t: drop useless sane_unset GIT_* calls

Several test scripts manually unset GIT_CONFIG and other
GIT_* variables. These are generally taken care of for us by
test-lib.sh already.

Unsetting these is not only useless, but can be confusing to
a reader, who may wonder why some tests in a script unset
them and others do not (t0001 is particularly guilty of this
inconsistency, probably because many of its tests predate
the test-lib.sh environment-cleansing).

Note that we cannot always get rid of such unsetting. For
example, t9130 can drop the GIT_CONFIG unset, but not the
GIT_DIR one, because lib-git-svn.sh sets the latter. And in
t1000, we unset GIT_TEMPLATE_DIR, which is explicitly
initialized by test-lib.sh.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t0001-init.sh

@@ -25,7 +25,6 @@ check_config () {
 
 test_expect_success 'plain' '
 	(
-		sane_unset GIT_DIR GIT_WORK_TREE &&
 		mkdir plain &&
 		cd plain &&
 		git init
@@ -35,7 +34,6 @@ test_expect_success 'plain' '
 
 test_expect_success 'plain nested in bare' '
 	(
-		sane_unset GIT_DIR GIT_WORK_TREE &&
 		git init --bare bare-ancestor.git &&
 		cd bare-ancestor.git &&
 		mkdir plain-nested &&
@@ -47,7 +45,6 @@ test_expect_success 'plain nested in bare' '
 
 test_expect_success 'plain through aliased command, outside any git repo' '
 	(
-		sane_unset GIT_DIR GIT_WORK_TREE &&
 		HOME=$(pwd)/alias-config &&
 		export HOME &&
 		mkdir alias-config &&
@@ -65,7 +62,6 @@ test_expect_success 'plain through aliased command, outside any git repo' '
 
 test_expect_failure 'plain nested through aliased command' '
 	(
-		sane_unset GIT_DIR GIT_WORK_TREE &&
 		git init plain-ancestor-aliased &&
 		cd plain-ancestor-aliased &&
 		echo "[alias] aliasedinit = init" >>.git/config &&
@@ -78,7 +74,6 @@ test_expect_failure 'plain nested through aliased command' '
 
 test_expect_failure 'plain nested in bare through aliased command' '
 	(
-		sane_unset GIT_DIR GIT_WORK_TREE &&
 		git init --bare bare-ancestor-aliased.git &&
 		cd bare-ancestor-aliased.git &&
 		echo "[alias] aliasedinit = init" >>config &&
@@ -91,7 +86,6 @@ test_expect_failure 'plain nested in bare through aliased command' '
 
 test_expect_success 'plain with GIT_WORK_TREE' '
 	if (
-		sane_unset GIT_DIR &&
 		mkdir plain-wt &&
 		cd plain-wt &&
 		GIT_WORK_TREE=$(pwd) git init
@@ -104,7 +98,6 @@ test_expect_success 'plain with GIT_WORK_TREE' '
 
 test_expect_success 'plain bare' '
 	(
-		sane_unset GIT_DIR GIT_WORK_TREE GIT_CONFIG &&
 		mkdir plain-bare-1 &&
 		cd plain-bare-1 &&
 		git --bare init
@@ -114,7 +107,6 @@ test_expect_success 'plain bare' '
 
 test_expect_success 'plain bare with GIT_WORK_TREE' '
 	if (
-		sane_unset GIT_DIR GIT_CONFIG &&
 		mkdir plain-bare-2 &&
 		cd plain-bare-2 &&
 		GIT_WORK_TREE=$(pwd) git --bare init
@@ -128,7 +120,6 @@ test_expect_success 'plain bare with GIT_WORK_TREE' '
 test_expect_success 'GIT_DIR bare' '
 
 	(
-		sane_unset GIT_CONFIG &&
 		mkdir git-dir-bare.git &&
 		GIT_DIR=git-dir-bare.git git init
 	) &&
@@ -138,7 +129,6 @@ test_expect_success 'GIT_DIR bare' '
 test_expect_success 'init --bare' '
 
 	(
-		sane_unset GIT_DIR GIT_WORK_TREE GIT_CONFIG &&
 		mkdir init-bare.git &&
 		cd init-bare.git &&
 		git init --bare
@@ -149,7 +139,6 @@ test_expect_success 'init --bare' '
 test_expect_success 'GIT_DIR non-bare' '
 
 	(
-		sane_unset GIT_CONFIG &&
 		mkdir non-bare &&
 		cd non-bare &&
 		GIT_DIR=.git git init
@@ -160,7 +149,6 @@ test_expect_success 'GIT_DIR non-bare' '
 test_expect_success 'GIT_DIR & GIT_WORK_TREE (1)' '
 
 	(
-		sane_unset GIT_CONFIG &&
 		mkdir git-dir-wt-1.git &&
 		GIT_WORK_TREE=$(pwd) GIT_DIR=git-dir-wt-1.git git init
 	) &&
@@ -170,7 +158,6 @@ test_expect_success 'GIT_DIR & GIT_WORK_TREE (1)' '
 test_expect_success 'GIT_DIR & GIT_WORK_TREE (2)' '
 
 	if (
-		sane_unset GIT_CONFIG &&
 		mkdir git-dir-wt-2.git &&
 		GIT_WORK_TREE=$(pwd) GIT_DIR=git-dir-wt-2.git git --bare init
 	)
@@ -183,8 +170,6 @@ test_expect_success 'GIT_DIR & GIT_WORK_TREE (2)' '
 test_expect_success 'reinit' '
 
 	(
-		sane_unset GIT_CONFIG GIT_WORK_TREE GIT_CONFIG &&
-
 		mkdir again &&
 		cd again &&
 		git init >out1 2>err1 &&

t/t9130-git-svn-authors-file.sh

@@ -97,7 +97,6 @@ test_expect_success 'fresh clone with svn.authors-file in config' '
 		test x = x"$(git config svn.authorsfile)" &&
 		test_config="$HOME"/.gitconfig &&
 		sane_unset GIT_DIR &&
-		sane_unset GIT_CONFIG &&
 		git config --global \
 		  svn.authorsfile "$HOME"/svn-authors &&
 		test x"$HOME"/svn-authors = x"$(git config svn.authorsfile)" &&

t/t9400-git-cvsserver-server.sh

@@ -25,7 +25,6 @@ perl -e 'use DBI; use DBD::SQLite' >/dev/null 2>&1 || {
     test_done
 }
 
-unset GIT_DIR GIT_CONFIG
 WORKDIR=$(pwd)
 SERVERDIR=$(pwd)/gitcvs.git
 git_config="$SERVERDIR/config"