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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2014, 2015, 2016, 2017, 2018, 2019 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2017 Mathieu Lirzin <mthl@gnu.org>
;;; Copyright © 2017 Christopher Baines <mail@cbaines.net>
;;; Copyright © 2020 Jakub Kądziołka <kuba@kadziolka.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 gexp)
#:use-module (guix store)
#:use-module (guix monads)
#:use-module (guix records)
#:use-module (guix packages)
#:use-module (guix modules)
#:autoload (guix build-system gnu) (standard-packages)
#:use-module (git)
#:use-module (ice-9 match)
#:use-module (ice-9 vlist)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-34)
#:use-module (srfi srfi-35)
#: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-minimal)))
(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)
;; The 'swh-download' procedure requires tar and gzip.
`(("gzip" ,(module-ref (resolve-interface '(gnu packages compression))
'gzip))
("tar" ,(module-ref (resolve-interface '(gnu packages base))
'tar)))))
(define zlib
(module-ref (resolve-interface '(gnu packages compression)) 'zlib))
(define guile-json
(module-ref (resolve-interface '(gnu packages guile)) 'guile-json-3))
(define gnutls
(module-ref (resolve-interface '(gnu packages tls)) 'gnutls))
(define config.scm
(scheme-file "config.scm"
#~(begin
(define-module (guix config)
#:export (%libz))
(define %libz
#+(file-append zlib "/lib/libz")))))
(define modules
(cons `((guix config) => ,config.scm)
(delete '(guix config)
(source-module-closure '((guix build git)
(guix build utils)
(guix build download-nar)
(guix swh))))))
(define build
(with-imported-modules modules
(with-extensions (list guile-json gnutls) ;for (guix swh)
#~(begin
(use-modules (guix build git)
(guix build utils)
(guix build download-nar)
(guix swh)
(ice-9 match))
(define recursive?
(call-with-input-string (getenv "git recursive?") read))
;; The 'git submodule' commands expects Coreutils, sed,
;; grep, etc. to be in $PATH.
(set-path-environment-variable "PATH" '("bin")
(match '#+inputs
(((names dirs outputs ...) ...)
dirs)))
(setvbuf (current-output-port) 'line)
(setvbuf (current-error-port) 'line)
(or (git-fetch (getenv "git url") (getenv "git commit")
#$output
#:recursive? recursive?
#:git-command (string-append #+git "/bin/git"))
(download-nar #$output)
;; As a last resort, attempt to download from Software Heritage.
;; Disable X.509 certificate verification to avoid depending
;; on nss-certs--we're authenticating the checkout anyway.
;; XXX: Currently recursive checkouts are not supported.
(and (not recursive?)
(parameterize ((%verify-swh-certificate? #f))
(format (current-error-port)
"Trying to download from Software Heritage...~%")
(swh-download (getenv "git url") (getenv "git commit")
#$output))))))))
(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))))
#:leaked-env-vars '("http_proxy" "https_proxy"
"LC_ALL" "LC_MESSAGES" "LANG"
"COLUMNS")
#: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."
;; git-version is almost exclusively executed while modules are being loaded.
;; This makes any errors hide their backtrace. Avoid the mysterious error
;; "Value out of range 0 to N: 7" when the commit ID is too short, which
;; can happen, for example, when the user swapped the revision and commit
;; arguments by mistake.
(when (< (string-length commit) 7)
(raise
(condition
(&message (message "git-version: commit ID unexpectedly short")))))
(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 (git-file-list directory)
"Return the list of files checked in in the Git repository at DIRECTORY.
The result is similar to that of the 'git ls-files' command, except that it
also includes directories, not just regular files. The returned file names
are relative to DIRECTORY, which is not necessarily the root of the checkout."
(let* (;; 'repository-working-directory' always returns a trailing "/",
;; so add one here to ease the comparisons below.
(directory (string-append (canonicalize-path directory) "/"))
(dot-git (repository-discover directory))
(repository (repository-open dot-git))
(workdir (repository-working-directory repository))
(head (repository-head repository))
(oid (reference-target head))
(commit (commit-lookup repository oid))
(tree (commit-tree commit))
(files (tree-list tree)))
(repository-close! repository)
(if (string=? workdir directory)
files
(let ((relative (string-drop directory (string-length workdir))))
(filter-map (lambda (file)
(and (string-prefix? relative file)
(string-drop file (string-length relative))))
files)))))
(define (git-predicate directory)
"Return a predicate that returns true if a file is part of the Git checkout
living at DIRECTORY. If DIRECTORY does not lie within a Git checkout, and
upon Git errors, 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'."
(catch 'git-error
(lambda ()
(let* ((files (git-file-list directory))
(inodes (fold (lambda (file result)
(let ((stat
(lstat (string-append directory "/"
file))))
(vhash-consv (stat:ino stat) (stat:dev stat)
result)))
vlist-null
files)))
(lambda (file stat)
;; 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)))))
(const #f)))
;;; git-download.scm ends here