$ git clone -n https://src.fedoraproject.org/rpms/rust-sysinfo0.29.git /var/lib/mock/f45-build-45296-822/root/chroot_tmpdir/scmroot/rust-sysinfo0.29
Cloning into '/var/lib/mock/f45-build-45296-822/root/chroot_tmpdir/scmroot/rust-sysinfo0.29'...
$ git fetch origin 7ef8a2dd7e18ba0b3b3de0851379c0a114230008:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-sysinfo0.29
 * [new ref]         7ef8a2dd7e18ba0b3b3de0851379c0a114230008 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7ef8a2d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild