$ git clone -n https://src.fedoraproject.org/rpms/rust-data-url.git /var/lib/mock/f39-build-1516945-35667/root/chroot_tmpdir/scmroot/rust-data-url
Cloning into '/var/lib/mock/f39-build-1516945-35667/root/chroot_tmpdir/scmroot/rust-data-url'...
$ git fetch origin 0894741b3a7dda81c1100810f54587132ca1e299:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-data-url
 * [new ref]         0894741b3a7dda81c1100810f54587132ca1e299 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0894741 Update to version 0.3.0; Fixes RHBZ#2212338