55 lines
1.6 KiB
Markdown
55 lines
1.6 KiB
Markdown
# Test Case: Empty File Read
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**Test ID**: TC120-empty-file
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**Category**: Boundary & Stress
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**Priority**: Medium
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**Regression**: None
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## Objective
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Verify exact zero-length inode, EOF, seek, hash, and close behavior.
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## Preconditions
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- Complete `G7-MANUAL-SETUP.md`.
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- Load the exact G7 KLD by full path.
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- Verify the guest copy of `SOURCE-SHA256SUMS` before mounting.
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## Manual Steps
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```sh
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G7=/root/repo22-g7
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FIX=$G7/fixtures
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SRC=$FIX/sources/boundaries/empty.bin
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IMAGE=$FIX/images/boundaries.erofs
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MNT=/mnt/repo22-g7-tc120
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E=$G7/evidence/TC120
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mkdir -p "$MNT" "$E"
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unit=$(mdconfig -a -t vnode -f "$IMAGE")
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printf 'md=%s\n' "$unit" | tee "$E/provider.txt"
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mount -t erofs -o ro "/dev/$unit" "$MNT"
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stat -f 'size=%z mode=%Sp name=%N' "$SRC" "$MNT/empty.bin" \
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| tee "$E/stat.txt"
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source_hash=$(sha256 -q "$SRC")
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target_hash=$(sha256 -q "$MNT/empty.bin")
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printf 'source=%s\ntarget=%s\n' "$source_hash" "$target_hash" \
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| tee "$E/hashes.txt"
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test "$source_hash" = "$target_hash"
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cmp "$SRC" "$MNT/empty.bin"
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"$G7/g7_probe" empty "$MNT/empty.bin" | tee "$E/probe.txt"
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umount "$MNT"
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mdconfig -d -u "${unit#md}"
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test -z "$(mount -p | awk -v m="$MNT" '$2 == m { print }')"
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test -z "$(mdconfig -l | tr ' ' '\n' | grep -x "$unit")"
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```
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## PASS Gate
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- Both sizes are exactly 0 and both SHA256 values are the empty-file hash.
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- `cmp` exits 0.
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- The probe reports `read_bytes=0`, both seek offsets 0, and exit 0.
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- The exact mount and md provider are absent after cleanup.
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Any kernel panic, trap, hang, or unexpected EROFS dmesg error is KFAIL and
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requires an issue report without changing `src`.
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