Re: bug? in checkout with ambiguous refnames

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On Fri, Jan 07, 2011 at 02:49:09PM -0500, Jeff King wrote:

> That being said, it probably would make more sense for "git checkout" to
> prefer branches to tags. That's probably going to take a lot more
> surgery, and we're in -rc right now. So I think the best thing to do is
> to fix the broken message and add some tests, and then if somebody wants
> to revisit it with a larger patch, they can do so on top.
> 
> I'll work on the first part and post a patch in a few minutes.

Ah, never mind. After reading Junio's response, it looks like we already
try to do the right thing in checkout, but it's just broken. So forget
my two-step plan.

Here is the test script I worked out which shows the issue (and checks
that the right messages are shown to the user):

---
 t/t2019-checkout-amiguous-ref.sh |   32 ++++++++++++++++++++++++++++++++
 1 files changed, 32 insertions(+), 0 deletions(-)
 create mode 100755 t/t2019-checkout-amiguous-ref.sh

diff --git a/t/t2019-checkout-amiguous-ref.sh b/t/t2019-checkout-amiguous-ref.sh
new file mode 100755
index 0000000..12edce8
--- /dev/null
+++ b/t/t2019-checkout-amiguous-ref.sh
@@ -0,0 +1,32 @@
+#!/bin/sh
+
+test_description='checkout handling of ambiguous (branch/tag) refs'
+. ./test-lib.sh
+
+test_expect_success 'setup ambiguous refs' '
+	test_commit branch file &&
+	git branch ambiguity &&
+	test_commit tag file &&
+	git tag ambiguity &&
+	test_commit other file
+'
+
+test_expect_success 'checkout ambiguous ref succeeds' '
+	git checkout ambiguity >stdout 2>stderr
+'
+
+test_expect_success 'checkout produces ambiguity warning' '
+	grep "warning.*ambiguous" stderr
+'
+
+test_expect_failure 'checkout chooses branch over tag' '
+	echo branch >expect &&
+	test_cmp expect file
+'
+
+test_expect_success 'checkout reports switch to detached HEAD' '
+	grep "Switched to branch" stderr &&
+	! grep "^HEAD is now at" stderr
+'
+
+test_done
-- 
1.7.4.rc1.23.g84303

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