git fast-import --export-marks=marks-cur --import-marks=marks-cur
'
+cat > expected << EOF
+blob
+mark :13
+data 5
+bump
+
+commit refs/heads/master
+mark :14
+author A U Thor <author@example.com> 1112912773 -0700
+committer C O Mitter <committer@example.com> 1112912773 -0700
+data 5
+bump
+from :12
+M 100644 :13 file
+
+EOF
+
+test_expect_success 'avoid uninteresting refs' '
+ > tmp-marks &&
+ git fast-export --import-marks=tmp-marks \
+ --export-marks=tmp-marks master > /dev/null &&
+ git tag v1.0 &&
+ git branch uninteresting &&
+ echo bump > file &&
+ git commit -a -m bump &&
+ git fast-export --import-marks=tmp-marks \
+ --export-marks=tmp-marks ^uninteresting ^v1.0 master > actual &&
+ test_cmp expected actual
+'
+
+cat > expected << EOF
+reset refs/heads/master
+from :14
+
+EOF
+
+test_expect_success 'refs are updated even if no commits need to be exported' '
+ > tmp-marks &&
+ git fast-export --import-marks=tmp-marks \
+ --export-marks=tmp-marks master > /dev/null &&
+ git fast-export --import-marks=tmp-marks \
+ --export-marks=tmp-marks master > actual &&
+ test_cmp expected actual
+'
+
test_done