Re: [PATCH] grep: simple test for operation in a bare repository

["René Scharfe" <rene.scharfe@lsrfire.ath.cx>]

Am 04.02.2010 00:50, schrieb René Scharfe:
> Am 03.02.2010 19:16, schrieb René Scharfe:
>> Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx>
>> ---
>>  t/t7002-grep.sh |   17 +++++++++++++++++
>>  1 files changed, 17 insertions(+), 0 deletions(-)
> 
> Err, no, that won't do.  Sorry.
> 
> The test script fails to demonstrate the issue I've run into.  It runs
> successfully, but running git grep manually fails:
> 
> 	$ cd t/trash\ directory.t7002-grep/.git/bare_test_repo/
> 	$ git grep bla HEAD
> 	fatal: This operation must be run in a work tree
> 
> I have to dig a bit deeper and try to come back with a better test script.

OK, I have to admit defeat: I can't come up with a test script.  But
the issue is reproducible: git grep in a bare repository fails when
run with a pager.

	$ mkdir /tmp/a
	$ cd /tmp/a
	$ git init
	Initialized empty Git repository in /tmp/a/.git/
	$ echo a >a
	$ git add a
	$ git commit -m.
	[master (root-commit) e11f955] .
	 1 files changed, 1 insertions(+), 0 deletions(-)
	 create mode 100644 a

	$ git clone --bare . ../b
	Initialized empty Git repository in /tmp/b/
	$ cd /tmp/b

	$ git grep a HEAD
	fatal: This operation must be run in a work tree
	$ git grep a HEAD | cat
	HEAD:a:a
	$ git --no-pager grep a HEAD
	HEAD:a:a

Reverting 7e622650 (grep: prepare to run outside of a work tree), or
rather just setting the flag RUN_SETUP for grep in git.c again, makes
the first git grep call succeed, too.

As does the following patch, but I don't know why.  The call chain is
quite deep.  It seems that without the patch the static variable
git_dir in environment.c isn't updated when git finds out that it runs
in a bare repo -- but only if a pager is used.

There are five more sites in git.c, path.c and setup.c where $GIT_DIR
is set directly with setenv().  I wonder if they should better call
set_git_dir() instead, too.


diff --git a/setup.c b/setup.c
index 710e2f3..5fb9b25 100644
--- a/setup.c
+++ b/setup.c
@@ -406,7 +406,7 @@ const char *setup_git_directory_gently(int *nongit_ok)
 				cwd[offset] = '\0';
 				setenv(GIT_DIR_ENVIRONMENT, cwd, 1);
 			} else
-				setenv(GIT_DIR_ENVIRONMENT, ".", 1);
+				set_git_dir(".");
 			check_repository_format_gently(nongit_ok);
 			return NULL;
 		}