$ git clone -n https://src.fedoraproject.org/rpms/rust-serde_buf.git /var/lib/mock/f38-build-side-42-init-devel-1083459-29934/root/chroot_tmpdir/scmroot/rust-serde_buf
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1083459-29934/root/chroot_tmpdir/scmroot/rust-serde_buf'...
$ git fetch origin adcd455f6e26bb564289a9fbaebf26370b1bb65a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-serde_buf
 * [new ref]         adcd455f6e26bb564289a9fbaebf26370b1bb65a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at adcd455 Initial import (#2217023)