$ git clone -n https://src.fedoraproject.org/rpms/yosyshq-abc.git /var/lib/mock/f42-build-side-1-3503836-45982/root/chroot_tmpdir/scmroot/yosyshq-abc
Cloning into '/var/lib/mock/f42-build-side-1-3503836-45982/root/chroot_tmpdir/scmroot/yosyshq-abc'...
$ git fetch origin 912f6e989e431a4a4d999e3794504f00d3bc8f46:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/yosyshq-abc
 * [new ref]         912f6e989e431a4a4d999e3794504f00d3bc8f46 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 912f6e9 update to 0.52 snapshot