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