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systemd/scripts-udev-convert-lib-udev-path.sh

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#! /bin/bash
#
# When upgrading from systems predating systemd (SLE11, openSUSE
# 12.x), udev libexec directory was changed from /lib/udev to
# /usr/lib/udev. Some customer scripts might still rely on the old
# path, therefore try to create a symlink that preserves the old path
# (see bsc#1050152).
#
# This script is supposed to be called from the %posttrans scection of
# the udev package.
#
convert_lib_udev_path () {
local failed=/bin/false
# Sanity check: /usr/lib/udev must exist at that point since
# the new udev package should have been installed.
if ! test -d /usr/lib/udev; then
echo >&2 "/usr/lib/udev does not exist, refusing to create"
echo >&2 "/lib/udev compat symlink."
return 1
fi
# If the symlink is missing it probably means that we're
# upgrading and the old /lib/udev path was removed as it was
# empty at the time the old version of udev was uninstalled.
if ! test -e /lib/udev; then
echo "Creating /lib/udev -> /usr/lib/udev symlink."
ln -s /usr/lib/udev /lib/udev
return
fi
# If a symlink already exists, simply assume that we already
# did the job. IOW we're just doing a simple update of
# systemd/udev (not upgrading).
if test -L /lib/udev; then
return
fi
# Sanity check: refuse to deal with anything but a directory.
if ! test -d /lib/udev; then
echo >&2 "/lib/udev is not either a directory nor a symlink !"
echo >&2 "It won't be converted into a symlink to /usr/lib/udev."
echo >&2 "Please create it manually."
return 1
fi
# /lib/udev exists and is still a directory (probably not
# empty otherwise it would have been removed when the old
# version of udev was uninstalled), we try to merge its
# content with the new location and if it fails we warn the
# user and let him sort this out.
shopt -s globstar
for f in /lib/udev/**; do
if test -d "$f"; then
continue
fi
if test -e /usr/"$f"; then
echo >&2 "Failed to migrate '$f' to /usr/lib/udev because it already exists."
failed=/bin/true
continue
fi
echo "Migrating '$f' in /usr/lib/udev"
if ! cp -a --parents "$f" /usr; then
echo >&2 "Failed to move '$f' in /usr/lib/udev."
failed=/bin/true
continue
fi
rm "$f"
done
shopt -u globstar
if ! $failed; then
rm -fr /lib/udev &&
ln -s ../usr/lib/udev /lib/udev &&
echo "The content of /lib/udev has been moved in /usr/lib/udev successfully" &&
echo "and /lib/udev is now a symlink pointing to /usr/lib/udev." &&
echo "Please note /lib/udev is deprecated and shouldn't be used by" &&
echo "new scripts/applications anymore." ||
failed=/bin/true
fi
if $failed; then
echo >&2 "Converting /lib/udev into a symlink pointing to /usr/lib/udev was not"
echo >&2 "possible due to previous error(s)."
echo >&2 "Please fix them and then create the symlink with:"
echo >&2 " 'ln -s ../usr/lib/udev /lib/udev'."
return 1
fi
}
convert_lib_udev_path