$ git clone -n https://src.fedoraproject.org/rpms/rust-spin0.10.git /var/lib/mock/f45-build-45116-821/root/chroot_tmpdir/scmroot/rust-spin0.10
Cloning into '/var/lib/mock/f45-build-45116-821/root/chroot_tmpdir/scmroot/rust-spin0.10'...
$ git fetch origin 390e53c90726d5f21fa3cb73094a400ff6704527:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-spin0.10
 * [new ref]         390e53c90726d5f21fa3cb73094a400ff6704527 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 390e53c Initial import (spin v0.10 compat package)