$ git clone -n https://src.fedoraproject.org/rpms/R-pkgbuild.git /var/lib/mock/f39-build-1584468-38137/root/chroot_tmpdir/scmroot/R-pkgbuild
Cloning into '/var/lib/mock/f39-build-1584468-38137/root/chroot_tmpdir/scmroot/R-pkgbuild'...
$ git fetch origin 0c55846f0df8b48417145bf0e3709fc10b03aa6b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-pkgbuild
 * [new ref]         0c55846f0df8b48417145bf0e3709fc10b03aa6b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0c55846 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild