$ git clone -n https://src.fedoraproject.org/rpms/rust-cmd_lib_macros.git /var/lib/mock/f45-build-40850-776/root/chroot_tmpdir/scmroot/rust-cmd_lib_macros
Cloning into '/var/lib/mock/f45-build-40850-776/root/chroot_tmpdir/scmroot/rust-cmd_lib_macros'...
$ git fetch origin 59ca218be9d9c6bb0f6ca10b92e41306e40eaa25:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cmd_lib_macros
 * [new ref]         59ca218be9d9c6bb0f6ca10b92e41306e40eaa25 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 59ca218 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild