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git: 'resolve-reference' handles 'git describe'-style commit IDs.

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* guix/git.scm (resolve-reference): Rewrite tag-or-commit case to recognize
'git describe' style identifiers and resolve them as commits.
* doc/guix.texi (origin Reference): Mention it.
This commit is contained in:
Marius Bakke 2021-09-06 00:21:51 +02:00
parent 47d3585e96
commit 1dc3825e99
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2 changed files with 29 additions and 13 deletions
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9
doc/guix.texi
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@ -47,7 +47,7 @@ Copyright @copyright{} 2017, 2018 Carlo Zancanaro@*
Copyright @copyright{} 2017 Thomas Danckaert@*
Copyright @copyright{} 2017 humanitiesNerd@*
Copyright @copyright{} 2017, 2021 Christine Lemmer-Webber@*
Copyright @copyright{} 2017, 2018, 2019, 2020 Marius Bakke@*
Copyright @copyright{} 2017, 2018, 2019, 2020, 2021 Marius Bakke@*
Copyright @copyright{} 2017, 2019, 2020 Hartmut Goebel@*
Copyright @copyright{} 2017, 2019, 2020, 2021 Maxim Cournoyer@*
Copyright @copyright{} 2017, 2018, 2019, 2020, 2021 Tobias Geerinckx-Rice@*
@ -7010,9 +7010,10 @@ retrieve.
The URL of the Git repository to clone.
@item @code{commit}
This string denotes either the commit to fetch (a hexadecimal string,
either the full SHA1 commit or a ``short'' commit string; the latter is
not recommended) or the tag to fetch.
This string denotes either the commit to fetch (a hexadecimal string),
or the tag to fetch. You can also use a ``short'' commit ID or a
@command{git describe} style identifier such as
@code{v1.0.1-10-g58d7909c97}.
@item @code{recursive?} (default: @code{#f})
This Boolean indicates whether to recursively fetch Git sub-modules.

33
guix/git.scm
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@ -2,6 +2,7 @@
;;; Copyright © 2017, 2020 Mathieu Othacehe <m.othacehe@gmail.com>
;;; Copyright © 2018, 2019, 2020, 2021 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2021 Kyle Meyer <kyle@kyleam.com>
;;; Copyright © 2021 Marius Bakke <marius@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
@ -223,15 +224,29 @@ (define (resolve-reference repository ref)
(object-lookup-prefix repository (string->oid commit) len)
(object-lookup repository (string->oid commit)))))
(('tag-or-commit . str)
(if (or (> (string-length str) 40)
(not (string-every char-set:hex-digit str)))
(resolve `(tag . ,str)) ;definitely a tag
(catch 'git-error
(lambda ()
(resolve `(tag . ,str)))
(lambda _
;; There's no such tag, so it must be a commit ID.
(resolve `(commit . ,str))))))
(cond ((and (string-contains str "-g")
(match (string-split str #\-)
((version ... revision g+commit)
(if (and (> (string-length g+commit) 4)
(string-every char-set:digit revision)
(string-every char-set:hex-digit
(string-drop g+commit 1)))
(string-drop g+commit 1)
#f))
(_ #f)))
;; Looks like a 'git describe' style ID, like
;; v1.3.0-7-gaa34d4d28d.
=> (lambda (commit) (resolve `(commit . ,commit))))
((or (> (string-length str) 40)
(not (string-every char-set:hex-digit str)))
(resolve `(tag . ,str))) ;definitely a tag
(else
(catch 'git-error
(lambda ()
(resolve `(tag . ,str)))
(lambda _
;; There's no such tag, so it must be a commit ID.
(resolve `(commit . ,str)))))))
(('tag . tag)
(let ((oid (reference-name->oid repository
(string-append "refs/tags/" tag))))