Use Portage config directly from src dir

Instead of copying the Portage configuration files to `/etc/portage` and
`/usr/${target}/etc/portage`, the build scripts now use the
configuration directories from the source directory.  This avoids issues
with changes (especially removal of files) getting propagated to the
actual configuration paths.

.gitignore

@@ -1,6 +1,10 @@
 /images
 /linux
 /output
+/portage/config/*/etc/portage/make.profile
+/portage/config/*/etc/portage/repos.conf
+/portage/config/target/etc/portage/make.conf/10-crossdev.conf
+/portage/repos/x-portage
 /.built
 /.prepared
 /.host-tools

Makefile

@@ -5,12 +5,9 @@ update.tar: $(IMAGESDIR)/update.tar.zstd
 
 $(O)/.prepared: \
 		prepare.sh \
-		config-portage.sh \
 		setup-local-repo.sh \
-		$(shell find portage host-portage -type f) \
 		$(shell find patches/ebuilds -type f)
 	./prepare.sh
-	./config-portage.sh
 	./setup-local-repo.sh
 	mkdir -p $(O)
 	touch $(O)/.prepared

build-host-tools.sh

@@ -1,5 +1,6 @@
 #!/bin/sh
 # vim: set sw=4 ts=4 sts=4 et :
 
+PORTAGE_CONFIGROOT="${PWD}"/portage/config/host \
 < host-tools.packages xargs -ro \
 emerge -vnUj

build-kernel.sh

@@ -7,6 +7,7 @@ O="${1}"
 
 . ./config
 
+PORTAGE_CONFIGROOT="${PWD}"/portage/config/host \
 emerge -vnj ${kernel_pkg}
 
 export ARCH=arm64 CROSS_COMPILE=${target}-

build-rootfs.sh

@@ -23,12 +23,12 @@ ln -snf \
 cp -r portage/. /mnt/gentoo/etc/portage/
 
 ROOT=/mnt/gentoo \
-PORTAGE_CONFIGROOT=/mnt/gentoo \
+PORTAGE_CONFIGROOT="${PWD}"/portage/config/target \
 < install.packages xargs -ro \
 ${target}-emerge -Kvnj
 
 ROOT=/mnt/gentoo \
-PORTAGE_CONFIGROOT=/mnt/gentoo \
+PORTAGE_CONFIGROOT="${PWD}"/portage/config/target \
 < installonly.packages xargs -ro \
 ${target}-emerge -vnj
 

build.sh

@@ -7,6 +7,8 @@ set -e
 
 unset MAKEFLAGS MAKEOVERRIDES MAKELEVEL
 
+export PORTAGE_CONFIGROOT="${PWD}"/portage/config/target
+
 ${target}-emerge -vuUDj sys-apps/util-linux
 
 cat \

config-portage.sh

@@ -1,14 +0,0 @@
-#!/bin/sh
-# vim: set sw=4 ts=4 sts=4 et :
-
-set -e
-
-. ./config
-
-cp -r host-portage/. /etc/portage/
-cp -r portage/. /usr/${target}/etc/portage/
-
-# Set the Portage profile
-ln -snf \
-    /var/db/repos/gentoo/profiles/${profile} \
-    /usr/${target}/etc/portage/make.profile

portage/repos/x-portage/metadata/layout.conf

@@ -0,0 +1 @@
+masters = gentoo

portage/repos/x-portage/profiles/repo_name

@@ -0,0 +1 @@
+x-portage

prepare.sh

@@ -13,16 +13,16 @@ fi
 chown portage: "$(portageq envvar DISTDIR)"
 
 ARCH=$(PORTAGE_CONFIGROOT=/usr/${target} portageq envvar ARCH)
+PKGDIR=$(portageq envvar PKGDIR)
+FEATURES="${FEATURES} binpkg-multi-instance"
 
-if [ -f /usr/${target}/etc/portage/make.conf ]; then
-    sed -i '/PKGDIR=/d' /usr/${target}/etc/portage/make.conf
-fi
 # For some reason, libcap installs its pkg-config files in the wrong
 # place.  More strangely, even though `PKG_CONFIG_PATH` contains that
 # directory, `pkg-config` does not find the `.pc` files for libcap.
 # We work around this by merging /usr/lib64/pkgconfig and
 # /usr/lib/pkgconfig.
-FEATURES="${FEATURES} binpkg-multi-instance" \
+FEATURES="${FEATURES}" \
+PKGDIR="${PKGDIR}" \
 ${target}-emerge -kb1vnj sys-libs/libcap
 if [ -d /usr/${target}/usr/lib/pkgconfig ] \
         && [ ! -d /usr/${target}/usr/lib64/pkgconfig ]; then
@@ -30,32 +30,35 @@ if [ -d /usr/${target}/usr/lib/pkgconfig ] \
     ln -snf ../lib64/pkgconfig /usr/${target}/usr/lib/pkgconfig
 fi
 
-if [ ! -d /usr/${target}/etc/portage/make.conf ]; then
-    mv /usr/${target}/etc/portage/make.conf \
-        /usr/${target}/etc/portage/make.conf.orig
-    sed -ri 's: ?-pam::' /usr/${target}/etc/portage/make.conf.orig
-    ls -l /usr/${target}/etc/portage
-    mkdir /usr/${target}/etc/portage/make.conf
-    mv /usr/${target}/etc/portage/make.conf.orig \
-        /usr/${target}/etc/portage/make.conf/10-base.conf
-fi
-
-if [ ! -d /etc/portage/make.conf ]; then
-    mv /etc/portage/make.conf \
-        /etc/portage/make.conf.orig
-    mkdir /etc/portage/make.conf
-    mv /etc/portage/make.conf.orig \
-        /etc/portage/make.conf/10-base.conf
+if [ ! -f portage/make.conf/10-crossdev.conf ]; then
+    sed -r \
+        -e 's: ?-pam::' \
+        -e '/PKGDIR=/d' \
+        /usr/${target}/etc/portage/make.conf \
+        > portage/config/target/etc/portage/make.conf/10-crossdev.conf
 fi
 
 ln -snf /var/db/repos/gentoo/profiles/default/linux/${ARCH}/17.0 \
     /usr/${target}/etc/portage/make.profile
 
+FEATURES="${FEATURES}" \
+PKGDIR="${PKGDIR}" \
 ${target}-emerge -bk1nvj sys-libs/glibc
 
+FEATURES="${FEATURES}" \
+PKGDIR=$(portageq envvar PKGDIR) \
+USE=pam \
 ${target}-emerge -bknvj sys-apps/util-linux
 
 # Migrate to the merged-usr layout
 mkdir -p /usr/${target}/bin
 emerge -bknv --quiet-build=y merge-usr
 merge-usr --root=/usr/${target}
+
+# Set the Portage profile
+ln -snf \
+    /var/db/repos/gentoo/profiles/${profile} \
+    portage/config/target/etc/portage/make.profile
+ln -snf \
+    $(realpath /etc/portage/make.profile) \
+    portage/config/host/etc/portage/make.profile

setup-local-repo.sh

@@ -5,13 +5,10 @@ set -e
 
 . ./config
 
-mkdir -p /var/db/repos/x-portage/profiles /var/db/repos/x-portage/metadata
-echo x-portage > /var/db/repos/x-portage/profiles/repo_name
-echo 'masters = gentoo' > /var/db/repos/x-portage/metadata/layout.conf
-mkdir -p /usr/${target}/etc/portage/repos.conf
-cat > /usr/${target}/etc/portage/repos.conf/x-portage.conf <<EOF
+mkdir -p portage/config/target/etc/portage/repos.conf
+cat > portage/config/target/etc/portage/repos.conf/x-portage.conf <<EOF
 [x-portage]
-location = /var/db/repos/x-portage
+location = ${PWD}/portage/repos/x-portage
 auto-sync = no
 EOF
 
@@ -20,9 +17,9 @@ for patch in patches/ebuilds/*/*/*.patch; do
     cp=${patch#patches/ebuilds/}
     cp=${cp%/*.patch}
     printf 'Applying patch %s for %s ...\n' "${patch##*/}" "${cp}"
-    mkdir -p /var/db/repos/x-portage/${cp}
-    cp -r /var/db/repos/gentoo/${cp}/. /var/db/repos/x-portage/${cp}
-    for f in /var/db/repos/x-portage/${cp}/*.ebuild; do
+    mkdir -p portage/repos/x-portage/${cp}
+    cp -r /var/db/repos/gentoo/${cp}/. portage/repos/x-portage/${cp}
+    for f in portage/repos/x-portage/${cp}/*.ebuild; do
         patch "${f}" "${patch}"
         ebuild "${f}" digest
     done