$ git clone -n https://src.fedoraproject.org/rpms/rubygem-crass.git /var/lib/mock/f39-build-1458146-33040/root/chroot_tmpdir/scmroot/rubygem-crass
Cloning into '/var/lib/mock/f39-build-1458146-33040/root/chroot_tmpdir/scmroot/rubygem-crass'...
$ git fetch origin b1a23ef3ad1275383ad9e2713a587ef6c8461af5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-crass
 * [new ref]         b1a23ef3ad1275383ad9e2713a587ef6c8461af5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b1a23ef Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild