$ git clone -n https://src.fedoraproject.org/rpms/mkbootdisk.git /var/lib/mock/f40-build-764239-122871/root/chroot_tmpdir/scmroot/mkbootdisk
Cloning into '/var/lib/mock/f40-build-764239-122871/root/chroot_tmpdir/scmroot/mkbootdisk'...
$ git fetch origin 543aadff98d6a959289d64e4be6ce541dbb54ce8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mkbootdisk
 * [new ref]         543aadff98d6a959289d64e4be6ce541dbb54ce8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 543aadf Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild