[gentoo-portage-dev] [PATCH] dosym: protect Prefix hack from double EPREFIX

[Michał Górny]

Add an additional conditional to the dosym Prefix hack to ensure that
the symlink is not using double Prefix when the ebuild uses ${EPREFIX}
explicitly. This ensures that Portage on Prefix systems is both
compatible with the ebuilds relying on the hack, and using dosym
in the PMS-defined manner.
---
 bin/ebuild-helpers/dosym | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/bin/ebuild-helpers/dosym b/bin/ebuild-helpers/dosym
index 0bc8cc7be..5741da346 100755
--- a/bin/ebuild-helpers/dosym
+++ b/bin/ebuild-helpers/dosym
@@ -1,5 +1,5 @@
 #!/bin/bash
-# Copyright 1999-2012 Gentoo Foundation
+# Copyright 1999-2017 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 
 source "${PORTAGE_BIN_PATH}"/isolated-functions.sh || exit 1
@@ -21,9 +21,12 @@ fi
 
 destdir=${2%/*}
 [[ ! -d ${ED}${destdir} ]] && dodir "${destdir}"
-# when absolute, prefix with offset for Gentoo Prefix
 target="${1}"
-[[ ${target:0:1} == "/" ]] && target="${EPREFIX}${target}"
+# DEPRECATED HACK: when absolute, prefix with offset for Gentoo Prefix
+# (but only if ${EPREFIX} is not there already)
+if [[ ${target:0:1} == "/" && ${target} != "${EPREFIX}"* ]]; then
+	target="${EPREFIX}${target}"
+fi
 ln -snf "${target}" "${ED}${2}"
 
 ret=$?
-- 
2.12.2