bug#39970: guix commands broken on Azerbaijani 'az_AZ' and Turkish 'tr_TR' locales

["pelzflorian (Florian Pelz)" <pelzflorian@pelzflorian.de>]

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On Thu, Mar 12, 2020 at 05:05:26PM +0100, Ludovic Courtès wrote:
> "pelzflorian (Florian Pelz)" <pelzflorian@pelzflorian.de> skribis:
> > Why would not using a regexp be better?
> 
> It reduces reliance on libc, reduces complexity, and performs better as
> noted in the commit log of 35eb77b09d957019b2437e7681bd88013d67d3cd.

Thank you for your wisdom.  I hope the attached patch is OK.

`LC_ALL=en_US.utf8 make check` is mostly fine (except tests/pack.scm,
which also failed before).

Manual testing of `./pre-inst-env guix environment` works.

`LC_ALL=tr_TR.utf8 make check` is still very unhappy though.
There are many failures.  I will continue to investigate later today.

Regards,
Florian

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From: Florian Pelz <pelzflorian@pelzflorian.de>
Date: Thu, 12 Mar 2020 11:08:16 +0100
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Subject: [PATCH] store: Fix many guix commands failing on some locales.

Partly fixes bug #39970 (see: https://bugs.gnu.org/39970).

At least 'guix environment', 'guix install' and 'guix pull'
on 'az_AZ.utf8' and 'tr_TR.utf8' were affected.

* guix/store.scm (store-path-hash-part): Move base path detection to ...
(store-path-base): ... this new exported procedure.
(store-path-package-name): Use it instead of locale-dependent regexps.
(store-regexp*): Remove.
---
 guix/store.scm | 32 +++++++++++++++-----------------
 1 file changed, 15 insertions(+), 17 deletions(-)

diff --git a/guix/store.scm b/guix/store.scm
index f99fa581a8..5465204f5f 100644
--- a/guix/store.scm
+++ b/guix/store.scm
@@ -2,6 +2,7 @@
 ;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019 Ludovic Courtès <ludo@gnu.org>
 ;;; Copyright © 2018 Jan Nieuwenhuizen <janneke@gnu.org>
 ;;; Copyright © 2019 Mathieu Othacehe <m.othacehe@gmail.com>
+;;; Copyright © 2020 Florian Pelz <pelzflorian@pelzflorian.de>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -43,7 +44,6 @@
   #:use-module (srfi srfi-35)
   #:use-module (srfi srfi-39)
   #:use-module (ice-9 match)
-  #:use-module (ice-9 regex)
   #:use-module (ice-9 vlist)
   #:use-module (ice-9 popen)
   #:use-module (ice-9 threads)
@@ -172,6 +172,7 @@
             store-path?
             direct-store-path?
             derivation-path?
+            store-path-base
             store-path-package-name
             store-path-hash-part
             direct-store-path
@@ -1943,29 +1944,26 @@ valid inputs."
   "Return #t if PATH is a derivation path."
   (and (store-path? path) (string-suffix? ".drv" path)))
 
-(define store-regexp*
-  ;; The substituter makes repeated calls to 'store-path-hash-part', hence
-  ;; this optimization.
-  (mlambda (store)
-    "Return a regexp matching a file in STORE."
-    (make-regexp (string-append "^" (regexp-quote store)
-                                "/([0-9a-df-np-sv-z]{32})-([^/]+)$"))))
+(define (store-path-base path)
+  "Return the base path of a path in the store."
+  (and (string-prefix? (%store-prefix) path)
+       (let ((base (string-drop path (+ 1 (string-length (%store-prefix))))))
+         (and (> (string-length base) 33)
+              (not (string-index base #\/))
+              base))))
 
 (define (store-path-package-name path)
   "Return the package name part of PATH, a file name in the store."
-  (let ((path-rx (store-regexp* (%store-prefix))))
-    (and=> (regexp-exec path-rx path)
-           (cut match:substring <> 2))))
+  (let ((base (store-path-base path)))
+    (string-drop base (+ 32 1)))) ;32 hash part + 1 hyphen
 
 (define (store-path-hash-part path)
   "Return the hash part of PATH as a base32 string, or #f if PATH is not a
 syntactically valid store path."
-  (and (string-prefix? (%store-prefix) path)
-       (let ((base (string-drop path (+ 1 (string-length (%store-prefix))))))
-         (and (> (string-length base) 33)
-              (let ((hash (string-take base 32)))
-                (and (string-every %nix-base32-charset hash)
-                     hash))))))
+  (let* ((base (store-path-base path))
+         (hash (string-take base 32)))
+    (and (string-every %nix-base32-charset hash)
+         hash)))
 
 (define (derivation-log-file drv)
   "Return the build log file for DRV, a derivation file name, or #f if it
-- 
2.25.1