tests: cksum: check truncated digests are flagged as malformed

* tests/cksum/cksum-c.sh: A tagged checksum line with a valid algorithm
but a hex digest of the wrong (truncated) length must be reported as
improperly formatted rather than as a checksum mismatch (FAILED).
See https://github.com/uutils/coreutils/issues/6576
https://github.com/coreutils/coreutils/pull/273

diff --git a/tests/cksum/cksum-c.sh b/tests/cksum/cksum-c.sh
index 49d6a84d3bb646e51574f4782eac6604a7d5ff5f..496ab5f62929226847234ad2243a2c0ca848156e 100755 (executable)
--- a/tests/cksum/cksum-c.sh
+++ b/tests/cksum/cksum-c.sh
@@ -221,4 +221,22 @@ if strace -o /dev/null -P _ -e /read,splice -e fault=all:error=EIO true; then
   compare exp err || fail=1
 fi
 
+# A tagged line with a valid algorithm but a digest of the wrong
+# (truncated) length must be flagged as improperly formatted, not
+# reported as a checksum mismatch (FAILED).
+touch ff1 ff2 ff3 || framework_failure_
+cksum -a sha256 ff1 ff2 ff3 > trunc.sum || fail=1
+# Truncate the digest of the last two lines by one hex character.
+sed '2,3 s/.$//' trunc.sum > trunc-bad.sum || framework_failure_
+cksum --check trunc-bad.sum > out 2> err || fail=1
+grep 'ff1: OK' out || fail=1
+grep 'FAILED' out && fail=1
+grep 'WARNING: 2 lines are improperly formatted' err || fail=1
+# With --warn the offending lines are reported individually.
+cksum --warn --check trunc-bad.sum > out 2> err || fail=1
+grep 'trunc-bad.sum: 2: improperly formatted SHA256 checksum line' err || fail=1
+grep 'trunc-bad.sum: 3: improperly formatted SHA256 checksum line' err || fail=1
+# With --strict a malformed line makes the exit status non-zero.
+returns_ 1 cksum --strict --check trunc-bad.sum > out 2> err || fail=1
+
 Exit $fail