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| Current File : //bin/dpkg-maintscript-helper |
#!/bin/sh
#
# Copyright © 2007, 2011-2015 Guillem Jover <guillem@debian.org>
# Copyright © 2010 Raphaël Hertzog <hertzog@debian.org>
# Copyright © 2008 Joey Hess <joeyh@debian.org>
# Copyright © 2005 Scott James Remnant (original implementation on www.dpkg.org)
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
# The conffile related functions are inspired by
# https://wiki.debian.org/DpkgConffileHandling
# This script is documented in dpkg-maintscript-helper(1)
##
## Functions to remove an obsolete conffile during upgrade
##
rm_conffile() {
local CONFFILE="$1"
local LASTVERSION="$2"
local PACKAGE="$3"
if [ "$LASTVERSION" = "--" ]; then
LASTVERSION=""
PACKAGE="$DPKG_MAINTSCRIPT_PACKAGE${DPKG_MAINTSCRIPT_ARCH:+:$DPKG_MAINTSCRIPT_ARCH}"
fi
if [ "$PACKAGE" = "--" -o -z "$PACKAGE" ]; then
PACKAGE="$DPKG_MAINTSCRIPT_PACKAGE${DPKG_MAINTSCRIPT_ARCH:+:$DPKG_MAINTSCRIPT_ARCH}"
fi
# Skip remaining parameters up to --
while [ "$1" != "--" -a $# -gt 0 ]; do
shift
done
[ $# -gt 0 ] || badusage "missing arguments after --"
shift
[ -n "$PACKAGE" ] || error "couldn't identify the package"
[ -n "$1" ] || error "maintainer script parameters are missing"
[ -n "$DPKG_MAINTSCRIPT_NAME" ] || \
error "environment variable DPKG_MAINTSCRIPT_NAME is required"
[ -n "$DPKG_MAINTSCRIPT_PACKAGE" ] || \
error "environment variable DPKG_MAINTSCRIPT_PACKAGE is required"
[ "${CONFFILE}" != "${CONFFILE#/}" ] || \
error "conffile '$CONFFILE' is not an absolute path"
validate_optional_version "$LASTVERSION"
debug "Executing $0 rm_conffile in $DPKG_MAINTSCRIPT_NAME" \
"of $DPKG_MAINTSCRIPT_PACKAGE"
debug "CONFFILE=$CONFFILE PACKAGE=$PACKAGE" \
"LASTVERSION=$LASTVERSION ACTION=$1 PARAM=$2"
case "$DPKG_MAINTSCRIPT_NAME" in
preinst)
if [ "$1" = "install" -o "$1" = "upgrade" ] && [ -n "$2" ] &&
dpkg --compare-versions -- "$2" le-nl "$LASTVERSION"; then
prepare_rm_conffile "$CONFFILE" "$PACKAGE"
fi
;;
postinst)
if [ "$1" = "configure" ] && [ -n "$2" ] &&
dpkg --compare-versions -- "$2" le-nl "$LASTVERSION"; then
finish_rm_conffile "$CONFFILE"
fi
;;
postrm)
if [ "$1" = "purge" ]; then
rm -f "$DPKG_ROOT$CONFFILE.dpkg-bak" \
"$DPKG_ROOT$CONFFILE.dpkg-remove" \
"$DPKG_ROOT$CONFFILE.dpkg-backup"
fi
if [ "$1" = "abort-install" -o "$1" = "abort-upgrade" ] &&
[ -n "$2" ] &&
dpkg --compare-versions -- "$2" le-nl "$LASTVERSION"; then
abort_rm_conffile "$CONFFILE" "$PACKAGE"
fi
;;
*)
debug "$0 rm_conffile not required in $DPKG_MAINTSCRIPT_NAME"
;;
esac
}
prepare_rm_conffile() {
local CONFFILE="$1"
local PACKAGE="$2"
[ -e "$DPKG_ROOT$CONFFILE" ] || return 0
ensure_package_owns_file "$PACKAGE" "$CONFFILE" || return 0
local md5sum old_md5sum
md5sum="$(md5sum "$DPKG_ROOT$CONFFILE" | sed -e 's/ .*//')"
old_md5sum="$(dpkg-query -W -f='${Conffiles}' "$PACKAGE" | \
sed -n -e "\\'^ $CONFFILE ' { s/ obsolete$//; s/.* //; p }")"
if [ "$md5sum" != "$old_md5sum" ]; then
mv -f "$DPKG_ROOT$CONFFILE" "$DPKG_ROOT$CONFFILE.dpkg-backup"
else
mv -f "$DPKG_ROOT$CONFFILE" "$DPKG_ROOT$CONFFILE.dpkg-remove"
fi
}
finish_rm_conffile() {
local CONFFILE="$1"
if [ -e "$DPKG_ROOT$CONFFILE.dpkg-backup" ]; then
echo "Obsolete conffile $DPKG_ROOT$CONFFILE has been modified by you."
echo "Saving as $DPKG_ROOT$CONFFILE.dpkg-bak ..."
mv -f "$DPKG_ROOT$CONFFILE.dpkg-backup" "$DPKG_ROOT$CONFFILE.dpkg-bak"
fi
if [ -e "$DPKG_ROOT$CONFFILE.dpkg-remove" ]; then
echo "Removing obsolete conffile $DPKG_ROOT$CONFFILE ..."
rm -f "$DPKG_ROOT$CONFFILE.dpkg-remove"
fi
}
abort_rm_conffile() {
local CONFFILE="$1"
local PACKAGE="$2"
ensure_package_owns_file "$PACKAGE" "$CONFFILE" || return 0
if [ -e "$DPKG_ROOT$CONFFILE.dpkg-remove" ]; then
echo "Reinstalling $DPKG_ROOT$CONFFILE that was moved away"
mv "$DPKG_ROOT$CONFFILE.dpkg-remove" "$DPKG_ROOT$CONFFILE"
fi
if [ -e "$DPKG_ROOT$CONFFILE.dpkg-backup" ]; then
echo "Reinstalling $DPKG_ROOT$CONFFILE that was backed-up"
mv "$DPKG_ROOT$CONFFILE.dpkg-backup" "$DPKG_ROOT$CONFFILE"
fi
}
##
## Functions to rename a conffile during upgrade
##
mv_conffile() {
local OLDCONFFILE="$1"
local NEWCONFFILE="$2"
local LASTVERSION="$3"
local PACKAGE="$4"
if [ "$LASTVERSION" = "--" ]; then
LASTVERSION=""
PACKAGE="$DPKG_MAINTSCRIPT_PACKAGE${DPKG_MAINTSCRIPT_ARCH:+:$DPKG_MAINTSCRIPT_ARCH}"
fi
if [ "$PACKAGE" = "--" -o -z "$PACKAGE" ]; then
PACKAGE="$DPKG_MAINTSCRIPT_PACKAGE${DPKG_MAINTSCRIPT_ARCH:+:$DPKG_MAINTSCRIPT_ARCH}"
fi
# Skip remaining parameters up to --
while [ "$1" != "--" -a $# -gt 0 ]; do
shift
done
[ $# -gt 0 ] || badusage "missing arguments after --"
shift
[ -n "$PACKAGE" ] || error "couldn't identify the package"
[ -n "$1" ] || error "maintainer script parameters are missing"
[ -n "$DPKG_MAINTSCRIPT_NAME" ] || \
error "environment variable DPKG_MAINTSCRIPT_NAME is required"
[ -n "$DPKG_MAINTSCRIPT_PACKAGE" ] || \
error "environment variable DPKG_MAINTSCRIPT_PACKAGE is required"
[ "${OLDCONFFILE}" != "${OLDCONFFILE#/}" ] || \
error "old-conffile '$OLDCONFFILE' is not an absolute path"
[ "${NEWCONFFILE}" != "${NEWCONFFILE#/}" ] || \
error "new-conffile '$NEWCONFFILE' is not an absolute path"
validate_optional_version "$LASTVERSION"
debug "Executing $0 mv_conffile in $DPKG_MAINTSCRIPT_NAME" \
"of $DPKG_MAINTSCRIPT_PACKAGE"
debug "CONFFILE=$OLDCONFFILE -> $NEWCONFFILE PACKAGE=$PACKAGE" \
"LASTVERSION=$LASTVERSION ACTION=$1 PARAM=$2"
case "$DPKG_MAINTSCRIPT_NAME" in
preinst)
if [ "$1" = "install" -o "$1" = "upgrade" ] && [ -n "$2" ] &&
dpkg --compare-versions -- "$2" le-nl "$LASTVERSION"; then
prepare_mv_conffile "$OLDCONFFILE" "$PACKAGE"
fi
;;
postinst)
if [ "$1" = "configure" ] && [ -n "$2" ] &&
dpkg --compare-versions -- "$2" le-nl "$LASTVERSION"; then
finish_mv_conffile "$OLDCONFFILE" "$NEWCONFFILE" "$PACKAGE"
fi
;;
postrm)
if [ "$1" = "abort-install" -o "$1" = "abort-upgrade" ] &&
[ -n "$2" ] &&
dpkg --compare-versions -- "$2" le-nl "$LASTVERSION"; then
abort_mv_conffile "$OLDCONFFILE" "$PACKAGE"
fi
;;
*)
debug "$0 mv_conffile not required in $DPKG_MAINTSCRIPT_NAME"
;;
esac
}
prepare_mv_conffile() {
local CONFFILE="$1"
local PACKAGE="$2"
[ -e "$DPKG_ROOT$CONFFILE" ] || return 0
ensure_package_owns_file "$PACKAGE" "$CONFFILE" || return 0
local md5sum old_md5sum
md5sum="$(md5sum "$DPKG_ROOT$CONFFILE" | sed -e 's/ .*//')"
old_md5sum="$(dpkg-query -W -f='${Conffiles}' "$PACKAGE" | \
sed -n -e "\\'^ $CONFFILE ' { s/ obsolete$//; s/.* //; p }")"
if [ "$md5sum" = "$old_md5sum" ]; then
mv -f "$DPKG_ROOT$CONFFILE" "$DPKG_ROOT$CONFFILE.dpkg-remove"
fi
}
finish_mv_conffile() {
local OLDCONFFILE="$1"
local NEWCONFFILE="$2"
local PACKAGE="$3"
rm -f "$DPKG_ROOT$OLDCONFFILE.dpkg-remove"
[ -e "$DPKG_ROOT$OLDCONFFILE" ] || return 0
ensure_package_owns_file "$PACKAGE" "$OLDCONFFILE" || return 0
echo "Preserving user changes to $DPKG_ROOT$NEWCONFFILE (renamed from $DPKG_ROOT$OLDCONFFILE)..."
if [ -e "$DPKG_ROOT$NEWCONFFILE" ]; then
mv -f "$DPKG_ROOT$NEWCONFFILE" "$DPKG_ROOT$NEWCONFFILE.dpkg-new"
fi
mv -f "$DPKG_ROOT$OLDCONFFILE" "$DPKG_ROOT$NEWCONFFILE"
}
abort_mv_conffile() {
local CONFFILE="$1"
local PACKAGE="$2"
ensure_package_owns_file "$PACKAGE" "$CONFFILE" || return 0
if [ -e "$DPKG_ROOT$CONFFILE.dpkg-remove" ]; then
echo "Reinstalling $DPKG_ROOT$CONFFILE that was moved away"
mv "$DPKG_ROOT$CONFFILE.dpkg-remove" "$DPKG_ROOT$CONFFILE"
fi
}
##
## Functions to replace a symlink with a directory
##
symlink_to_dir() {
local SYMLINK="$1"
local SYMLINK_TARGET="$2"
local LASTVERSION="$3"
local PACKAGE="$4"
if [ "$LASTVERSION" = "--" ]; then
LASTVERSION=""
PACKAGE="$DPKG_MAINTSCRIPT_PACKAGE${DPKG_MAINTSCRIPT_ARCH:+:$DPKG_MAINTSCRIPT_ARCH}"
fi
if [ "$PACKAGE" = "--" -o -z "$PACKAGE" ]; then
PACKAGE="$DPKG_MAINTSCRIPT_PACKAGE${DPKG_MAINTSCRIPT_ARCH:+:$DPKG_MAINTSCRIPT_ARCH}"
fi
# Skip remaining parameters up to --
while [ "$1" != "--" -a $# -gt 0 ]; do
shift
done
[ $# -gt 0 ] || badusage "missing arguments after --"
shift
[ -n "$DPKG_MAINTSCRIPT_NAME" ] || \
error "environment variable DPKG_MAINTSCRIPT_NAME is required"
[ -n "$DPKG_MAINTSCRIPT_PACKAGE" ] || \
error "environment variable DPKG_MAINTSCRIPT_PACKAGE is required"
[ -n "$PACKAGE" ] || error "cannot identify the package"
[ -n "$SYMLINK" ] || error "symlink parameter is missing"
[ "${SYMLINK#/}" = "$SYMLINK" ] && \
error "symlink pathname is not an absolute path"
[ "${SYMLINK%/}" = "$SYMLINK" ] || \
error "symlink pathname ends with a slash"
[ -n "$SYMLINK_TARGET" ] || error "original symlink target is missing"
[ -n "$1" ] || error "maintainer script parameters are missing"
validate_optional_version "$LASTVERSION"
debug "Executing $0 symlink_to_dir in $DPKG_MAINTSCRIPT_NAME" \
"of $DPKG_MAINTSCRIPT_PACKAGE"
debug "SYMLINK=$SYMLINK -> $SYMLINK_TARGET PACKAGE=$PACKAGE" \
"LASTVERSION=$LASTVERSION ACTION=$1 PARAM=$2"
case "$DPKG_MAINTSCRIPT_NAME" in
preinst)
if [ "$1" = "install" -o "$1" = "upgrade" ] &&
[ -n "$2" ] && [ -h "$DPKG_ROOT$SYMLINK" ] &&
symlink_match "$SYMLINK" "$SYMLINK_TARGET" &&
dpkg --compare-versions -- "$2" le-nl "$LASTVERSION"; then
mv -f "$DPKG_ROOT$SYMLINK" "$DPKG_ROOT${SYMLINK}.dpkg-backup"
fi
;;
postinst)
# We cannot bail depending on the version, as here we only
# know what was the last configured version, and we might
# have been unpacked, then upgraded with an unpack and thus
# never been configured before.
if [ "$1" = "configure" ] &&
[ -h "$DPKG_ROOT${SYMLINK}.dpkg-backup" ] &&
symlink_match "${SYMLINK}.dpkg-backup" "$SYMLINK_TARGET"
then
rm -f "$DPKG_ROOT${SYMLINK}.dpkg-backup"
fi
;;
postrm)
if [ "$1" = "purge" ] && [ -h "$DPKG_ROOT${SYMLINK}.dpkg-backup" ]; then
rm -f "$DPKG_ROOT${SYMLINK}.dpkg-backup"
fi
if [ "$1" = "abort-install" -o "$1" = "abort-upgrade" ] &&
[ -n "$2" ] &&
[ ! -e "$DPKG_ROOT$SYMLINK" ] &&
[ -h "$DPKG_ROOT${SYMLINK}.dpkg-backup" ] &&
symlink_match "${SYMLINK}.dpkg-backup" "$SYMLINK_TARGET" &&
dpkg --compare-versions -- "$2" le-nl "$LASTVERSION"; then
echo "Restoring backup of $DPKG_ROOT$SYMLINK ..."
mv "$DPKG_ROOT${SYMLINK}.dpkg-backup" "$DPKG_ROOT$SYMLINK"
fi
;;
*)
debug "$0 symlink_to_dir not required in $DPKG_MAINTSCRIPT_NAME"
;;
esac
}
##
## Functions to replace a directory with a symlink
##
dir_to_symlink() {
local PATHNAME="${1%/}"
local SYMLINK_TARGET="$2"
local LASTVERSION="$3"
local PACKAGE="$4"
if [ "$LASTVERSION" = "--" ]; then
LASTVERSION=""
PACKAGE="$DPKG_MAINTSCRIPT_PACKAGE${DPKG_MAINTSCRIPT_ARCH:+:$DPKG_MAINTSCRIPT_ARCH}"
fi
if [ "$PACKAGE" = "--" -o -z "$PACKAGE" ]; then
PACKAGE="$DPKG_MAINTSCRIPT_PACKAGE${DPKG_MAINTSCRIPT_ARCH:+:$DPKG_MAINTSCRIPT_ARCH}"
fi
# Skip remaining parameters up to --
while [ "$1" != "--" -a $# -gt 0 ]; do
shift
done
[ $# -gt 0 ] || badusage "missing arguments after --"
shift
[ -n "$DPKG_MAINTSCRIPT_NAME" ] || \
error "environment variable DPKG_MAINTSCRIPT_NAME is required"
[ -n "$DPKG_MAINTSCRIPT_PACKAGE" ] || \
error "environment variable DPKG_MAINTSCRIPT_PACKAGE is required"
[ -n "$PACKAGE" ] || error "cannot identify the package"
[ -n "$PATHNAME" ] || error "directory parameter is missing"
[ "${PATHNAME#/}" = "$PATHNAME" ] && \
error "directory parameter is not an absolute path"
[ -n "$SYMLINK_TARGET" ] || error "new symlink target is missing"
[ -n "$1" ] || error "maintainer script parameters are missing"
validate_optional_version "$LASTVERSION"
debug "Executing $0 dir_to_symlink in $DPKG_MAINTSCRIPT_NAME" \
"of $DPKG_MAINTSCRIPT_PACKAGE"
debug "PATHNAME=$PATHNAME SYMLINK_TARGET=$SYMLINK_TARGET" \
"PACKAGE=$PACKAGE LASTVERSION=$LASTVERSION ACTION=$1 PARAM=$2"
case "$DPKG_MAINTSCRIPT_NAME" in
preinst)
if [ "$1" = "install" -o "$1" = "upgrade" ] &&
[ -n "$2" ] &&
[ ! -h "$DPKG_ROOT$PATHNAME" ] &&
[ -d "$DPKG_ROOT$PATHNAME" ] &&
dpkg --compare-versions -- "$2" le-nl "$LASTVERSION"; then
prepare_dir_to_symlink "$PACKAGE" "$PATHNAME"
fi
;;
postinst)
# We cannot bail depending on the version, as here we only
# know what was the last configured version, and we might
# have been unpacked, then upgraded with an unpack and thus
# never been configured before.
if [ "$1" = "configure" ] &&
[ -d "$DPKG_ROOT${PATHNAME}.dpkg-backup" ] &&
[ ! -h "$DPKG_ROOT$PATHNAME" ] &&
[ -d "$DPKG_ROOT$PATHNAME" ] &&
[ -f "$DPKG_ROOT$PATHNAME/.dpkg-staging-dir" ]; then
finish_dir_to_symlink "$PATHNAME" "$SYMLINK_TARGET"
fi
;;
postrm)
if [ "$1" = "purge" ] &&
[ -d "$DPKG_ROOT${PATHNAME}.dpkg-backup" ]; then
rm -rf "$DPKG_ROOT${PATHNAME}.dpkg-backup"
fi
if [ "$1" = "abort-install" -o "$1" = "abort-upgrade" ] &&
[ -n "$2" ] &&
[ -d "$DPKG_ROOT${PATHNAME}.dpkg-backup" ] &&
[ \( ! -h "$DPKG_ROOT$PATHNAME" -a \
-d "$DPKG_ROOT$PATHNAME" -a \
-f "$DPKG_ROOT$PATHNAME/.dpkg-staging-dir" \) -o \
\( -h "$DPKG_ROOT$PATHNAME" -a \
\( "$(readlink "$DPKG_ROOT$PATHNAME")" = "$SYMLINK_TARGET" -o \
"$(dpkg-realpath "$PATHNAME")" = "$SYMLINK_TARGET" \) \) ] &&
dpkg --compare-versions -- "$2" le-nl "$LASTVERSION"; then
abort_dir_to_symlink "$PATHNAME"
fi
;;
*)
debug "$0 dir_to_symlink not required in $DPKG_MAINTSCRIPT_NAME"
;;
esac
}
prepare_dir_to_symlink()
{
local PACKAGE="$1"
local PATHNAME="$2"
