$ git clone -n https://src.fedoraproject.org/rpms/rust-gtk0.15.git /var/lib/mock/f39-build-1527215-36136/root/chroot_tmpdir/scmroot/rust-gtk0.15
Cloning into '/var/lib/mock/f39-build-1527215-36136/root/chroot_tmpdir/scmroot/rust-gtk0.15'...
$ git fetch origin b6086a0f986261a85f273b0da412190afadce859:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gtk0.15
 * [new ref]         b6086a0f986261a85f273b0da412190afadce859 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b6086a0 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild