$ git clone -n https://src.fedoraproject.org/rpms/pacman.git /var/lib/mock/f39-build-1535693-36247/root/chroot_tmpdir/scmroot/pacman
Cloning into '/var/lib/mock/f39-build-1535693-36247/root/chroot_tmpdir/scmroot/pacman'...
$ git fetch origin 2d2383e23773c1ada2d6f8c26d41a4e3812b8b14:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pacman
 * [new ref]         2d2383e23773c1ada2d6f8c26d41a4e3812b8b14 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2d2383e Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild