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+;;; guix.scm --- Get the most recent fully evaluated commit from the build farm
+
+;; Copyright © 2018 Oleg Pykhalov <go.wigust@gmail.com>
+
+;; Emacs-Guix-Misc 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.
+;;
+;; Guix-Latest-Eval 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 Guix-Latest-Eval.
+;; If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; This file contains Guix package for development version of
+;; Guix-Latest-Eval.  To build or install, run:
+;;
+;;   guix build --file=guix.scm
+;;   guix package --install-from-file=guix.scm
+
+;;; Code:
+
+(use-modules ((guix licenses) #:prefix license:)
+             (guix build utils)
+             (guix build-system trivial)
+             (guix gexp)
+             (guix git-download)
+             (guix packages)
+             (gnu packages bash)
+             (gnu packages curl)
+             (ice-9 popen)
+             (ice-9 rdelim))
+
+(define %source-dir (dirname (current-filename)))
+
+(define (git-output . args)
+  "Execute 'git ARGS ...' command and return its output without trailing
+newspace."
+  (with-directory-excursion %source-dir
+    (let* ((port   (apply open-pipe* OPEN_READ "git" args))
+           (output (read-string port)))
+      (close-port port)
+      (string-trim-right output #\newline))))
+
+(define (current-commit)
+  (git-output "log" "-n" "1" "--pretty=format:%H"))
+
+(let ((commit (current-commit)))
+  (package
+    (name "guix-latest-eval")
+    (version (string-append "0.0.1" "-" (string-take commit 7)))
+    (source (local-file %source-dir
+                        #:recursive? #t
+                        #:select? (git-predicate %source-dir)))
+    (build-system trivial-build-system)
+    (inputs
+     `(("bash" ,bash)
+       ("curl" ,curl)))
+    (arguments
+     `(#:modules
+       ((guix build utils))
+       #:builder
+       (begin
+         (use-modules (guix build utils))
+         (copy-recursively (assoc-ref %build-inputs "source") ".")
+         (setenv "PATH" (string-append
+                         (assoc-ref %build-inputs "bash") "/bin" ":"
+                         (assoc-ref %build-inputs "curl") "/bin" ":"))
+         (substitute* "guix-latest-eval"
+           (("/bin/sh") (which "bash"))
+           (("curl") (which "curl")))
+         (let ((directory "bin"))
+           (install-file "guix-latest-eval"
+                         (string-append %output "/" directory)))
+         #t)))
+    (home-page #f)
+    (synopsis "Get the most recent fully evaluated commit from the build farm")
+    (description
+     "This package provides a Curl script to get the most recent fully
+evaluated commit from the build farm.")
+    (license license:gpl3+)))
+
+;;; guix.scm ends here