From 66add2cd9edab96f5e87477229772bf2b3ca513a Mon Sep 17 00:00:00 2001
From: lassulus <lassulus@lassul.us>
Date: Thu, 8 Dec 2022 21:03:11 +0100
Subject: zap: destroy all mdadm devices if mdadm is in PATH

---
 README.md |  2 +-
 types.nix | 11 +++++++----
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/README.md b/README.md
index 333f2a6..845fcd6 100644
--- a/README.md
+++ b/README.md
@@ -114,7 +114,7 @@ $ nix-channel --update
 
 ``` nix
 {
-  imports = [ "${builtins.fetchTarball "https://github.com/nix-community/disko/archive/main.tar.gz"}/modules/disko.nix" ];
+  imports = [ "${builtins.fetchTarball "https://github.com/nix-community/disko/archive/master.tar.gz"}/module.nix" ];
 }
 ```
 
diff --git a/types.nix b/types.nix
index fa24607..fa6bc44 100644
--- a/types.nix
+++ b/types.nix
@@ -147,6 +147,7 @@ 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
@@ -164,10 +165,12 @@ rec {
       fi
 
       # stop all existing raids
-      for r in /dev/md/* /dev/md[0-9]*; do
-        # might fail if the device was already closed in the loop
-        mdadm --stop "$r" || true
-      done
+      if command -v mdadm; then
+        for r in /dev/md/* /dev/md[0-9]*; do
+          # might fail if the device was already closed in the loop
+          mdadm --stop "$r" || true
+        done
+      fi
 
       echo 'creating partitions...'
       ${diskoLib.create devices}
-- 
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