$ git clone -n https://src.fedoraproject.org/rpms/mingw-glib2.git /var/lib/mock/f40-build-2255850-54266/root/chroot_tmpdir/scmroot/mingw-glib2
Cloning into '/var/lib/mock/f40-build-2255850-54266/root/chroot_tmpdir/scmroot/mingw-glib2'...
$ git fetch origin a5ef45687ab3370aa330cc86541684e91f893495:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mingw-glib2
 * [new ref]         a5ef45687ab3370aa330cc86541684e91f893495 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a5ef456 Fix files