init.sh: Use readlink in pybin()

Use realpath only as a fallback.

Signed-off-by: Leah Rowe <leah@libreboot.org>

include/init.sh

@@ -80,8 +80,7 @@ pybin()
 	# ideally, don't rely on PATH or hardcoded paths if python venv.
 	# use the *real*, direct executable linked to by the venv symlink
 	if [ $venv -gt 0 ] && [ -L "`command -v "$1" 2>/dev/null`" ]; then
-		# realpath isn't posix, but available mostly universally
-		pypath="$(realpath \
+		pypath="$(findpath \
 		    "$(command -v "$1" 2>/dev/null)" 2>/dev/null || :)"
 		[ -e "$pypath" ] && [ ! -d "$pypath" ] && \
 		    [ -x "$pypath" ] && printf "%s\n" "$pypath" && return 0; :

include/lib.sh

@@ -144,6 +144,18 @@ singletree()
 	    return 1
 }
 
+findpath()
+{
+	[ $# -gt 0 ] || err "findpath: No arguments provided"
+	while [ $# -gt 0 ]; do
+		found="`readlink -f "$1" 2>/dev/null`" || return 1; :
+		[ -n "$found" ] || found="`realpath "$1" 2>/dev/null`" || \
+		    return 1; :
+		printf "%s\n" "$found"
+		shift 1
+	done
+}
+
 fx_()
 {
 	fd="`mktemp`" && x_ rm -f "$fd" && x_ touch "$fd"