$ git clone -n https://src.fedoraproject.org/rpms/rust-gdk-pixbuf.git /var/lib/mock/f39-build-2272529-54915/root/chroot_tmpdir/scmroot/rust-gdk-pixbuf
Cloning into '/var/lib/mock/f39-build-2272529-54915/root/chroot_tmpdir/scmroot/rust-gdk-pixbuf'...
$ git fetch origin 86dc32e9b11348cb71abb5715af015cc68d42aa5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gdk-pixbuf
 * [new ref]         86dc32e9b11348cb71abb5715af015cc68d42aa5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 86dc32e Update to version 0.18.5; Fixes RHBZ#2247773