t: make many tests depend less on the refs being files

Many tests are very focused on the file system representation of the
loose and packed refs code. As there are plans to implement other
ref storage systems, let's migrate these tests to a form that test
the intent of the refs storage system instead of it internals.

This will make clear to readers that these tests do not depend on
which ref backend is used.

The internals of the loose refs backend are still tested in
t1400-update-ref.sh, whereas the tests changed in this patch focus
on testing other aspects.

This patch just takes care of many low hanging fruits. It does not
try to completely solves the issue.

Helped-by: Stefan Beller <sbeller@google.com>
Helped-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Signed-off-by: David Turner <dturner@twopensource.com>
Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/lib-t6000.sh

@@ -4,11 +4,11 @@ mkdir -p .git/refs/tags
 
 >sed.script
 
-# Answer the sha1 has associated with the tag. The tag must exist in .git/refs/tags
+# Answer the sha1 has associated with the tag. The tag must exist under refs/tags
 tag () {
 	_tag=$1
-	test -f ".git/refs/tags/$_tag" || error "tag: \"$_tag\" does not exist"
-	cat ".git/refs/tags/$_tag"
+	git rev-parse --verify "refs/tags/$_tag" ||
+	error "tag: \"$_tag\" does not exist"
 }
 
 # Generate a commit using the text specified to make it unique and the tree

t/t1401-symbolic-ref.sh

@@ -65,7 +65,7 @@ reset_to_sane
 test_expect_success 'symbolic-ref fails to delete real ref' '
 	echo "fatal: Cannot delete refs/heads/foo, not a symbolic ref" >expect &&
 	test_must_fail git symbolic-ref -d refs/heads/foo >actual 2>&1 &&
-	test_path_is_file .git/refs/heads/foo &&
+	git rev-parse --verify refs/heads/foo &&
 	test_cmp expect actual
 '
 reset_to_sane

t/t3200-branch.sh

@@ -233,34 +233,34 @@ test_expect_success 'git branch -M master2 master2 should work when master is ch
 
 test_expect_success 'git branch -v -d t should work' '
 	git branch t &&
-	test_path_is_file .git/refs/heads/t &&
+	git rev-parse --verify refs/heads/t &&
 	git branch -v -d t &&
-	test_path_is_missing .git/refs/heads/t
+	test_must_fail git rev-parse --verify refs/heads/t
 '
 
 test_expect_success 'git branch -v -m t s should work' '
 	git branch t &&
-	test_path_is_file .git/refs/heads/t &&
+	git rev-parse --verify refs/heads/t &&
 	git branch -v -m t s &&
-	test_path_is_missing .git/refs/heads/t &&
-	test_path_is_file .git/refs/heads/s &&
+	test_must_fail git rev-parse --verify refs/heads/t &&
+	git rev-parse --verify refs/heads/s &&
 	git branch -d s
 '
 
 test_expect_success 'git branch -m -d t s should fail' '
 	git branch t &&
-	test_path_is_file .git/refs/heads/t &&
+	git rev-parse refs/heads/t &&
 	test_must_fail git branch -m -d t s &&
 	git branch -d t &&
-	test_path_is_missing .git/refs/heads/t
+	test_must_fail git rev-parse refs/heads/t
 '
 
 test_expect_success 'git branch --list -d t should fail' '
 	git branch t &&
-	test_path_is_file .git/refs/heads/t &&
+	git rev-parse refs/heads/t &&
 	test_must_fail git branch --list -d t &&
 	git branch -d t &&
-	test_path_is_missing .git/refs/heads/t
+	test_must_fail git rev-parse refs/heads/t
 '
 
 test_expect_success 'git branch --list -v with --abbrev' '

t/t3903-stash.sh

@@ -726,7 +726,7 @@ test_expect_success 'store updates stash ref and reflog' '
 	git reset --hard &&
 	! grep quux bazzy &&
 	git stash store -m quuxery $STASH_ID &&
-	test $(cat .git/refs/stash) = $STASH_ID &&
+	test $(git rev-parse stash) = $STASH_ID &&
 	git reflog --format=%H stash| grep $STASH_ID &&
 	git stash pop &&
 	grep quux bazzy

t/t5500-fetch-pack.sh

@@ -30,7 +30,7 @@ add () {
 	test_tick &&
 	commit=$(echo "$text" | git commit-tree $tree $parents) &&
 	eval "$name=$commit; export $name" &&
-	echo $commit > .git/refs/heads/$branch &&
+	git update-ref "refs/heads/$branch" "$commit" &&
 	eval ${branch}TIP=$commit
 }
 
@@ -45,10 +45,10 @@ pull_to_client () {
 
 			case "$heads" in
 			    *A*)
-				    echo $ATIP > .git/refs/heads/A;;
+				    git update-ref refs/heads/A "$ATIP";;
 			esac &&
 			case "$heads" in *B*)
-			    echo $BTIP > .git/refs/heads/B;;
+			    git update-ref refs/heads/B "$BTIP";;
 			esac &&
 			git symbolic-ref HEAD refs/heads/$(echo $heads \
 				| sed -e "s/^\(.\).*$/\1/") &&
@@ -92,8 +92,8 @@ test_expect_success 'setup' '
 		cur=$(($cur+1))
 	done &&
 	add B1 $A1 &&
-	echo $ATIP > .git/refs/heads/A &&
-	echo $BTIP > .git/refs/heads/B &&
+	git update-ref refs/heads/A "$ATIP" &&
+	git update-ref refs/heads/B "$BTIP" &&
 	git symbolic-ref HEAD refs/heads/B
 '
 

t/t5510-fetch.sh

@@ -63,7 +63,7 @@ test_expect_success "fetch test" '
 	git commit -a -m "updated by origin" &&
 	cd two &&
 	git fetch &&
-	test -f .git/refs/heads/one &&
+	git rev-parse --verify refs/heads/one &&
 	mine=$(git rev-parse refs/heads/one) &&
 	his=$(cd ../one && git rev-parse refs/heads/master) &&
 	test "z$mine" = "z$his"
@@ -73,8 +73,8 @@ test_expect_success "fetch test for-merge" '
 	cd "$D" &&
 	cd three &&
 	git fetch &&
-	test -f .git/refs/heads/two &&
-	test -f .git/refs/heads/one &&
+	git rev-parse --verify refs/heads/two &&
+	git rev-parse --verify refs/heads/one &&
 	master_in_two=$(cd ../two && git rev-parse master) &&
 	one_in_two=$(cd ../two && git rev-parse one) &&
 	{

t/t6010-merge-base.sh

@@ -34,7 +34,7 @@ doit () {
 
 	commit=$(echo $NAME | git commit-tree $T $PARENTS) &&
 
-	echo $commit >.git/refs/tags/$NAME &&
+	git update-ref "refs/tags/$NAME" "$commit" &&
 	echo $commit
 }
 

t/t7201-co.sh

@@ -65,7 +65,7 @@ test_expect_success setup '
 test_expect_success "checkout from non-existing branch" '
 
 	git checkout -b delete-me master &&
-	rm .git/refs/heads/delete-me &&
+	git update-ref -d --no-deref refs/heads/delete-me &&
 	test refs/heads/delete-me = "$(git symbolic-ref HEAD)" &&
 	git checkout master &&
 	test refs/heads/master = "$(git symbolic-ref HEAD)"

t/t9104-git-svn-follow-parent.sh

@@ -213,7 +213,8 @@ test_expect_success "multi-fetch continues to work" "
 	"
 
 test_expect_success "multi-fetch works off a 'clean' repository" '
-	rm -r "$GIT_DIR/svn" "$GIT_DIR/refs/remotes" "$GIT_DIR/logs" &&
+	rm -rf "$GIT_DIR/svn" "$GIT_DIR/refs/remotes" &&
+	git reflog expire --all --expire=all &&
 	mkdir "$GIT_DIR/svn" &&
 	git svn multi-fetch
 	'