$ git clone -n https://src.fedoraproject.org/rpms/rust-rand_isaac.git /var/lib/mock/f40-build-2327107-58850/root/chroot_tmpdir/scmroot/rust-rand_isaac
Cloning into '/var/lib/mock/f40-build-2327107-58850/root/chroot_tmpdir/scmroot/rust-rand_isaac'...
$ git fetch origin 400c6b140dcca926f614bad97a57936eb2f1e621:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rand_isaac
 * [new ref]         400c6b140dcca926f614bad97a57936eb2f1e621 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 400c6b1 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild