systemd/systemd-stage0: provide pc:libsystemd

See the comment in the APKBUILD for the details.

Closes #4156

Tweak by Oliver: set provider_priority=1 explicitly, so the CI script
passes. systemd proper has provider_priority=100 for the dev()
subpackage.

Signed-off-by: Oliver Smith <ollieparanoid@postmarketos.org>
Part-of: <https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/8711>

extra-repos/systemd/systemd-stage0/APKBUILD

@@ -6,7 +6,7 @@ pkgname=systemd-stage0
 pkgver=261_rc2
 _pkgver="${pkgver/_/-}"
 # pkgrel must match systemd!
-pkgrel=1
+pkgrel=2
 pkgdesc="Minimal systemd bootstrap package"
 url="https://github.com/systemd/systemd"
 # armhf: pmb#2618
@@ -103,6 +103,25 @@ build() {
 	meson compile ${JOBS:+-j ${JOBS}} -C build
 }
 
+dev() {
+	default_dev
+
+	# Since we set !tracedeps, we must explicitly list things we want this
+	# package to provide. We mainly need systemd-stage0 to build dbus, which
+	# we then use to build the "real" systemd. We do not want to re-compile
+	# dbus afterwards, dbus-dev should pull in libsystemd.
+	# If we don't explicitly provide pc:libsystemd here, building dbus
+	# against systemd-stage0 would result in the following abuild log:
+	# "Could not find any provider for pc:libsystemd>=209"
+	# and dbus-dev would not depend on libsystemd.
+	# If systemd-stage0-dev provides pc:libsystemd, this is solved and
+	# dbus-dev correctly depends on pc:libsystemd. And yes, this is only
+	# necessary because of !tracedeps.
+	# See pma#4156 for the bootstrap issue this solves.
+	provides="$provides pc:libsystemd=${pkgver%%[._]*}"
+	provider_priority=1
+}
+
 package() {
 	DESTDIR="$pkgdir" meson install --no-rebuild -C build
 }

extra-repos/systemd/systemd/APKBUILD

@@ -10,7 +10,7 @@ pkgname=systemd
 pkgver=261_rc2
 _pkgver="${pkgver/_/-}"
 # pkgrel must match systemd-stage0!
-pkgrel=1
+pkgrel=2
 pkgdesc="System and service manager"
 url="https://github.com/systemd/systemd"
 # armhf: no linux-stable