forked from clan/clan-core
136 lines
4.8 KiB
Nix
136 lines
4.8 KiB
Nix
{
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lib,
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pkgs,
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config,
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...
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}:
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{
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# interface
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options.clan.core.state = lib.mkOption {
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description = ''
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Define state directories to backup and restore
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'';
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default = { };
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type = lib.types.attrsOf (
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lib.types.submodule (
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{ name, config, ... }:
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{
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options = {
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name = lib.mkOption {
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type = lib.types.strMatching "^[a-zA-Z0-9_-]+$";
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default = name;
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description = ''
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Name of the state
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'';
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};
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folders = lib.mkOption {
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type = lib.types.listOf lib.types.str;
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description = ''
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Folder where state resides in
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'';
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};
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preBackupScript = lib.mkOption {
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type = lib.types.nullOr lib.types.lines;
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default = null;
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description = ''
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script to run before backing up the state dir
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This is for example useful for services that require an export of their state
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e.g. a database dump
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'';
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};
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preBackupCommand = lib.mkOption {
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type = lib.types.nullOr lib.types.str;
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default = if config.preBackupScript == null then null else "pre-backup-${name}";
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readOnly = true;
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description = ''
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Use this command in backup providers. It contains the content of preBackupScript.
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'';
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};
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# TODO: implement this
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#stopOnRestore = lib.mkOption {
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# type = lib.types.listOf lib.types.str;
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# default = [];
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# description = ''
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# List of services to stop before restoring the state dir from a backup
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# Utilize this to stop services which currently access these folders or or other services affected by the restore
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# '';
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#};
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preRestoreScript = lib.mkOption {
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type = lib.types.nullOr lib.types.lines;
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default = null;
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description = ''
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script to run before restoring the state dir from a backup
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Utilize this to stop services which currently access these folders
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'';
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};
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preRestoreCommand = lib.mkOption {
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type = lib.types.nullOr lib.types.str;
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default = if config.preRestoreScript == null then null else "pre-restore-${name}";
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readOnly = true;
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description = ''
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This command can be called to restore the state dir from a backup.
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It contains the content of preRestoreScript.
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'';
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};
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postRestoreScript = lib.mkOption {
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type = lib.types.nullOr lib.types.lines;
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default = null;
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description = ''
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script to restore the service after the state dir was restored from a backup
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Utilize this to start services which were previously stopped
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'';
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};
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postRestoreCommand = lib.mkOption {
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type = lib.types.nullOr lib.types.str;
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default = if config.postRestoreScript == null then null else "post-restore-${name}";
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readOnly = true;
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description = ''
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This command is called after a restore of the state dir from a backup.
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It contains the content of postRestoreScript.
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'';
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};
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};
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}
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)
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);
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};
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# defaults
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config.clan.core.state.HOME.folders = [ "/home" ];
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config.environment.systemPackages = lib.optional (config.clan.core.state != { }) (
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pkgs.runCommand "state-commands" { } ''
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${builtins.concatStringsSep "\n" (
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builtins.map (state: ''
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writeShellScript() {
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local name=$1
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local content=$2
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printf "#!${pkgs.runtimeShell}\nset -eu -o pipefail\n%s" "$content" > $out/bin/$name
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}
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mkdir -p $out/bin/
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${lib.optionalString (state.preBackupCommand != null) ''
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writeShellScript ${lib.escapeShellArg state.preBackupCommand} ${lib.escapeShellArg state.preBackupScript}
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''}
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${lib.optionalString (state.preRestoreCommand != null) ''
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writeShellScript ${lib.escapeShellArg state.preRestoreCommand} ${lib.escapeShellArg state.preRestoreScript}
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''}
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${lib.optionalString (state.postRestoreCommand != null) ''
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writeShellScript ${lib.escapeShellArg state.postRestoreCommand} ${lib.escapeShellArg state.postRestoreScript}
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''}
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find $out/bin/ -type f -print0 | xargs --no-run-if-empty -0 chmod 755
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'') (builtins.attrValues config.clan.core.state)
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)}
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''
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);
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}
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