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+;;; guix-forge --- Guix software forge meta-service
+;;; Copyright © 2022 Arun Isaac <arunisaac@systemreboot.net>
+;;;
+;;; This file is part of guix-forge.
+;;;
+;;; guix-forge 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-forge 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-forge. If not, see
+;;; <https://www.gnu.org/licenses/>.
+
+(define-module (forge build git)
+ #:use-module (rnrs exceptions)
+ #:use-module (guix build utils)
+ #:use-module (guix store)
+ #:use-module (guix utils)
+ #:export (download-git-to-store
+ latest-git-checkout))
+
+;;;
+;;; Commentary:
+;;;
+;;; This module provides build-side code to download a git repository
+;;; to the store.
+;;;
+
+;;; Code:
+
+(define (hline)
+ "Print a horizontal line 50 '=' characters long."
+ (display (make-string 50 #\=))
+ (newline)
+ (force-output))
+
+(define* (download-git-to-store store name url #:key branch show-commit?)
+ "Download BRANCH of git repository from URL to STORE under NAME and
+return store path. If BRANCH is not specified, the default branch is
+downloaded. git and certificates should be in the environment."
+ (call-with-temporary-directory
+ (lambda (directory)
+ (with-directory-excursion directory
+ (guard (condition ((invoke-error? condition)
+ (format (current-error-port)
+ "'~a~{ ~a~}' failed with exit code ~a~%"
+ (invoke-error-program condition)
+ (invoke-error-arguments condition)
+ (invoke-error-exit-status condition))
+ (exit #f)))
+ (apply invoke
+ "git" "clone" "--quiet" "--depth" "1"
+ ;; Append file:// to local repository path so that
+ ;; shallow clone works.
+ (if (string-prefix? "/" url)
+ (string-append "file://" url)
+ url)
+ (append (if branch
+ (list "--branch" branch)
+ (list))
+ (list "."))))
+ (when show-commit?
+ (hline)
+ (invoke "git" "--no-pager" "log")
+ (hline))
+ (delete-file-recursively ".git"))
+ (add-to-store store name #t "sha256" directory))))
+
+(define latest-git-checkout
+ (store-lift download-git-to-store))