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@@ -295,6 +295,115 @@ symlink_to_dir() {
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esac
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}
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+##
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+## Functions to replace a directory with a symlink
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+##
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+dir_to_symlink() {
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+ local PATHNAME="$1"
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+ local SYMLINK_TARGET="$2"
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+ local LASTVERSION="$3"
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+ local PACKAGE="$4"
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+
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+ if [ "$LASTVERSION" = "--" ]; then
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+ LASTVERSION=""
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+ PACKAGE="$DPKG_MAINTSCRIPT_PACKAGE${DPKG_MAINTSCRIPT_ARCH:+:$DPKG_MAINTSCRIPT_ARCH}"
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+ fi
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+ if [ "$PACKAGE" = "--" -o -z "$PACKAGE" ]; then
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+ PACKAGE="$DPKG_MAINTSCRIPT_PACKAGE${DPKG_MAINTSCRIPT_ARCH:+:$DPKG_MAINTSCRIPT_ARCH}"
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+ fi
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+
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+ # Skip remaining parameters up to --
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+ while [ "$1" != "--" -a $# -gt 0 ]; do shift; done
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+ [ $# -gt 0 ] || badusage "missing arguments after --"
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+ shift
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+
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+ [ -n "$DPKG_MAINTSCRIPT_NAME" ] || \
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+ error "environment variable DPKG_MAINTSCRIPT_NAME is required"
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+ [ -n "$PACKAGE" ] || error "cannot identify the package"
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+ [ -n "$PATHNAME" ] || error "directory parameter is missing"
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+ [ -n "$SYMLINK_TARGET" ] || error "new symlink target is missing"
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+ [ -n "$LASTVERSION" ] || error "last version is missing"
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+ [ -n "$1" ] || error "maintainer script parameters are missing"
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+
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+ debug "Executing $0 dir_to_symlink in $DPKG_MAINTSCRIPT_NAME" \
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+ "of $DPKG_MAINTSCRIPT_PACKAGE"
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+ debug "PATHNAME=$PATHNAME SYMLINK_TARGET=$SYMLINK_TARGET" \
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+ "PACKAGE=$PACKAGE LASTVERSION=$LASTVERSION ACTION=$1 PARAM=$2"
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+
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+ case "$DPKG_MAINTSCRIPT_NAME" in
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+ preinst)
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+ if [ "$1" = "install" -o "$1" = "upgrade" ] &&
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+ [ -n "$2" ] && [ -d "$PATHNAME" ] &&
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+ dpkg --compare-versions "$2" le-nl "$LASTVERSION"; then
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+ prepare_dir_to_symlink "$PACKAGE" "$PATHNAME"
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+ fi
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+ ;;
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+ postinst)
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+ if [ "$1" = "configure" ] &&
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+ [ -d "${PATHNAME}.dpkg-backup" ] && [ -h "$PATHNAME" ] &&
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+ [ "$(readlink -f $PATHNAME)" = "$SYMLINK_TARGET" ] &&
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+ dpkg --compare-versions "$2" le-nl "$LASTVERSION"; then
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+ # By now, dpkg will have updated the symlink to point
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+ # to the new location, but we are left behind the old
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+ # files owned by this package in the backup directory,
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+ # just remove it.
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+ rm -rf "${PATHNAME}.dpkg-backup"
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+ fi
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+ ;;
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+ postrm)
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+ if [ "$1" = "purge" ] && [ -d "${PATHNAME}.dpkg-backup" ]; then
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+ rm -rf "${PATHNAME}.dpkg-backup"
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+ fi
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+ if [ "$1" = "abort-install" -o "$1" = "abort-upgrade" ] &&
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+ [ -n "$2" ] &&
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+ [ -d "${PATHNAME}.dpkg-backup" ] && [ -h "$PATHNAME" ] &&
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+ [ "$(readlink -f $PATHNAME)" = "$SYMLINK_TARGET" ] &&
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+ dpkg --compare-versions "$2" le-nl "$LASTVERSION"; then
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+ echo "Restoring backup of $PATHNAME ..."
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+ rm -f "$PATHNAME"
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+ mv "${PATHNAME}.dpkg-backup" "$PATHNAME"
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+ fi
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+ ;;
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+ *)
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+ debug "$0 dir_to_symlink not required in $DPKG_MAINTSCRIPT_NAME"
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+ ;;
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+ esac
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+}
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+
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+prepare_dir_to_symlink()
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+{
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+ local PACKAGE="$1"
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+ local PATHNAME="$2"
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+
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+ # If there are conffiles we should not perform the switch.
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+ if dpkg-query -W -f='${Conffiles}' "$PACKAGE" | \
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+ grep -q "$PATHNAME/."; then
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+ error "directory '$PATHNAME' contains conffiles," \
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+ "cannot switch to symlink"
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+ fi
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+
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+ # If there are locally created files or files owned by another package
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+ # we should not perform the switch.
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+ find "$PATHNAME" -print0 | xargs -0 -n1 sh -c '
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+ package="$1"
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+ file="$2"
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+ if ! dpkg-query -L "$package" | grep -q -x "$file"; then
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+ return 1
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+ fi
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+ return 0
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+ ' subcommand "$PACKAGE" || \
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+ error "directory '$PATHNAME' contains files not owned by" \
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+ "package $PACKAGE, cannot switch to symlink"
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+
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+ # Move the directory aside and make a temporary symlink to reduce the
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+ # time the contents are not available. dpkg will not be able to remove
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+ # the old files from the backup directory after unpack, because it
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+ # will have updated the symlink to point to the new location already,
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+ # we'll remove them ourselves later on.
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+ mv -f "$PATHNAME" "${PATHNAME}.dpkg-backup"
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+ ln -s "${PATHNAME}.dpkg-backup" "$PATHNAME"
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+}
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+
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# Common functions
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ensure_package_owns_file() {
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local PACKAGE="$1"
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@@ -338,6 +447,9 @@ Commands:
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symlink_to_dir <pathname> <old-symlink-target> [<last-version> [<package>]]
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Replace a symlink with a directory. Must be called in preinst,
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postinst and postrm.
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+ dir_to_symlink <pathname> <new-symlink-target> [<last-version> [<package>]]
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+ Replace a directory with a symlink. Must be called in preinst,
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+ postinst and postrm.
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help
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Display this usage information.
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END
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@@ -362,7 +474,7 @@ shift
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case "$command" in
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supports)
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case "$1" in
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- rm_conffile|mv_conffile|symlink_to_dir)
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+ rm_conffile|mv_conffile|symlink_to_dir|dir_to_symlink)
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code=0
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;;
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*)
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@@ -388,6 +500,9 @@ mv_conffile)
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symlink_to_dir)
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symlink_to_dir "$@"
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;;
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+dir_to_symlink)
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+ dir_to_symlink "$@"
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+ ;;
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--help|help|-?)
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usage
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;;
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Guillem Jover