$ git clone -n https://src.fedoraproject.org/rpms/golang-github-pkg-errors.git /var/lib/mock/f39-build-1629314-39542/root/chroot_tmpdir/scmroot/golang-github-pkg-errors
Cloning into '/var/lib/mock/f39-build-1629314-39542/root/chroot_tmpdir/scmroot/golang-github-pkg-errors'...
$ git fetch origin 5fe6571b8435363e87304ae7c6bff35b562274d0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-pkg-errors
 * [new ref]         5fe6571b8435363e87304ae7c6bff35b562274d0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5fe6571 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild