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Add base image fingerprinting for QEMU snapshots

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- Introduced a new function to generate a fingerprint of the base QEMU image, allowing for detection of changes since the last snapshot.
- Updated snapshot handling logic to discard stale snapshots if the base image has changed, improving reliability and efficiency.
- Enhanced the `run-emulator.sh` script to save the fingerprint after a snapshot is created, ensuring accurate tracking of image state.

These changes enhance the snapshot management process in the QEMU emulator, providing better consistency and performance for developers.
This commit is contained in:
mantrakp04 2026-03-18 18:37:16 -07:00
parent 580ff10b9f
commit e3592bb9f5
1 changed files with 23 additions and 2 deletions
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25
docker/local-emulator/qemu/run-emulator.sh
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@ -63,6 +63,17 @@ runtime_iso_path() {
SNAPSHOT_NAME="ready"
IS_SNAPSHOT_RESTORE=false
# Returns a fast fingerprint (size:mtime) of the base QEMU image.
# Used to detect whether the image has changed since the snapshot was saved.
base_image_fingerprint() {
local img="$1"
case "$HOST_OS" in
darwin) stat -f "%z:%m" "$img" 2>/dev/null ;;
linux) stat -c "%s:%Y" "$img" 2>/dev/null ;;
*) stat -f "%z:%m" "$img" 2>/dev/null || stat -c "%s:%Y" "$img" 2>/dev/null ;;
esac
}
vm_has_snapshot() {
[ -f "$VM_DIR/disk.qcow2" ] &&
qemu-img snapshot -l "$VM_DIR/disk.qcow2" 2>/dev/null | grep -q "$SNAPSHOT_NAME"
@ -96,6 +107,7 @@ save_snapshot() {
echo ""
kill "$pid" 2>/dev/null; wait "$pid" 2>/dev/null || true
rm -f "$out_file"
base_image_fingerprint "$(image_path)" > "$VM_DIR/base-image.fingerprint"
log "Snapshot saved."
return 0
fi
@ -202,9 +214,18 @@ build_qemu_cmd() {
mkdir -p "$VM_DIR"
local has_snapshot=false
local fingerprint_file="$VM_DIR/base-image.fingerprint"
local current_fp
current_fp="$(base_image_fingerprint "$base_img")"
if [ -f "$VM_DIR/disk.qcow2" ] && vm_has_snapshot; then
has_snapshot=true
else
if [ -f "$fingerprint_file" ] && [ "$(cat "$fingerprint_file")" = "$current_fp" ]; then
has_snapshot=true
else
warn "QEMU base image has changed — discarding stale snapshot."
rm -f "$VM_DIR/disk.qcow2" "$fingerprint_file"
fi
fi
if [ "$has_snapshot" = "false" ]; then
rm -f "$VM_DIR/disk.qcow2"
qemu-img create -f qcow2 -b "$base_img" -F qcow2 "$VM_DIR/disk.qcow2" >/dev/null
fi