$ git clone -n https://src.fedoraproject.org/rpms/rust-libblkid-rs.git /var/lib/mock/f45-build-42903-797/root/chroot_tmpdir/scmroot/rust-libblkid-rs
Cloning into '/var/lib/mock/f45-build-42903-797/root/chroot_tmpdir/scmroot/rust-libblkid-rs'...
$ git fetch origin 6d9091eea6aaac68d8e88d8cc75bbcd22074e3fd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-libblkid-rs
 * [new ref]         6d9091eea6aaac68d8e88d8cc75bbcd22074e3fd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6d9091e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild