build: Require Guile >= 2.0.9.

* configure.ac: Bump requirement to 2.0.9.
* doc/guix.texi (Requirements): Adjust accordingly.
* README (Requirements): Likewise.
* build-aux/download.scm: Remove workaround for <http://bugs.gnu.org/13095>.
* guix/build/download.scm: Likewise.
(http-fetch)[post-2.0.7?]: Remove.  Remove conditional code for not
POST-2.0.7?.
* guix/http-client.scm:  Remove workaround for <http://bugs.gnu.org/13095>.
(http-fetch)[post-2.0.7?]: Remove.  Remove conditional code for not
POST-2.0.7?.
* guix/serialization.scm (read-latin1-string): Remove mention of 2.0.9.
* tests/nar.scm: Use (ice-9 control).
(let/ec): Remove.

3 files changed, 7 insertions, 40 deletions

diff --git a/guix/build/download.scm b/guix/build/download.scm
index e7a7afecd1..d956a9f33e 100644
--- a/guix/build/download.scm
+++ b/guix/build/download.scm
@@ -512,12 +512,6 @@ port if PORT is a TLS session record port."
                 'set-port-encoding!
                 (lambda (p e) #f))
 
-;; XXX: Work around <http://bugs.gnu.org/13095>, present in Guile
-;; up to 2.0.7.
-(module-define! (resolve-module '(web client))
-                'shutdown (const #f))
-
-
 ;; XXX: Work around <http://bugs.gnu.org/23421>, fixed in Guile commit
 ;; 16050431f29d56f80c4a8253506fc851b8441840.  Guile's date validation
 ;; procedure rejects dates in which the hour is not padded with a zero but
@@ -682,12 +676,6 @@ the connection could not be established in less than TIMEOUT seconds.  Return
 FILE on success.  When VERIFY-CERTIFICATE? is true, verify HTTPS
 certificates; otherwise simply ignore them."
 
-  (define post-2.0.7?
-    (or (> (string->number (major-version)) 2)
-        (> (string->number (minor-version)) 0)
-        (> (string->number (micro-version)) 7)
-        (string>? (version) "2.0.7")))
-
   (define headers
     `(;; Some web sites, such as http://dist.schmorp.de, would block you if
       ;; there's no 'User-Agent' header, presumably on the assumption that
@@ -712,20 +700,9 @@ certificates; otherwise simply ignore them."
                                           #:verify-certificate?
                                           verify-certificate?))
                 ((resp bv-or-port)
-                 ;; XXX: `http-get*' was introduced in 2.0.7, and replaced by
-                 ;; #:streaming? in 2.0.8.  We know we're using it within the
-                 ;; chroot, but `guix-download' might be using a different
-                 ;; version.  So keep this compatibility hack for now.
-                 (if post-2.0.7?
-                     (http-get uri #:port connection #:decode-body? #f
-                               #:streaming? #t
-                               #:headers headers)
-                     (if (module-defined? (resolve-interface '(web client))
-                                          'http-get*)
-                         (http-get* uri #:port connection #:decode-body? #f
-                                    #:headers headers)
-                         (http-get uri #:port connection #:decode-body? #f
-                                   #:extra-headers headers))))
+                 (http-get uri #:port connection #:decode-body? #f
+                           #:streaming? #t
+                           #:headers headers))
                 ((code)
                  (response-code resp))
                 ((size)
diff --git a/guix/http-client.scm b/guix/http-client.scm
index 78d39a0208..855ae95a43 100644
--- a/guix/http-client.scm
+++ b/guix/http-client.scm
@@ -217,10 +217,6 @@ or if EOF is reached."
    (when (module-variable %web-http 'read-line*)
      (module-set! %web-http 'read-line* read-header-line))))
 
-;; XXX: Work around <http://bugs.gnu.org/13095>, present in Guile
-;; up to 2.0.7.
-(module-define! (resolve-module '(web client))
-                'shutdown (const #f))
 
 (define* (http-fetch uri #:key port (text? #f) (buffered? #t)
                      keep-alive? (verify-certificate? #t)
@@ -252,14 +248,9 @@ Raise an '&http-get-error' condition if downloading fails."
       (unless (or buffered? (not (file-port? port)))
         (setvbuf port _IONBF))
       (let*-values (((resp data)
-                     ;; Try hard to use the API du jour to get an input port.
-                     (if (guile-version>? "2.0.7")
-                         (http-get uri #:streaming? #t #:port port
-                                   #:keep-alive? #t
-                                   #:headers headers)        ; 2.0.9+
-                         (http-get* uri #:decode-body? text?        ; 2.0.7
-                                    #:keep-alive? #t
-                                    #:port port #:headers headers)))
+                     (http-get uri #:streaming? #t #:port port
+                               #:keep-alive? #t
+                               #:headers headers))
                     ((code)
                      (response-code resp)))
         (case code
diff --git a/guix/serialization.scm b/guix/serialization.scm
index 4cab5910f7..4a8cd2086e 100644
--- a/guix/serialization.scm
+++ b/guix/serialization.scm
@@ -130,8 +130,7 @@
   ;; <http://bugs.gnu.org/19621>.  See <http://bugs.gnu.org/19610> for
   ;; a discussion.
   (let ((bv (read-byte-string p)))
-    ;; XXX: Rewrite using (ice-9 iconv) when the minimum requirement is
-    ;; upgraded to Guile >= 2.0.9.
+    ;; XXX: Rewrite using (ice-9 iconv).
     (list->string (map integer->char (bytevector->u8-list bv)))))
 
 (define (read-maybe-utf8-string p)