;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2012, 2013, 2014 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2014, 2015 Mark H Weaver <mhw@netris.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 bash)
  #:use-module (guix licenses)
  #:use-module (gnu packages ncurses)
  #:use-module (gnu packages readline)
  #:use-module (gnu packages bison)
  #:use-module (guix packages)
  #:use-module (guix download)
  #:use-module (guix utils)
  #:use-module (guix build-system gnu)
  #:autoload   (guix gnupg) (gnupg-verify*)
  #:autoload   (guix hash) (port-sha256)
  #:autoload   (guix base32) (bytevector->nix-base32-string)
  #:use-module (srfi srfi-1)
  #:use-module (srfi srfi-26)
  #:use-module (ice-9 format))

(define (patch-url seqno)
  "Return the URL of Bash patch number SEQNO."
  (format #f "mirror://gnu/bash/bash-4.3-patches/bash43-~3,'0d" seqno))

(define (bash-patch seqno sha256)
  "Return the origin of Bash patch SEQNO, with expected hash SHA256"
  (origin
    (method url-fetch)
    (uri (patch-url seqno))
    (sha256 sha256)))

(define-syntax-rule (patch-series (seqno hash) ...)
  (list (bash-patch seqno (base32 hash))
        ...))

(define %patch-series-4.3
  ;; This is the current patches series for 4.3, generated using
  ;; 'download-patches' below.
  (patch-series
   (1 "0hip2n2s5hws8p4nfcz37379zn6cak83ljsm64z52rw6ckrdzczc")
   (2 "0ashj5d1g3zbyr7zf0r72s5wnk96cz1xj919y3jajadbc9qcvrzf")
   (3 "0z88q4daq7dmw93iqd9c5i5d1sndklih3nrh0v75746da2n6w3h0")
   (4 "0f0kh9j5k4ym6knshscx31przm50x5cc7ifkwqk0swh6clna982y")
   (5 "1ym3b8b7lgmdp3dklp8qaqhyq965wd5392namq8mz7rb0d231j0s")
   (6 "04q20igq49py49ynb0f83f6f52cdkyqwd9bpic6akr0m5pkqwr50")
   (7 "18zkz23d9myshrwfcwcdjk7qmkqp8az5n91ni9jaixlwqlhy64qi")
   (8 "0pprcwvh7ngdli0x95pc1cpssg4qg7layi9xrv2jq6c7965ajhcr")
   (9 "19a0pf0alp30d1bjj0zf3zq2f5n0s6y91w7brm9jyswl51kns8n0")
   (10 "1dzhr5ammyijisz48cqi5vaw26hfr5vh9smnqxq4qc9p06f7j1ff")
   (11 "0fvzdzzi142a8rf3v965r6gbpn0k7fv2gif1yq8a4160vcn40qvw")
   (12 "04lcgfcyz7p3zagb4hkia3hkpd7lii9m8ycy9qqwzyrm1c1pj4ry")
   (13 "0y9cqi378z6flapkd5k5lfl4lq3ivzg4njj3i3wmw7xb6r9wma5z")
   (14 "04xcb0k9fxxq4vashgzb98567xzdnm4655nlm4jvfvjv6si6ykas")
   (15 "13ay6lldy1p00xj41nfjpq8lai3vw2qwca79gx6s80z04j53wa8k")
   (16 "0wq7bvx3pfw90pnfb86yg5nr9jgjsvm2nq5rrkqxf6zn977hpmlj")
   (17 "103p7sibihv6cshqj12k546zsbz0dnd5cv5vlx1719avddfc4rqj")
   (18 "0n1x3812y1brb9xbabaj3fvr4cpvm2225iwckmqk2fcpkq5b9a3s")
   (19 "08rd1p7zpzgbpmmmnj2im8wj2pcwmbbx51psr9vdc5c049si9ad7")
   (20 "163c6g05qpag2plx5q795pmw3f3m904jy7z93xj2i08pgzc8cpna")
   (21 "1a90cl3h10dh8k9f2ddrsjmw5ywaw2d5x78xb4fd2sryi039yhs1")
   (22 "120s0s4qcqd0q12j1iv0hkpf9fp3w5jnqw646kv66n66jnxlfkgx")
   (23 "1m00sfi88p2akgiyrg4hw0gvz3s1586pkzjdr3dm73vs773m1hls")
   (24 "0v0gjqzjsqjfgj5x17fq7g649k94jn8zq92qsxkhc2d6l215hl1v")
   (25 "0lcj96i659q35f1jcmwwbnw3p7w7vvlxjxqi989vn6d6qksqcl8y") ;CVE-2014-6271
   (26 "0k919ir0inwn4wai2vdzpbwqq5h54fnrlkmgccxjg91v3ch15k1f") ;CVE-2014-7169
   (27 "1gnsfvq6bhb3srlbh0cannj2hackdsipcg7z0ds7zlk1hp96mdqy")
   (28 "17a65c4fn4c5rgsiw9gqqnzhznh3gwnd2xzzv2dppyi48znxpc78") ;CVE-2014-7186
   (29 "14k27p28r5l2fz3r03kd0x72vvsq8bja8c6hjz5kxikbzsbs7i2c") ;CVE-2014-6277
   (30 "0nrqb0m7s89qsrbfaffpilc5gcf82bx9yvgzld4hr79p5y54yhw5") ;CVE-2014-6278
   (31 "07d62bl3z7qa8v6kgk47vzzazw563mlk9zhrsr4xsbqgvmcrylnd")
   (32 "0jjgapfq4qhmndfrw8c3q3lva8xjdhlbd9cc631v41b0kb95g4w8")
   (33 "05ma5rlxiadnfh925p4y7s0vvk917kmsdb1mfdx05gizl63pfapv")))
(define (download-patches store count)
  "Download COUNT Bash patches into store.  Return a list of
number/base32-hash tuples, directly usable in the 'patch-series' form."
  (unfold (cut > <> count)
          (lambda (number)
            (let* ((patch  (download-to-store store (patch-url number)))
                   (sig    (download-to-store store
                                              (string-append (patch-url number)
                                                             ".sig"))))
              (unless (gnupg-verify* sig patch)
                (error "failed to verify signature" patch))