local LINE
# If there are conffiles we should not perform the switch.
dpkg-query -W -f='${Conffiles}\n' "$PACKAGE" | while read -r LINE; do
case "$LINE" in
"$PATHNAME"/*)
error "directory '$PATHNAME' contains conffiles," \
"cannot switch to symlink"
;;
esac
done
# If there are locally created files or files owned by another package
# we should not perform the switch.
export DPKG_MAINTSCRIPT_HELPER_INTERNAL_API="$version"
find "$DPKG_ROOT$PATHNAME" -print0 | \
xargs -0 -n1 "$0" _internal_pkg_must_own_file "$PACKAGE" || \
error "directory '$PATHNAME' contains files not owned by" \
"package $PACKAGE, cannot switch to symlink"
unset DPKG_MAINTSCRIPT_HELPER_INTERNAL_API
# At this point, we know that the directory either contains no files,
# or only non-conffiles owned by the package.
#
# To do the switch we cannot simply replace it with the final symlink
# just yet, because dpkg needs to remove any file present in the old
# package that have disappeared in the new one, and we do not want to
# lose files resolving to the same pathname in the symlink target.
#
# We cannot replace the directory with a staging symlink either,
# because dpkg will update symlinks to their new target.
#
# So we need to create a staging directory, to avoid removing files
# from other packages, and to trap any new files in the directory
# to move them to their correct place later on.
mv -f "$DPKG_ROOT$PATHNAME" "$DPKG_ROOT${PATHNAME}.dpkg-backup"
mkdir "$DPKG_ROOT$PATHNAME"
# Mark it as a staging directory, so that we can track things.
touch "$DPKG_ROOT$PATHNAME/.dpkg-staging-dir"
}
finish_dir_to_symlink()
{
local PATHNAME="$1"
local SYMLINK_TARGET="$2"
# Move the contents of the staging directory to the symlink target,
# as those are all new files installed between this package being
# unpacked and configured.
local ABS_SYMLINK_TARGET
if [ "${SYMLINK_TARGET#/}" = "$SYMLINK_TARGET" ]; then
ABS_SYMLINK_TARGET="$(dirname "$PATHNAME")/$SYMLINK_TARGET"
else
ABS_SYMLINK_TARGET="$SYMLINK_TARGET"
fi
rm "$DPKG_ROOT$PATHNAME/.dpkg-staging-dir"
find "$DPKG_ROOT$PATHNAME" -mindepth 1 -maxdepth 1 -print0 | \
xargs -0 -i% mv -f "%" "$DPKG_ROOT$ABS_SYMLINK_TARGET/"
# Remove the staging directory.
rmdir "$DPKG_ROOT$PATHNAME"
# Do the actual switch.
ln -s "$SYMLINK_TARGET" "$DPKG_ROOT$PATHNAME"
# We are left behind the old files owned by this package in the backup
# directory, just remove it.
rm -rf "$DPKG_ROOT${PATHNAME}.dpkg-backup"
}
abort_dir_to_symlink()
{
local PATHNAME="$1"
echo "Restoring backup of $DPKG_ROOT$PATHNAME ..."
if [ -h "$DPKG_ROOT$PATHNAME" ]; then
rm -f "$DPKG_ROOT$PATHNAME"
else
# The staging directory must be empty, as no other package
# should have been unpacked in between.
rm -f "$DPKG_ROOT$PATHNAME/.dpkg-staging-dir"
rmdir "$DPKG_ROOT$PATHNAME"
fi
mv "$DPKG_ROOT${PATHNAME}.dpkg-backup" "$DPKG_ROOT$PATHNAME"
}
# Common functions
validate_optional_version() {
local VERSION="$1"
if [ -z "$VERSION" ]; then
return
fi
if ! VERSIONCHECK=$(dpkg --validate-version -- "$VERSION" 2>&1); then
error "$VERSIONCHECK"
fi
}
ensure_package_owns_file() {
local PACKAGE="$1"
local FILE="$2"
if ! dpkg-query -L "$PACKAGE" | grep -F -q -x "$FILE"; then
debug "File '$FILE' not owned by package " \
"'$PACKAGE', skipping $command"
return 1
fi
return 0
}
internal_pkg_must_own_file()
{
local PACKAGE="$1"
local FILE="${2##$DPKG_ROOT}"
if [ "$DPKG_MAINTSCRIPT_HELPER_INTERNAL_API" != "$version" ]; then
error "internal API used by external command"
fi
if ! ensure_package_owns_file "$PACKAGE" "$FILE"; then
error "file '$FILE' not owned by package '$PACKAGE'"
fi
return 0
}
symlink_match()
{
local SYMLINK="$1"
local SYMLINK_TARGET="$2"
[ "$(readlink "$DPKG_ROOT$SYMLINK")" = "$SYMLINK_TARGET" ] || \
[ "$(dpkg-realpath "$SYMLINK")" = "$SYMLINK_TARGET" ]
}
usage() {
cat <<END
Usage: $PROGNAME <command> <parameter>... -- <maintainer-script-parameter>...
Commands:
supports <command>
Returns 0 (success) if the given command is supported, 1 otherwise.
rm_conffile <conffile> [<last-version> [<package>]]
Remove obsolete conffile. Must be called in preinst, postinst and
postrm.
mv_conffile <old-conf> <new-conf> [<last-version> [<package>]]
Rename a conffile. Must be called in preinst, postinst and postrm.
symlink_to_dir <pathname> <old-symlink-target> [<last-version> [<package>]]
Replace a symlink with a directory. Must be called in preinst,
postinst and postrm.
dir_to_symlink <pathname> <new-symlink-target> [<last-version> [<package>]]
Replace a directory with a symlink. Must be called in preinst,
postinst and postrm.
help
-?, --help
Show this help message.
--version
Show the version.
END
}
# Main code
set -e
PROGNAME=$(basename "$0")
version="1.20.9"
DPKG_ROOT=${DPKG_ROOT:+$(realpath "$DPKG_ROOT")}
# Remove default root dir.
if [ "$DPKG_ROOT" = "/" ]; then
DPKG_ROOT=""
fi
export DPKG_ROOT
PKGDATADIR_DEFAULT='/usr/share/dpkg'
PKGDATADIR="${DPKG_DATADIR:-$PKGDATADIR_DEFAULT}"
. "$PKGDATADIR/sh/dpkg-error.sh"
setup_colors
command="$1"
[ $# -gt 0 ] || badusage "missing command"
shift
case "$command" in
supports)
case "$1" in
rm_conffile|mv_conffile|symlink_to_dir|dir_to_symlink)
code=0
;;
*)
code=1
;;
esac
if [ -z "$DPKG_MAINTSCRIPT_NAME" ]; then
warning "environment variable DPKG_MAINTSCRIPT_NAME missing"
code=1
fi
if [ -z "$DPKG_MAINTSCRIPT_PACKAGE" ]; then
warning "environment variable DPKG_MAINTSCRIPT_PACKAGE missing"
code=1
fi
exit $code
;;
rm_conffile)
rm_conffile "$@"
;;
mv_conffile)
mv_conffile "$@"
;;
symlink_to_dir)
symlink_to_dir "$@"
;;
dir_to_symlink)
dir_to_symlink "$@"
;;
_internal_pkg_must_own_file)
# This is an internal command, must not be used outside this program.
internal_pkg_must_own_file "$@"
;;
--help|help|-?)
usage
;;
--version)
cat <<END
Debian $PROGNAME version $version.
This is free software; see the GNU General Public License version 2 or
later for copying conditions. There is NO warranty.
END
;;
*)
badusage "command $command is unknown
Hint: upgrading dpkg to a newer version might help."
esac
exit 0
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