$ git clone -n https://src.fedoraproject.org/rpms/kalk.git /var/lib/mock/f40-build-2447190-61346/root/chroot_tmpdir/scmroot/kalk
Cloning into '/var/lib/mock/f40-build-2447190-61346/root/chroot_tmpdir/scmroot/kalk'...
$ git fetch origin ff422ab7244b6603d0378cb9b6401704fa5ae07c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kalk
 * [new ref]         ff422ab7244b6603d0378cb9b6401704fa5ae07c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ff422ab 24.01.95