$ git clone -n https://src.fedoraproject.org/rpms/xdg-desktop-portal-gnome.git /var/lib/mock/f39-build-1635801-39877/root/chroot_tmpdir/scmroot/xdg-desktop-portal-gnome
Cloning into '/var/lib/mock/f39-build-1635801-39877/root/chroot_tmpdir/scmroot/xdg-desktop-portal-gnome'...
$ git fetch origin b3ceb34540f87fd7644a9297597e344e6dbfbb86:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xdg-desktop-portal-gnome
 * [new ref]         b3ceb34540f87fd7644a9297597e344e6dbfbb86 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b3ceb34 Update to 45.0