              (list number
                    (bytevector->nix-base32-string
                     (call-with-input-file patch port-sha256)))))
          1+
          1))

(define-public bash
  (let* ((cppflags (string-join '("-DSYS_BASHRC='\"/etc/bashrc\"'"
                                  "-DSYS_BASH_LOGOUT='\"/etc/bash_logout\"'"
                                  "-DDEFAULT_PATH_VALUE='\"/no-such-path\"'"
                                  "-DSTANDARD_UTILS_PATH='\"/no-such-path\"'"
                                  "-DNON_INTERACTIVE_LOGIN_SHELLS"
                                  "-DSSH_SOURCE_BASHRC")
                                " "))
         (configure-flags
          ``("--with-installed-readline"
             ,,(string-append "CPPFLAGS=" cppflags)
             ,(string-append
               "LDFLAGS=-Wl,-rpath -Wl,"
               (assoc-ref %build-inputs "readline")
               "/lib"
               " -Wl,-rpath -Wl,"
               (assoc-ref %build-inputs "ncurses")
               "/lib")))
         (post-install-phase
          '(lambda* (#:key outputs #:allow-other-keys)
             ;; Add a `bash' -> `sh' link.
             (let ((out (assoc-ref outputs "out")))
               (with-directory-excursion (string-append out "/bin")
                 (symlink "bash" "sh")))))
         (version "4.3"))
    (package
     (name "bash")
     (source (origin
              (method url-fetch)
              (uri (string-append
                    "mirror://gnu/bash/bash-" version ".tar.gz"))
              (sha256
               (base32
                "1m14s1f61mf6bijfibcjm9y6pkyvz6gibyl8p4hxq90fisi8gimg"))
              (patch-flags '("-p0"))
              (patches %patch-series-4.3)

              ;; The patches above modify 'parse.y', so force a rebuild of the
              ;; parser.
              (snippet '(for-each delete-file
                                  '("y.tab.c" "y.tab.h" "parser-built")))))
     (version (string-append version "."
                             (number->string (length %patch-series-4.3))))
     (build-system gnu-build-system)
     (native-inputs `(("bison" ,bison)))          ;to rebuild the parser
     (inputs `(("readline" ,readline)
               ("ncurses" ,ncurses)))             ;TODO: add texinfo
     (arguments
      `(;; When cross-compiling, `configure' incorrectly guesses that job
        ;; control is missing.
        #:configure-flags ,(if (%current-target-system)
                               `(cons* "bash_cv_job_control_missing=no"
                                       ,configure-flags)
                               configure-flags)

        ;; Bash is reportedly not parallel-safe.  See, for instance,
        ;; <http://patches.openembedded.org/patch/32745/> and
        ;; <http://git.buildroot.net/buildroot/commit/?h=79e2d802ae7e376a413c02097790493e1f65c3a4>.
        #:parallel-build? #f
        #:parallel-tests? #f

        ;; XXX: The tests have a lot of hard-coded paths, so disable them
        ;; for now.
        #:tests? #f

        #:phases (alist-cons-after 'install 'post-install
                                   ,post-install-phase
                                   %standard-phases)))
     (synopsis "The GNU Bourne-Again SHell")
     (description
      "Bash is the shell, or command-line interpreter, of the GNU system.  It
is compatible with the Bourne Shell, but it also integrates useful features
from the Korn Shell and the C Shell and new improvements of its own.  It
allows command-line editing, unlimited command history, shell functions and
aliases, and job control while still allowing most sh scripts to be run
without modification.")
     (license gpl3+)
     (home-page "http://www.gnu.org/software/bash/"))))

(define-public bash-light
  ;; A stripped-down Bash for non-interactive use.
  (package (inherit bash)
    (name "bash-light")
    (inputs '())                                ; no readline, no curses
    (arguments
     (let ((args `(#:modules ((guix build gnu-build-system)
                              (guix build utils)
                              (srfi srfi-1)
                              (srfi srfi-26))
                   ,@(package-arguments bash))))
       (substitute-keyword-arguments args
         ((#:configure-flags flags)
          `(list "--without-bash-malloc"
                 "--disable-readline"
                 "--disable-history"
                 "--disable-help-builtin"
                 "--disable-progcomp"
                 "--disable-net-redirections"
                 "--disable-nls"

                 ,@(if (%current-target-system)
                       '("bash_cv_job_control_missing=no")
                       '()))))))))
