$ git clone -n https://src.fedoraproject.org/rpms/perl-MARC-Record.git /var/lib/mock/f40-build-2243622-53698/root/chroot_tmpdir/scmroot/perl-MARC-Record
Cloning into '/var/lib/mock/f40-build-2243622-53698/root/chroot_tmpdir/scmroot/perl-MARC-Record'...
$ git fetch origin 172ba440e02c9e1b16ec141167f9e2cddfa73092:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-MARC-Record
 * [new ref]         172ba440e02c9e1b16ec141167f9e2cddfa73092 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 172ba44 Package tests