[bug#30572] [PATCH 1/7] gnu: bootstrap: Add trivial packages for bash, mkdir, tar, and xz.

[Chris Marusich <cmmarusich@gmail.com>]

* gnu/packages/bootstrap.scm (bootstrap-binary): New procedure.
  (%bootstrap-bash, %bootstrap-mkdir, %bootstrap-tar, %bootstrap-xz):
  Use it to create these new packages, and export them.
---
 gnu/packages/bootstrap.scm | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/gnu/packages/bootstrap.scm b/gnu/packages/bootstrap.scm
index 27f2053c4..fff294971 100644
--- a/gnu/packages/bootstrap.scm
+++ b/gnu/packages/bootstrap.scm
@@ -2,6 +2,7 @@
 ;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org>
 ;;; Copyright © 2014, 2015 Mark H Weaver <mhw@netris.org>
 ;;; Copyright © 2017 Efraim Flashner <efraim@flashner.co.il>
+;;; Copyright © 2018 Chris Marusich <cmmarusich@gmail.com>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -43,6 +44,10 @@
             bootstrap-guile-origin
 
             %bootstrap-guile
+            %bootstrap-bash
+            %bootstrap-mkdir
+            %bootstrap-tar
+            %bootstrap-xz
             %bootstrap-coreutils&co
             %bootstrap-binutils
             %bootstrap-gcc
@@ -345,6 +350,35 @@ $out/bin/guile --version~%"
      (home-page #f)
      (license lgpl3+))))
 
+(define (bootstrap-binary program-name)
+  (package
+    (name (string-append program-name "-bootstrap"))
+    ;; The version may differ depending on the program.
+    (version "unknown")
+    (source #f)
+    (build-system trivial-build-system)
+    (arguments
+     `(#:guile ,%bootstrap-guile
+       #:builder (let ((out (assoc-ref %outputs "out"))
+                       (program (assoc-ref %build-inputs ,program-name)))
+                   (mkdir out)
+                   (mkdir (string-append out "/bin"))
+                   (symlink program (string-append out "/bin/" ,program-name)))))
+    (inputs `((,program-name ,(search-bootstrap-binary program-name (%current-system)))))
+    (description (string-append "The bootstrap " program-name "."))
+    (synopsis (string-append "The bootstrap " program-name "."))
+    (license gpl3+)
+    (home-page #f)))
+
+;; These trivial packages provide individual binaries that are also included
+;; in %bootstrap-coreutils&co.  However, these packages are more minimal than
+;; %bootstrap-coreutils&co, and they do not require network access to build
+;; because these specific binaries are included in the Guix source tree.
+(define %bootstrap-bash (bootstrap-binary "bash"))
+(define %bootstrap-mkdir (bootstrap-binary "mkdir"))
+(define %bootstrap-tar (bootstrap-binary "tar"))
+(define %bootstrap-xz (bootstrap-binary "xz"))
+
 (define %bootstrap-coreutils&co
   (package-from-tarball "bootstrap-binaries"
                         (lambda (system)
-- 
2.15.1