$ git clone -n https://src.fedoraproject.org/rpms/rust-time-macros.git /var/lib/mock/f39-build-1489196-34501/root/chroot_tmpdir/scmroot/rust-time-macros
Cloning into '/var/lib/mock/f39-build-1489196-34501/root/chroot_tmpdir/scmroot/rust-time-macros'...
$ git fetch origin 0d59498d7a2dcfaffce0cb4fe8d8f577f78d7f99:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-time-macros
 * [new ref]         0d59498d7a2dcfaffce0cb4fe8d8f577f78d7f99 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0d59498 Update to version 0.2.15; Fixes RHBZ#2240434