04/09: utils: Support compression and decompression with lzip.

[guix-commits]

civodul pushed a commit to branch master
in repository guix.

commit 4e48923e7523c863996bb616c6abb7e4cb78a3b5
Author: Ludovic Courtès <address@hidden>
Date:   Thu May 23 22:14:53 2019 +0200

    utils: Support compression and decompression with lzip.
    
    * guix/utils.scm (lzip-port): New procedure.
    (decompressed-port, compressed-port, compressed-output-port): Add 'lzip
    case.
    * tests/utils.scm <top level>: Call 'test-compression/decompression' for
    'lzip as well.
---
 guix/utils.scm  | 27 ++++++++++++++++++++++-----
 tests/utils.scm |  3 ++-
 2 files changed, 24 insertions(+), 6 deletions(-)

diff --git a/guix/utils.scm b/guix/utils.scm
index ed1a418..709cdf9 100644
--- a/guix/utils.scm
+++ b/guix/utils.scm
@@ -1,5 +1,5 @@
 ;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2017, 2018 Ludovic Courtès 
<address@hidden>
+;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019 Ludovic Courtès 
<address@hidden>
 ;;; Copyright © 2013, 2014, 2015 Mark H Weaver <address@hidden>
 ;;; Copyright © 2014 Eric Bavier <address@hidden>
 ;;; Copyright © 2014 Ian Denhardt <address@hidden>
@@ -169,6 +169,17 @@ buffered data is lost."
               (close-port out)
               (loop in (cons child pids)))))))))
 
+(define (lzip-port proc port . args)
+  "Return the lzip port produced by calling PROC (a symbol) on PORT and ARGS.
+Raise an error if lzlib support is missing."
+  (let* ((lzlib       (false-if-exception (resolve-interface '(guix lzlib))))
+         (supported?  (and lzlib
+                           ((module-ref lzlib 'lzlib-available?)))))
+    (if supported?
+        (let ((make-port (module-ref lzlib proc)))
+          (values (make-port port) '()))
+        (error "lzip compression not supported" lzlib))))
+
 (define (decompressed-port compression input)
   "Return an input port where INPUT is decompressed according to COMPRESSION,
 a symbol such as 'xz."
@@ -177,17 +188,21 @@ a symbol such as 'xz."
     ('bzip2        (filtered-port `(,%bzip2 "-dc") input))
     ('xz           (filtered-port `(,%xz "-dc") input))
     ('gzip         (filtered-port `(,%gzip "-dc") input))
-    (else          (error "unsupported compression scheme" compression))))
+    ('lzip         (values (lzip-port 'make-lzip-input-port input)
+                           '()))
+    (_             (error "unsupported compression scheme" compression))))
 
 (define (compressed-port compression input)
-  "Return an input port where INPUT is decompressed according to COMPRESSION,
+  "Return an input port where INPUT is compressed according to COMPRESSION,
 a symbol such as 'xz."
   (match compression
     ((or #f 'none) (values input '()))
     ('bzip2        (filtered-port `(,%bzip2 "-c") input))
     ('xz           (filtered-port `(,%xz "-c") input))
     ('gzip         (filtered-port `(,%gzip "-c") input))
-    (else          (error "unsupported compression scheme" compression))))
+    ('lzip         (values (lzip-port 'make-lzip-input-port/compressed input)
+                           '()))
+    (_             (error "unsupported compression scheme" compression))))
 
 (define (call-with-decompressed-port compression port proc)
   "Call PROC with a wrapper around PORT, a file port, that decompresses data
@@ -244,7 +259,9 @@ program--e.g., '(\"--fast\")."
     ('bzip2        (filtered-output-port `(,%bzip2 "-c" ,@options) output))
     ('xz           (filtered-output-port `(,%xz "-c" ,@options) output))
     ('gzip         (filtered-output-port `(,%gzip "-c" ,@options) output))
-    (else          (error "unsupported compression scheme" compression))))
+    ('lzip         (values (lzip-port 'make-lzip-output-port output)
+                           '()))
+    (_             (error "unsupported compression scheme" compression))))
 
 (define* (call-with-compressed-output-port compression port proc
                                            #:key (options '()))
diff --git a/tests/utils.scm b/tests/utils.scm
index a514159..4486138 100644
--- a/tests/utils.scm
+++ b/tests/utils.scm
@@ -23,6 +23,7 @@
   #:use-module (guix utils)
   #:use-module ((guix store) #:select (%store-prefix store-path-package-name))
   #:use-module ((guix search-paths) #:select (string-tokenize*))
+  #:use-module ((guix lzlib) #:select (lzlib-available?))
   #:use-module (srfi srfi-1)
   #:use-module (srfi srfi-11)
   #:use-module (srfi srfi-64)
@@ -214,7 +215,7 @@ skip these tests."
 
 (for-each test-compression/decompression
           '(gzip xz lzip)
-          (list (const #t) (const #t)))
+          (list (const #t) (const #t) lzlib-available?))
 
 ;; This is actually in (guix store).
 (test-equal "store-path-package-name"