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git: Update cached checkout to the remote HEAD by default. 

Fixes <https://bugs.gnu.org/45187>.
Reported by Ricardo Wurmus <rekado@elephly.net>.

update-cached-checkout hard codes "master" as the default branch, leading to a
failure when the clone doesn't have a "master" branch.  Instead use the remote
HEAD symref as an indicator of what the primary branch is.

* guix/git.scm (resolve-reference): Support resolving symrefs.
(update-cached-checkout, latest-repository-commit): Change the default for REF
to the empty list and translate it to the remote HEAD symref.
(<git-checkout>): Change branch field's default to #f.
(git-checkout-compiler): When branch and commit fields are both #f, call
latest-repository-commit* with the empty list as the ref.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>
This commit is contained in:
Kyle Meyer 2021-04-09 23:50:13 -04:00 committed by Ludovic Courtès
parent d7e57e2a5b
commit cb41c15827
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1 changed files with 16 additions and 7 deletions
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@ -1,6 +1,7 @@
;;; GNU Guix --- Functional package management for GNU
;;; 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>
;;;
;;; This file is part of GNU Guix.
;;;
@ -209,6 +210,9 @@ corresponding Git object."
(let ((oid (reference-target
(branch-lookup repository branch BRANCH-REMOTE))))
(object-lookup repository oid)))
(('symref . symref)
(let ((oid (reference-name->oid repository symref)))
(object-lookup repository oid)))
(('commit . commit)
(let ((len (string-length commit)))
;; 'object-lookup-prefix' appeared in Guile-Git in Mar. 2018, so we
@ -340,7 +344,7 @@ definitely available in REPOSITORY, false otherwise."
(define* (update-cached-checkout url
#:key
(ref '(branch . "master"))
(ref '())
recursive?
(check-out? #t)
starting-commit
@ -356,6 +360,7 @@ provided) as returned by 'commit-relation'.
REF is pair whose key is [branch | commit | tag | tag-or-commit ] and value
the associated data: [<branch name> | <sha1> | <tag name> | <string>].
If REF is the empty list, the remote HEAD is used.
When RECURSIVE? is true, check out submodules as well, if any.
@ -374,6 +379,7 @@ it unchanged."
;; made little sense since the cache should be transparent to them. So
;; here we append "origin/" if it's missing and otherwise keep it.
(match ref
(() '(symref . "refs/remotes/origin/HEAD"))
(('branch . branch)
`(branch . ,(if (string-prefix? "origin/" branch)
branch
@ -433,12 +439,13 @@ it unchanged."
(log-port (%make-void-port "w"))
(cache-directory
(%repository-cache-directory))
(ref '(branch . "master")))
(ref '()))
"Return two values: the content of the git repository at URL copied into a
store directory and the sha1 of the top level commit in this directory. The
reference to be checkout, once the repository is fetched, is specified by REF.
REF is pair whose key is [branch | commit | tag] and value the associated
data, respectively [<branch name> | <sha1> | <tag name>].
data, respectively [<branch name> | <sha1> | <tag name>]. If REF is the empty
list, the remote HEAD is used.
When RECURSIVE? is true, check out submodules as well, if any.
@ -548,7 +555,7 @@ objects: 'ancestor (meaning that OLD is an ancestor of NEW), 'descendant, or
git-checkout make-git-checkout
git-checkout?
(url git-checkout-url)
(branch git-checkout-branch (default "master"))
(branch git-checkout-branch (default #f))
(commit git-checkout-commit (default #f)) ;#f | tag | commit
(recursive? git-checkout-recursive? (default #f)))
@ -587,9 +594,11 @@ objects: 'ancestor (meaning that OLD is an ancestor of NEW), 'descendant, or
(match checkout
(($ <git-checkout> url branch commit recursive?)
(latest-repository-commit* url
#:ref (if commit
`(tag-or-commit . ,commit)
`(branch . ,branch))
#:ref (cond (commit
`(tag-or-commit . ,commit))
(branch
`(branch . ,branch))
(else '()))
#:recursive? recursive?
#:log-port (current-error-port)))))