$ git clone -n https://src.fedoraproject.org/rpms/rust-manyhow.git /var/lib/mock/f45-build-43105-800/root/chroot_tmpdir/scmroot/rust-manyhow
Cloning into '/var/lib/mock/f45-build-43105-800/root/chroot_tmpdir/scmroot/rust-manyhow'...
$ git fetch origin 80517f6067b96d4afdc503c71ebf88e2cad4127a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-manyhow
 * [new ref]         80517f6067b96d4afdc503c71ebf88e2cad4127a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 80517f6 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild