreutils actually works
if ! (cp --help && mountpoint --help && mountpoint --help) > /dev/null; then
echo "tools not functional, exit"
exit 1
fi
# clean up after ourselves no matter how we die.
cleanup() {
echo "Something failed, cleaning up"
for dir in bin sbin lib lib64; do
rm -rf -- "$ROOT/usr/${dir}.usrmerge"
done
}
trap 'ret=$?; [[ $ret -ne 0 ]] && cleanup;exit $ret;' EXIT
trap 'exit 1;' SIGINT
mountpoint -q "$ROOT/usr" || CP_HARDLINK="-l"
set -e
while read dev mp other; do
for dir in bin sbin lib lib64; do
if [ "${mp#$ROOT/$dir}" != "$mp" ] || [ "${mp#$ROOT/usr/$dir}" != "$mp" ]; then
echo "Please unmount $mp before the conversion"
exit 1
fi
done
done < /proc/mounts
# merge / and /usr in new dir in /usr
for dir in bin sbin lib lib64; do
rm -rf -- "$ROOT/usr/${dir}.usrmerge"
[[ -L "$ROOT/$dir" ]] && continue
[[ -d "$ROOT/$dir" ]] || continue
echo "Make a copy of \`$ROOT/$dir'."
[[ -d "$ROOT/$dir" ]] \
&& cp -ax -l "$ROOT/$dir" "$ROOT/usr/${dir}.usrmerge"
# cp can't handle copying a dir over non-directories. So move
# those away in advance. Happened with /lib/udev existing as
# link on older distros
while read d; do
f="$ROOT/usr/$dir.usrmerge/$d"
if test -e "$f" -a \( -L "$f" -o ! -d "$f" \); then
echo "Warning: /$dir/$d conflicts with directory /usr/$dir/$d and will be removed"
rm -rf "$f.usrmerge~"
mv "$f" "$f.usrmerge~"
fi
done < <(find "$ROOT/usr/$dir" -xdev -type d -printf "%P\n" )
echo "Merge the copy with \`$ROOT/usr/$dir'."
[[ -d "$ROOT/usr/${dir}.usrmerge" ]] \
|| mkdir -p "$ROOT/usr/${dir}.usrmerge"
cp -axT $CP_HARDLINK --backup --suffix=.usrmerge~ "$ROOT/usr/$dir" "$ROOT/usr/${dir}.usrmerge"
echo "Clean up duplicates in \`$ROOT/usr/$dir'."
# delete all symlinks that have been backed up. /usr versions
# override / ones
find "$ROOT/usr/${dir}.usrmerge" -xdev -type l -name '*.usrmerge~' -delete || :
# in rare cases the symlinks may point from /usr to /, so remove
# the link in that case
while read file; do
o=${file%%.usrmerge~}
[ -L "$o" ] && mv -f "$file" "$o"
done < <(find "$ROOT/usr/${dir}.usrmerge" \
-xdev -name '*.usrmerge~' -type f)
done
# switch over merged dirs in /usr
for dir in bin sbin lib lib64; do
if [ -d "$ROOT/usr/${dir}.usrmerge" ]; then
echo "Switch to new \`$ROOT/usr/$dir'."
/usr/libexec/xmv "$ROOT/usr/${dir}.usrmerge" "$ROOT/usr/$dir"
fi
done
# replace dirs in / with links to /usr
for dir in bin sbin lib lib64; do
if [ ! -L "$ROOT/$dir" -a -d "$ROOT/$dir" ]; then
echo "Create \`$ROOT/$dir' symlink."
rm --one-file-system -rf "$ROOT/${dir}.usrmerge" || :
ln -s usr/$dir "$ROOT/${dir}.usrmerge"
/usr/libexec/xmv "$ROOT/$dir" "$ROOT/${dir}.usrmerge"
fi
done
echo "Clean up backup files."
# everything seems to work; cleanup
for dir in bin sbin lib lib64; do
for pfx in usr/ /; do
# if we get killed in the middle of "rm -rf", ensure not to leave
# an incomplete directory, which is moved back by cleanup()
d="$ROOT/${pfx}${dir}.usrmerge"
if [ -d "$d" ]; then
echo "$d ..."
mv "$d" "$d~"
rm --one-file-system -rf "$d~"
fi
done
done
# XXX: confirm this is needed
for dir in lib lib64; do
[[ -d "$ROOT/$dir" ]] || continue
for lib in "$ROOT"/usr/${dir}/lib*.so*.usrmerge~; do
[[ -f $lib ]] || continue
mv -v $lib ${lib/.so/_so}
done
done
set +e
echo "Run ldconfig."
ldconfig -r "$ROOT" || :