diff options
Diffstat (limited to 'guix/git.scm')
-rw-r--r-- | guix/git.scm | 38 |
1 files changed, 33 insertions, 5 deletions
diff --git a/guix/git.scm b/guix/git.scm index 92121156cf..ab3b5075b1 100644 --- a/guix/git.scm +++ b/guix/git.scm @@ -43,6 +43,7 @@ url+commit->name latest-repository-commit commit-difference + commit-relation git-checkout git-checkout? @@ -261,14 +262,16 @@ definitely available in REPOSITORY, false otherwise." #:key (ref '(branch . "master")) recursive? + starting-commit (log-port (%make-void-port "w")) (cache-directory (url-cache-directory url (%repository-cache-directory) #:recursive? recursive?))) - "Update the cached checkout of URL to REF in CACHE-DIRECTORY. Return two + "Update the cached checkout of URL to REF in CACHE-DIRECTORY. Return three values: the cache directory name, and the SHA1 commit (a string) corresponding -to REF. +to REF, and the relation of the new commit relative to STARTING-COMMIT (if +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>]. @@ -301,7 +304,17 @@ When RECURSIVE? is true, check out submodules as well, if any." (remote-fetch (remote-lookup repository "origin")))) (when recursive? (update-submodules repository #:log-port log-port)) - (let ((oid (switch-to-ref repository canonical-ref))) + + ;; Note: call 'commit-relation' from here because it's more efficient + ;; than letting users re-open the checkout later on. + (let* ((oid (switch-to-ref repository canonical-ref)) + (new (and starting-commit + (commit-lookup repository oid))) + (old (and starting-commit + (commit-lookup repository + (string->oid starting-commit)))) + (relation (and starting-commit + (commit-relation old new)))) ;; Reclaim file descriptors and memory mappings associated with ;; REPOSITORY as soon as possible. @@ -309,7 +322,7 @@ When RECURSIVE? is true, check out submodules as well, if any." 'repository-close!) (repository-close! repository)) - (values cache-directory (oid->string oid)))))) + (values cache-directory (oid->string oid) relation))))) (define* (latest-repository-commit store url #:key @@ -342,7 +355,7 @@ Log progress and checkout info to LOG-PORT." (format log-port "updating checkout of '~a'...~%" url) (let*-values - (((checkout commit) + (((checkout commit _) (update-cached-checkout url #:recursive? recursive? #:ref ref @@ -405,6 +418,21 @@ that of OLD." (cons head result) (set-insert head visited))))))) +(define (commit-relation old new) + "Return a symbol denoting the relation between OLD and NEW, two commit +objects: 'ancestor (meaning that OLD is an ancestor of NEW), 'descendant, or +'unrelated, or 'self (OLD and NEW are the same commit)." + (if (eq? old new) + 'self + (let ((newest (commit-closure new))) + (if (set-contains? newest old) + 'ancestor + (let* ((seen (list->setq (commit-parents new))) + (oldest (commit-closure old seen))) + (if (set-contains? oldest new) + 'descendant + 'unrelated)))))) + ;;; ;;; Checkouts. |