$ git clone -n https://src.fedoraproject.org/rpms/rust-gdk-pixbuf-sys.git /var/lib/mock/f42-build-side-1-3573168-46766/root/chroot_tmpdir/scmroot/rust-gdk-pixbuf-sys
Cloning into '/var/lib/mock/f42-build-side-1-3573168-46766/root/chroot_tmpdir/scmroot/rust-gdk-pixbuf-sys'...
$ git fetch origin 4118a39332d1321e9a30ed1df351c81dd8d405bb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gdk-pixbuf-sys
 * [new ref]         4118a39332d1321e9a30ed1df351c81dd8d405bb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4118a39 Update to version 0.20.10; Fixes RHBZ#2365828