$ git clone -n https://src.fedoraproject.org/rpms/gtksourceview4.git /var/lib/mock/f45-build-13188-447/root/chroot_tmpdir/scmroot/gtksourceview4
Cloning into '/var/lib/mock/f45-build-13188-447/root/chroot_tmpdir/scmroot/gtksourceview4'...
$ git fetch origin 4a472785fccd3b087e62586a2bcfd11f2a4303b2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gtksourceview4
 * [new ref]         4a472785fccd3b087e62586a2bcfd11f2a4303b2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4a47278 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild