read-tree: further loosen "working file will be lost" check.

This follows up commit ed93b449 where we removed overcautious
"working file will be lost" check.

A new option "--exclude-per-directory=.gitignore" can be used to
tell the "git-read-tree" command that the user does not mind
losing contents in untracked files in the working tree, if they
need to be overwritten by a merge (either a two-way "switch
branches" merge, or a three-way merge).

Signed-off-by: Junio C Hamano <junkio@cox.net>

1 files changed, 74 insertions, 8 deletions

diff --git a/t/t1004-read-tree-m-u-wf.sh b/t/t1004-read-tree-m-u-wf.sh
index 018fbea45..4f664f6ad 100755
--- a/t/t1004-read-tree-m-u-wf.sh
+++ b/t/t1004-read-tree-m-u-wf.sh
@@ -8,23 +8,27 @@ test_description='read-tree -m -u checks working tree files'
 
 test_expect_success 'two-way setup' '
 
+	mkdir subdir &&
 	echo >file1 file one &&
 	echo >file2 file two &&
-	git update-index --add file1 file2 &&
+	echo >subdir/file1 file one in subdirectory &&
+	echo >subdir/file2 file two in subdirectory &&
+	git update-index --add file1 file2 subdir/file1 subdir/file2 &&
 	git commit -m initial &&
 
 	git branch side &&
 	git tag -f branch-point &&
 
 	echo file2 is not tracked on the master anymore &&
-	rm -f file2 &&
-	git update-index --remove file2 &&
-	git commit -a -m "master removes file2"
+	rm -f file2 subdir/file2 &&
+	git update-index --remove file2 subdir/file2 &&
+	git commit -a -m "master removes file2 and subdir/file2"
 '
 
 test_expect_success 'two-way not clobbering' '
 
 	echo >file2 master creates untracked file2 &&
+	echo >subdir/file2 master creates untracked subdir/file2 &&
 	if err=`git read-tree -m -u master side 2>&1`
 	then
 		echo should have complained
@@ -34,20 +38,82 @@ test_expect_success 'two-way not clobbering' '
 	fi
 '
 
+echo file2 >.gitignore
+
+test_expect_success 'two-way with incorrect --exclude-per-directory (1)' '
+
+	if err=`git read-tree -m --exclude-per-directory=.gitignore master side 2>&1`
+	then
+		echo should have complained
+		false
+	else
+		echo "happy to see $err"
+	fi
+'
+
+test_expect_success 'two-way with incorrect --exclude-per-directory (2)' '
+
+	if err=`git read-tree -m -u --exclude-per-directory=foo --exclude-per-directory=.gitignore master side 2>&1`
+	then
+		echo should have complained
+		false
+	else
+		echo "happy to see $err"
+	fi
+'
+
+test_expect_success 'two-way clobbering a ignored file' '
+
+	git read-tree -m -u --exclude-per-directory=.gitignore master side
+'
+
+rm -f .gitignore
+
 # three-tree test
 
-test_expect_success 'three-way not complaining' '
+test_expect_success 'three-way not complaining on an untracked path in both' '
 
-	rm -f file2 &&
+	rm -f file2 subdir/file2 &&
 	git checkout side &&
 	echo >file3 file three &&
-	git update-index --add file3 &&
-	git commit -a -m "side adds file3" &&
+	echo >subdir/file3 file three &&
+	git update-index --add file3 subdir/file3 &&
+	git commit -a -m "side adds file3 and removes file2" &&
 
 	git checkout master &&
 	echo >file2 file two is untracked on the master side &&
+	echo >subdir/file2 file two is untracked on the master side &&
 
 	git-read-tree -m -u branch-point master side
 '
 
+test_expect_success 'three-way not cloberring a working tree file' '
+
+	git reset --hard &&
+	rm -f file2 subdir/file2 file3 subdir/file3 &&
+	git checkout master &&
+	echo >file3 file three created in master, untracked &&
+	echo >subdir/file3 file three created in master, untracked &&
+	if err=`git read-tree -m -u branch-point master side 2>&1`
+	then
+		echo should have complained
+		false
+	else
+		echo "happy to see $err"
+	fi
+'
+
+echo >.gitignore file3
+
+test_expect_success 'three-way not complaining on an untracked file' '
+
+	git reset --hard &&
+	rm -f file2 subdir/file2 file3 subdir/file3 &&
+	git checkout master &&
+	echo >file3 file three created in master, untracked &&
+	echo >subdir/file3 file three created in master, untracked &&
+
+	git read-tree -m -u --exclude-per-directory=.gitignore branch-point master side
+'
+
 test_done