[PATCH v7 01/10] t0027: Make commit_chk_wrnNNO() reliable

From: Torsten Bögershausen <redacted>

When the content of a commited file is unchanged and the attributes are changed,
Git may not detect that the next commit must treat the file as changed.
This happens when lstat() doesn't detect a change, since neither inode,
mtime nor size are changed.

Add a singe "Z" character to change the file size (and content).
When the files are compared later in checkout_files(), the "Z" is removed
before the comparison.

Signed-off-by: Torsten Bögershausen <redacted>
---
 Change since v6b:
 - Remove 2 sparse warnings, thanks Ramsay

diff --git a/t/t0027-auto-crlf.sh b/t/t0027-auto-crlf.sh
index f33962b..9fe539b 100755
--- a/t/t0027-auto-crlf.sh
+++ b/t/t0027-auto-crlf.sh

@@ -12,7 +12,7 @@ fi
 
 compare_files () {
 	tr '\015\000' QN <"$1" >"$1".expect &&
-	tr '\015\000' QN <"$2" >"$2".actual &&
+	tr '\015\000' QN <"$2" | tr -d 'Z' >"$2".actual &&
 	test_cmp "$1".expect "$2".actual &&
 	rm "$1".expect "$2".actual
 }

@@ -114,6 +114,7 @@ commit_chk_wrnNNO () {
 	do
 		fname=${pfx}_$f.txt &&
 		cp $f $fname &&
+		printf Z >>"$fname" &&
 		git -c core.autocrlf=$crlf add $fname 2>/dev/null &&
 		git -c core.autocrlf=$crlf commit -m "commit_$fname" $fname >"${pfx}_$f.err" 2>&1
 	done

-- 
2.0.0.rc1.6318.g0c2c796