From ab46499322311c1faa710c63d0a5339e49a9061a Mon Sep 17 00:00:00 2001
From: Arfrever Frehtes Taifersar Arahesis <Arfrever@Apache.Org>
Date: Wed, 26 Sep 2012 22:31:20 +0200
Subject: [PATCH] Add eapi.sh with ___eapi_*() functions and use these
 functions in other files.

---
 bin/eapi.sh                     | 113 +++++++++++++++++++++++
 bin/ebuild-helpers/dobin        |   7 +-
 bin/ebuild-helpers/dodir        |   7 +-
 bin/ebuild-helpers/dodoc        |  21 ++---
 bin/ebuild-helpers/doexe        |   7 +-
 bin/ebuild-helpers/dohard       |  19 ++--
 bin/ebuild-helpers/doheader     |   8 +-
 bin/ebuild-helpers/doinfo       |   7 +-
 bin/ebuild-helpers/doins        |  18 ++--
 bin/ebuild-helpers/dolib        |   7 +-
 bin/ebuild-helpers/doman        |   7 +-
 bin/ebuild-helpers/domo         |   7 +-
 bin/ebuild-helpers/dosbin       |   7 +-
 bin/ebuild-helpers/dosed        |  19 ++--
 bin/ebuild-helpers/dosym        |   5 +-
 bin/ebuild-helpers/ecompressdir |   7 +-
 bin/ebuild-helpers/fowners      |   5 +-
 bin/ebuild-helpers/fperms       |   7 +-
 bin/ebuild-helpers/newins       |  17 ++--
 bin/ebuild-helpers/prepall      |   7 +-
 bin/ebuild-helpers/prepalldocs  |  17 ++--
 bin/ebuild-helpers/prepallinfo  |   7 +-
 bin/ebuild-helpers/prepallman   |   9 +-
 bin/ebuild-helpers/prepallstrip |   9 +-
 bin/ebuild-helpers/prepinfo     |   9 +-
 bin/ebuild-helpers/preplib      |   7 +-
 bin/ebuild-helpers/prepman      |   9 +-
 bin/ebuild-helpers/prepstrip    |   5 +-
 bin/ebuild.sh                   |  32 +++----
 bin/isolated-functions.sh       |  17 ++--
 bin/misc-functions.sh           |  43 +++++----
 bin/phase-functions.sh          |  53 +++++------
 bin/phase-helpers.sh            | 155 +++++++++++++++-----------------
 bin/save-ebuild-env.sh          |   9 +-
 34 files changed, 386 insertions(+), 297 deletions(-)
 create mode 100644 bin/eapi.sh

diff --git a/bin/eapi.sh b/bin/eapi.sh
new file mode 100644
index 000000000..a561c1cf8
--- /dev/null
+++ b/bin/eapi.sh
@@ -0,0 +1,113 @@
+#!/bin/bash
+# Copyright 2012 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+# PHASES
+
+___eapi_has_pkg_pretend() {
+	[[ ! ${1-${EAPI}} =~ ^(0|1|2|3)$ ]]
+}
+
+___eapi_has_src_prepare() {
+	[[ ! ${1-${EAPI}} =~ ^(0|1)$ ]]
+}
+
+___eapi_has_src_configure() {
+	[[ ! ${1-${EAPI}} =~ ^(0|1)$ ]]
+}
+
+___eapi_default_src_test_disables_parallel_jobs() {
+	[[ ${1-${EAPI}} =~ ^(0|1|2|3|4|4-python|4-slot-abi)$ ]]
+}
+
+___eapi_has_S_WORKDIR_fallback() {
+	[[ ${1-${EAPI}} =~ ^(0|1|2|3)$ ]]
+}
+
+# VARIABLES
+
+___eapi_has_prefix_variables() {
+	[[ ! ${1-${EAPI}} =~ ^(0|1|2)$ || " ${FEATURES} " == *" force-prefix "* ]]
+}
+
+___eapi_has_HDEPEND() {
+	[[ ${1-${EAPI}} =~ ^(5-hdepend)$ ]]
+}
+
+___eapi_has_RDEPEND_DEPEND_fallback() {
+	[[ ${1-${EAPI}} =~ ^(0|1|2|3)$ ]]
+}
+
+# HELPERS PRESENCE
+
+___eapi_has_dohard() {
+	[[ ${1-${EAPI}} =~ ^(0|1|2|3)$ ]]
+}
+
+___eapi_has_dosed() {
+	[[ ${1-${EAPI}} =~ ^(0|1|2|3)$ ]]
+}
+
+___eapi_has_docompress() {
+	[[ ! ${1-${EAPI}} =~ ^(0|1|2|3)$ ]]
+}
+
+___eapi_has_nonfatal() {
+	[[ ! ${1-${EAPI}} =~ ^(0|1|2|3)$ ]]
+}
+
+___eapi_has_doheader() {
+	[[ ! ${1-${EAPI}} =~ ^(0|1|2|3|4|4-python|4-slot-abi)$ ]]
+}
+
+___eapi_has_usex() {
+	[[ ! ${1-${EAPI}} =~ ^(0|1|2|3|4|4-python|4-slot-abi)$ ]]
+}
+
+# HELPERS BEHAVIOR
+
+___eapi_best_version_and_has_version_support_--host-root() {
+	[[ ! ${1-${EAPI}} =~ ^(0|1|2|3|4|4-python|4-slot-abi)$ ]]
+}
+
+___eapi_unpack_supports_xz() {
+	[[ ! ${1-${EAPI}} =~ ^(0|1|2)$ ]]
+}
+
+___eapi_econf_passes_--disable-dependency-tracking() {
+	[[ ! ${1-${EAPI}} =~ ^(0|1|2|3)$ ]]
+}
+
+___eapi_econf_passes_--disable-silent-rules() {
+	[[ ! ${1-${EAPI}} =~ ^(0|1|2|3|4|4-python|4-slot-abi)$ ]]
+}
+
+___eapi_use_enable_and_use_with_support_empty_third_argument() {
+	[[ ! ${1-${EAPI}} =~ ^(0|1|2|3)$ ]]
+}
+
+___eapi_dodoc_supports_-r() {
+	[[ ! ${1-${EAPI}} =~ ^(0|1|2|3)$ ]]
+}
+
+___eapi_doins_and_newins_preserve_symlinks() {
+	[[ ! ${1-${EAPI}} =~ ^(0|1|2|3)$ ]]
+}
+
+___eapi_newins_supports_reading_from_standard_input() {
+	[[ ! ${1-${EAPI}} =~ ^(0|1|2|3|4|4-python|4-slot-abi)$ ]]
+}
+
+___eapi_helpers_can_die() {
+	[[ ! ${1-${EAPI}} =~ ^(0|1|2|3)$ ]]
+}
+
+___eapi_disallows_helpers_in_global_scope() {
+	[[ ${1-${EAPI}} =~ ^(4-python|5-progress)$ ]]
+}
+
+# OTHERS
+
+___eapi_enables_globstar() {
+	[[ ${1-${EAPI}} =~ ^(4-python|5-progress)$ ]]
+}
diff --git a/bin/ebuild-helpers/dobin b/bin/ebuild-helpers/dobin
index 06ae0c779..0ba1eb0c4 100755
--- a/bin/ebuild-helpers/dobin
+++ b/bin/ebuild-helpers/dobin
@@ -1,5 +1,5 @@
 #!/bin/bash
-# Copyright 1999-2011 Gentoo Foundation
+# Copyright 1999-2012 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 
 source "${PORTAGE_BIN_PATH:-/usr/lib/portage/bin}"/isolated-functions.sh
@@ -9,8 +9,9 @@ if [[ $# -lt 1 ]] ; then
 	exit 1
 fi
 
-[[ " ${FEATURES} " == *" force-prefix "* ]] || \
-	case "$EAPI" in 0|1|2) ED=${D} ;; esac
+if ! ___eapi_has_prefix_variables; then
+	ED=${D}
+fi
 
 if [[ ! -d ${ED}${DESTTREE}/bin ]] ; then
 	install -d "${ED}${DESTTREE}/bin" || { __helpers_die "${0##*/}: failed to install ${ED}${DESTTREE}/bin"; exit 2; }
diff --git a/bin/ebuild-helpers/dodir b/bin/ebuild-helpers/dodir
index c8f763deb..e03ba9a58 100755
--- a/bin/ebuild-helpers/dodir
+++ b/bin/ebuild-helpers/dodir
@@ -1,11 +1,12 @@
 #!/bin/bash
-# Copyright 1999-2011 Gentoo Foundation
+# Copyright 1999-2012 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 
 source "${PORTAGE_BIN_PATH:-/usr/lib/portage/bin}"/isolated-functions.sh
 
-[[ " ${FEATURES} " == *" force-prefix "* ]] || \
-	case "$EAPI" in 0|1|2) ED=${D} ;; esac
+if ! ___eapi_has_prefix_variables; then
+	ED=${D}
+fi
 
 install -d ${DIROPTIONS} "${@/#/${ED}/}"
 ret=$?
diff --git a/bin/ebuild-helpers/dodoc b/bin/ebuild-helpers/dodoc
index 2b0533feb..bba790384 100755
--- a/bin/ebuild-helpers/dodoc
+++ b/bin/ebuild-helpers/dodoc
@@ -2,16 +2,12 @@
 # Copyright 1999-2012 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 
-case "${EAPI}" in
-	0|1|2|3)
-		;;
-	*)
-		exec \
-		env \
-		__PORTAGE_HELPER="dodoc" \
-		doins "$@"
-		;;
-esac
+if ___eapi_dodoc_supports_-r; then
+	exec \
+	env \
+	__PORTAGE_HELPER="dodoc" \
+	doins "$@"
+fi
 
 source "${PORTAGE_BIN_PATH:-/usr/lib/portage/bin}"/isolated-functions.sh
 
@@ -20,8 +16,9 @@ if [ $# -lt 1 ] ; then
 	exit 1 	
 fi
 
-[[ " ${FEATURES} " == *" force-prefix "* ]] || \
-	case "$EAPI" in 0|1|2) ED=${D} ;; esac
+if ! ___eapi_has_prefix_variables; then
+	ED=${D}
+fi
 
 dir="${ED}usr/share/doc/${PF}/${_E_DOCDESTTREE_}"
 if [ ! -d "${dir}" ] ; then
diff --git a/bin/ebuild-helpers/doexe b/bin/ebuild-helpers/doexe
index efbf638fc..aa050e9ed 100755
--- a/bin/ebuild-helpers/doexe
+++ b/bin/ebuild-helpers/doexe
@@ -1,5 +1,5 @@
 #!/bin/bash
-# Copyright 1999-2011 Gentoo Foundation
+# Copyright 1999-2012 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 
 source "${PORTAGE_BIN_PATH:-/usr/lib/portage/bin}"/isolated-functions.sh
@@ -9,8 +9,9 @@ if [[ $# -lt 1 ]] ; then
 	exit 1
 fi
 
-[[ " ${FEATURES} " == *" force-prefix "* ]] || \
-	case "$EAPI" in 0|1|2) ED=${D} ;; esac
+if ! ___eapi_has_prefix_variables; then
+	ED=${D}
+fi
 
 if [[ ! -d ${ED}${_E_EXEDESTTREE_} ]] ; then
 	install -d "${ED}${_E_EXEDESTTREE_}"
diff --git a/bin/ebuild-helpers/dohard b/bin/ebuild-helpers/dohard
index 6ae93d240..e0a44faf1 100755
--- a/bin/ebuild-helpers/dohard
+++ b/bin/ebuild-helpers/dohard
@@ -2,22 +2,21 @@
 # Copyright 1999-2012 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 
-case "${EAPI}" in
-	0|1|2|3)
-		;;
-	*)
-		die "'${0##*/}' has been banned for EAPI '$EAPI'"
-		exit 1
-		;;
-esac
+source "${PORTAGE_BIN_PATH:-/usr/lib/portage/bin}"/isolated-functions.sh
+
+if ! ___eapi_has_dohard; then
+	die "'${0##*/}' has been banned for EAPI '$EAPI'"
+	exit 1
+fi
 
 if [[ $# -ne 2 ]] ; then
 	echo "$0: two arguments needed" 1>&2
 	exit 1
 fi
 
-[[ " ${FEATURES} " == *" force-prefix "* ]] || \
-	case "$EAPI" in 0|1|2) ED=${D} ;; esac
+if ! ___eapi_has_prefix_variables; then
+	ED=${D}
+fi
 
 destdir=${2%/*}
 [[ ! -d ${ED}${destdir} ]] && dodir "${destdir}"
diff --git a/bin/ebuild-helpers/doheader b/bin/ebuild-helpers/doheader
index db3a02d09..37953658b 100755
--- a/bin/ebuild-helpers/doheader
+++ b/bin/ebuild-helpers/doheader
@@ -4,11 +4,9 @@
 
 source "${PORTAGE_BIN_PATH:-/usr/lib/portage/bin}"/isolated-functions.sh
 
-case "${EAPI}" in
-	0|1|2|3|4|4-python|4-slot-abi)
-		die "${0##*/} is not supported in EAPI ${EAPI}"
-		;;
-esac
+if ! ___eapi_has_doheader; then
+	die "${0##*/} is not supported in EAPI ${EAPI}"
+fi
 
 if [[ $# -lt 1 ]] || [[ $1 == -r && $# -lt 2 ]] ; then
 	__helpers_die "${0##*/}: at least one argument needed"
diff --git a/bin/ebuild-helpers/doinfo b/bin/ebuild-helpers/doinfo
index e4ccc90d9..355047f73 100755
--- a/bin/ebuild-helpers/doinfo
+++ b/bin/ebuild-helpers/doinfo
@@ -1,5 +1,5 @@
 #!/bin/bash
-# Copyright 1999-2011 Gentoo Foundation
+# Copyright 1999-2012 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 
 source "${PORTAGE_BIN_PATH:-/usr/lib/portage/bin}"/isolated-functions.sh
@@ -9,8 +9,9 @@ if [[ -z $1 ]] ; then
 	exit 1 	
 fi
 
-[[ " ${FEATURES} " == *" force-prefix "* ]] || \
-	case "$EAPI" in 0|1|2) ED=${D} ;; esac
+if ! ___eapi_has_prefix_variables; then
+	ED=${D}
+fi
 
 if [[ ! -d ${ED}usr/share/info ]] ; then
 	install -d "${ED}usr/share/info" || { __helpers_die "${0##*/}: failed to install ${ED}usr/share/info"; exit 1; }
diff --git a/bin/ebuild-helpers/doins b/bin/ebuild-helpers/doins
index c534f3f39..4679e83a9 100755
--- a/bin/ebuild-helpers/doins
+++ b/bin/ebuild-helpers/doins
@@ -29,8 +29,9 @@ else
 	DOINSRECUR=n
 fi
 
-[[ " ${FEATURES} " == *" force-prefix "* ]] || \
-	case "$EAPI" in 0|1|2) export ED="${D}" ;; esac
+if ! ___eapi_has_prefix_variables; then
+	export ED="${D}"
+fi
 
 if [[ ${INSDESTTREE#${ED}} != "${INSDESTTREE}" ]]; then
 	__vecho "-------------------------------------------------------" 1>&2
@@ -41,14 +42,11 @@ if [[ ${INSDESTTREE#${ED}} != "${INSDESTTREE}" ]]; then
 	exit 1
 fi
 
-case "$EAPI" in
-	0|1|2|3)
-		PRESERVE_SYMLINKS=n
-		;;
-	*)
-		PRESERVE_SYMLINKS=y
-		;;
-esac
+if ___eapi_doins_and_newins_preserve_symlinks; then
+	PRESERVE_SYMLINKS=y
+else
+	PRESERVE_SYMLINKS=n
+fi
 
 export TMP=$T/.doins_tmp
 # Use separate directories to avoid potential name collisions.
diff --git a/bin/ebuild-helpers/dolib b/bin/ebuild-helpers/dolib
index 402965de7..fd92d7f03 100755
--- a/bin/ebuild-helpers/dolib
+++ b/bin/ebuild-helpers/dolib
@@ -1,11 +1,12 @@
 #!/bin/bash
-# Copyright 1999-2011 Gentoo Foundation
+# Copyright 1999-2012 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 
 source "${PORTAGE_BIN_PATH:-/usr/lib/portage/bin}"/isolated-functions.sh
 
-[[ " ${FEATURES} " == *" force-prefix "* ]] || \
-	case "$EAPI" in 0|1|2) ED=${D} ;; esac
+if ! ___eapi_has_prefix_variables; then
+	ED=${D}
+fi
 
 # Setup ABI cruft
 LIBDIR_VAR="LIBDIR_${ABI}"
diff --git a/bin/ebuild-helpers/doman b/bin/ebuild-helpers/doman
index c10296b34..d6808597a 100755
--- a/bin/ebuild-helpers/doman
+++ b/bin/ebuild-helpers/doman
@@ -1,5 +1,5 @@
 #!/bin/bash
-# Copyright 1999-2011 Gentoo Foundation
+# Copyright 1999-2012 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 
 source "${PORTAGE_BIN_PATH:-/usr/lib/portage/bin}"/isolated-functions.sh
@@ -9,8 +9,9 @@ if [[ $# -lt 1 ]] ; then
 	exit 1
 fi
 
-[[ " ${FEATURES} " == *" force-prefix "* ]] || \
-	case "$EAPI" in 0|1|2) ED=${D} ;; esac
+if ! ___eapi_has_prefix_variables; then
+	ED=${D}
+fi
 
 i18n=""
 
diff --git a/bin/ebuild-helpers/domo b/bin/ebuild-helpers/domo
index 840b2de4c..9a8dda38a 100755
--- a/bin/ebuild-helpers/domo
+++ b/bin/ebuild-helpers/domo
@@ -1,5 +1,5 @@
 #!/bin/bash
-# Copyright 1999-2011 Gentoo Foundation
+# Copyright 1999-2012 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 
 source "${PORTAGE_BIN_PATH:-/usr/lib/portage/bin}"/isolated-functions.sh
@@ -10,8 +10,9 @@ if [ ${mynum} -lt 1 ] ; then
 	exit 1
 fi
 
-[[ " ${FEATURES} " == *" force-prefix "* ]] || \
-	case "$EAPI" in 0|1|2) ED=${D} ;; esac
+if ! ___eapi_has_prefix_variables; then
+	ED=${D}
+fi
 
 if [ ! -d "${ED}${DESTTREE}/share/locale" ] ; then
 	install -d "${ED}${DESTTREE}/share/locale/"
diff --git a/bin/ebuild-helpers/dosbin b/bin/ebuild-helpers/dosbin
index edc458465..361ca83ca 100755
--- a/bin/ebuild-helpers/dosbin
+++ b/bin/ebuild-helpers/dosbin
@@ -1,5 +1,5 @@
 #!/bin/bash
-# Copyright 1999-2011 Gentoo Foundation
+# Copyright 1999-2012 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 
 source "${PORTAGE_BIN_PATH:-/usr/lib/portage/bin}"/isolated-functions.sh
@@ -9,8 +9,9 @@ if [[ $# -lt 1 ]] ; then
 	exit 1
 fi
 
-[[ " ${FEATURES} " == *" force-prefix "* ]] || \
-	case "$EAPI" in 0|1|2) ED=${D} ;; esac
+if ! ___eapi_has_prefix_variables; then
+	ED=${D}
+fi
 
 if [[ ! -d ${ED}${DESTTREE}/sbin ]] ; then
 	install -d "${ED}${DESTTREE}/sbin" || { __helpers_die "${0##*/}: failed to install ${ED}${DESTTREE}/sbin"; exit 2; }
diff --git a/bin/ebuild-helpers/dosed b/bin/ebuild-helpers/dosed
index 24ec20587..7db062963 100755
--- a/bin/ebuild-helpers/dosed
+++ b/bin/ebuild-helpers/dosed
@@ -2,22 +2,21 @@
 # Copyright 1999-2012 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 
-case "${EAPI}" in
-	0|1|2|3)
-		;;
-	*)
-		die "'${0##*/}' has been banned for EAPI '$EAPI'"
-		exit 1
-		;;
-esac
+source "${PORTAGE_BIN_PATH:-/usr/lib/portage/bin}"/isolated-functions.sh
+
+if ! ___eapi_has_dosed; then
+	die "'${0##*/}' has been banned for EAPI '$EAPI'"
+	exit 1
+fi
 
 if [[ $# -lt 1 ]] ; then
 	echo "!!! ${0##*/}: at least one argument needed" >&2
 	exit 1
 fi
 
-[[ " ${FEATURES} " == *" force-prefix "* ]] || \
-	case "$EAPI" in 0|1|2) ED=${D} ;; esac
+if ! ___eapi_has_prefix_variables; then
+	ED=${D}
+fi
 
 ret=0
 file_found=0
diff --git a/bin/ebuild-helpers/dosym b/bin/ebuild-helpers/dosym
index 34637c2f7..649b100de 100755
--- a/bin/ebuild-helpers/dosym
+++ b/bin/ebuild-helpers/dosym
@@ -9,8 +9,9 @@ if [[ $# -ne 2 ]] ; then
 	exit 1
 fi
 
-[[ " ${FEATURES} " == *" force-prefix "* ]] || \
-	case "$EAPI" in 0|1|2) ED=${D} ;; esac
+if ! ___eapi_has_prefix_variables; then
+	ED=${D}
+fi
 
 if [[ ${2} == */ ]] || \
 	[[ -d ${ED}${2} && ! -L ${ED}${2} ]] ; then
diff --git a/bin/ebuild-helpers/ecompressdir b/bin/ebuild-helpers/ecompressdir
index 097ade2bc..75f3e3a25 100755
--- a/bin/ebuild-helpers/ecompressdir
+++ b/bin/ebuild-helpers/ecompressdir
@@ -1,5 +1,5 @@
 #!/bin/bash
-# Copyright 1999-2011 Gentoo Foundation
+# Copyright 1999-2012 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 
 source "${PORTAGE_BIN_PATH:-/usr/lib/portage/bin}"/helper-functions.sh
@@ -9,8 +9,9 @@ if [[ -z $1 ]] ; then
 	exit 1
 fi
 
-[[ " ${FEATURES} " == *" force-prefix "* ]] || \
-	case "$EAPI" in 0|1|2) ED=${D} EPREFIX= ;; esac
+if ! ___eapi_has_prefix_variables; then
+	ED=${D} EPREFIX=
+fi
 
 case $1 in
 	--ignore)
diff --git a/bin/ebuild-helpers/fowners b/bin/ebuild-helpers/fowners
index 5b93fd3c3..b664ec766 100755
--- a/bin/ebuild-helpers/fowners
+++ b/bin/ebuild-helpers/fowners
@@ -4,8 +4,9 @@
 
 source "${PORTAGE_BIN_PATH:-/usr/lib/portage/bin}"/isolated-functions.sh
 
-[[ " ${FEATURES} " == *" force-prefix "* ]] || \
-	case "$EAPI" in 0|1|2) EPREFIX= ED=${D} ;; esac
+if ! ___eapi_has_prefix_variables; then
+	EPREFIX= ED=${D}
+fi
 
 # we can't prefix all arguments because
 # chown takes random options
diff --git a/bin/ebuild-helpers/fperms b/bin/ebuild-helpers/fperms
index 668e905a2..d854ebbdf 100755
--- a/bin/ebuild-helpers/fperms
+++ b/bin/ebuild-helpers/fperms
@@ -1,11 +1,12 @@
 #!/bin/bash
-# Copyright 1999-2011 Gentoo Foundation
+# Copyright 1999-2012 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 
 source "${PORTAGE_BIN_PATH:-/usr/lib/portage/bin}"/isolated-functions.sh
 
-[[ " ${FEATURES} " == *" force-prefix "* ]] || \
-	case "$EAPI" in 0|1|2) ED=${D} ;; esac
+if ! ___eapi_has_prefix_variables; then
+	ED=${D}
+fi
 
 # we can't prefix all arguments because
 # chmod takes random options
diff --git a/bin/ebuild-helpers/newins b/bin/ebuild-helpers/newins
index 20c68a1e2..3538f7060 100755
--- a/bin/ebuild-helpers/newins
+++ b/bin/ebuild-helpers/newins
@@ -15,10 +15,9 @@ fi
 	eqawarn "QA Notice: ${helper} called with more than 2 arguments: ${@:3}"
 
 stdin=
-case "${EAPI}" in
-	0|1|2|3|4|4-python|4-slot-abi) ;;
-	*) [[ $1 = "-" ]] && stdin=yes ;;
-esac
+if ___eapi_newins_supports_reading_from_standard_input && [[ $1 == "-" ]]; then
+	stdin=yes
+fi
 
 rm -rf "${T}/$2"
 
@@ -37,13 +36,9 @@ else
 
 	cp_args="-f"
 	if [[ ${helper} == newins ]] ; then
-		case "${EAPI}" in
-			0|1|2|3)
-				;;
-			*)
-				cp_args+=" -P"
-				;;
-		esac
+		if ___eapi_doins_and_newins_preserve_symlinks; then
+			cp_args+=" -P"
+		fi
 	fi
 
 	cp ${cp_args} "$1" "${T}/$2"
diff --git a/bin/ebuild-helpers/prepall b/bin/ebuild-helpers/prepall
index 49e646cd2..fb5c2db55 100755
--- a/bin/ebuild-helpers/prepall
+++ b/bin/ebuild-helpers/prepall
@@ -1,11 +1,12 @@
 #!/bin/bash
-# Copyright 1999-2011 Gentoo Foundation
+# Copyright 1999-2012 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 
 source "${PORTAGE_BIN_PATH:-/usr/lib/portage/bin}"/isolated-functions.sh
 
-[[ " ${FEATURES} " == *" force-prefix "* ]] || \
-	case "$EAPI" in 0|1|2) ED=${D} ;; esac
+if ! ___eapi_has_prefix_variables; then
+	ED=${D}
+fi
 
 if has chflags $FEATURES ; then
 	# Save all the file flags for restoration at the end of prepall.
diff --git a/bin/ebuild-helpers/prepalldocs b/bin/ebuild-helpers/prepalldocs
index 50b0c7070..b76f08439 100755
--- a/bin/ebuild-helpers/prepalldocs
+++ b/bin/ebuild-helpers/prepalldocs
@@ -4,21 +4,18 @@
 
 source "${PORTAGE_BIN_PATH:-/usr/lib/portage/bin}"/isolated-functions.sh
 
-case "${EAPI}" in
-	0|1|2|3)
-		;;
-	*)
-		die "'${0##*/}' has been banned for EAPI '$EAPI'"
-		exit 1
-		;;
-esac
+if ! ___eapi_has_docompress; then
+	die "'${0##*/}' has been banned for EAPI '$EAPI'"
+	exit 1
+fi
 
 if [[ -n $1 ]] ; then
 	__vecho "${0##*/}: invalid usage; takes no arguments" 1>&2
 fi
 
-[[ " ${FEATURES} " == *" force-prefix "* ]] || \
-	case "$EAPI" in 0|1|2) ED=${D} ;; esac
+if ! ___eapi_has_prefix_variables; then
+	ED=${D}
+fi
 
 [[ -d ${ED}usr/share/doc ]] || exit 0
 
diff --git a/bin/ebuild-helpers/prepallinfo b/bin/ebuild-helpers/prepallinfo
index db9bbfacb..1a2027580 100755
--- a/bin/ebuild-helpers/prepallinfo
+++ b/bin/ebuild-helpers/prepallinfo
@@ -1,11 +1,12 @@
 #!/bin/bash
-# Copyright 1999-2011 Gentoo Foundation
+# Copyright 1999-2012 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 
 source "${PORTAGE_BIN_PATH:-/usr/lib/portage/bin}"/isolated-functions.sh
 
-[[ " ${FEATURES} " == *" force-prefix "* ]] || \
-	case "$EAPI" in 0|1|2) ED=${D} ;; esac
+if ! ___eapi_has_prefix_variables; then
+	ED=${D}
+fi
 
 [[ -d ${ED}usr/share/info ]] || exit 0
 
diff --git a/bin/ebuild-helpers/prepallman b/bin/ebuild-helpers/prepallman
index dee1c7236..7c78324cd 100755
--- a/bin/ebuild-helpers/prepallman
+++ b/bin/ebuild-helpers/prepallman
@@ -1,14 +1,15 @@
 #!/bin/bash
-# Copyright 1999-2011 Gentoo Foundation
+# Copyright 1999-2012 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 
 source "${PORTAGE_BIN_PATH:-/usr/lib/portage/bin}"/isolated-functions.sh
 
 # replaced by controllable compression in EAPI 4
-has "${EAPI}" 0 1 2 3 || exit 0
+___eapi_has_docompress && exit 0
 
-[[ " ${FEATURES} " == *" force-prefix "* ]] || \
-	case "$EAPI" in 0|1|2) ED=${D} ;; esac
+if ! ___eapi_has_prefix_variables; then
+	ED=${D}
+fi
 
 ret=0
 
diff --git a/bin/ebuild-helpers/prepallstrip b/bin/ebuild-helpers/prepallstrip
index 28320d975..1aa6686cd 100755
--- a/bin/ebuild-helpers/prepallstrip
+++ b/bin/ebuild-helpers/prepallstrip
@@ -1,8 +1,11 @@
 #!/bin/bash
-# Copyright 1999-2011 Gentoo Foundation
+# Copyright 1999-2012 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 
-[[ " ${FEATURES} " == *" force-prefix "* ]] || \
-	case "$EAPI" in 0|1|2) ED=${D} ;; esac
+source "${PORTAGE_BIN_PATH:-/usr/lib/portage/bin}"/isolated-functions.sh
+
+if ! ___eapi_has_prefix_variables; then
+	ED=${D}
+fi
 
 exec prepstrip "${ED}"
diff --git a/bin/ebuild-helpers/prepinfo b/bin/ebuild-helpers/prepinfo
index e213f32d1..5afc18a71 100755
--- a/bin/ebuild-helpers/prepinfo
+++ b/bin/ebuild-helpers/prepinfo
@@ -1,11 +1,12 @@
 #!/bin/bash
-# Copyright 1999-2011 Gentoo Foundation
+# Copyright 1999-2012 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 
 source "${PORTAGE_BIN_PATH:-/usr/lib/portage/bin}"/isolated-functions.sh
 
-[[ " ${FEATURES} " == *" force-prefix "* ]] || \
-	case "$EAPI" in 0|1|2) ED=${D} ;; esac
+if ! ___eapi_has_prefix_variables; then
+	ED=${D}
+fi
 
 if [[ -z $1 ]] ; then
 	infodir="/usr/share/info"
@@ -33,5 +34,5 @@ find "${ED}${infodir}" -type d -print0 | while read -r -d $'\0' x ; do
 	rm -f "${x}"/dir{,.info}{,.gz,.bz2}
 done
 
-has "${EAPI}" 0 1 2 3 || exit 0
+___eapi_has_docompress && exit 0
 exec ecompressdir --queue "${infodir}"
diff --git a/bin/ebuild-helpers/preplib b/bin/ebuild-helpers/preplib
index 6e91cf33d..764261d98 100755
--- a/bin/ebuild-helpers/preplib
+++ b/bin/ebuild-helpers/preplib
@@ -1,13 +1,14 @@
 #!/bin/bash
-# Copyright 1999-2011 Gentoo Foundation
+# Copyright 1999-2012 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 
 source "${PORTAGE_BIN_PATH:-/usr/lib/portage/bin}"/isolated-functions.sh
 
 eqawarn "QA Notice: Deprecated call to 'preplib'"
 
-[[ " ${FEATURES} " == *" force-prefix "* ]] || \
-	case "$EAPI" in 0|1|2) ED=${D} ;; esac
+if ! ___eapi_has_prefix_variables; then
+	ED=${D}
+fi
 
 LIBDIR_VAR="LIBDIR_${ABI}"
 if [ -n "${ABI}" -a -n "${!LIBDIR_VAR}" ]; then
diff --git a/bin/ebuild-helpers/prepman b/bin/ebuild-helpers/prepman
index f96b64147..142d40443 100755
--- a/bin/ebuild-helpers/prepman
+++ b/bin/ebuild-helpers/prepman
@@ -1,11 +1,12 @@
 #!/bin/bash
-# Copyright 1999-2011 Gentoo Foundation
+# Copyright 1999-2012 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 
 source "${PORTAGE_BIN_PATH:-/usr/lib/portage/bin}"/isolated-functions.sh
 
-[[ " ${FEATURES} " == *" force-prefix "* ]] || \
-	case "$EAPI" in 0|1|2) ED=${D} ;; esac
+if ! ___eapi_has_prefix_variables; then
+	ED=${D}
+fi
 
 if [[ -z $1 ]] ; then 
 	mandir="${ED}usr/share/man"
@@ -19,7 +20,7 @@ if [[ ! -d ${mandir} ]] ; then
 fi
 
 # replaced by controllable compression in EAPI 4
-has "${EAPI}" 0 1 2 3 || exit 0
+___eapi_has_docompress && exit 0
 
 shopt -s nullglob
 
diff --git a/bin/ebuild-helpers/prepstrip b/bin/ebuild-helpers/prepstrip
index 802fdd826..0d1ce5a09 100755
--- a/bin/ebuild-helpers/prepstrip
+++ b/bin/ebuild-helpers/prepstrip
@@ -18,8 +18,9 @@ exp_tf() {
 exp_tf FEATURES compressdebug installsources nostrip splitdebug
 exp_tf RESTRICT binchecks installsources strip
 
-[[ " ${FEATURES} " == *" force-prefix "* ]] || \
-	case "${EAPI}" in 0|1|2) EPREFIX= ED=${D} ;; esac
+if ! ___eapi_has_prefix_variables; then
+	EPREFIX= ED=${D}
+fi
 
 banner=false
 SKIP_STRIP=false
diff --git a/bin/ebuild.sh b/bin/ebuild.sh
index 06e2c66f6..aa3dcdd28 100755
--- a/bin/ebuild.sh
+++ b/bin/ebuild.sh
@@ -26,16 +26,16 @@ else
 		__strip_duplicate_slashes \
 		use_with use_enable ; do
 		eval "${x}() {
-			if has \"\${EAPI:-0}\" 4-python 5-progress; then
+			if ___eapi_disallows_helpers_in_global_scope; then
 				die \"\${FUNCNAME}() calls are not allowed in global scope\"
 			fi
 		}"
 	done
-	# These dummy functions return false in older EAPIs, in order to ensure that
+	# These dummy functions return false in non-strict EAPIs, in order to ensure that
 	# `use multislot` is false for the "depend" phase.
 	for x in use useq usev usex ; do
 		eval "${x}() {
-			if has \"\${EAPI:-0}\" 4-python 5-progress; then
+			if ___eapi_disallows_helpers_in_global_scope; then
 				die \"\${FUNCNAME}() calls are not allowed in global scope\"
 			else
 				return 1
@@ -512,7 +512,7 @@ if ! has "$EBUILD_PHASE" clean cleanrm depend && \
 	[[ -n $EAPI ]] || EAPI=0
 fi
 
-if has "${EAPI:-0}" 4-python 5-progress; then
+if ___eapi_enables_globstar; then
 	shopt -s globstar
 fi
 
@@ -557,7 +557,7 @@ if ! has "$EBUILD_PHASE" clean cleanrm ; then
 		# export EAPI for helpers (especially since we unset it above)
 		export EAPI
 
-		if has "$EAPI" 0 1 2 3 ; then
+		if ___eapi_has_RDEPEND_DEPEND_fallback; then
 			export RDEPEND=${RDEPEND-${DEPEND}}
 			debug-print "RDEPEND: not set... Setting to: ${DEPEND}"
 		fi
@@ -675,13 +675,9 @@ if [[ $EBUILD_PHASE = depend ]] ; then
 		PROPERTIES DEFINED_PHASES HDEPEND UNUSED_04
 		UNUSED_03 UNUSED_02 UNUSED_01"
 
-	case ${EAPI} in
-		5-hdepend)
-			;;
-		*)
-			unset HDEPEND
-			;;
-	esac
+	if ! ___eapi_has_HDEPEND; then
+		unset HDEPEND
+	fi
 
 	# The extra $(echo) commands remove newlines.
 	if [ -n "${dbkey}" ] ; then
@@ -700,15 +696,9 @@ else
 	# Note: readonly variables interfere with __preprocess_ebuild_env(), so
 	# declare them only after it has already run.
 	declare -r $PORTAGE_READONLY_METADATA $PORTAGE_READONLY_VARS
-	case ${EAPI} in
-		0|1|2)
-			[[ " ${FEATURES} " == *" force-prefix "* ]] && \
-				declare -r ED EPREFIX EROOT
-			;;
-		*)
-			declare -r ED EPREFIX EROOT
-			;;
-	esac
+	if ___eapi_has_prefix_variables; then
+		declare -r ED EPREFIX EROOT
+	fi
 
 	if [[ -n $EBUILD_SH_ARGS ]] ; then
 		(
diff --git a/bin/isolated-functions.sh b/bin/isolated-functions.sh
index fa84c7ee3..f8e7862ee 100644
--- a/bin/isolated-functions.sh
+++ b/bin/isolated-functions.sh
@@ -2,6 +2,8 @@
 # Copyright 1999-2012 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 
+source "${PORTAGE_BIN_PATH:-/usr/lib/portage/bin}/eapi.sh"
+
 # We need this next line for "die" and "assert". It expands
 # It _must_ preceed all the calls to die and assert.
 shopt -s expand_aliases
@@ -86,7 +88,7 @@ __dump_trace() {
 }
 
 nonfatal() {
-	if has "${EAPI:-0}" 0 1 2 3 ; then
+	if ! ___eapi_has_nonfatal; then
 		die "$FUNCNAME() not supported in this EAPI"
 	fi
 	if [[ $# -lt 1 ]]; then
@@ -97,14 +99,11 @@ nonfatal() {
 }
 
 __helpers_die() {
-	case "${EAPI:-0}" in
-		0|1|2|3)
-			echo -e "$@" >&2
-			;;
-		*)
-			die "$@"
-			;;
-	esac
+	if ___eapi_helpers_can_die; then
+		die "$@"
+	else
+		echo -e "$@" >&2
+	fi
 }
 
 die() {
diff --git a/bin/misc-functions.sh b/bin/misc-functions.sh
index 55d37f29d..986264ed8 100755
--- a/bin/misc-functions.sh
+++ b/bin/misc-functions.sh
@@ -17,8 +17,9 @@ shift $#
 source "${PORTAGE_BIN_PATH:-/usr/lib/portage/bin}/ebuild.sh"
 
 install_symlink_html_docs() {
-	[[ " ${FEATURES} " == *" force-prefix "* ]] || \
-		case "$EAPI" in 0|1|2) local ED=${D} ;; esac
+	if ! ___eapi_has_prefix_variables; then
+		local ED=${D}
+	fi
 	cd "${ED}" || die "cd failed"
 	#symlink the html documentation (if DOC_SYMLINKS_DIR is set in make.conf)
 	if [ -n "${DOC_SYMLINKS_DIR}" ] ; then
@@ -79,8 +80,9 @@ canonicalize() {
 prepcompress() {
 	local -a include exclude incl_d incl_f
 	local f g i real_f real_d
-	[[ " ${FEATURES} " == *" force-prefix "* ]] || \
-		case "$EAPI" in 0|1|2) local ED=${D} ;; esac
+	if ! ___eapi_has_prefix_variables; then
+		local ED=${D}
+	fi
 
 	# Canonicalize path names and check for their existence.
 	real_d=$(canonicalize "${ED}")
@@ -162,8 +164,9 @@ prepcompress() {
 
 install_qa_check() {
 	local f i qa_var x
-	[[ " ${FEATURES} " == *" force-prefix "* ]] || \
-		case "$EAPI" in 0|1|2) local EPREFIX= ED=${D} ;; esac
+	if ! ___eapi_has_prefix_variables; then
+		local EPREFIX= ED=${D}
+	fi
 
 	cd "${ED}" || die "cd failed"
 
@@ -228,7 +231,7 @@ install_qa_check() {
 
 	export STRIP_MASK
 	prepall
-	has "${EAPI}" 0 1 2 3 || prepcompress
+	___eapi_has_docompress && prepcompress
 	ecompressdir --dequeue
 	ecompress --dequeue
 
@@ -958,8 +961,9 @@ preinst_mask() {
 		 return 1
 	fi
 
-	[[ " ${FEATURES} " == *" force-prefix "* ]] || \
-		case "$EAPI" in 0|1|2) local ED=${D} ;; esac
+	if ! ___eapi_has_prefix_variables; then
+		local ED=${D}
+	fi
 
 	# Make sure $PWD is not ${D} so that we don't leave gmon.out files
 	# in there in case any tools were built with -pg in CFLAGS.
@@ -987,8 +991,9 @@ preinst_sfperms() {
 		 return 1
 	fi
 
-	[[ " ${FEATURES} " == *" force-prefix "* ]] || \
-		case "$EAPI" in 0|1|2) local ED=${D} ;; esac
+	if ! ___eapi_has_prefix_variables; then
+		local ED=${D}
+	fi
 
 	# Smart FileSystem Permissions
 	if has sfperms $FEATURES; then
@@ -1026,8 +1031,9 @@ preinst_suid_scan() {
 		 return 1
 	fi
 
-	[[ " ${FEATURES} " == *" force-prefix "* ]] || \
-		case "$EAPI" in 0|1|2) local ED=${D} ;; esac
+	if ! ___eapi_has_prefix_variables; then
+		local ED=${D}
+	fi
 
 	# total suid control.
 	if has suidctl $FEATURES; then
@@ -1095,8 +1101,9 @@ preinst_selinux_labels() {
 __dyn_package() {
 	local PROOT
 
-	[[ " ${FEATURES} " == *" force-prefix "* ]] || \
-		case "$EAPI" in 0|1|2) local EPREFIX= ED=${D} ;; esac
+	if ! ___eapi_has_prefix_variables; then
+		local EPREFIX= ED=${D}
+	fi
 
 	# Make sure $PWD is not ${D} so that we don't leave gmon.out files
 	# in there in case any tools were built with -pg in CFLAGS.
@@ -1193,9 +1200,9 @@ __END1__
 }
 
 __dyn_rpm() {
-
-	[[ " ${FEATURES} " == *" force-prefix "* ]] || \
-		case "$EAPI" in 0|1|2) local EPREFIX= ;; esac
+	if ! ___eapi_has_prefix_variables; then
+		local EPREFIX=
+	fi
 
 	cd "${T}" || die "cd failed"
 	local machine_name=$(uname -m)
diff --git a/bin/phase-functions.sh b/bin/phase-functions.sh
index 97e762a39..7a0baf453 100644
--- a/bin/phase-functions.sh
+++ b/bin/phase-functions.sh
@@ -100,15 +100,9 @@ __filter_readonly_variables() {
 
 	# Don't filter/interfere with prefix variables unless they are
 	# supported by the current EAPI.
-	case "${EAPI:-0}" in
-		0|1|2)
-			[[ " ${FEATURES} " == *" force-prefix "* ]] && \
-				filtered_vars+=" ED EPREFIX EROOT"
-			;;
-		*)
-			filtered_vars+=" ED EPREFIX EROOT"
-			;;
-	esac
+	if ___eapi_has_prefix_variables; then
+		filtered_vars+=" ED EPREFIX EROOT"
+	fi
 
 	if has --filter-sandbox $* ; then
 		filtered_vars="${filtered_vars} SANDBOX_.*"
@@ -364,7 +358,7 @@ __dyn_prepare() {
 
 	if [[ -d $S ]] ; then
 		cd "${S}"
-	elif has $EAPI 0 1 2 3 ; then
+	elif ___eapi_has_S_WORKDIR_fallback; then
 		cd "${WORKDIR}"
 	elif [[ -z ${A} ]] && ! __has_phase_defined_up_to prepare; then
 		cd "${WORKDIR}"
@@ -395,7 +389,7 @@ __dyn_configure() {
 
 	if [[ -d $S ]] ; then
 		cd "${S}"
-	elif has $EAPI 0 1 2 3 ; then
+	elif ___eapi_has_S_WORKDIR_fallback; then
 		cd "${WORKDIR}"
 	elif [[ -z ${A} ]] && ! __has_phase_defined_up_to configure; then
 		cd "${WORKDIR}"
@@ -428,7 +422,7 @@ __dyn_compile() {
 
 	if [[ -d $S ]] ; then
 		cd "${S}"
-	elif has $EAPI 0 1 2 3 ; then
+	elif ___eapi_has_S_WORKDIR_fallback; then
 		cd "${WORKDIR}"
 	elif [[ -z ${A} ]] && ! __has_phase_defined_up_to compile; then
 		cd "${WORKDIR}"
@@ -510,16 +504,18 @@ __dyn_install() {
 	trap "__abort_install" SIGINT SIGQUIT
 	__ebuild_phase pre_src_install
 
-	_x=${ED}
-	[[ " ${FEATURES} " == *" force-prefix "* ]] || \
-		case "$EAPI" in 0|1|2) _x=${D} ;; esac
+	if ___eapi_has_prefix_variables; then
+		_x=${ED}
+	else
+		_x=${D}
+	fi
 	rm -rf "${D}"
 	mkdir -p "${_x}"
 	unset _x
 
 	if [[ -d $S ]] ; then
 		cd "${S}"
-	elif has $EAPI 0 1 2 3 ; then
+	elif ___eapi_has_S_WORKDIR_fallback; then
 		cd "${WORKDIR}"
 	elif [[ -z ${A} ]] && ! __has_phase_defined_up_to install; then
 		cd "${WORKDIR}"
@@ -571,15 +567,9 @@ __dyn_install() {
 	# Save EPREFIX, since it makes it easy to use chpathtool to
 	# adjust the content of a binary package so that it will
 	# work in a different EPREFIX from the one is was built for.
-	case "${EAPI:-0}" in
-		0|1|2)
-			[[ " ${FEATURES} " == *" force-prefix "* ]] && \
-				[ -n "${EPREFIX}" ] && echo "${EPREFIX}" > EPREFIX
-			;;
-		*)
-			[ -n "${EPREFIX}" ] && echo "${EPREFIX}" > EPREFIX
-			;;
-	esac
+	if ___eapi_has_prefix_variables && [[ -n ${EPREFIX} ]]; then
+		echo "${EPREFIX}" > EPREFIX
+	fi
 
 	set +f
 
@@ -669,14 +659,13 @@ __dyn_help() {
 # Translate a known ebuild(1) argument into the precise
 # name of it's corresponding ebuild phase.
 __ebuild_arg_to_phase() {
-	[ $# -ne 2 ] && die "expected exactly 2 args, got $#: $*"
-	local eapi=$1
-	local arg=$2
+	[ $# -ne 1 ] && die "expected exactly 1 arg, got $#: $*"
+	local arg=$1
 	local phase_func=""
 
 	case "$arg" in
 		pretend)
-			! has $eapi 0 1 2 3 && \
+			___eapi_has_pkg_pretend && \
 				phase_func=pkg_pretend
 			;;
 		setup)
@@ -689,11 +678,11 @@ __ebuild_arg_to_phase() {
 			phase_func=src_unpack
 			;;
 		prepare)
-			! has $eapi 0 1 && \
+			___eapi_has_src_prepare && \
 				phase_func=src_prepare
 			;;
 		configure)
-			! has $eapi 0 1 && \
+			___eapi_has_src_configure && \
 				phase_func=src_configure
 			;;
 		compile)
@@ -853,7 +842,7 @@ __ebuild_main() {
 	# respect FEATURES="-ccache".
 	has ccache $FEATURES || export CCACHE_DISABLE=1
 
-	local phase_func=$(__ebuild_arg_to_phase "$EAPI" "$EBUILD_PHASE")
+	local phase_func=$(__ebuild_arg_to_phase "$EBUILD_PHASE")
 	[[ -n $phase_func ]] && __ebuild_phase_funcs "$EAPI" "$phase_func"
 	unset phase_func
 
diff --git a/bin/phase-helpers.sh b/bin/phase-helpers.sh
index 157725ff3..dc70de658 100644
--- a/bin/phase-helpers.sh
+++ b/bin/phase-helpers.sh
@@ -19,8 +19,9 @@ into() {
 		export DESTTREE=""
 	else
 		export DESTTREE=$1
-		[[ " ${FEATURES} " == *" force-prefix "* ]] || \
-			case "$EAPI" in 0|1|2) local ED=${D} ;; esac
+		if ! ___eapi_has_prefix_variables; then
+			local ED=${D}
+		fi
 		if [ ! -d "${ED}${DESTTREE}" ]; then
 			install -d "${ED}${DESTTREE}"
 			local ret=$?
@@ -37,8 +38,9 @@ insinto() {
 		export INSDESTTREE=""
 	else
 		export INSDESTTREE=$1
-		[[ " ${FEATURES} " == *" force-prefix "* ]] || \
-			case "$EAPI" in 0|1|2) local ED=${D} ;; esac
+		if ! ___eapi_has_prefix_variables; then
+			local ED=${D}
+		fi
 		if [ ! -d "${ED}${INSDESTTREE}" ]; then
 			install -d "${ED}${INSDESTTREE}"
 			local ret=$?
@@ -55,8 +57,9 @@ exeinto() {
 		export _E_EXEDESTTREE_=""
 	else
 		export _E_EXEDESTTREE_="$1"
-		[[ " ${FEATURES} " == *" force-prefix "* ]] || \
-			case "$EAPI" in 0|1|2) local ED=${D} ;; esac
+		if ! ___eapi_has_prefix_variables; then
+			local ED=${D}
+		fi
 		if [ ! -d "${ED}${_E_EXEDESTTREE_}" ]; then
 			install -d "${ED}${_E_EXEDESTTREE_}"
 			local ret=$?
@@ -73,8 +76,9 @@ docinto() {
 		export _E_DOCDESTTREE_=""
 	else
 		export _E_DOCDESTTREE_="$1"
-		[[ " ${FEATURES} " == *" force-prefix "* ]] || \
-			case "$EAPI" in 0|1|2) local ED=${D} ;; esac
+		if ! ___eapi_has_prefix_variables; then
+			local ED=${D}
+		fi
 		if [ ! -d "${ED}usr/share/doc/${PF}/${_E_DOCDESTTREE_}" ]; then
 			install -d "${ED}usr/share/doc/${PF}/${_E_DOCDESTTREE_}"
 			local ret=$?
@@ -112,7 +116,7 @@ libopts() {
 }
 
 docompress() {
-	has "${EAPI}" 0 1 2 3 && die "'docompress' not supported in this EAPI"
+	___eapi_has_docompress || die "'docompress' not supported in this EAPI"
 
 	local f g
 	if [[ $1 = "-x" ]]; then
@@ -141,8 +145,9 @@ docompress() {
 keepdir() {
 	dodir "$@"
 	local x
-	[[ " ${FEATURES} " == *" force-prefix "* ]] || \
-		case "$EAPI" in 0|1|2) local ED=${D} ;; esac
+	if ! ___eapi_has_prefix_variables; then
+		local ED=${D}
+	fi
 	if [ "$1" == "-R" ] || [ "$1" == "-r" ]; then
 		shift
 		find "$@" -type d -printf "${ED}%p/.keep_${CATEGORY}_${PN}-${SLOT}\n" \
@@ -174,19 +179,16 @@ usev() {
 	return 1
 }
 
-case "${EAPI}" in
-	0|1|2|3|4|4-python|4-slot-abi) ;;
-	*)
-		usex() {
-			if use "$1"; then
-				echo "${2-yes}$4"
-			else
-				echo "${3-no}$5"
-			fi
-			return 0
-		}
-		;;
-esac
+if ___eapi_has_usex; then
+	usex() {
+		if use "$1"; then
+			echo "${2-yes}$4"
+		else
+			echo "${3-no}$5"
+		fi
+		return 0
+	}
+fi
 
 use() {
 	local u=$1
@@ -233,7 +235,7 @@ use_with() {
 		return 1
 	fi
 
-	if ! has "${EAPI:-0}" 0 1 2 3 ; then
+	if ___eapi_use_enable_and_use_with_support_empty_third_argument; then
 		local UW_SUFFIX=${3+=$3}
 	else
 		local UW_SUFFIX=${3:+=$3}
@@ -255,7 +257,7 @@ use_enable() {
 		return 1
 	fi
 
-	if ! has "${EAPI:-0}" 0 1 2 3 ; then
+	if ___eapi_use_enable_and_use_with_support_empty_third_argument; then
 		local UE_SUFFIX=${3+=$3}
 	else
 		local UE_SUFFIX=${3:+=$3}
@@ -377,10 +379,10 @@ unpack() {
 				__unpack_tar "lzma -d"
 				;;
 			xz)
-				if has $eapi 0 1 2 ; then
-					__vecho "unpack ${x}: file format not recognized. Ignoring."
-				else
+				if ___eapi_unpack_supports_xz; then
 					__unpack_tar "xz -d"
+				else
+					__vecho "unpack ${x}: file format not recognized. Ignoring."
 				fi
 				;;
 			*)
@@ -397,8 +399,9 @@ unpack() {
 econf() {
 	local x
 
-	[[ " ${FEATURES} " == *" force-prefix "* ]] || \
-		case "$EAPI" in 0|1|2) local EPREFIX= ;; esac
+	if ! ___eapi_has_prefix_variables; then
+		local EPREFIX=
+	fi
 
 	__hasg() {
 		local x s=$1
@@ -409,9 +412,9 @@ econf() {
 
 	__hasgq() { __hasg "$@" >/dev/null ; }
 
-	local phase_func=$(__ebuild_arg_to_phase "$EAPI" "$EBUILD_PHASE")
+	local phase_func=$(__ebuild_arg_to_phase "$EBUILD_PHASE")
 	if [[ -n $phase_func ]] ; then
-		if has "$EAPI" 0 1 ; then
+		if ! ___eapi_has_src_configure; then
 			[[ $phase_func != src_compile ]] && \
 				eqawarn "QA Notice: econf called in" \
 					"$phase_func instead of src_compile"
@@ -438,30 +441,25 @@ econf() {
 			done
 		fi
 
-		# EAPI=4 adds --disable-dependency-tracking to econf
-		case "${EAPI}" in
-			0|1|2|3)
-				;;
-			*)
-				local conf_help=$("${ECONF_SOURCE}/configure" --help 2>/dev/null)
+		if ___eapi_econf_passes_--disable-dependency-tracking || ___eapi_econf_passes_--disable-silent-rules; then
+			local conf_help=$("${ECONF_SOURCE}/configure" --help 2>/dev/null)
+
+			if ___eapi_econf_passes_--disable-dependency-tracking; then
 				case "${conf_help}" in
 					*--disable-dependency-tracking*)
 						set -- --disable-dependency-tracking "$@"
 						;;
 				esac
-				case "${EAPI}" in
-					4|4-python|4-slot-abi)
-						;;
-					*)
-						case "${conf_help}" in
-							*--disable-silent-rules*)
-								set -- --disable-silent-rules "$@"
-								;;
-						esac
+			fi
+
+			if ___eapi_econf_passes_--disable-silent-rules; then
+				case "${conf_help}" in
+					*--disable-silent-rules*)
+						set -- --disable-silent-rules "$@"
 						;;
 				esac
-				;;
-		esac
+			fi
+		fi
 
 		# if the profile defines a location to install libs to aside from default, pass it on.
 		# if the ebuild passes in --libdir, they're responsible for the conf_libdir fun.
@@ -512,8 +510,9 @@ econf() {
 einstall() {
 	# CONF_PREFIX is only set if they didn't pass in libdir above.
 	local LOCAL_EXTRA_EINSTALL="${EXTRA_EINSTALL}"
-	[[ " ${FEATURES} " == *" force-prefix "* ]] || \
-		case "$EAPI" in 0|1|2) local ED=${D} ;; esac
+	if ! ___eapi_has_prefix_variables; then
+		local ED=${D}
+	fi
 	LIBDIR_VAR="LIBDIR_${ABI}"
 	if [ -n "${ABI}" -a -n "${!LIBDIR_VAR}" ]; then
 		CONF_LIBDIR="${!LIBDIR_VAR}"
@@ -581,11 +580,9 @@ __eapi0_src_test() {
 	# to emulate the desired parts of emake behavior.
 	local emake_cmd="${MAKE:-make} ${MAKEOPTS} ${EXTRA_EMAKE}"
 	local internal_opts=
-	case "$EAPI" in
-		0|1|2|3|4|4-python|4-slot-abi)
-			internal_opts+=" -j1"
-			;;
-	esac
+	if ___eapi_default_src_test_disables_parallel_jobs; then
+		internal_opts+=" -j1"
+	fi
 	if $emake_cmd ${internal_opts} check -n &> /dev/null; then
 		__vecho ">>> Test phase [check]: ${CATEGORY}/${PF}"
 		$emake_cmd ${internal_opts} check || \
@@ -652,23 +649,17 @@ has_version() {
 	[ $# -gt 0 ] && die "${FUNCNAME[0]}: unused argument(s): $*"
 
 	if ${host_root} ; then
-		case "${EAPI}" in
-			0|1|2|3|4|4-python|4-slot-abi)
-				die "${FUNCNAME[0]}: option --host-root is not supported with EAPI ${EAPI}"
-				;;
-		esac
+		if ! ___eapi_best_version_and_has_version_support_--host-root; then
+			die "${FUNCNAME[0]}: option --host-root is not supported with EAPI ${EAPI}"
+		fi
 		root=/
 	fi
 
-	case "$EAPI" in
-		0|1|2)
-			[[ " ${FEATURES} " == *" force-prefix "* ]] && \
-				eroot=${root%/}${EPREFIX}/ || eroot=${root}
-			;;
-		*)
-			eroot=${root%/}${EPREFIX}/
-			;;
-	esac
+	if ___eapi_has_prefix_variables; then
+		eroot=${root%/}${EPREFIX}/
+	else
+		eroot=${root}
+	fi
 	if [[ -n $PORTAGE_IPC_DAEMON ]] ; then
 		"$PORTAGE_BIN_PATH"/ebuild-ipc has_version "${eroot}" "${atom}"
 	else
@@ -704,23 +695,17 @@ best_version() {
 	[ $# -gt 0 ] && die "${FUNCNAME[0]}: unused argument(s): $*"
 
 	if ${host_root} ; then
-		case "${EAPI}" in
-			0|1|2|3|4|4-python|4-slot-abi)
-				die "${FUNCNAME[0]}: option --host-root is not supported with EAPI ${EAPI}"
-				;;
-		esac
+		if ! ___eapi_best_version_and_has_version_support_--host-root; then
+			die "${FUNCNAME[0]}: option --host-root is not supported with EAPI ${EAPI}"
+		fi
 		root=/
 	fi
 
-	case "$EAPI" in
-		0|1|2)
-			[[ " ${FEATURES} " == *" force-prefix "* ]] && \
-				eroot=${root%/}${EPREFIX}/ || eroot=${root}
-			;;
-		*)
-			eroot=${root%/}${EPREFIX}/
-			;;
-	esac
+	if ___eapi_has_prefix_variables; then
+		eroot=${root%/}${EPREFIX}/
+	else
+		eroot=${root}
+	fi
 	if [[ -n $PORTAGE_IPC_DAEMON ]] ; then
 		"$PORTAGE_BIN_PATH"/ebuild-ipc best_version "${eroot}" "${atom}"
 	else
diff --git a/bin/save-ebuild-env.sh b/bin/save-ebuild-env.sh
index 7ae3938ce..92cc692db 100644
--- a/bin/save-ebuild-env.sh
+++ b/bin/save-ebuild-env.sh
@@ -76,10 +76,11 @@ __save_ebuild_env() {
 		__unpack_tar __unset_colors \
 		${QA_INTERCEPTORS}
 
-	case "${EAPI}" in
-		0|1|2|3|4|4-python|4-slot-abi) ;;
-		*) unset -f usex ;;
-	esac
+	if ___eapi_has_usex; then
+		unset -f usex
+	fi
+
+	unset -f $(compgen -A function ___eapi_)
 
 	# portage config variables and variables set directly by portage
 	unset ACCEPT_LICENSE BAD BRACKET BUILD_PREFIX COLS \
-- 
2.26.2