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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2025 Nguyễn Gia Phong <cnx@loang.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/>.
;;;
;;; Commentary:
;;;
;;; This is the build-side support code of (guix fossil-download).
;;; It allows a Fossil repository to be opened at a specific revision.
;;;
;;; Code:
(define-module (guix build fossil)
#:use-module (guix build utils)
#:use-module (ice-9 match)
#:use-module (srfi srfi-26)
#:use-module (srfi srfi-34)
#:use-module (srfi srfi-35)
#:use-module (web uri)
#:export (fossil-fetch))
(define* (fossil-fetch uri check-in file #:key (fossil-command "fossil"))
"Fetch CHECK-IN from URI into DIRECTORY. CHECK-IN must be a valid
Fossil check-in name. Return #t on success, else raise an exception."
(setenv "FOSSIL_HOME" "/tmp")
(invoke fossil-command
"tarball" check-in file "-R"
(case (uri-scheme (string->uri-reference uri))
((file https) ;clone the repository first
(match-let ((repository (simple-format #f "/tmp/~a.fossil"
(basename file ".tar.gz")))
((input . output) (pipe)))
;; Trust the TLS certificate of the server,
;; since we'll later verify the tarball's checksum.
(display "y" output)
(close-port output)
(with-input-from-port input
(cut invoke fossil-command "clone"
"--no-open" "--once" uri repository))
(close-port input)
repository))
((ssh) ;TODO: authentication for SSH
(let ((message (string-append "fetching a Fossil repository through SSH"
" is not supported: " uri)))
(raise (condition (&message (message message))))))
((#f) uri)))) ;local file
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