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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
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GPG Key ID: 090B11993D9AEBB5
2 changed files with 45 additions and 1 deletions
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24
guix/git.scm
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@ -298,6 +298,25 @@ corresponding Git object."
(('tag . tag)
(tag->commit repository tag)))))
(define (delete-untracked-files repository)
"Delete untracked files from the work directory of REPOSITORY."
(let ((workdir (repository-working-directory repository))
(status (status-list-new repository
(make-status-options
STATUS-SHOW-WORKDIR-ONLY
(logior
STATUS-FLAG-INCLUDE-UNTRACKED
STATUS-FLAG-INCLUDE-IGNORED)))))
(for-each (lambda (entry)
(let ((status (status-entry-status entry)))
(when (or (memq 'wt-new status)
(memq 'ignored status))
(let* ((diff (status-entry-index-to-workdir entry))
(new (diff-delta-new-file diff)))
(delete-file-recursively
(in-vicinity workdir (diff-file-path new)))))))
(status-list->status-entries status))))
(define (switch-to-ref repository ref)
"Switch to REPOSITORY's branch, commit or tag specified by REF. Return the
OID (roughly the commit hash) corresponding to REF."
@ -305,6 +324,11 @@ OID (roughly the commit hash) corresponding to REF."
(resolve-reference repository ref))
(reset repository obj RESET_HARD)
;; There might still be untracked files in REPOSITORY due to an interrupted
;; checkout for example; delete them.
(delete-untracked-files repository)
(object-id obj))
(define (call-with-repository directory proc)

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")