Initial Commit

vm/host/owuivm-teardown

@@ -0,0 +1,39 @@
+#!/bin/bash
+# =====================================================================
+# Runs from ExecStopPost=, so it happens however qemu died - clean exit,
+# SIGTERM, SIGKILL, OOM, or a crash. That is the whole reason it exists
+# as a unit hook rather than as code in vmd: the archived sub-agent stack
+# recorded a cancellation and killed nothing, and the run carried on.
+#
+# It runs as owuivm, which owns the overlay and the session directory's
+# contents, so it needs no privilege at all to undo its own mess. vmd
+# reaps again when it starts; neither is trusted to be the one that ran.
+#
+# Deliberately never fails: a teardown that exits non-zero puts the unit
+# into `failed` and the next `systemctl start` needs a reset-failed first,
+# which turns a transient into a wedge.
+# =====================================================================
+set -u
+
+SESSION="${OWUIVM_SESSION:-}"
+[[ "$SESSION" =~ ^[0-9a-f]{32}$ ]] || exit 0
+
+RUN="/run/owuivm/$SESSION"
+
+# The overlay is disposable by definition - every session starts from the
+# frozen base - so it goes unconditionally rather than being kept "just
+# in case". Anything worth keeping was written to the project share.
+DISK="${OWUIVM_DISK:-}"
+case "$DISK" in
+  @POOL_ROOT@/vmrun/*.qcow2) rm -f -- "$DISK" 2>/dev/null ;;
+esac
+
+rm -f -- "$RUN"/qmp.sock "$RUN"/ga.sock "$RUN"/broker.sock \
+         "$RUN"/vnc.sock "$RUN"/OVMF_VARS.fd 2>/dev/null
+
+# Tells vmd the machine is gone without it having to race systemd's own
+# state, and gives the orphan reaper something to find if vmd was not
+# running at the time.
+: > "$RUN/STOPPED" 2>/dev/null
+
+exit 0