$ git clone -n https://src.fedoraproject.org/rpms/rubygem-posix-spawn.git /var/lib/mock/f40-build-1780580-24818/root/chroot_tmpdir/scmroot/rubygem-posix-spawn
Cloning into '/var/lib/mock/f40-build-1780580-24818/root/chroot_tmpdir/scmroot/rubygem-posix-spawn'...
$ git fetch origin 5265f29a5346674ee06593dbdc15c0f8f32c0665:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-posix-spawn
 * [new ref]         5265f29a5346674ee06593dbdc15c0f8f32c0665 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5265f29 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild