$ git clone -n https://src.fedoraproject.org/rpms/rust-serde_repr.git /var/lib/mock/f40-build-2093533-50327/root/chroot_tmpdir/scmroot/rust-serde_repr
Cloning into '/var/lib/mock/f40-build-2093533-50327/root/chroot_tmpdir/scmroot/rust-serde_repr'...
$ git fetch origin 106a5240a5cc9cafb14afca635c8260a5b035171:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-serde_repr
 * [new ref]         106a5240a5cc9cafb14afca635c8260a5b035171 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 106a524 Update to version 0.1.17; Fixes RHBZ#2246890