http-client: Avoid name clash with 'open-connection-for-uri' in 2.2.0.

* guix/build/download.scm (open-connection-for-uri): Add note about
same-named binding in Guile 2.2.0.
* guix/http-client.scm: Use 'guix:open-connection-for-uri' for the
procedure coming from (guix build download).
* guix/scripts/lint.scm: Likewise.
* guix/scripts/substitute.scm: Likewise.

guix/build/download.scm

@@ -464,6 +464,9 @@ ETIMEDOUT error is raised."
   "Like 'open-socket-for-uri', but also handle HTTPS connections.  The
 resulting port must be closed with 'close-connection'.  When
 VERIFY-CERTIFICATE? is true, verify HTTPS server certificates."
+  ;; Note: Guile 2.2.0's (web client) has a same-named export that's actually
+  ;; undefined.  See Guile commit 011669af3b428e5626f7bbf66b11d57d9768c047.
+
   (define https?
     (eq? 'https (uri-scheme uri)))
 

guix/http-client.scm

@@ -38,7 +38,9 @@
                 #:select (mkdir-p dump-port))
   #:use-module ((guix build download)
                 #:select (open-socket-for-uri
-                          open-connection-for-uri resolve-uri-reference))
+                          (open-connection-for-uri
+                           . guix:open-connection-for-uri)
+                          resolve-uri-reference))
   #:re-export (open-socket-for-uri)
   #:export (&http-get-error
             http-get-error?
@@ -234,9 +236,9 @@ Raise an '&http-get-error' condition if downloading fails."
   (let loop ((uri (if (string? uri)
                       (string->uri uri)
                       uri)))
-    (let ((port (or port (open-connection-for-uri uri
-                                                  #:verify-certificate?
-                                                  verify-certificate?)))
+    (let ((port (or port (guix:open-connection-for-uri uri
+                                                       #:verify-certificate?
+                                                       verify-certificate?)))
           (headers (match (uri-userinfo uri)
                      ((? string? str)
                       (cons (cons 'Authorization

guix/scripts/lint.scm

@@ -44,7 +44,8 @@
   #:use-module (web uri)
   #:use-module ((guix build download)
                 #:select (maybe-expand-mirrors
-                          open-connection-for-uri
+                          (open-connection-for-uri
+                           . guix:open-connection-for-uri)
                           close-connection))
   #:use-module (web request)
   #:use-module (web response)
@@ -377,7 +378,8 @@ for connections to complete; when TIMEOUT is #f, wait as long as needed."
       ((or 'http 'https)
        (catch #t
          (lambda ()
-           (let ((port    (open-connection-for-uri uri #:timeout timeout))
+           (let ((port    (guix:open-connection-for-uri
+                           uri #:timeout timeout))
                  (request (build-request uri #:headers headers)))
              (define response
                (dynamic-wind

guix/scripts/substitute.scm

@@ -1,5 +1,5 @@
 ;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2013, 2014, 2015, 2016 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2013, 2014, 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org>
 ;;; Copyright © 2014 Nikita Karetnikov <nikita@karetnikov.org>
 ;;;
 ;;; This file is part of GNU Guix.
@@ -34,7 +34,8 @@
   #:use-module ((guix build download)
                 #:select (current-terminal-columns
                           progress-proc uri-abbreviation nar-uri-abbreviation
-                          open-connection-for-uri
+                          (open-connection-for-uri
+                           . guix:open-connection-for-uri)
                           close-connection
                           store-path-abbreviation byte-count->string))
   #:use-module (ice-9 rdelim)
@@ -210,8 +211,8 @@ provide."
                  (close-connection port))))
            (begin
              (when (or (not port) (port-closed? port))
-               (set! port (open-connection-for-uri uri
-                                                   #:verify-certificate? #f))
+               (set! port (guix:open-connection-for-uri
+                           uri #:verify-certificate? #f))
                (unless (or buffered? (not (file-port? port)))
                  (setvbuf port _IONBF)))
              (http-fetch uri #:text? #f #:port port
@@ -247,9 +248,10 @@ failure, return #f and #f."
                    read-cache-info)
                  #f))
         ((http https)
-         (let ((port (open-connection-for-uri uri
-                                              #:verify-certificate? #f
-                                              #:timeout %fetch-timeout)))
+         (let ((port (guix:open-connection-for-uri
+                      uri
+                      #:verify-certificate? #f
+                      #:timeout %fetch-timeout)))
            (guard (c ((http-get-error? c)
                       (warning (_ "while fetching '~a': ~a (~s)~%")
                                (uri->string (http-get-error-uri c))
@@ -533,9 +535,10 @@ initial connection on which HTTP requests are sent."
                 (result   seed))
     ;; (format (current-error-port) "connecting (~a requests left)..."
     ;;         (length requests))
-    (let ((p (or port (open-connection-for-uri base-uri
-                                               #:verify-certificate?
-                                               verify-certificate?))))
+    (let ((p (or port (guix:open-connection-for-uri
+                       base-uri
+                       #:verify-certificate?
+                       verify-certificate?))))
       ;; For HTTPS, P is not a file port and does not support 'setvbuf'.
       (when (file-port? p)
         (setvbuf p _IOFBF (expt 2 16)))