From 6dbd72118e6be250300e355498f292cb0003f4f6 Mon Sep 17 00:00:00 2001
From: Peter Bex <peter@more-magic.net>
Date: Wed, 15 Aug 2018 21:30:06 +0200
Subject: Drop hard dependency on posix-groups so Spiffy works again on Windows

---
 spiffy.egg |  2 +-
 spiffy.scm | 33 ++++++++++++++++++++++++++-------
 2 files changed, 27 insertions(+), 8 deletions(-)

diff --git a/spiffy.egg b/spiffy.egg
index 24554b0..084a084 100644
--- a/spiffy.egg
+++ b/spiffy.egg
@@ -5,7 +5,7 @@
  (maintainer "Peter Bex")
  (category web)
  (license "BSD")
- (dependencies intarweb uri-common uri-generic sendfile posix-groups
+ (dependencies intarweb uri-common uri-generic sendfile
                srfi-1 srfi-13 srfi-14 srfi-18)
  (test-dependencies test)
  (components (extension spiffy (csc-options "-O3"))
diff --git a/spiffy.scm b/spiffy.scm
index 91e6bee..83f51cf 100644
--- a/spiffy.scm
+++ b/spiffy.scm
@@ -56,11 +56,10 @@
         (chicken file posix) (chicken process signal) (chicken load)
         (chicken process-context) (chicken process-context posix)
         srfi-1 srfi-13 srfi-14 srfi-18
-        posix-groups uri-common sendfile
-        (rename intarweb (headers intarweb:headers)))
+        uri-common sendfile (rename intarweb (headers intarweb:headers)))
 
 (define version 6)
-(define release 0)
+(define release 1)
 
 ;;; Request processing information
 (define current-request     (make-parameter #f))
@@ -544,6 +543,28 @@
 (unless (eq? (build-platform) 'msvc)
   (set-signal-handler! signal/int (lambda (sig) (exit 1))))
 
+;; Imports from the named module, if available
+(define (dynamic-import module symbol default)
+  (handle-exceptions _ default (eval `(let () (import ,module) ,symbol))))
+
+;; posix-groups is UNIX-only, so avoid a hard dependency on it.
+(define group-information
+  (dynamic-import
+   'posix-groups 'group-information
+   (lambda (group)
+     (error 'group-information
+            "If you set (spiffy-group) or call switch-user/group directly with a group, you must install the posix-groups egg first!" group))))
+
+(define initialize-groups
+  (dynamic-import
+   'posix-groups 'initialize-groups
+   (lambda (user info)
+     (cond-expand
+       (windows (void))                 ; Skip it on Windows
+       (else
+        (error 'initialize-groups
+               "If you set (spiffy-user) or call switch-user/group directly with a user, you must install the posix-groups egg first!" user info))))))
+
 (define (switch-user/group user group)
   (when group    ; group first, since only superuser can switch groups
     (let ((ginfo (group-information group)))
@@ -580,10 +601,8 @@
         (mutex-unlock! m)
         (begin (mutex-unlock! m condition) (retry)))))
 
-;; Imports from the openssl egg, if available
-(define (dynamic-import module symbol default)
-  (handle-exceptions _ default (eval `(let () (import ,module) ,symbol))))
-
+;; SSL is optional, don't force openssl on someone who just wants a
+;; plain HTTP server.  It's also a pain to install on Windows.
 (define ssl-port?
   (dynamic-import 'openssl 'ssl-port? (lambda (v) #f)))
 
-- 
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