$ git clone -n https://src.fedoraproject.org/rpms/diskimage-builder.git /var/lib/mock/f39-build-1679859-41015/root/chroot_tmpdir/scmroot/diskimage-builder
Cloning into '/var/lib/mock/f39-build-1679859-41015/root/chroot_tmpdir/scmroot/diskimage-builder'...
$ git fetch origin fc253f89ca85765691e4831ccd0a001146b19218:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/diskimage-builder
 * [new ref]         fc253f89ca85765691e4831ccd0a001146b19218 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fc253f8 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild