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2026-08-18 09:20:44 +02:00
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+# Test Case: Future Compression Algorithm Rejection
+
+**Test ID**: TC115-unsupported-algorithm
+**Category**: Error Handling
+**Priority**: High
+
+## Objective
+
+Verify mount-time `EOPNOTSUPP` for a legal compressed image whose
+`available_compr_algs` field additionally advertises unknown bit `0x8000`.
+
+## Fixture Qualification
+
+```sh
+work=$(mktemp -d /tmp/repo22-tc115.XXXXXX)
+tests/prepare_error_fixtures.sh "$work/fixtures"
+od -An -tx2 -j 1106 -N 2 "$work/fixtures/future-algorithm.erofs"
+python3 tests/erofs_fixture.py inspect \
+  "$work/fixtures/future-algorithm.erofs"
+grep '^future-algorithm ' "$work/fixtures/fixture-evidence.txt"
+wc -c "$work/fixtures/valid-lz4.erofs" \
+  "$work/fixtures/future-algorithm.erofs"
+sha256 -q "$work/fixtures/future-algorithm.erofs"
+```
+
+The mutator requires `EROFS_FEATURE_INCOMPAT_COMPR_CFGS`, asserts the old
+16-bit field at absolute byte 1106, sets only future bit `0x8000`, recomputes
+CRC32C, and preserves provider length.
+
+## FreeBSD Procedure
+
+```sh
+mkdir "$work/mnt"
+unit=$(mdconfig -a -t vnode -f "$work/fixtures/future-algorithm.erofs")
+set +e
+mount -t erofs -o ro "/dev/$unit" "$work/mnt" \
+  >"$work/mount.out" 2>"$work/mount.err"
+status=$?
+set -e
+test "$status" -ne 0
+set +e
+truss -o "$work/mount.truss" mount -t erofs -o ro "/dev/$unit" \
+  "$work/mnt" >/dev/null 2>&1
+set -e
+grep -E 'nmount.*ERR#45' "$work/mount.truss"
+! mount -p | awk -v path="$work/mnt" '$2 == path { found=1 }
+  END { exit found ? 0 : 1 }'
+mdconfig -d -u "${unit#md}"
+```
+
+## Expected Results
+
+Mount returns errno 45 (`EOPNOTSUPP`), not checksum or media-size failure. No
+mount or md consumer remains.