[PATCH] Test case for "git diff" outside a git repo

[PATCH] Test case for "git diff" outside a git repo

[Steven Grimm]

Signed-off-by: Steven Grimm <koreth@midwinter.com>
---
	git-diff --quiet is pretty broken right now. If you do
	"strace git diff --quiet file1 file2" you will see that
	it never calls open() on either file! And it always
	returns a zero exit code whether or not the files are
	different.

	I'm trying to follow the code to figure out what's going on,
	but meanwhile, here's a test case. Perhaps someone more
	familiar with the diff code will beat me to a fix.

 t/t4021-diff-norepo.sh |   26 ++++++++++++++++++++++++++
 1 files changed, 26 insertions(+), 0 deletions(-)
 create mode 100755 t/t4021-diff-norepo.sh

diff --git a/t/t4021-diff-norepo.sh b/t/t4021-diff-norepo.sh
new file mode 100755
index 0000000..dfee3d7
--- /dev/null
+++ b/t/t4021-diff-norepo.sh
@@ -0,0 +1,26 @@
+#!/bin/sh
+
+test_description='test git diff outside a repo'
+
+. ./test-lib.sh
+
+rm -rf .git
+
+test_expect_success setup '
+
+	echo content1 >file1a &&
+	echo content1 >file1b &&
+	echo content2 >file2
+'
+
+test_expect_success 'zero return value with --quiet for different files' '
+
+	git diff --quiet file1a file2
+'
+
+test_expect_success 'nonzero return value with --quiet for identical files' '
+
+	! git diff --quiet file1a file1b >/dev/null
+'
+
+test_done
-- 
1.5.3.rc2.4.g726f9

Re: [PATCH] Test case for "git diff" outside a git repo

[Junio C Hamano]

Junio C Hamano <gitster@pobox.com> writes:

> Steven Grimm <koreth@midwinter.com> writes:
>
>> Signed-off-by: Steven Grimm <koreth@midwinter.com>
>> ---
>> 	git-diff --quiet is pretty broken right now. If you do
>> 	"strace git diff --quiet file1 file2" you will see that
>> 	it never calls open() on either file! And it always
>> 	returns a zero exit code whether or not the files are
>> 	different.
>>
>> 	I'm trying to follow the code to figure out what's going on,
>> 	but meanwhile, here's a test case. Perhaps someone more
>> 	familiar with the diff code will beat me to a fix.

The code to do "untracked diff" is an ugly stepchild and not
really part of git-diff proper.  In fact, --quiet also is an
afterthought and I would not be too surprised if the "untracked
diff" code does not work with it.

>> diff --git a/t/t4021-diff-norepo.sh b/t/t4021-diff-norepo.sh
>> new file mode 100755
>> index 0000000..dfee3d7
>> --- /dev/null
>> +++ b/t/t4021-diff-norepo.sh
>> @@ -0,0 +1,26 @@
>> +#!/bin/sh
>> +
>> +test_description='test git diff outside a repo'
>> +
>> +. ./test-lib.sh
>> +
>> +rm -rf .git

Unless you are testing the t/ directory and git.git suite from a
tarball, the only effect of this is to make t/trash controlled
by its ../../.git repository (i.e. the git.git repository).  You
are still inside a git repository.

Re: [PATCH] Test case for "git diff" outside a git repo

[Johannes Schindelin]

Hi,

On Mon, 23 Jul 2007, Junio C Hamano wrote:

> Junio C Hamano <gitster@pobox.com> writes:
> 
> > Steven Grimm <koreth@midwinter.com> writes:
> >
> >> Signed-off-by: Steven Grimm <koreth@midwinter.com>
> >> ---
> >> 	git-diff --quiet is pretty broken right now. If you do
> >> 	"strace git diff --quiet file1 file2" you will see that
> >> 	it never calls open() on either file! And it always
> >> 	returns a zero exit code whether or not the files are
> >> 	different.
> >>
> >> 	I'm trying to follow the code to figure out what's going on,
> >> 	but meanwhile, here's a test case. Perhaps someone more
> >> 	familiar with the diff code will beat me to a fix.
> 
> The code to do "untracked diff" is an ugly stepchild and not really part 
> of git-diff proper.  In fact, --quiet also is an afterthought and I 
> would not be too surprised if the "untracked diff" code does not work 
> with it.

Not that ugly, mind you.  Every third day or so I congratulate myself for 
having "git diff --color-words" or "git diff -M", without having to suffer 
initialising a git repository.

But yes, I agree, the --quiet code came after the --no-index code, and 
thus it is well possible that the latter ignores the former.

> >> diff --git a/t/t4021-diff-norepo.sh b/t/t4021-diff-norepo.sh
> >> new file mode 100755
> >> index 0000000..dfee3d7
> >> --- /dev/null
> >> +++ b/t/t4021-diff-norepo.sh
> >> @@ -0,0 +1,26 @@
> >> +#!/bin/sh
> >> +
> >> +test_description='test git diff outside a repo'
> >> +
> >> +. ./test-lib.sh
> >> +
> >> +rm -rf .git
> 
> Unless you are testing the t/ directory and git.git suite from a 
> tarball, the only effect of this is to make t/trash controlled by its 
> ../../.git repository (i.e. the git.git repository).  You are still 
> inside a git repository.

Yes, this is no good.

However, you can force --no-index.  IMHO that is the way to go.

Ciao,
Dscho