Author: Andreas Beckmann <anbe@debian.org>
Description: fix detection of shells in aliased locations
 only canonicalize the directory where the shell resides,
 not the shell itself (which may be a symlink, e.g. managed by
 update-alternatives)
Bug-Debian: https://bugs.debian.org/1035820

--- a/update-shells
+++ b/update-shells
@@ -80,7 +80,7 @@ for f in "$TEMPLATE_ETC_FILE" "$PKG_DIR/
 	while IFS='#' read -r line _; do
 		[ -n "$line" ] || continue
 		PKG_SHELLS="$PKG_SHELLS$line#"
-		realshell=$(dirname "$(dpkg-realpath --root "$ROOT" "$line")")/$(basename "$line")
+		realshell=$(dpkg-realpath --root "$ROOT" "$(dirname "$line")")/$(basename "$line")
 		if [ "$line" != "$realshell" ]; then
 			PKG_SHELLS="$PKG_SHELLS$realshell#"
 		fi