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git: Remove untracked files from cached checkouts.

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Cached checkouts could end up with stale untracked files, for example
because the checkout was interrupted.  As a result, when this happens
for the Guix checkout, users would not get substitutes for ‘guix pull’.

* guix/git.scm (delete-untracked-files): New procedure.
(switch-to-ref): Use it.
* tests/git.scm ("update-cached-checkout, untracked files removed"): New
test.

Co-authored-by: Ricardo Wurmus <rekado@elephly.net>
Change-Id: Iccbe644ade396ad27a037db7e0ef1c2a68ef91ce
This commit is contained in:
Ludovic Courtès
2024-07-02 14:52:07 +02:00
parent fcd3c5d3aa
commit 58e268c2e3
2 changed files with 45 additions and 1 deletions
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22
tests/git.scm
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@@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2019, 2020, 2022 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2019-2020, 2022, 2024 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2021 Xinglu Chen <public@yoctocell.xyz
;;;
;;; This file is part of GNU Guix.
@@ -259,4 +259,24 @@
;; COMMIT should be the ID of the commit object, not that of the tag.
(string=? commit head))))))
(test-assert "update-cached-checkout, untracked files removed"
(call-with-temporary-directory
(lambda (cache)
(with-temporary-git-repository directory
'((add "a.txt" "A")
(add ".gitignore" ".~\n")
(commit "First commit"))
(let ((directory commit relation
(update-cached-checkout directory
#:ref '()
#:cache-directory cache)))
(close-port
(open-output-file (in-vicinity cache "stale-untracked-file")))
(let ((directory2 commit2 relation2
(update-cached-checkout directory
#:ref '()
#:cache-directory cache)))
(not (file-exists?
(in-vicinity cache "stale-untracked-file")))))))))
(test-end "git")