From 3e4fa5a742dc5194c39b1ed8200b3580fc3f13c4 Mon Sep 17 00:00:00 2001
From: "W. Trevor King" <wking@tremily.us>
Date: Thu, 26 Dec 2013 16:53:02 -0800
Subject: [PATCH] build.sh: Allow readlink for path-canonicalization

Debian doesn't have realpath installed by default [1], so fall back to
the more widely available readlink [2].

[1]: http://packages.debian.org/unstable/utils/realpath
[2]: http://www.gnu.org/software/coreutils/manual/html_node/readlink-invocation.html
---
 build.sh | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/build.sh b/build.sh
index 9c72780..a21392b 100755
--- a/build.sh
+++ b/build.sh
@@ -54,6 +54,16 @@ die()
 	exit 1
 }
 
+REALPATH="${REALPATH:-$(command -v realpath)}"
+if [ -z "${REALPATH}" ]; then
+	READLINK="${READLINK:-$(command -v readlink)}"
+	if [ -n "${READLINK}" ]; then
+		REALPATH="${READLINK} -f"
+	else
+		die "need realpath or readlink to canonicalize paths"
+	fi
+fi
+
 STAGE3_IMAGES=$(docker images "${NAMESPACE}/gentoo")
 STAGE3_MATCHES=$(echo "${STAGE3_IMAGES}" | grep "${DATE}")
 if [ -z "${STAGE3_MATCHES}" ]; then
@@ -97,7 +107,7 @@ fi
 docker tag -f "${NAMESPACE}/portage-import:${DATE}" "${NAMESPACE}/portage-import:latest" || die "failed to tag"
 
 # extract Busybox for the portage image
-THIS_DIR=$(dirname $(realpath $0))
+THIS_DIR=$(dirname $($REALPATH $0))
 CONTAINER="${NAMESPACE}-gentoo-${DATE}-extract-busybox"
 docker run -name "${CONTAINER}" -v "${THIS_DIR}/portage/":/tmp "${NAMESPACE}/gentoo:${DATE}" cp /bin/busybox /tmp/
 docker rm "${CONTAINER}"
-- 
2.26.2