Current File : //usr/share/ucf/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
}
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