From 9cf4f170aefaf85d01cb1710c192f9f5b56ab694 Mon Sep 17 00:00:00 2001
From: lassulus <lassulus@lassul.us>
Date: Wed, 23 Nov 2022 13:28:52 +0100
Subject: add zapCreateMount script for idempodents install from iso/kexec

---
 cli.nix     |  2 ++
 default.nix |  4 ++++
 disko       |  4 ++--
 types.nix   | 20 ++++++++++++++++++++
 4 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/cli.nix b/cli.nix
index e29b340..72a1c3c 100644
--- a/cli.nix
+++ b/cli.nix
@@ -16,6 +16,8 @@ let
     disko.createScript diskFormat pkgs
   else if (mode == "mount") then
     disko.mountScript diskFormat pkgs
+  else if (mode = "zap_create_mount") then
+    disko.zapCreateMount diskFormat pkgs
   else
     builtins.abort "invalid mode"
   ;
diff --git a/default.nix b/default.nix
index 8d91e7c..03a6833 100644
--- a/default.nix
+++ b/default.nix
@@ -24,6 +24,10 @@ in {
     export PATH=${lib.makeBinPath (types.diskoLib.packages (eval cfg).config.devices pkgs)}
     ${types.diskoLib.mount (eval cfg).config.devices}
   '';
+  zapCreateMount = cfg: pkgs: pkgs.writeScript "disko-zap-create-mount" ''
+    export PATH=${lib.makeBinPath (types.diskoLib.packages (eval cfg).config.devices pkgs)}
+    ${types.diskoLib.zapCreateMount (eval cfg).config.devices}
+  '';
   config = cfg: { imports = types.diskoLib.config (eval cfg).config.devices; };
   packages = cfg: types.diskoLib.packages (eval cfg).config.devices;
 }
diff --git a/disko b/disko
index d641304..a48907f 100755
--- a/disko
+++ b/disko
@@ -87,8 +87,8 @@ while [[ $# -gt 0 ]]; do
   shift
 done
 
-if ! ([[ $mode = "create" ]] || [[ $mode = "mount" ]]); then
-  abort "mode must be either create or mount"
+if ! ([[ $mode = "create" ]] || [[ $mode = "mount" ]] || [[ $mode = "zap_create_mount" ]]); then
+  abort "mode must be either create, mount or zap_create_mount"
 fi
 
 if [[ ! -z "${flake+x}" ]]; then
diff --git a/types.nix b/types.nix
index e09ca9d..92f11fb 100644
--- a/types.nix
+++ b/types.nix
@@ -146,6 +146,26 @@ rec {
       # ensures that "/" is processed before "/foo" etc.
       ${concatStrings (attrValues fsMounts)}
     '';
+    /* takes a disko device specification and returns a string which unmounts, destroys all disks and then runs create and mount
+
+       zapCreateMount :: types.devices -> str
+    */
+    zapCreateMount = devices: ''
+      set -efux
+      # print existing disks
+      lsblk
+
+      # TODO get zap the same way we get create
+      # make partitioning idempotent by dismounting already mounted filesystems
+      if findmnt /mnt; then
+        umount -Rlv /mnt
+      fi
+
+      echo 'creating partitions...'
+      ${diskoLib.create devices}
+      echo 'mounting partitions...'
+      ${diskoLib.mount devices}
+    '';
     /* Takes a disko device specification and returns a nixos configuration
 
        config :: types.devices -> nixosConfig
-- 
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