$ git clone -n https://src.fedoraproject.org/rpms/rust-gdk-pixbuf.git /var/lib/mock/f38-build-side-43-rust-devel-1400573-31152/root/chroot_tmpdir/scmroot/rust-gdk-pixbuf
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1400573-31152/root/chroot_tmpdir/scmroot/rust-gdk-pixbuf'...
$ git fetch origin 6fd2acae1830cf107d61efabd41ab0773ae053d5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gdk-pixbuf
 * [new ref]         6fd2acae1830cf107d61efabd41ab0773ae053d5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6fd2aca Update to version 0.18.0; Fixes RHBZ#2224904