$ git clone -n https://src.fedoraproject.org/rpms/crash-gcore-command.git /var/lib/mock/f39-build-2469256-61444/root/chroot_tmpdir/scmroot/crash-gcore-command
Cloning into '/var/lib/mock/f39-build-2469256-61444/root/chroot_tmpdir/scmroot/crash-gcore-command'...
$ git fetch origin 5a2e9731172a55cedccb3d21cda67d89c1be477e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/crash-gcore-command
 * [new ref]         5a2e9731172a55cedccb3d21cda67d89c1be477e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5a2e973 Version 1.6.4-3