From 7f70abf80ce03ac5b25175df57fe73eb71d20966 Mon Sep 17 00:00:00 2001
From: Vincent Haupert <vincent@yaxi.tech>
Date: Tue, 1 Aug 2023 18:08:29 +0200
Subject: [PATCH] nixos/image: write `systemd-repart` output to
 `$out/repart-output.json`

Write the output of `systemd-repart` as a JSON file to
`$out/repart-output.json`.

Depending on the repart configuration, the output of `systemd-repart`
contains important information, for example, when creating verity
partitions:

> The verity root hash itself will be included in the output of
> systemd-repart.

See `Verity=` in repart.d(5).
---
 nixos/modules/image/repart.nix | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/nixos/modules/image/repart.nix b/nixos/modules/image/repart.nix
index 9e7fe6932b3..4362982f5ba 100644
--- a/nixos/modules/image/repart.nix
+++ b/nixos/modules/image/repart.nix
@@ -195,7 +195,9 @@ in
           --seed="${cfg.seed}" \
           --definitions="$amendedRepartDefinitions" \
           --split="${lib.boolToString cfg.split}" \
-          image.raw
+          --json=pretty \
+          image.raw \
+          | tee repart-output.json
       '';
 
     meta = {