$ git clone -n https://src.fedoraproject.org/rpms/firefox-pkcs11-loader.git /var/lib/mock/f39-build-1460169-33187/root/chroot_tmpdir/scmroot/firefox-pkcs11-loader
Cloning into '/var/lib/mock/f39-build-1460169-33187/root/chroot_tmpdir/scmroot/firefox-pkcs11-loader'...
$ git fetch origin eb130b6bd2a96a2872721be75255e34623bfde0a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/firefox-pkcs11-loader
 * [new ref]         eb130b6bd2a96a2872721be75255e34623bfde0a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at eb130b6 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild