$ git clone -n https://src.fedoraproject.org/rpms/rust-libblkid-rs-sys.git /var/lib/mock/f39-build-1691988-41139/root/chroot_tmpdir/scmroot/rust-libblkid-rs-sys
Cloning into '/var/lib/mock/f39-build-1691988-41139/root/chroot_tmpdir/scmroot/rust-libblkid-rs-sys'...
$ git fetch origin bfc25e0bfdb124afc2fd720fc61004a17dfbfc16:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-libblkid-rs-sys
 * [new ref]         bfc25e0bfdb124afc2fd720fc61004a17dfbfc16 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bfc25e0 Rebuild for new side-tag build