$ git clone -n https://src.fedoraproject.org/rpms/rust-gdk-pixbuf.git /var/lib/mock/f42-build-side-1-3571486-46755/root/chroot_tmpdir/scmroot/rust-gdk-pixbuf
Cloning into '/var/lib/mock/f42-build-side-1-3571486-46755/root/chroot_tmpdir/scmroot/rust-gdk-pixbuf'...
$ git fetch origin dcbc1f8cf94ddfc0055c8d374631dc25fd0e369a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gdk-pixbuf
 * [new ref]         dcbc1f8cf94ddfc0055c8d374631dc25fd0e369a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dcbc1f8 Update to version 0.20.10; Fixes RHBZ#2365892