$ git clone -n https://src.fedoraproject.org/rpms/rust-cache-padded.git /var/lib/mock/f41-build-1099154-20020/root/chroot_tmpdir/scmroot/rust-cache-padded
Cloning into '/var/lib/mock/f41-build-1099154-20020/root/chroot_tmpdir/scmroot/rust-cache-padded'...
$ git fetch origin ad973895bf597cb56efb09b252bd5f52428570d4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cache-padded
 * [new ref]         ad973895bf597cb56efb09b252bd5f52428570d4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ad97389 Add riscv64 support