Christina O'Donnell ce76393bb7 home-manager: add support for custom backup command (#6424) (#7153) ...

This adds a new backupCommand option to allow users to specify a
custom command to run on existing files during activation, as an
alternative to the existing backupFileExtension mechanism.

Adds backupCommand option to NixOS and nix-darwin modules.

Exports HOME_MANAGER_BACKUP_COMMAND environment variable when set.

Updates file activation logic to use the custom backup command if
provided, falling back to the existing backup extension logic.

Updates collision checking and user-facing instructions to
mention the new option.

This enables advanced backup workflows, such as moving files to
trash or archiving with custom tools, before managing them with
Home Manager.

2025-10-30 12:26:13 -05:00

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