Add omarchy-toggle-ip-mode (DHCP/static IPv4 switcher)

[ElvarThorS]

Summary

• Add bin/omarchy-toggle-ip-mode.
• It switches a selected systemd-networkd interface between DHCP and static IPv4.
• It works both interactively and with flags.

What it does

• Lists managed interfaces and shows each with subnet + usable IP range.
• Preselects the default-route interface for quick use.
• Default toggle behavior:
  • if static override exists -> remove it and return to DHCP
  • otherwise -> ask for a static IP and create the override
• Supports non-interactive usage:
  • --iface <iface>
  • --dhcp
  • --static <ip>
• Remembers the last static IP per interface.

Design choices

• Writes only a drop-in override at /etc/systemd/network/<profile>.network.d/90-omarchy-ip-mode.conf.
• Does not edit base .network files.
• Resolves the profile in this order:
  1. networkctl reported file
  2. common Omarchy profile names
  3. scan of standard networkd profile paths
• Uses gum when available, with shell prompt fallback.
• Restarts systemd-networkd and systemd-resolved after changes.

Safety checks and failure handling

• Refuses to write if no valid .network profile is found.
• Validates IPv4 format, subnet match, usable host range, and rejects gateway IP as static.
• Handles systems with no default route by choosing a fallback managed interface.
• --dhcp is idempotent (prints a no-op message if already DHCP).
• Validates CLI flags and prints clear errors for invalid combinations/values.

Scope

• Adds one tracked file: bin/omarchy-toggle-ip-mode.
• No migrations.
• No edits to existing scripts or base network profile files.

Runtime artifacts (created on user systems)

• State file: ~/.local/state/omarchy/ip-mode/last-static-<iface>
• Networkd override: /etc/systemd/network/<profile>.network.d/90-omarchy-ip-mode.conf (created/updated in static mode, removed in DHCP mode)

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[dhh]

Interesting idea, but not something that's common enough to warrant over 500 lines of code to the project. Thanks for the suggestion, though!