$ git clone -n https://src.fedoraproject.org/rpms/rust-gdk-sys0.17.git /var/lib/mock/f38-build-side-43-rust-devel-1421701-31465/root/chroot_tmpdir/scmroot/rust-gdk-sys0.17
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1421701-31465/root/chroot_tmpdir/scmroot/rust-gdk-sys0.17'...
$ git fetch origin adcae1aed3a1f6e7368c7aec289335d5157c7c58:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gdk-sys0.17
 * [new ref]         adcae1aed3a1f6e7368c7aec289335d5157c7c58 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at adcae1a Initial import (gdk-sys 0.17 compat package)