test code v1

tests/TC139-fifo-acl-xattr-readonly.md

@@ -0,0 +1,31 @@
+# Test Case: FIFO ACL and xattr read-only VOPs
+
+**Test ID**: TC139-fifo-acl-xattr-readonly
+**Fixture**: `basic.erofs`, `/fifo-node`
+
+## Objective
+
+Verify FIFO stat, ACL, and xattr reads without opening FIFO data, and require
+read-only errors for all mutations. The transformer must record the regular
+placeholder to FIFO `i_mode` change and ACL body fields.
+
+## Manual steps
+
+```sh
+stat -f 'type=%HT mode=%Sp size=%z inode=%i' /mnt/repo22-g4/fifo-node
+getfacl -n /mnt/repo22-g4/fifo-node
+lsextattr system /mnt/repo22-g4/fifo-node
+lsextattr user /mnt/repo22-g4/fifo-node
+getextattr -qq -x system posix_acl_access /mnt/repo22-g4/fifo-node
+getextattr -qq -x user fifo_note /mnt/repo22-g4/fifo-node
+truss -o /tmp/tc139-acl.truss setfacl -m u::rwx /mnt/repo22-g4/fifo-node
+truss -o /tmp/tc139-set.truss setextattr user repo22 changed \
+  /mnt/repo22-g4/fifo-node
+truss -o /tmp/tc139-del.truss rmextattr system posix_acl_access \
+  /mnt/repo22-g4/fifo-node
+```
+
+## Expected results
+
+Stat reports FIFO, reads return the exact ACL and `fifo-readonly-xattr`, and
+all three mutations return `EROFS` (30). Nothing blocks or logs a trap. Clean up.