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