From 9b747e011b72f1bf203f5b35066b19531bb916f0 Mon Sep 17 00:00:00 2001
From: Levi Neely <lkn@darkstar.example.net>
Date: Sat, 18 Apr 2026 19:19:59 +0200
Subject: [PATCH] p9: add writable s/{id}/env file for session-scoped env
 injection

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
---
 internal/p9/sessionfilestore.go | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/internal/p9/sessionfilestore.go b/internal/p9/sessionfilestore.go
index de57789..7377e42 100644
--- a/internal/p9/sessionfilestore.go
+++ b/internal/p9/sessionfilestore.go
@@ -33,6 +33,7 @@ var sessionFileList = []struct {
 	{"mcp", 0444},
 	{"systemprompt", 0444},
 	{"params", 0666},
+	{"env", 0200},
 }
 
 // SessionFileStore implements ReadWriteStore for the files within a single
@@ -152,6 +153,15 @@ func (s *SessionFileStore) Put(name string, data []byte) error {
 		}
 		return s.sess.core.SetGenerationParams(params)
 
+	case "env":
+		for _, line := range strings.Split(string(data), "\n") {
+			k, v, ok := strings.Cut(strings.TrimSpace(line), "=")
+			if !ok || k == "" {
+				continue
+			}
+			s.sess.core.SetEnv(k, v)
+		}
+
 	}
 	return nil
 }