$ git clone -n https://src.fedoraproject.org/rpms/gnome-extensions-app.git /var/lib/mock/f40-build-797994-141646/root/chroot_tmpdir/scmroot/gnome-extensions-app
Cloning into '/var/lib/mock/f40-build-797994-141646/root/chroot_tmpdir/scmroot/gnome-extensions-app'...
$ git fetch origin a361891c74887b65715674f3649fc959c8690f00:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-extensions-app
 * [new ref]         a361891c74887b65715674f3649fc959c8690f00 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a361891 Update to 46.0