$ git clone -n https://src.fedoraproject.org/rpms/rust-gdk-pixbuf-sys0.21.git /var/lib/mock/f45-build-41831-786/root/chroot_tmpdir/scmroot/rust-gdk-pixbuf-sys0.21
Cloning into '/var/lib/mock/f45-build-41831-786/root/chroot_tmpdir/scmroot/rust-gdk-pixbuf-sys0.21'...
$ git fetch origin 43912ad7e22225e0c993107e179091f7a33b300d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gdk-pixbuf-sys0.21
 * [new ref]         43912ad7e22225e0c993107e179091f7a33b300d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 43912ad Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild