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-rwxr-xr-xpkgs/apply-config/apply-config134
-rw-r--r--pkgs/apply-config/default.nix14
-rw-r--r--pkgs/overlay.nix2
3 files changed, 150 insertions, 0 deletions
diff --git a/pkgs/apply-config/apply-config b/pkgs/apply-config/apply-config
new file mode 100755
index 0000000..0ab7ff0
--- /dev/null
+++ b/pkgs/apply-config/apply-config
@@ -0,0 +1,134 @@
+#!/usr/bin/env gosh
+
+(use gauche.parseopt)
+(use gauche.process)
+(use util.match)
+
+(define action #f)
+(define attribute
+ (string-append "nixosConfigurations." (sys-gethostname)))
+(define keep #f)
+(define specialisation #f)
+(define verbose #f)
+(define extra-nix-args '())
+(define config-path ".")
+
+
+(define (usage progname)
+ (display
+#"~|progname|: Activate a nixos configuration.
+
+Usage: ~|progname| [OPTIONS] [PATH] ACTION
+
+where ACTION is one of the actions which can be passed to switch-to-configuration
+(i.e. dry-activate, switch, test, or boot).
+
+Options:
+ -A --attr Attribute which evaluates to a (built) configuration.
+ Defaults to nixosConfigurations.<hostname>
+ -k --keep Add a garbage collection root for the built configuration.
+ -s --specialisation Specialisation to apply.
+ -v --verbose Display commands before they are run.
+ -h --help Print this help message.
+"))
+
+
+(define (run-command cmd)
+ (when verbose
+ (display cmd (standard-error-port)))
+ (do-process! cmd))
+
+(define (log-msg msg)
+ (display msg (standard-error-port)))
+
+(define (log-verbose msg)
+ (when verbose
+ (log-msg msg)))
+
+(define (main args)
+ (let-args
+ (cdr args)
+ ((o-verbose "v|verbose")
+ ; these are taken from nix-build
+ (o-attribute "A|attr=s")
+ (o-keep "k|keep")
+ (o-specialisation "s|specialisation=s")
+ (help "h|help" =>
+ (cut (begin (usage (car args)) (exit 0))))
+ (else (opt . _)
+ (print "unknown option: " opt "\n") (usage (car args)) (exit 1))
+ . restargs)
+
+ (when o-attribute
+ (set! attribute o-attribute))
+ (set! keep o-keep)
+ (set! specialisation o-specialisation)
+ (set! verbose o-verbose)
+
+ (match restargs
+ [((or "dry-activate" "switch" "test" "boot"))
+ (set! action (string->symbol (car restargs)))]
+ [(path (or "dry-activate" "switch" "test" "boot"))
+ (set! action (string->symbol (cadr restargs)))
+ (set! config-path path)]
+ [_ (begin (usage (car args)) (exit 1))])
+
+ (when (and specialisation (not (or (equal? action "test") (equal? action "switch"))))
+ (log-msg "Error: --specialisation can only be used with `test' or `switch'")
+ (exit 1))
+
+ (log-verbose (format "action: ~a" action))
+
+
+ (let ([built-config (build-config)])
+ (log-verbose (format "built config is ~a" built-config))
+ (install-in-env built-config)
+ (switch-to-configuration built-config))))
+
+
+(define (build-config)
+ (define (optional b args)
+ (if b args '()))
+ (define nix-cmd
+ (append
+ ; use nix-build since it actually prints the outpath
+ `(nix-build ,config-path --no-out-link --log-format bar-with-logs)
+ (optional attribute (list '-A (string-append attribute ".config.system.build.toplevel")))
+ extra-nix-args))
+ (log-verbose nix-cmd)
+ (process-output->string
+ nix-cmd :on-abnormal-exit :error))
+
+
+(define (install-in-env built-config)
+ (define cmd
+ '(nix-env -p /nix/var/nix/profiles/system --set ,built-config))
+
+ (if (or (equal? action 'switch) (equal? action 'boot))
+ (begin
+ (log-verbose cmd)
+ do-process! cmd)
+ (log-verbose
+ "skipping nix-env profile installation")))
+
+
+(define (switch-to-configuration built-config)
+ (define cmd
+ `(systemd-run
+ -E LOCALE_ARCHIVE
+ -E NIXOS_INSTALL_BOOTLOADER
+ --collect
+ ;; --no-ask-password
+ --pty
+ --quiet
+ --same-dir
+ --service-type=exec
+ --unit=nixos-rebuild-switch-to-configuration
+ --wait
+ ,(string-append built-config "/bin/switch-to-configuration")
+ ,action))
+
+ (log-verbose cmd)
+ (unless (do-process cmd)
+ (log "warning: error(s) occurred while switching to the new configuration")))
+
diff --git a/pkgs/apply-config/default.nix b/pkgs/apply-config/default.nix
new file mode 100644
index 0000000..03ba1f9
--- /dev/null
+++ b/pkgs/apply-config/default.nix
@@ -0,0 +1,14 @@
+{ stdenvNoCC, gauche }:
+
+stdenvNoCC.mkDerivation {
+ name = "apply-config";
+
+ src = ./.;
+
+ buildInputs = [ gauche ];
+
+ installPhase = ''
+ mkdir -p $out/bin
+ cp apply-config $out/bin
+ '';
+}
diff --git a/pkgs/overlay.nix b/pkgs/overlay.nix
index f7e4c5f..e3897c1 100644
--- a/pkgs/overlay.nix
+++ b/pkgs/overlay.nix
@@ -200,6 +200,8 @@ in
nomsring = super.haskellPackages.callPackage ./nomsring {};
+ apply-config = self.callPackage ./apply-config {};
+
#### sporadically maintained / updated ####
hikari_unstable = (unstable.hikari.overrideAttrs (old: {