Pathfinder
8ca045de4a
virt-manager on niri/Noctalia failed with 'authentication unavailable: no polkit agent available to authenticate action org.libvirt.unix.manage' - bare compositors ship no polkit agent, unlike GNOME/KDE. Two fixes: - install_session_prereqs installs polkit-gnome and wires its agent .desktop into /etc/xdg/autostart (paths overridable for testing). - niri module optionally installs the qemu/libvirt stack, enables libvirtd, and adds the user to the libvirt group: members manage qemu:///system with no polkit prompt at all (the real fix; applies after re-login).
106 lines
3.8 KiB
Bash
106 lines
3.8 KiB
Bash
# shellcheck shell=bash
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#------------------------------------------
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# lib/session.sh — display manager and graphical session wiring
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#
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# DM policy:
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# * A DE module leaves its native DM alone (GNOME→gdm, Plasma→sddm, XFCE→sddm).
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# * A TWM module enforces SDDM, because SDDM is the only DM that presents both
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# Wayland compositors and X11 sessions in one menu. One greeter, no surprises.
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#------------------------------------------
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if [[ -n "${_SB_SESSION_LOADED:-}" ]]; then
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return 0
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fi
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_SB_SESSION_LOADED=1
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# Name of the active display manager ("sddm", "gdm", "lightdm"), or "" if none.
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detect_display_manager() {
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local link=/etc/systemd/system/display-manager.service
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if [[ -L "$link" ]]; then
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basename "$(readlink "$link")" | sed 's/\.service$//'
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else
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echo ""
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fi
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}
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enable_graphical_target() {
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sudo systemctl set-default graphical.target
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}
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# Make $1 the display manager, disabling whatever is active now.
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switch_display_manager() {
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local target="$1"
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local current
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current=$(detect_display_manager)
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if [[ "$current" == "$target" ]]; then
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ok "Display manager already $target."
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else
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if [[ -n "$current" ]]; then
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info "Disabling current display manager: $current"
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# disable may fail if the unit vanished; that is not fatal
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sudo systemctl disable "$current" 2>/dev/null || true
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fi
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info "Enabling display manager: $target"
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sudo systemctl enable "$target"
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fi
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enable_graphical_target
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}
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# Register a Wayland session so the DM can list it.
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# $1 = identifier, $2 = display name, $3 = command
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write_wayland_session() {
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local id="$1" name="$2" exec_cmd="$3"
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local file="/usr/share/wayland-sessions/${id}.desktop"
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if [[ -f "$file" ]]; then
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ok "Wayland session already registered: $id"
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return 0
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fi
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info "Registering Wayland session: $id"
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sudo mkdir -p "$(dirname "$file")"
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printf '[Desktop Entry]\nName=%s\nComment=%s\nExec=%s\nType=Application\nDesktopNames=%s\n' \
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"$name" "$name session" "$exec_cmd" "$id" | sudo tee "$file" >/dev/null
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sudo chmod 644 "$file"
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}
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# Register an X11 session so the DM can list it.
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write_x11_session() {
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local id="$1" name="$2" exec_cmd="$3"
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local file="/usr/share/xsessions/${id}.desktop"
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if [[ -f "$file" ]]; then
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ok "X11 session already registered: $id"
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return 0
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fi
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info "Registering X11 session: $id"
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# A bare Fedora has no X session yet, so the directory may not exist.
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sudo mkdir -p "$(dirname "$file")"
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printf '[Desktop Entry]\nName=%s\nComment=%s\nExec=%s\nType=Application\n' \
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"$name" "$name session" "$exec_cmd" | sudo tee "$file" >/dev/null
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sudo chmod 644 "$file"
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}
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# Common login-time plumbing every Wayland compositor wants on a bare install.
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install_session_prereqs() {
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install_packages \
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xdg-desktop-portal \
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polkit \
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polkit-gnome \
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pipewire \
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pipewire-pulseaudio \
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wireplumber
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# A bare compositor (niri, MangoWC, Hyprland) has NO polkit agent: without
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# one, anything needing privilege elevation (virt-manager's libvirt access,
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# disks, network settings) fails with "no polkit agent available to
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# authenticate". Autostart it for every graphical session via the XDG
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# autostart dir the session runs.
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local autostart="${XDG_AUTOSTART_DIR:-/etc/xdg/autostart}"
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local desktop_src="${POLKIT_AGENT_DESKTOP:-/usr/share/applications/polkit-gnome-authentication-agent-1.desktop}"
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if [[ -f "$desktop_src" ]] && [[ ! -e "$autostart/$(basename "$desktop_src")" ]]; then
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info "Enabling polkit agent for compositor sessions..."
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sudo mkdir -p "$autostart"
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sudo ln -sf "$desktop_src" "$autostart/$(basename "$desktop_src")"
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fi
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}
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