From 5aed6f9b25b8547feb67bbbfaa263d013b82fb52 Mon Sep 17 00:00:00 2001
From: John Ericson <John.Ericson@Obsidian.Systems>
Date: Fri, 4 Sep 2020 15:58:42 +0000
Subject: [PATCH] Document `mkOutputString`
---
src/libexpr/primops.cc | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc
index 4e248f979..78dc314fa 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -75,6 +75,18 @@ void EvalState::realiseContext(const PathSet & context)
}
}
+/* Add and attribute to the given attribute map from the output name to
+ the output path, or a placeholder.
+
+ Where possible the path is used, but for floating CA derivations we
+ may not know it. For sake of determinism we always assume we don't
+ and instead put in a place holder. In either case, however, the
+ string context will contain the drv path and output name, so
+ downstream derivations will have the proper dependency, and in
+ addition, before building, the placeholder will be rewritten to be
+ the actual path.
+
+ The 'drv' and 'drvPath' outputs must correspond. */
static void mkOutputString(EvalState & state, Value & v,
const StorePath & drvPath, const BasicDerivation & drv,
std::pair<string, DerivationOutput> o)
--
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