#!/bin/sh
# DF-0867 setup (MUST run as root): create a HAMMER filesystem image,
# newfs it, mount it, and leave a target file for the trigger to operate on.
# Prints the mount point + target path on stdout for run.sh to consume.
set -e
IMG=/root/df0867_hammer.img
MNT=/mnt/df0867
# Only vn0..vn3 exist as device nodes on this guest; pick a free one.
VND=""
for c in 0 1 2 3; do
	if vnconfig -l "vn$c" 2>/dev/null | grep -q "not in use"; then
		VND="vn$c"; break
	fi
done
[ -n "$VND" ] || { echo "SETUP_FAIL: no free vn device"; exit 4; }

# Clean any prior run
umount "$MNT" 2>/dev/null || true
vnconfig -u "$VND" 2>/dev/null || true
rm -f "$IMG"
mkdir -p "$MNT"

# 2 GiB sparse image (HAMMER1 wants >= ~50MB for freemap/undo; 2G is safe)
truncate -s 2G "$IMG"

# Attach a vnode disk
vnconfig -c "$VND" "$IMG"

# Create a HAMMER filesystem (single volume). -f allows the small image
# (HAMMER normally wants >=10GB; sparse image keeps real usage tiny).
newfs_hammer -f -L df0867 "/dev/$VND"

# Mount read-write
mount_hammer "/dev/$VND" "$MNT"

# Target: a plain file on the freshly mounted HAMMER fs
touch "$MNT/target"

echo "SETUP_OK mnt=$MNT target=$MNT/target vnd=$VND"