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-rw-r--r--guix/git.scm18
1 files changed, 17 insertions, 1 deletions
diff --git a/guix/git.scm b/guix/git.scm
index de98fed40c..92a7353b5a 100644
--- a/guix/git.scm
+++ b/guix/git.scm
@@ -220,6 +220,21 @@ dynamic extent of EXP."
(G_ "Support for submodules is missing; \
please upgrade Guile-Git.~%"))))
+(define (reference-available? repository ref)
+ "Return true if REF, a reference such as '(commit . \"cabba9e\"), is
+definitely available in REPOSITORY, false otherwise."
+ (match ref
+ (('commit . commit)
+ (catch 'git-error
+ (lambda ()
+ (->bool (commit-lookup repository (string->oid commit))))
+ (lambda (key error . rest)
+ (if (= GIT_ENOTFOUND (git-error-code error))
+ #f
+ (apply throw key error rest)))))
+ (_
+ #f)))
+
(define* (update-cached-checkout url
#:key
(ref '(branch . "master"))
@@ -254,7 +269,8 @@ When RECURSIVE? is true, check out submodules as well, if any."
(repository-open cache-directory)
(clone* url cache-directory))))
;; Only fetch remote if it has not been cloned just before.
- (when cache-exists?
+ (when (and cache-exists?
+ (not (reference-available? repository ref)))
(remote-fetch (remote-lookup repository "origin")))
(when recursive?
(update-submodules repository #:log-port log-port))