$ git clone -n https://src.fedoraproject.org/rpms/anaconda.git /var/lib/mock/f42-build-3459048-45513/root/chroot_tmpdir/scmroot/anaconda
Cloning into '/var/lib/mock/f42-build-3459048-45513/root/chroot_tmpdir/scmroot/anaconda'...
$ git fetch origin 4028bf7c0c2fece25ce7708b19dfe1bba9ccf390:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/anaconda
 * [new ref]         4028bf7c0c2fece25ce7708b19dfe1bba9ccf390 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4028bf7 Update to 43.12 upstream release