prefix.eclass: import from gx86.

1 files changed, 52 insertions, 0 deletions

diff --git a/eclass/prefix.eclass b/eclass/prefix.eclass
new file mode 100644
index 0000000..1f3c4b0
--- /dev/null
+++ b/eclass/prefix.eclass
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+# Copyright 1999-2009 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+# $Id$
+
+# @ECLASS: prefix.eclass
+# @MAINTAINER:
+# Feel free to contact the Prefix team through <prefix@gentoo.org> if
+# you have problems, suggestions or questions.
+# @BLURB: Eclass to provide Prefix functionality
+# @DESCRIPTION:
+# Gentoo Prefix allows users to install into a self defined offset
+# located somewhere in the filesystem.  Prefix ebuilds require
+# additional functions and variables which are defined by this eclass.
+
+# @ECLASS-VARIABLE: EPREFIX
+# @DESCRIPTION:
+# The offset prefix of a Gentoo Prefix installation.  When Gentoo Prefix
+# is not used, ${EPREFIX} should be "".  Prefix Portage sets EPREFIX,
+# hence this eclass has nothing to do here in that case.
+# Note that setting EPREFIX in the environment with Prefix Portage sets
+# Portage into cross-prefix mode.
+if [[ ! ${EPREFIX+set} ]]; then
+	export EPREFIX=''
+fi
+
+
+# @FUNCTION: eprefixify
+# @USAGE: <list of to be eprefixified files>
+# @DESCRIPTION:
+# replaces @GENTOO_PORTAGE_EPREFIX@ with ${EPREFIX} for the given files,
+# dies if no arguments are given, a file does not exist, or changing a
+# file failed.
+eprefixify() {
+	[[ $# -lt 1 ]] && die "at least one argument required"
+
+	einfo "Adjusting to prefix ${EPREFIX:-/}"
+	local x
+	for x in "$@" ; do
+		if [[ -e ${x} ]] ; then
+			ebegin "  ${x##*/}"
+			sed -i -e "s|@GENTOO_PORTAGE_EPREFIX@|${EPREFIX}|g" "${x}"
+			eend $? || die "failed to eprefixify ${x}"
+		else
+			die "${x} does not exist"
+		fi
+	done
+
+	return 0
+}
+
+
+# vim: tw=72: