$ git clone -n https://src.fedoraproject.org/rpms/rust-loopdev.git /var/lib/mock/f40-build-2653037-66898/root/chroot_tmpdir/scmroot/rust-loopdev
Cloning into '/var/lib/mock/f40-build-2653037-66898/root/chroot_tmpdir/scmroot/rust-loopdev'...
$ git fetch origin 4611fb23eb83a6b886f5d8848f81e9953182a0e4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-loopdev
 * [new ref]         4611fb23eb83a6b886f5d8848f81e9953182a0e4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4611fb2 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild