$ git clone -n https://src.fedoraproject.org/rpms/golang-github-apparentlymart-textseg.git /var/lib/mock/f38-build-side-42-init-devel-615475-26317/root/chroot_tmpdir/scmroot/golang-github-apparentlymart-textseg
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-615475-26317/root/chroot_tmpdir/scmroot/golang-github-apparentlymart-textseg'...
$ git fetch origin ff5bc5928f8710b027cdded2583f947237f20a9e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-apparentlymart-textseg
 * [new ref]         ff5bc5928f8710b027cdded2583f947237f20a9e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ff5bc59 Added the README