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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2014, 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2017 Mathieu Lirzin <mthl@gnu.org>
;;; Copyright © 2017 Christopher Baines <mail@cbaines.net>
;;;
;;; 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 git-download)
#:use-module (guix build utils)
#:use-module (guix gexp)
#:use-module (guix store)
#:use-module (guix monads)
#:use-module (guix records)
#:use-module (guix packages)
#:autoload (guix build-system gnu) (standard-packages)
#:use-module (ice-9 match)
#:use-module (ice-9 popen)
#:use-module (ice-9 rdelim)
#:use-module (ice-9 vlist)
#:use-module (srfi srfi-1)
#:export (git-reference
git-reference?
git-reference-url
git-reference-commit
git-reference-recursive?
git-fetch
git-version
git-file-name
git-predicate))
;;; Commentary:
;;;
;;; An <origin> method that fetches a specific commit from a Git repository.
;;; The repository URL and commit hash are specified with a <git-reference>
;;; object.
;;;
;;; Code:
(define-record-type* <git-reference>
git-reference make-git-reference
git-reference?
(url git-reference-url)
(commit git-reference-commit)
(recursive? git-reference-recursive? ; whether to recurse into sub-modules
(default #f)))
(define (git-package)
"Return the default Git package."
(let ((distro (resolve-interface '(gnu packages version-control))))
(module-ref distro 'git)))
(define* (git-fetch ref hash-algo hash
#:optional name
#:key (system (%current-system)) (guile (default-guile))
(git (git-package)))
"Return a fixed-output derivation that fetches REF, a <git-reference>
object. The output is expected to have recursive hash HASH of type
HASH-ALGO (a symbol). Use NAME as the file name, or a generic name if #f."
(define inputs
;; When doing 'git clone --recursive', we need sed, grep, etc. to be
;; available so that 'git submodule' works.
(if (git-reference-recursive? ref)
(standard-packages)
'()))
(define build
(with-imported-modules '((guix build git)
(guix build utils))
#~(begin
(use-modules (guix build git)
(guix build utils)
(ice-9 match))
;; The 'git submodule' commands expects Coreutils, sed,
;; grep, etc. to be in $PATH.
(set-path-environment-variable "PATH" '("bin")
(match '#+inputs
(((names dirs) ...)
dirs)))
(git-fetch (getenv "git url") (getenv "git commit")
#$output
#:recursive? (call-with-input-string
(getenv "git recursive?")
read)
#:git-command (string-append #+git "/bin/git")))))
(mlet %store-monad ((guile (package->derivation guile system)))
(gexp->derivation (or name "git-checkout") build
;; Use environment variables and a fixed script name so
;; there's only one script in store for all the
;; downloads.
#:script-name "git-download"
#:env-vars
`(("git url" . ,(git-reference-url ref))
("git commit" . ,(git-reference-commit ref))
("git recursive?" . ,(object->string
(git-reference-recursive? ref))))
#:system system
#:local-build? #t ;don't offload repo cloning
#:hash-algo hash-algo
#:hash hash
#:recursive? #t
#:guile-for-build guile)))
(define (git-version version revision commit)
"Return the version string for packages using git-download."
(string-append version "-" revision "." (string-take commit 7)))
(define (git-file-name name version)
"Return the file-name for packages using git-download."
(string-append name "-" version "-checkout"))
;;;
;;; 'git-predicate'.
;;;
(define (files->directory-tree files)
"Return a tree of vhashes representing the directory listed in FILES, a list
like '(\"a/b\" \"b/c/d\")."
(fold (lambda (file result)
(let loop ((file (string-split file #\/))
(result result))
(match file
((_)
result)
((directory children ...)
(match (vhash-assoc directory result)
(#f
(vhash-cons directory (loop children vlist-null)
result))
((_ . previous)
;; XXX: 'vhash-delete' is O(n).
(vhash-cons directory (loop children previous)
(vhash-delete directory result)))))
(()
result))))
vlist-null
files))
(define (directory-in-tree? tree directory)
"Return true if DIRECTORY, a string like \"a/b\", denotes a directory listed
in TREE."
(let loop ((directory (string-split directory #\/))
(tree tree))
(match directory
(()
#t)
((head . tail)
(match (vhash-assoc head tree)
((_ . sub-tree) (loop tail sub-tree))
(#f #f))))))
(define (git-predicate directory)
"Return a predicate that returns true if a file is part of the Git checkout
living at DIRECTORY. Upon Git failure, return #f instead of a predicate.
The returned predicate takes two arguments FILE and STAT where FILE is an
absolute file name and STAT is the result of 'lstat'."
(let* ((pipe (with-directory-excursion directory
(open-pipe* OPEN_READ "git" "ls-files")))
(files (let loop ((lines '()))
(match (read-line pipe)
((? eof-object?)
(reverse lines))
(line
(loop (cons line lines))))))
(directory-tree (files->directory-tree files))
(inodes (fold (lambda (file result)
(let ((stat
(lstat (string-append directory "/"
file))))
(vhash-consv (stat:ino stat) (stat:dev stat)
result)))
vlist-null
files))
;; Note: For this to work we must *not* call 'canonicalize-path' on
;; DIRECTORY or we would get discrepancies of the returned lambda is
;; called with a non-canonical file name.
(prefix-length (+ 1 (string-length directory)))
(status (close-pipe pipe)))
(and (zero? status)
(lambda (file stat)
(match (stat:type stat)
('directory
(directory-in-tree? directory-tree
(string-drop file prefix-length)))
((or 'regular 'symlink)
;; Comparing file names is always tricky business so we rely on
;; inode numbers instead
(match (vhash-assv (stat:ino stat) inodes)
((_ . dev) (= dev (stat:dev stat)))
(#f #f)))
(_
#f))))))
;;; git-download.scm ends here
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