$ git clone -n https://src.fedoraproject.org/rpms/rust-rustc_version0.3.git /var/lib/mock/f39-build-1522594-35938/root/chroot_tmpdir/scmroot/rust-rustc_version0.3
Cloning into '/var/lib/mock/f39-build-1522594-35938/root/chroot_tmpdir/scmroot/rust-rustc_version0.3'...
$ git fetch origin 4dd41d972d79917443654085c4408e7b49cfb475:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rustc_version0.3
 * [new ref]         4dd41d972d79917443654085c4408e7b49cfb475 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4dd41d9 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild