$ git clone -n https://src.fedoraproject.org/rpms/rust-clang-sys.git /var/lib/mock/f40-build-2637181-66211/root/chroot_tmpdir/scmroot/rust-clang-sys
Cloning into '/var/lib/mock/f40-build-2637181-66211/root/chroot_tmpdir/scmroot/rust-clang-sys'...
$ git fetch origin 29766550e1b47b8c10ba8bdff6fad9c41ba91d87:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-clang-sys
 * [new ref]         29766550e1b47b8c10ba8bdff6fad9c41ba91d87 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2976655 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild