[PATCH V3] kbuild: control extra pacman packages with PACMAN_EXTRAPACKAGES

[Jose Fernandez <jose.fernandez@linux.dev>]

Introduce the PACMAN_EXTRAPACKAGES variable in PKGBUILD to allow users
to specify which additional packages are built by the pacman-pkg target.

Previously, the api-headers package was always included, and the headers
package was included only if CONFIG_MODULES=y. With this change, both
headers and api-headers packages are included by default. Users can now
control this behavior by setting PACMAN_EXTRAPACKAGES to a
space-separated list of desired extra packages or leaving it empty to
exclude all.

For example, to build only the base package without extras:

make pacman-pkg PACMAN_EXTRAPACKAGES=""

Signed-off-by: Jose Fernandez <jose.fernandez@linux.dev>
Reviewed-by: Peter Jung <ptr1337@cachyos.org>
---
v1->v2:
- Build all extra packages by default
- Remove unnecessary lines
v2->v3:
- Move the default PACMAN_EXTRAPACKAGES value to PKGBUILD
- Remove all changes done to Makefile.package
- Conditionally run the install-extmod-build script if CONFIG_MODULES=y
- Add explicit `mkdir -p "${builddir}"` prior to copying System.map and .config

This patch gives users control over which extra packages are built, addressing
concerns about build time from adding a new debug package [1]. It allows
selective inclusion of extra packages before introducing an optional debug
package.

[1] https://lore.kernel.org/lkml/20240801192008.GA3923315@thelio-3990X/T/

 scripts/package/PKGBUILD | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/scripts/package/PKGBUILD b/scripts/package/PKGBUILD
index 663ce300dd06..fbd7eb10a52c 100644
--- a/scripts/package/PKGBUILD
+++ b/scripts/package/PKGBUILD
@@ -3,10 +3,13 @@
 # Contributor: Jan Alexander Steffens (heftig) <heftig@archlinux.org>
 
 pkgbase=${PACMAN_PKGBASE:-linux-upstream}
-pkgname=("${pkgbase}" "${pkgbase}-api-headers")
-if grep -q CONFIG_MODULES=y include/config/auto.conf; then
-	pkgname+=("${pkgbase}-headers")
-fi
+pkgname=("${pkgbase}")
+
+_extrapackages=${PACMAN_EXTRAPACKAGES-headers api-headers}
+for pkg in $_extrapackages; do
+	pkgname+=("${pkgbase}-${pkg}")
+done
+
 pkgver="${KERNELRELEASE//-/_}"
 # The PKGBUILD is evaluated multiple times.
 # Running scripts/build-version from here would introduce inconsistencies.
@@ -77,10 +80,13 @@ _package-headers() {
 	cd "${objtree}"
 	local builddir="${pkgdir}/usr/${MODLIB}/build"
 
-	echo "Installing build files..."
-	"${srctree}/scripts/package/install-extmod-build" "${builddir}"
+	if grep -q CONFIG_MODULES=y include/config/auto.conf; then
+		echo "Installing build files..."
+		"${srctree}/scripts/package/install-extmod-build" "${builddir}"
+	fi
 
 	echo "Installing System.map and config..."
+	mkdir -p "${builddir}"
 	cp System.map "${builddir}/System.map"
 	cp .config "${builddir}/.config"
 

base-commit: 7809144639f6c92bcb11bd3284b7806a42cc67fe
-- 
2.46.0