$ git clone -n https://src.fedoraproject.org/rpms/rubygem-curb.git /var/lib/mock/f40-build-777903-129631/root/chroot_tmpdir/scmroot/rubygem-curb
Cloning into '/var/lib/mock/f40-build-777903-129631/root/chroot_tmpdir/scmroot/rubygem-curb'...
$ git fetch origin 28571a8bd3c8c4da6c5b7baa50479f73ef762abe:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-curb
 * [new ref]         28571a8bd3c8c4da6c5b7baa50479f73ef762abe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 28571a8 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild