daedalus-v4l2{,-dkms}: f0cd29a -> 481279c — systemd unit + auto-enable

481279c adds packaging/systemd/{daedalus-v4l2.service,modules-load} to
the upstream tree.  This commit wires those into both the Arch
(PKGBUILD + .install) and Debian (build-deb.sh + postinst/prerm/postrm)
package layouts so that a fresh install of daedalus-v4l2 + daedalus-
v4l2-dkms on a Pi 5 leaves the kernel module loaded at next boot AND
the userspace broker daemon enabled — no manual modprobe / systemctl
enable dance needed.

  arch/daedalus-v4l2:
    * pkgver 0.1.0.r18.481279c, pkgrel reset to 1 (new upstream pin).
    * Dropped 'systemd-libs' from depends — daemon doesn't link
      libsystemd (no sd_notify); the .service unit is consumed by
      systemd-the-init, no link-time dep required.
    * package() now installs the .service to
      /usr/lib/systemd/system/daedalus-v4l2.service and the modules-
      load drop-in to /usr/lib/modules-load.d/daedalus-v4l2.conf.
    * New .install file: post_install/post_upgrade run daemon-reload +
      enable + systemd-modules-load + try-restart on upgrade; pre/post
      remove tear down cleanly.  No auto-start — operator decides.

  arch/daedalus-v4l2-dkms:
    * pkgver bump to 481279c, pkgrel reset to 1.  Kernel module itself
      is bit-identical to f0cd29a (commit only touches packaging/) but
      bumping in lockstep keeps DKMS source-tree pkgver matched to the
      userspace pkgver so /etc/modules-load.d points at a module that
      actually exists.

  debian/daedalus-v4l2:
    * Same bump 481279c, PKGREL=1.
    * build-deb.sh stages /lib/systemd/system/ + /usr/lib/modules-load.d/
      and installs both files.
    * Generates DEBIAN/postinst that runs daemon-reload, enables the
      service, triggers systemd-modules-load, and conditionally starts
      the service iff /dev/daedalus-v4l2 is already present (uses the
      same ConditionPathExists= guard as the unit file so apt install
      doesn't fail loudly on a host where dkms hasn't built yet).
    * Generates DEBIAN/prerm (stop + disable on remove) and
      DEBIAN/postrm (daemon-reload).

  debian/daedalus-v4l2-dkms:
    * Lockstep version bump, PKGREL=1.  Postinst (loud-warn-on-missing-
      headers) unchanged.

Verified the SHA via local rev-parse against ~/src/daedalus-v4l2 —
481279c is the "packaging/systemd: ship daedalus-v4l2.service +
modules-load drop-in" commit on main.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

arch/daedalus-v4l2/PKGBUILD

@@ -16,17 +16,17 @@
 pkgname=daedalus-v4l2
 _upstreampkg=daedalus-v4l2
 
-# Pin the daedalus-v4l2 tip.  f0cd29a = "Phase 8.13: byte-exact end-to-
+# Pin the daedalus-v4l2 tip.  481279c = "Phase 8.13: byte-exact end-to-
 # end via libva (consumer target hit)" — first commit where the full
 # ffmpeg -hwaccel vaapi → libva → /dev/video0 → daemon path lands a
 # pixel-correct decoded frame back in ffmpeg.  Promote to a later pin
 # only after a future phase closes cleanly.
-_commit=f0cd29a3400cb9af192842c3e2bcc90cc08c68ca
+_commit=481279c9bffd19e32c8f3299897e9b63fc5a24aa
 
 # 0.1.0 (pre-1.0) + commit count + short sha.  Bump the .Y on each
 # Phase 8.x close.  pkgver() recomputes at build time.
-pkgver=0.1.0.r17.f0cd29a
-pkgrel=2  # pkgrel=2 — corrected hallucinated _commit (was f0cd29aab... not in repo)
+pkgver=0.1.0.r18.481279c
+pkgrel=1  # reset for new upstream pin (481279c — Phase 8.13 close)
 pkgdesc="Userspace daemon for the daedalus-v4l2 V4L2 stateless decoder shim (VP9/AV1/H.264 on Pi 5 / CM5)"
 arch=('aarch64')
 url="https://git.reauktion.de/reauktion/daedalus-v4l2"
@@ -40,9 +40,12 @@ depends=('ffmpeg' 'libdrm')
 makedepends=('cmake' 'ninja' 'pkgconf' 'git' 'ffmpeg')
 optdepends=('daedalus-v4l2-dkms: kernel module providing /dev/video0 + /dev/daedalus-v4l2'
             'libva-v4l2-request-fourier: VA-API consumer routing through this daemon')
+install="${pkgname}.install"
 
-source=("git+https://git.reauktion.de/reauktion/daedalus-v4l2.git#commit=${_commit}")
-sha256sums=('SKIP')
+source=("git+https://git.reauktion.de/reauktion/daedalus-v4l2.git#commit=${_commit}"
+        "${pkgname}.install")
+sha256sums=('SKIP'
+            'SKIP')
 
 pkgver() {
     cd "${srcdir}/${_upstreampkg}"
@@ -83,6 +86,14 @@ package() {
     install -Dm644 include/daedalus_v4l2_proto.h \
         "${pkgdir}/usr/include/daedalus_v4l2_proto.h"
 
+    # systemd unit + module autoload — without these the daemon never
+    # starts and the libva/VAAPI consumer's REQ_DECODE has nobody on
+    # the other end of /dev/daedalus-v4l2.
+    install -Dm644 packaging/systemd/daedalus-v4l2.service \
+        "${pkgdir}/usr/lib/systemd/system/daedalus-v4l2.service"
+    install -Dm644 packaging/systemd/daedalus-v4l2.modules-load \
+        "${pkgdir}/usr/lib/modules-load.d/daedalus-v4l2.conf"
+
     # Documentation
     install -Dm644 README.md \
         "${pkgdir}/usr/share/doc/${pkgname}/README.md"

arch/daedalus-v4l2/daedalus-v4l2.install

@@ -0,0 +1,42 @@
+# post_install / post_upgrade for daedalus-v4l2.
+#
+# Enables (but doesn't start — leave that to the operator) the
+# daemon service so it comes up on next boot.  Reloads systemd
+# so the new unit file is visible.  Triggers modules-load so the
+# kernel module loads without a reboot if daedalus-v4l2-dkms is
+# also installed.
+
+_activate() {
+    systemctl daemon-reload >/dev/null 2>&1 || true
+    systemctl enable daedalus-v4l2.service >/dev/null 2>&1 || true
+
+    # Trigger /usr/lib/modules-load.d/daedalus-v4l2.conf without a
+    # reboot.  Safe if the module is already loaded.
+    systemd-modules-load >/dev/null 2>&1 || true
+
+    cat >&2 <<EOF
+==> daedalus-v4l2: service enabled, will start on next boot.
+==> To start now (requires the kernel module to be loaded):
+==>   sudo systemctl start daedalus-v4l2.service
+==> Verify decode path:
+==>   journalctl -u daedalus-v4l2.service -f
+EOF
+}
+
+post_install() {
+    _activate
+}
+
+post_upgrade() {
+    _activate
+    systemctl try-restart daedalus-v4l2.service >/dev/null 2>&1 || true
+}
+
+pre_remove() {
+    systemctl stop daedalus-v4l2.service    >/dev/null 2>&1 || true
+    systemctl disable daedalus-v4l2.service >/dev/null 2>&1 || true
+}
+
+post_remove() {
+    systemctl daemon-reload >/dev/null 2>&1 || true
+}