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authorLudovic Courtès <ludo@gnu.org>2019-07-26 10:59:24 +0200
committerLudovic Courtès <ludo@gnu.org>2019-07-26 11:21:36 +0200
commitc4c2449fea9b7fd78f61ffb9bbe19ab2ef6c8b41 (patch)
treeb66a54f4aa81cf447bd0b9ae272ae8a55ad31249
parent422e187fb48d8c5f9c3f61457cdfaf47f473b1ee (diff)
git: 'update-cached-checkout' supports a 'tag-or-commit' type of ref.
* guix/git.scm (switch-to-ref)[obj]: Wrap in 'resolve' lambda. Add 'tag-or-commit' case. (update-cached-checkout): Document it.
-rw-r--r--guix/git.scm61
1 files changed, 36 insertions, 25 deletions
diff --git a/guix/git.scm b/guix/git.scm
index 289537dedf..fb2df2de07 100644
--- a/guix/git.scm
+++ b/guix/git.scm
@@ -139,29 +139,40 @@ of SHA1 string."
"Switch to REPOSITORY's branch, commit or tag specified by REF. Return the
OID (roughly the commit hash) corresponding to REF."
(define obj
- (match ref
- (('branch . branch)
- (let ((oid (reference-target
- (branch-lookup repository branch BRANCH-REMOTE))))
- (object-lookup repository oid)))
- (('commit . commit)
- (let ((len (string-length commit)))
- ;; 'object-lookup-prefix' appeared in Guile-Git in Mar. 2018, so we
- ;; can't be sure it's available. Furthermore, 'string->oid' used to
- ;; read out-of-bounds when passed a string shorter than 40 chars,
- ;; which is why we delay calls to it below.
- (if (< len 40)
- (if (module-defined? (resolve-interface '(git object))
- 'object-lookup-prefix)
- (object-lookup-prefix repository (string->oid commit) len)
- (raise (condition
- (&message
- (message "long Git object ID is required")))))
- (object-lookup repository (string->oid commit)))))
- (('tag . tag)
- (let ((oid (reference-name->oid repository
- (string-append "refs/tags/" tag))))
- (object-lookup repository oid)))))
+ (let resolve ((ref ref))
+ (match ref
+ (('branch . branch)
+ (let ((oid (reference-target
+ (branch-lookup repository branch BRANCH-REMOTE))))
+ (object-lookup repository oid)))
+ (('commit . commit)
+ (let ((len (string-length commit)))
+ ;; 'object-lookup-prefix' appeared in Guile-Git in Mar. 2018, so we
+ ;; can't be sure it's available. Furthermore, 'string->oid' used to
+ ;; read out-of-bounds when passed a string shorter than 40 chars,
+ ;; which is why we delay calls to it below.
+ (if (< len 40)
+ (if (module-defined? (resolve-interface '(git object))
+ 'object-lookup-prefix)
+ (object-lookup-prefix repository (string->oid commit) len)
+ (raise (condition
+ (&message
+ (message "long Git object ID is required")))))
+ (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))))))
+ (('tag . tag)
+ (let ((oid (reference-name->oid repository
+ (string-append "refs/tags/" tag))))
+ (object-lookup repository oid))))))
(reset repository obj RESET_HARD)
(object-id obj))
@@ -218,8 +229,8 @@ please upgrade Guile-Git.~%"))))
values: the cache directory name, and the SHA1 commit (a string) corresponding
to REF.
-REF is pair whose key is [branch | commit | tag] and value the associated
-data, respectively [<branch name> | <sha1> | <tag name>].
+REF is pair whose key is [branch | commit | tag | tag-or-commit ] and value
+the associated data: [<branch name> | <sha1> | <tag name> | <string>].
When RECURSIVE? is true, check out submodules as well, if any."
(define canonical-ref