From 81cc4f06abc644b047e0758309cfbd982dac18ed Mon Sep 17 00:00:00 2001
From: tv <tv@krebsco.de>
Date: Thu, 12 Nov 2026 02:33:44 +0000
Subject: populate pipe: deliver changed output of the same size

pipe sources get a fixed modification time, so rsync's quick check took
changed output of the same size, e.g. a new commit hash or token, for
unchanged, and didn't deliver it.  pipe sources get synced comparing
checksums now.

An edge case changes a pipe source's output without changing its size.
---
 pkgs/populate/default.nix | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'pkgs/populate')

diff --git a/pkgs/populate/default.nix b/pkgs/populate/default.nix
index 0992b0c..5939742 100644
--- a/pkgs/populate/default.nix
+++ b/pkgs/populate/default.nix
@@ -773,7 +773,9 @@ let
     ${quote source.command} > "$out"
     ${coreutils}/bin/touch -t 300001010000 "$out"
 
-    ${rsync' target rsyncDefaultConfig /* sh */ "$out"}
+    # With the fixed modification time, only checksums tell outputs of the
+    # same size apart.
+    ${rsync' target (rsyncDefaultConfig // { useChecksum = true; }) /* sh */ "$out"}
   '';
 
   # TODO rm -fR instead of ln -f?
-- 
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