$ git clone -n https://src.fedoraproject.org/rpms/rust-gtk3-macros.git /var/lib/mock/f39-build-1534552-36233/root/chroot_tmpdir/scmroot/rust-gtk3-macros
Cloning into '/var/lib/mock/f39-build-1534552-36233/root/chroot_tmpdir/scmroot/rust-gtk3-macros'...
$ git fetch origin 095aab5d2e92715ce2e0b325a730e46ece7b3d00:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gtk3-macros
 * [new ref]         095aab5d2e92715ce2e0b325a730e46ece7b3d00 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 095aab5 Update to version 0.18.0; Fixes RHBZ#2231719