$ git clone -n https://src.fedoraproject.org/rpms/rust-rand_os.git /var/lib/mock/f40-build-2657819-66917/root/chroot_tmpdir/scmroot/rust-rand_os
Cloning into '/var/lib/mock/f40-build-2657819-66917/root/chroot_tmpdir/scmroot/rust-rand_os'...
$ git fetch origin 03c011ce79b9555763cdddb80421cdc8afbc7466:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rand_os
 * [new ref]         03c011ce79b9555763cdddb80421cdc8afbc7466 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 03c011c Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild