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-rw-r--r--guix/build/git.scm44
1 files changed, 42 insertions, 2 deletions
diff --git a/guix/build/git.scm b/guix/build/git.scm
index deda10fee8..0ff263c81b 100644
--- a/guix/build/git.scm
+++ b/guix/build/git.scm
@@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2014, 2016, 2019 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2014, 2016, 2019, 2023 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
@@ -18,9 +18,12 @@
(define-module (guix build git)
#:use-module (guix build utils)
+ #:autoload (guix build download-nar) (download-nar)
+ #:autoload (guix swh) (%verify-swh-certificate? swh-download)
#:use-module (srfi srfi-34)
#:use-module (ice-9 format)
- #:export (git-fetch))
+ #:export (git-fetch
+ git-fetch-with-fallback))
;;; Commentary:
;;;
@@ -76,4 +79,41 @@ recursively. Return #t on success, #f otherwise."
(delete-file-recursively ".git")
#t)))
+
+(define* (git-fetch-with-fallback url commit directory
+ #:key (git-command "git") recursive?)
+ "Like 'git-fetch', fetch COMMIT from URL into DIRECTORY, but fall back to
+alternative methods when fetching from URL fails: attempt to download a nar,
+and if that also fails, download from the Software Heritage archive."
+ (or (git-fetch url commit directory
+ #:recursive? recursive?
+ #:git-command git-command)
+ (download-nar directory)
+
+ ;; 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 url commit directory)
+ (when (file-exists?
+ (string-append directory "/.gitattributes"))
+ ;; Perform CR/LF conversion and other changes
+ ;; specificied by '.gitattributes'.
+ (invoke git-command "-C" directory "init")
+ (invoke git-command "-C" directory "config" "--local"
+ "user.email" "you@example.org")
+ (invoke git-command "-C" directory "config" "--local"
+ "user.name" "Your Name")
+ (invoke git-command "-C" directory "add" ".")
+ (invoke git-command "-C" directory "commit" "-am" "init")
+ (invoke git-command "-C" directory "read-tree" "--empty")
+ (invoke git-command "-C" directory "reset" "--hard")
+ (delete-file-recursively
+ (string-append directory "/.git")))))))
+
;;; git.scm ends here