01/01: Revert "guix: Compress and decompress xz archives in parallel."

[Marius Bakke]

mbakke pushed a commit to branch master
in repository guix.

commit e9be2c5409f37173d70b202aa06752e3814ccdc2
Author: Marius Bakke <address@hidden>
Date:   Sun Jul 22 18:01:35 2018 +0200

    Revert "guix: Compress and decompress xz archives in parallel."
    
    Threaded compression makes archives non-deterministic: the result depends on
    the number of threads used for compressing.  See 
<https://bugs.gnu.org/31015>.
    
    This reverts commit 63102406f22412bb922de5549deb89d3594a38c0.
---
 guix/scripts/pack.scm | 5 ++---
 guix/utils.scm        | 7 +++----
 2 files changed, 5 insertions(+), 7 deletions(-)

diff --git a/guix/scripts/pack.scm b/guix/scripts/pack.scm
index 6d5d745..7298508 100644
--- a/guix/scripts/pack.scm
+++ b/guix/scripts/pack.scm
@@ -1,6 +1,5 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2015, 2017, 2018 Ludovic Courtès <address@hidden>
-;;; Copyright © 2017 Efraim Flashner <address@hidden>
 ;;; Copyright © 2017, 2018 Ricardo Wurmus <address@hidden>
 ;;; Copyright © 2018 Konrad Hinsen <address@hidden>
 ;;; Copyright © 2018 Chris Marusich <address@hidden>
@@ -69,7 +68,7 @@
         (compressor "lzip"  ".lz"
                     #~(#+(file-append lzip "/bin/lzip") "-9"))
         (compressor "xz"    ".xz"
-                    #~(#+(file-append xz "/bin/xz") "-e -T0"))
+                    #~(#+(file-append xz "/bin/xz") "-e"))
         (compressor "bzip2" ".bz2"
                     #~(#+(file-append bzip2 "/bin/bzip2") "-9"))
         (compressor "none" "" #f)))
@@ -77,7 +76,7 @@
 ;; This one is only for use in this module, so don't put it in %compressors.
 (define bootstrap-xz
   (compressor "bootstrap-xz" ".xz"
-              #~(#+(file-append %bootstrap-coreutils&co "/bin/xz") "-e -T0")))
+              #~(#+(file-append %bootstrap-coreutils&co "/bin/xz") "-e")))
 
 (define (lookup-compressor name)
   "Return the compressor object called NAME.  Error out if it could not be
diff --git a/guix/utils.scm b/guix/utils.scm
index 200bb69..9bad06d 100644
--- a/guix/utils.scm
+++ b/guix/utils.scm
@@ -5,7 +5,6 @@
 ;;; Copyright © 2014 Ian Denhardt <address@hidden>
 ;;; Copyright © 2016 Mathieu Lirzin <address@hidden>
 ;;; Copyright © 2015 David Thompson <address@hidden>
-;;; Copyright © 2017 Efraim Flashner <address@hidden>
 ;;; Copyright © 2017 Mathieu Othacehe <address@hidden>
 ;;; Copyright © 2018 Marius Bakke <address@hidden>
 ;;;
@@ -176,7 +175,7 @@ a symbol such as 'xz."
   (match compression
     ((or #f 'none) (values input '()))
     ('bzip2        (filtered-port `(,%bzip2 "-dc") input))
-    ('xz           (filtered-port `(,%xz "-dc" "-T0") input))
+    ('xz           (filtered-port `(,%xz "-dc") input))
     ('gzip         (filtered-port `(,%gzip "-dc") input))
     (else          (error "unsupported compression scheme" compression))))
 
@@ -186,7 +185,7 @@ a symbol such as 'xz."
   (match compression
     ((or #f 'none) (values input '()))
     ('bzip2        (filtered-port `(,%bzip2 "-c") input))
-    ('xz           (filtered-port `(,%xz "-c" "-T0") input))
+    ('xz           (filtered-port `(,%xz "-c") input))
     ('gzip         (filtered-port `(,%gzip "-c") input))
     (else          (error "unsupported compression scheme" compression))))
 
@@ -243,7 +242,7 @@ program--e.g., '(\"--fast\")."
   (match compression
     ((or #f 'none) (values output '()))
     ('bzip2        (filtered-output-port `(,%bzip2 "-c" ,@options) output))
-    ('xz           (filtered-output-port `(,%xz "-c" "-T0" ,@options) output))
+    ('xz           (filtered-output-port `(,%xz "-c" ,@options) output))
     ('gzip         (filtered-output-port `(,%gzip "-c" ,@options) output))
     (else          (error "unsupported compression scheme" compression))))