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-rw-r--r--guix/utils.scm27
1 files changed, 22 insertions, 5 deletions
diff --git a/guix/utils.scm b/guix/utils.scm
index ed1a418cca..709cdf9353 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 <ludo@gnu.org>
+;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2013, 2014, 2015 Mark H Weaver <mhw@netris.org>
;;; Copyright © 2014 Eric Bavier <bavier@member.fsf.org>
;;; Copyright © 2014 Ian Denhardt <ian@zenhack.net>
@@ -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 '()))