$ git clone -n https://src.fedoraproject.org/rpms/salt.git /var/lib/mock/f42-build-side-1-3588388-46945/root/chroot_tmpdir/scmroot/salt
Cloning into '/var/lib/mock/f42-build-side-1-3588388-46945/root/chroot_tmpdir/scmroot/salt'...
$ git fetch origin 02055a6ab093711bc534bc95d8a8666f74bb983e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/salt
 * [new ref]         02055a6ab093711bc534bc95d8a8666f74bb983e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 02055a6 [skip changelog]