Fix archiso hook path: search rather than assume repo layout

The hooks are NOT at initcpio/hooks/archiso in the archiso git repo root
(that path doesn't exist). Remove the broken install lines from Dockerfile
and instead add a find diagnostic during build to reveal the actual paths.

entrypoint: use find to locate the hooks dynamically under /usr/share/archiso
(the releng airootfs copy) instead of hardcoding a path — bail with a clear
error listing if nothing is found.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

iso/docker/Dockerfile.arm64

@@ -61,12 +61,12 @@ RUN pacman -Syu --noconfirm && \
 # install them into the ISO airootfs (the chroot has no archiso package, so
 # the hooks must come from the airootfs overlay for mkinitcpio to use them).
 RUN git clone --depth=1 https://gitlab.archlinux.org/archlinux/archiso.git /tmp/archiso && \
-    install -Dm755 /tmp/archiso/archiso/mkarchiso        /usr/bin/mkarchiso && \
-    install -Dm755 /tmp/archiso/scripts/run_archiso.sh   /usr/bin/run_archiso && \
+    install -Dm755 /tmp/archiso/archiso/mkarchiso      /usr/bin/mkarchiso && \
+    install -Dm755 /tmp/archiso/scripts/run_archiso.sh /usr/bin/run_archiso && \
     install -d /usr/share/archiso && \
     cp -a /tmp/archiso/configs /usr/share/archiso/ && \
-    install -Dm644 /tmp/archiso/initcpio/hooks/archiso   /usr/share/archiso/initcpio/hooks/archiso && \
-    install -Dm644 /tmp/archiso/initcpio/install/archiso /usr/share/archiso/initcpio/install/archiso && \
+    echo "=== archiso hook locations ===" && \
+    find /tmp/archiso -name "archiso" -not -path "*/\.git/*" | sort && \
     rm -rf /tmp/archiso
 
 # Pre-download linux-aarch64 and create a local pacman repo so mkarchiso

iso/docker/entrypoint-arm64.sh

@@ -146,15 +146,31 @@ rm -f "$PROFILE/packages.x86_64"
 # ── 3. airootfs overlay — files that land in the live system ─────────
 AIROOTFS="$PROFILE/airootfs"
 
-# The archiso mkinitcpio hooks live in initcpio/ of the archiso git repo,
-# NOT in configs/releng/airootfs/ — so they aren't picked up by the releng
-# profile copy above. The ISO airootfs chroot has no archiso package either
-# (ALARM doesn't package it), so the hooks must be placed here explicitly.
-# The Dockerfile preserved the official hooks at /usr/share/archiso/initcpio/.
+# The archiso mkinitcpio hooks must be in the airootfs chroot so mkinitcpio
+# can build a working initramfs. ALARM has no archiso package, so we find
+# the hooks from the archiso source we copied into /usr/share/archiso/.
 mkdir -p "$AIROOTFS/usr/lib/initcpio/hooks" "$AIROOTFS/usr/lib/initcpio/install"
-install -m755 /usr/share/archiso/initcpio/hooks/archiso   "$AIROOTFS/usr/lib/initcpio/hooks/archiso"
-install -m755 /usr/share/archiso/initcpio/install/archiso "$AIROOTFS/usr/lib/initcpio/install/archiso"
-echo ">>> Official archiso mkinitcpio hooks installed into airootfs"
+
+_find_hook() {
+    # Try releng airootfs first, then any other location under /usr/share/archiso
+    local name="$1"
+    local found
+    found=$(find /usr/share/archiso -path "*/initcpio/${name}/archiso" | head -1)
+    echo "${found}"
+}
+
+_hook_runtime=$(_find_hook "hooks")
+_hook_install=$(_find_hook "install")
+
+if [[ -n "$_hook_runtime" && -n "$_hook_install" ]]; then
+    install -m755 "$_hook_runtime" "$AIROOTFS/usr/lib/initcpio/hooks/archiso"
+    install -m755 "$_hook_install" "$AIROOTFS/usr/lib/initcpio/install/archiso"
+    echo ">>> Official archiso mkinitcpio hooks installed (from $_hook_runtime)"
+else
+    echo "ERROR: archiso mkinitcpio hooks not found under /usr/share/archiso — listing:"
+    find /usr/share/archiso -name "archiso" 2>/dev/null | sort
+    exit 1
+fi
 
 mkdir -p "$AIROOTFS/etc/mkinitcpio.conf.d"
 cat > "$AIROOTFS/etc/mkinitcpio.conf.d/archiso.conf" <<'MKCONF'