$ git clone -n https://src.fedoraproject.org/rpms/rust-manyhow-macros.git /var/lib/mock/f45-build-43122-800/root/chroot_tmpdir/scmroot/rust-manyhow-macros
Cloning into '/var/lib/mock/f45-build-43122-800/root/chroot_tmpdir/scmroot/rust-manyhow-macros'...
$ git fetch origin b01bc8071b99f37ff1e04d9a81b01107ab66d4d7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-manyhow-macros
 * [new ref]         b01bc8071b99f37ff1e04d9a81b01107ab66d4d7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b01bc80 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild