$ git clone -n https://github.com/fedora-riscv/rubygem-childprocess.git /var/lib/mock/f38-build-side-42-init-devel-997008-29137/root/chroot_tmpdir/scmroot/rubygem-childprocess
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-997008-29137/root/chroot_tmpdir/scmroot/rubygem-childprocess'...
$ git fetch origin 3c237d66d99bfeaeed88edfa956c55f742654243:KOJI_FETCH_HEAD
From https://github.com/fedora-riscv/rubygem-childprocess
 * [new ref]         3c237d66d99bfeaeed88edfa956c55f742654243 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3c237d6 close check