$ git clone -n https://src.fedoraproject.org/rpms/rubygem-test_declarative.git /var/lib/mock/f39-build-1464908-33540/root/chroot_tmpdir/scmroot/rubygem-test_declarative
Cloning into '/var/lib/mock/f39-build-1464908-33540/root/chroot_tmpdir/scmroot/rubygem-test_declarative'...
$ git fetch origin 816dc2e5f0e2852e68d566014a77e89b3048b1a5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-test_declarative
 * [new ref]         816dc2e5f0e2852e68d566014a77e89b3048b1a5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 816dc2e Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild