$ git clone -n https://src.fedoraproject.org/rpms/fstransform.git /var/lib/mock/f45-build-9307-401/root/chroot_tmpdir/scmroot/fstransform
Cloning into '/var/lib/mock/f45-build-9307-401/root/chroot_tmpdir/scmroot/fstransform'...
$ git fetch origin 3ca18c756f74d4674a2c79e8a39162e6e88531e5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fstransform
 * [new ref]         3ca18c756f74d4674a2c79e8a39162e6e88531e5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3ca18c7 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild