$ git clone -n https://src.fedoraproject.org/rpms/rust-futures-macro.git /var/lib/mock/f39-build-2160747-50946/root/chroot_tmpdir/scmroot/rust-futures-macro
Cloning into '/var/lib/mock/f39-build-2160747-50946/root/chroot_tmpdir/scmroot/rust-futures-macro'...
$ git fetch origin e50d52933077733e816d86b8425dea87fb06174b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-futures-macro
 * [new ref]         e50d52933077733e816d86b8425dea87fb06174b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e50d529 Update to version 0.3.30; Fixes RHBZ#2246399