$ git clone -n https://src.fedoraproject.org/rpms/mate-panel.git /var/lib/mock/f39-build-1462158-33308/root/chroot_tmpdir/scmroot/mate-panel
Cloning into '/var/lib/mock/f39-build-1462158-33308/root/chroot_tmpdir/scmroot/mate-panel'...
$ git fetch origin 2f849a6ec19434835cac50e1e1b6fed524c74b90:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mate-panel
 * [new ref]         2f849a6ec19434835cac50e1e1b6fed524c74b90 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2f849a6 fix crash when removing notification-area applet from panel