From 6b4a03f1688e0b76b56f246d200517ce3b274a2e Mon Sep 17 00:00:00 2001
From: Thomas Debesse <dev@illwieckz.net>
Date: Mon, 20 May 2019 21:17:02 +0200
Subject: [PATCH] gamepack-manager: try to compute realpath the portable way

---
 gamepack-manager | 45 ++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 38 insertions(+), 7 deletions(-)

diff --git a/gamepack-manager b/gamepack-manager
index aa427455..f06ccf7a 100755
--- a/gamepack-manager
+++ b/gamepack-manager
@@ -81,6 +81,43 @@ Xonotic         GPL          git     https://gitlab.com/xonotic/netradiant-xonot
 EOF
 }
 
+printRealPath ()
+{
+	if command -v grealpath >/dev/null
+	then
+		grealpath "${1}"
+	elif command -v realpath >/dev/null
+	then
+		realpath "${1}"
+	elif command -v greadlink >/dev/null
+	then
+		# test greadlink first as greadlink has the feature on macos
+		# but readlink only has it on linux, note that it's probably
+		# the same on bsd
+		# note: (g)readlink requires the file to be create first
+		greadlink -f "${1}"
+	elif command -v readlink >/dev/null
+	then
+		# --help and -f options are GNU readlink things
+		if readlink --help >/dev/null 2>&1
+		then
+			readlink -f "${1}"
+		else
+			if ! python -c "import os; print(os.path.realpath('${1}'))"
+			then
+				printf 'ERROR: no known way to compute real path of a file' >&2
+				return 1
+			fi
+		fi
+	fi
+}
+
+if "${mkdir_download}"
+then
+	${MKDIR_P} "${download_dir}"
+	real_download_dir="$(printRealPath "${download_dir}")"
+fi
+
 sanitizeDB () {
 	sed -e 's/#.*//;s/[ \t][ \t][ \t]*/\t/g;s/^[ \t]*//;s/[ \t]*$//' \
 	| grep -v '^$'
@@ -663,16 +700,10 @@ fi
 
 selected_list="$(dedupeList "${selected_list}")"
 
-if "${mkdir_download}"
-then
-	${MKDIR_P} "${download_dir}"
-	real_download_dir="$(readlink -f "${download_dir}")"
-fi
-
 if "${mkdir_install}"
 then
 	${MKDIR_P} "${install_dir}"
-	real_install_dir="$(readlink -f "${install_dir}")"
+	real_install_dir="$(printRealPath "${install_dir}")"
 fi
 
 if "${list_licenses}"
-- 
2.39.2