$ git clone -n https://src.fedoraproject.org/rpms/rust-zvariant.git /var/lib/mock/f38-build-side-43-rust-devel-1397590-31052/root/chroot_tmpdir/scmroot/rust-zvariant
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1397590-31052/root/chroot_tmpdir/scmroot/rust-zvariant'...
$ git fetch origin 9577ef218c86af3acd24778a125c8693a9a5ebee:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-zvariant
 * [new ref]         9577ef218c86af3acd24778a125c8693a9a5ebee -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9577ef2 Update to version 3.15.0; Fixes RHBZ#2218341