'bazaar.scm' is for testing.  The following warnings appear during the
installation:

GNU gettext msgfmt utility not found!

patch-shebang: ./tools/packaging/lp-upload-release: warning: no binary for 
interpreter `zsh' found in $PATH

patch-shebang: ./tools/weavemerge.sh: warning: no binary for interpreter `zsh' 
found in $PATH

Can we replace 'zsh' with 'bash'?  I guess there may be some
compatibility problems.

Should we package 'zsh' instead?  I haven't checked, but it seems there
are two tarballs: the first one contains sources and the second contains
docs.  Is there a way to specify both in a single recipe?

Also, I should mention that I don't understand some parts of the build
system.  I'm not sure how to check them.  Is there a Scheme level
'strace'-like tool?  If not, I'll send more specific questions later.

From aa73cd5d8e5e48d24460c9d6bcebfc92b3311d4c Mon Sep 17 00:00:00 2001
From: Nikita Karetnikov <nik...@karetnikov.org>
Date: Sun, 28 Apr 2013 16:08:23 +0000
Subject: [PATCH] utils: Adjust 'wrap-program'.

* guix/build/utils.scm (wrap-program): Assume that 'prog' is an
  absolute filename.  Adjust 'prog-real' and 'prog-tmp' accordingly.
  Also, change 'prog-tmp' to honor command line arguments.
---
 guix/build/utils.scm |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/guix/build/utils.scm b/guix/build/utils.scm
index 356dd46..fe6978b 100644
--- a/guix/build/utils.scm
+++ b/guix/build/utils.scm
@@ -680,8 +680,8 @@ contents:
 This is useful for scripts that expect particular programs to be in $PATH, for
 programs that expect particular shared libraries to be in $LD_LIBRARY_PATH, or
 modules in $GUILE_LOAD_PATH, etc."
-  (let ((prog-real (string-append "." prog "-real"))
-        (prog-tmp  (string-append "." prog "-tmp")))
+  (let ((prog-real (string-append (dirname prog) "/." (basename prog) "-real"))
+        (prog-tmp  (string-append (dirname prog) "/." (basename prog) "-tmp")))
     (define (export-variable lst)
       ;; Return a string that exports an environment variable.
       (match lst
@@ -709,11 +709,11 @@ modules in $GUILE_LOAD_PATH, etc."
     (with-output-to-file prog-tmp
       (lambda ()
         (format #t
-                "#!~a~%~a~%exec ~a~%"
+                "#!~a~%~a~%exec ~a $@~%"
                 (which "bash")
                 (string-join (map export-variable vars)
                              "\n")
-                (canonicalize-path prog-real))))
+                prog-real)))
 
     (chmod prog-tmp #o755)
     (rename-file prog-tmp prog)))
-- 
1.7.5.4

From e217b27883223f4c6adc39c4ed3c1af6d1ddf4af Mon Sep 17 00:00:00 2001
From: Nikita Karetnikov <nik...@karetnikov.org>
Date: Sun, 28 Apr 2013 12:55:27 +0000
Subject: [PATCH] Add 'python-build-system'.

* guix/build-system/python.scm, guix/build/python-build-system.scm: New files.
* Makefile.am (MODULES): Add them.
---
 Makefile.am                        |    2 +
 guix/build-system/python.scm       |  111 ++++++++++++++++++++++++++++++++++++
 guix/build/python-build-system.scm |   89 +++++++++++++++++++++++++++++
 3 files changed, 202 insertions(+), 0 deletions(-)
 create mode 100644 guix/build-system/python.scm
 create mode 100644 guix/build/python-build-system.scm

diff --git a/Makefile.am b/Makefile.am
index 847d850..7172a90 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -46,6 +46,7 @@ MODULES =					\
   guix/build-system/cmake.scm			\
   guix/build-system/gnu.scm			\
   guix/build-system/perl.scm			\
+  guix/build-system/python.scm			\
   guix/build-system/trivial.scm			\
   guix/ftp-client.scm				\
   guix/web.scm					\
@@ -56,6 +57,7 @@ MODULES =					\
   guix/build/cmake-build-system.scm		\
   guix/build/gnu-build-system.scm		\
   guix/build/perl-build-system.scm		\
+  guix/build/python-build-system.scm		\
   guix/build/utils.scm				\
   guix/build/union.scm				\
   guix/packages.scm				\
diff --git a/guix/build-system/python.scm b/guix/build-system/python.scm
new file mode 100644
index 0000000..55d752a
--- /dev/null
+++ b/guix/build-system/python.scm
@@ -0,0 +1,111 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2013 Ludovic Courtès <l...@gnu.org>
+;;; Copyright © 2013 Nikita Karetnikov <nik...@karetnikov.org>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (guix build-system python)
+  #:use-module (guix store)
+  #:use-module (guix utils)
+  #:use-module (guix packages)
+  #:use-module (guix derivations)
+  #:use-module (guix build-system)
+  #:use-module (guix build-system gnu)
+  #:use-module (ice-9 match)
+  #:export (python-build
+            python-build-system))
+
+;; Commentary:
+;;
+;; Standard build procedure for Python packages using 'setup.py'.  This is
+;; implemented as an extension of 'gnu-build-system'.
+;;
+;; Code:
+
+(define* (python-build store name source inputs
+                       #:key
+                       (python (@ (gnu packages python) python))
+                       (python-version
+                        (string-take (package-version
+                                      (@ (gnu packages python) python)) 3))
+                       (tests? #t)
+                       (configure-flags ''())
+                       (phases '(@ (guix build python-build-system)
+                                   %standard-phases))
+                       (outputs '("out"))
+                       (search-paths '())
+                       (system (%current-system))
+                       (guile #f)
+                       (imported-modules '((guix build python-build-system)
+                                           (guix build gnu-build-system)
+                                           (guix build utils)))
+                       (modules '((guix build python-build-system)
+                                  (guix build gnu-build-system)
+                                  (guix build utils))))
+  "Build SOURCE using PYTHON, and with INPUTS.  This assumes that SOURCE
+provides a 'setup.py' file as its build system."
+  (define builder
+    `(begin
+       (use-modules ,@modules)
+       (python-build #:name ,name
+                     #:source ,(if (and source (derivation-path? source))
+                                   (derivation-path->output-path source)
+                                   source)
+                     #:configure-flags ,configure-flags
+                     #:system ,system
+                     #:test-target "test"
+                     #:tests? ,tests?
+                     #:outputs %outputs
+                     #:python-version ,python-version
+                     #:search-paths ',(map search-path-specification->sexp
+                                           (append search-paths
+                                                   (standard-search-paths)))
+                     #:inputs %build-inputs)))
+
+  (define guile-for-build
+    (match guile
+      ((? package?)
+       (package-derivation store guile system))
+      ((and (? string?) (? derivation-path?))
+       guile)
+      (#f                                         ; the default
+       (let* ((distro (resolve-interface '(gnu packages base)))
+              (guile  (module-ref distro 'guile-final)))
+         (package-derivation store guile system)))))
+
+  (let ((python (package-derivation store python system)))
+    (build-expression->derivation store name system
+                                  builder
+                                  `(,@(if source
+                                          `(("source" ,source))
+                                          '())
+                                    ("python" ,python)
+                                    ,@inputs
+
+                                    ;; Keep the standard inputs of
+                                    ;; 'gnu-build-system'.
+                                    ,@(standard-inputs system))
+
+                                  #:modules imported-modules
+                                  #:outputs outputs
+                                  #:guile-for-build guile-for-build)))
+
+(define python-build-system
+  (build-system (name 'python)
+                (description "The standard Python build system")
+                (build python-build)))
+
+;;; python.scm ends here
\ No newline at end of file
diff --git a/guix/build/python-build-system.scm b/guix/build/python-build-system.scm
new file mode 100644
index 0000000..1df1746
--- /dev/null
+++ b/guix/build/python-build-system.scm
@@ -0,0 +1,89 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2013 Ludovic Courtès <l...@gnu.org>
+;;; Copyright © 2013 Nikita Karetnikov <nik...@karetnikov.org>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (guix build python-build-system)
+  #:use-module ((guix build gnu-build-system)
+                #:renamer (symbol-prefix-proc 'gnu:))
+  #:use-module (guix build utils)
+  #:use-module (ice-9 match)
+  #:use-module (ice-9 ftw)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-26)
+  #:export (%standard-phases
+            python-build))
+
+;; Commentary:
+;;
+;; Builder-side code of the standard Python package build procedure.
+;;
+;; Code:
+
+(define* (install #:key outputs (configure-flags '())
+                  #:allow-other-keys)
+  "Install a given Python package."
+  (let ((out (assoc-ref outputs "out")))
+    (if (file-exists? "setup.py")
+        (let ((args `("setup.py" "install" ,(string-append "--prefix=" out)
+                      ,@configure-flags)))
+          (format #t "running 'python' with arguments ~s~%" args)
+          (zero? (apply system* "python" args)))
+        (error "no setup.py found"))))
+
+(define* (wrap #:key outputs python-version #:allow-other-keys)
+  (define (list-of-files dir)
+    (map (cut string-append dir "/" <>)
+         (or (scandir dir (lambda (f)
+                            (let ((s (stat (string-append dir "/" f))))
+                              (eq? 'regular (stat:type s)))))
+             '())))
+
+  (define bindirs
+    (append-map (match-lambda
+                 ((_ . dir)
+                  (list (string-append dir "/bin")
+                        (string-append dir "/sbin"))))
+                outputs))
+
+  (let* ((out  (assoc-ref outputs "out"))
+         (var `("PYTHONPATH" prefix
+                (,(string-append out "/lib/python"
+                                 python-version "/site-packages")))))
+    (for-each (lambda (dir)
+                (let ((files (list-of-files dir)))
+                  (for-each (cut wrap-program <> var)
+                            files)))
+              bindirs)))
+
+(define %standard-phases
+  ;; 'configure' and 'build' phases are not needed.  Everything is done during
+  ;; 'install'.
+  (alist-cons-after
+   'install 'wrap
+   wrap
+   (alist-replace 'install install
+                  (alist-delete 'configure
+                                (alist-delete 'build
+                                              gnu:%standard-phases)))))
+
+(define* (python-build #:key inputs (phases %standard-phases)
+                       #:allow-other-keys #:rest args)
+  "Build the given Python package, applying all of PHASES in order."
+  (apply gnu:gnu-build #:inputs inputs #:phases phases args))
+
+;;; python-build-system.scm ends here
\ No newline at end of file
-- 
1.7.5.4

;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013 Nikita Karetnikov <nik...@karetnikov.org>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.

(define-module (gnu packages bazaar)
  #:use-module ((guix licenses) #:select (gpl2+))
  #:use-module (guix packages)
  #:use-module (guix download)
  #:use-module (guix build-system python)
  #:use-module (guix build utils))

(define-public bazaar
  (package
    (name "bazaar")
    (version "2.5.1")
    (source
     (origin
      (method url-fetch)
      (uri (string-append "https://launchpad.net/bzr/2.5/"; version
                          "/+download/bzr-" version ".tar.gz"))
      (sha256
       (base32
        "10krjbzia2avn09p0cdlbx2wya0r5v11w5ymvyl72af5dkx4cwwn"))))
    (build-system python-build-system)
    (arguments
     `(#:tests? #f))
    (home-page "https://gnu.org/software/bazaar";)
    (synopsis "Distributed and central version control system")
    (description
     "GNU Bazaar is a distributed version control system, which supports both
central version control and distributed version control.  Developers can
organize their workspace in whichever way they want.  It is possible to work
From a command line or use a GUI application.")
    (license gpl2+)))

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