$ git clone -n https://src.fedoraproject.org/rpms/cocoalib.git /var/lib/mock/f45-build-5163-337/root/chroot_tmpdir/scmroot/cocoalib
Cloning into '/var/lib/mock/f45-build-5163-337/root/chroot_tmpdir/scmroot/cocoalib'...
$ git fetch origin 77f320baa34b3e66fe4068e96d2689534f121304:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cocoalib
 * [new ref]         77f320baa34b3e66fe4068e96d2689534f121304 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 77f320b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild