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: /snap/core22/current/usr/share/ucf/ [ drwxr-xr-x ]
name : ucf_helper_functions.sh #!/bin/sh UCF="ucf --three-way --debconf-ok" # rename ucf-conffile. This was mostly stolen from cacti.postinst after # a short discussion on debian-mentors, see # http://lists.debian.org/debian-mentors/2013/07/msg00027.html # and the following thread. Thanks to Paul Gevers rename_ucf_file() { local oldname local newname # override UCF_FORCE_CONFFNEW with an empty local variable local UCF_FORCE_CONFFNEW oldname="$1" newname="$2" if [ ! -e "$newname" ] ; then if [ -e "$oldname" ]; then mv "$oldname" "$newname" fi # ucf doesn't offer a documented way to do this, so we need to # peddle around with undocumented ucf internals. sed -i "s|$oldname|$newname|" /var/lib/ucf/hashfile ucfr --purge "$PKGNAME" "$oldname" ucfr "$PKGNAME" "$newname" # else: Don't do anything, leave old file in place fi ucfr "$PKGNAME" "$newname" } generate_directory_structure() { local pkgdir local locdir pkgdir="$1" locdir="$2" # generate empty directory structure (cd "$pkgdir" && find . -type d -print0 ) | \ (cd "$locdir" && xargs -0 mkdir -p --) } # handle a single ucf_conffile by first checking whether the file might be # accociated with a different package. If so, we keep our hands off the file # so that a different package can safely hijack our conffiles. # to hijack a file, simply ucfr it to a package before the ucf processing # code. # If the file is either unassociated or already associated with us, call ucf # proper and register the file as ours. handle_single_ucf_file() { local pkgfile local locfile if [ -n "${UCF_HELPER_FUNCTIONS_DEBUG:-}" ]; then set -x fi pkgfile="$1" locfile="$2" export DEBIAN_FRONTEND PKG="$(ucfq --with-colons "$locdir/$file" | head -n 1 | cut --delimiter=: --fields=2 )" # skip conffile if it is associated with a different package. # This allows other packages to safely hijack our conffiles. if [ -z "$PKG" ] || [ "$PKG" = "$PKGNAME" ]; then $UCF "$pkgfile" "$locdir/$file" ucfr "$PKGNAME" "$locdir/$file" fi set +x } # checks whether a file was deleted in the package and handle it on the local # system appropriately: If the local file differs from what we had previously, # we just unregister it and leave it on the system (preserving local changes), # otherwise we remove it. # this also removes conffiles that are zero-size after the # ucf run, which might happen if the local admin has # deleted a conffile that has changed in the package. handle_deleted_ucf_file() { local locfile local locdir local pkgdir if [ -n "${UCF_HELPER_FUNCTIONS_DEBUG:-}" ]; then set -x fi locfile="$1" pkgdir="$2" locdir="$3" # compute the name of the reference file in $pkgdir reffile="$(echo "$locfile" | sed "s|$locdir|$pkgdir|")" if ! [ -e "$reffile" ]; then # if the reference file does not exist, then it was removed in the package # do as if the file was replaced with an empty file $UCF /dev/null "$locfile" if [ -s "$locfile" ]; then # the file has non-zero size after the ucf run. local admin must # have decided to keep the file with contents. Done here. : else # the file has zero size and can be removed # remove the file itself ('') and all possible backup/reference extensions for ext in '' '~' '%' .bak .dpkg-tmp .dpkg-new .dpkg-old .dpkg-dist .ucf-new .ucf-old .ucf-dist; do rm -f "${locfile}$ext" done fi # unregister the file anyhow since the package doesn't know about it any more ucf --purge "${locfile}" ucfr --purge "$PKGNAME" "${locfile}" fi set +x } handle_all_ucf_files() { local pkgdir local locdir pkgdir="$1" locdir="$2" generate_directory_structure "$pkgdir" "$locdir" # handle regular ucf-conffiles by iterating through all conffiles # that come with the package for file in $(find "$pkgdir" -type f -printf '%P\n' ); do handle_single_ucf_file "$pkgdir/$file" "$locdir/$file" done # handle ucf-conffiles that were deleted in our package by iterating # through all ucf-conffiles that are registered for the package for locfile in $(ucfq --with-colons "$PKGNAME" | cut --delimiter=: --fields=1); do handle_deleted_ucf_file "$locfile" "$pkgdir" "$locdir" done } # vim:sw=4:sts=4:et: