521d33cdc6
`hg-predicate' acts for mercurial repositories as `git-predicate' acts for git-repositories. * guix/hg-download.scm (hg-predicate): New procedure. Signed-off-by: Christopher Baines <mail@cbaines.net>
133 lines
4.9 KiB
Scheme
133 lines
4.9 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2014, 2015, 2016, 2017, 2019 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2016 Ricardo Wurmus <rekado@elephly.net>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (guix hg-download)
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#:use-module (guix gexp)
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#:use-module (guix store)
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#:use-module (guix monads)
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#:use-module (guix records)
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#:use-module (guix modules)
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#:use-module (guix packages)
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#:autoload (guix build-system gnu) (standard-packages)
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#:use-module (ice-9 match)
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#:use-module (ice-9 popen)
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#:use-module (ice-9 rdelim)
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#:export (hg-reference
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hg-reference?
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hg-reference-url
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hg-reference-changeset
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hg-reference-recursive?
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hg-predicate
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hg-fetch))
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;;; Commentary:
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;;;
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;;; An <origin> method that fetches a specific changeset from a Mercurial
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;;; repository. The repository URL and changeset ID are specified with a
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;;; <hg-reference> object.
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;;;
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;;; Code:
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(define-record-type* <hg-reference>
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hg-reference make-hg-reference
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hg-reference?
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(url hg-reference-url)
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(changeset hg-reference-changeset))
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(define (hg-package)
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"Return the default Mercurial package."
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(let ((distro (resolve-interface '(gnu packages version-control))))
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(module-ref distro 'mercurial)))
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(define* (hg-fetch ref hash-algo hash
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#:optional name
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#:key (system (%current-system)) (guile (default-guile))
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(hg (hg-package)))
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"Return a fixed-output derivation that fetches REF, a <hg-reference>
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object. The output is expected to have recursive hash HASH of type
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HASH-ALGO (a symbol). Use NAME as the file name, or a generic name if #f."
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(define guile-zlib
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(module-ref (resolve-interface '(gnu packages guile)) 'guile-zlib))
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(define modules
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(delete '(guix config)
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(source-module-closure '((guix build hg)
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(guix build download-nar)))))
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(define build
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(with-imported-modules modules
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(with-extensions (list guile-zlib)
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#~(begin
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(use-modules (guix build hg)
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(guix build download-nar))
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(or (hg-fetch '#$(hg-reference-url ref)
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'#$(hg-reference-changeset ref)
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#$output
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#:hg-command (string-append #+hg "/bin/hg"))
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(download-nar #$output))))))
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(mlet %store-monad ((guile (package->derivation guile system)))
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(gexp->derivation (or name "hg-checkout") build
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#:leaked-env-vars '("http_proxy" "https_proxy"
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"LC_ALL" "LC_MESSAGES" "LANG"
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"COLUMNS")
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#:system system
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#:local-build? #t ;don't offload repo cloning
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#:hash-algo hash-algo
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#:hash hash
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#:recursive? #t
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#:guile-for-build guile)))
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(define (hg-file-list directory)
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"Evaluates to a list of files contained in the repository at path
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@var{directory}"
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(let* ((port (open-input-pipe (format #f "hg files --repository ~s" directory)))
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(files (let loop ((files '()))
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(let ((line (read-line port)))
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(cond
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((eof-object? line) files)
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(else
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(loop (cons line files))))))))
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(close-pipe port)
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(map canonicalize-path files)))
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(define (should-select? path-list candidate)
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"Returns #t in case that @var{candidate} is a file that is part of the given
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@var{path-list}."
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(let ((canon-candidate (canonicalize-path candidate)))
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(let loop ((xs path-list))
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(cond
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((null? xs)
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;; Directories are not part of `hg files', but `local-file' will not
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;; recurse if we don't return #t for directories.
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(equal? (array-ref (lstat candidate) 13) 'directory))
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((string-contains candidate (car xs)) #t)
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(else (loop (cdr xs)))))))
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(define (hg-predicate directory)
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"This procedure evaluates to a predicate that reports back whether a given
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@var{file} - @var{stat} combination is part of the files tracked by
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Mercurial."
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(let ((files (hg-file-list directory)))
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(lambda (file stat)
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(should-select? files file))))
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;;; hg-download.scm ends here
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