autocrlf: Make it work also for un-normalized repositories

Previously, autocrlf would only work well for normalized
repositories. Any text files that contained CRLF in the repository
would cause problems, and would be modified when handled with
core.autocrlf set.

Change autocrlf to not do any conversions to files that in the
repository already contain a CR. git with autocrlf set will never
create such a file, or change a LF only file to contain CRs, so the
(new) assumption is that if a file contains a CR, it is intentional,
and autocrlf should not change that.

The following sequence should now always be a NOP even with autocrlf
set (assuming a clean working directory):

git checkout <something>
touch *
git add -A .    (will add nothing)
git commit      (nothing to commit)

Previously this would break for any text file containing a CR.

Some of you may have been folowing Eyvind's excellent thread about
trying to make end-of-line translation in git a bit smoother.

I decided to attack the problem from a different angle: Is it possible
to make autocrlf behave non-destructively for all the previous problem cases?

Stealing the problem from Eyvind's initial mail (paraphrased and
summarized a bit):

1. Setting autocrlf globally is a pain since autocrlf does not work well
   with CRLF in the repo
2. Setting it in individual repos is hard since you do it "too late"
   (the clone will get it wrong)
3. If someone checks in a file with CRLF later, you get into problems again
4. If a repository once has contained CRLF, you can't tell autocrlf
   at which commit everything is sane again
5. autocrlf does needless work if you know that all your users want
   the same EOL style.

I belive that this patch makes autocrlf a safe (and good) default
setting for Windows, and this solves problems 1-4 (it solves 2 by being
set by default, which is early enough for clone).

I implemented it by looking for CR charactes in the index, and
aborting any conversion attempt if this is found.

Signed-off-by: Finn Arne Gangstad <finag@pvv.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 52 insertions, 0 deletions

diff --git a/t/t0020-crlf.sh b/t/t0020-crlf.sh
index c3e7e322a..234a94f3e 100755
--- a/t/t0020-crlf.sh
+++ b/t/t0020-crlf.sh
@@ -453,5 +453,57 @@ test_expect_success 'invalid .gitattributes (must not crash)' '
 	git diff
 
 '
+# Some more tests here to add new autocrlf functionality.
+# We want to have a known state here, so start a bit from scratch
+
+test_expect_success 'setting up for new autocrlf tests' '
+	git config core.autocrlf false &&
+	git config core.safecrlf false &&
+	rm -rf .????* * &&
+	for w in I am all LF; do echo $w; done >alllf &&
+	for w in Oh here is CRLFQ in text; do echo $w; done | q_to_cr >mixed &&
+	for w in I am all CRLF; do echo $w; done | append_cr >allcrlf &&
+	git add -A . &&
+	git commit -m "alllf, allcrlf and mixed only" &&
+	git tag -a -m "message" autocrlf-checkpoint
+'
+
+test_expect_success 'report no change after setting autocrlf' '
+	git config core.autocrlf true &&
+	touch * &&
+	git diff --exit-code
+'
+
+test_expect_success 'files are clean after checkout' '
+	rm * &&
+	git checkout -f &&
+	git diff --exit-code
+'
+
+cr_to_Q_no_NL () {
+    tr '\015' Q | tr -d '\012'
+}
+
+test_expect_success 'LF only file gets CRLF with autocrlf' '
+	test "$(cr_to_Q_no_NL < alllf)" = "IQamQallQLFQ"
+'
+
+test_expect_success 'Mixed file is still mixed with autocrlf' '
+	test "$(cr_to_Q_no_NL < mixed)" = "OhhereisCRLFQintext"
+'
+
+test_expect_success 'CRLF only file has CRLF with autocrlf' '
+	test "$(cr_to_Q_no_NL < allcrlf)" = "IQamQallQCRLFQ"
+'
+
+test_expect_success 'New CRLF file gets LF in repo' '
+	tr -d "\015" < alllf | append_cr > alllf2 &&
+	git add alllf2 &&
+	git commit -m "alllf2 added" &&
+	git config core.autocrlf false &&
+	rm * &&
+	git checkout -f &&
+	test_cmp alllf alllf2
+'
 
 test_done