;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com>
-;;; Copyright © 2018, 2019 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2017, 2020 Mathieu Othacehe <m.othacehe@gmail.com>
+;;; Copyright © 2018, 2019, 2020 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
#:use-module (guix utils)
#:use-module (guix records)
#:use-module (guix gexp)
+ #:use-module (guix sets)
+ #:use-module ((guix diagnostics) #:select (leave))
#:use-module (rnrs bytevectors)
#:use-module (ice-9 match)
#:use-module (srfi srfi-1)
#:export (%repository-cache-directory
honor-system-x509-certificates!
+ url-cache-directory
+ with-repository
+ with-git-error-handling
+ false-if-git-not-found
update-cached-checkout
+ url+commit->name
latest-repository-commit
+ commit-difference
+ commit-relation
git-checkout
git-checkout?
git-checkout-url
- git-checkout-branch))
-
-;; XXX: Use this hack instead of #:autoload to avoid compilation errors.
-;; See <http://bugs.gnu.org/12202>.
-(module-autoload! (current-module)
- '(git submodule) '(repository-submodules))
+ git-checkout-branch
+ git-checkout-commit
+ git-checkout-recursive?))
(define %repository-cache-directory
(make-parameter (string-append (cache-directory #:ensure? #f)
(string-append "R:" url)
url))))))
+;; Authentication appeared in Guile-Git 0.3.0, check if it is available.
+(define auth-supported?
+ (false-if-exception (resolve-interface '(git auth))))
+
(define (clone* url directory)
"Clone git repository at URL into DIRECTORY. Upon failure,
make sure no empty directory is left behind."
;; value in Guile-Git: <https://bugs.gnu.org/29238>.
(if (module-defined? (resolve-interface '(git))
'clone-init-options)
- (clone url directory (clone-init-options))
+ (let ((auth-method (and auth-supported?
+ (%make-auth-ssh-agent))))
+ (clone url directory
+ (if auth-supported?
+ (make-clone-options
+ #:fetch-options (make-fetch-options auth-method))
+ (clone-init-options))))
(clone url directory)))
(lambda _
(false-if-exception (rmdir directory)))))
(last (string-split url #\/)) ".git" "")
"-" (string-take sha1 7)))
-(define (switch-to-ref repository ref)
- "Switch to REPOSITORY's branch, commit or tag specified by REF. Return the
-OID (roughly the commit hash) corresponding to REF."
- (define obj
+(define (resolve-reference repository ref)
+ "Resolve the branch, commit or tag specified by REF, and return the
+corresponding Git object."
+ (let resolve ((ref ref))
(match ref
(('branch . branch)
(let ((oid (reference-target
(&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)))))
+ ;; OID may point to a "tag" object, but it can also point directly
+ ;; to a "commit" object, as surprising as it may seem. Return that
+ ;; object, whatever that is.
+ (object-lookup repository oid))))))
+
+(define (switch-to-ref repository ref)
+ "Switch to REPOSITORY's branch, commit or tag specified by REF. Return the
+OID (roughly the commit hash) corresponding to REF."
+ (define obj
+ (resolve-reference repository ref))
(reset repository obj RESET_HARD)
(object-id obj))
(call-with-repository directory
(lambda (repository) exp ...)))
+(define (report-git-error error)
+ "Report the given Guile-Git error."
+ ;; Prior to Guile-Git commit b6b2760c2fd6dfaa5c0fedb43eeaff06166b3134,
+ ;; errors would be represented by integers.
+ (match error
+ ((? integer? error) ;old Guile-Git
+ (leave (G_ "Git error ~a~%") error))
+ ((? git-error? error) ;new Guile-Git
+ (leave (G_ "Git error: ~a~%") (git-error-message error)))))
+
+(define-syntax-rule (with-git-error-handling body ...)
+ (catch 'git-error
+ (lambda ()
+ body ...)
+ (lambda (key err)
+ (report-git-error err))))
+
+(define (load-git-submodules)
+ "Attempt to load (git submodules), which was missing until Guile-Git 0.2.0.
+Return true on success, false on failure."
+ (match (false-if-exception (resolve-interface '(git submodule)))
+ (#f
+ (set! load-git-submodules (const #f))
+ #f)
+ (iface
+ (module-use! (resolve-module '(guix git)) iface)
+ (set! load-git-submodules (const #t))
+ #t)))
+
(define* (update-submodules repository
#:key (log-port (current-error-port)))
"Update the submodules of REPOSITORY, a Git repository object."
;; Guile-Git < 0.2.0 did not have (git submodule).
- (if (false-if-exception (resolve-interface '(git submodule)))
+ (if (load-git-submodules)
(for-each (lambda (name)
(let ((submodule (submodule-lookup repository name)))
(format log-port (G_ "updating submodule '~a'...~%")
(G_ "Support for submodules is missing; \
please upgrade Guile-Git.~%"))))
+(define-syntax-rule (false-if-git-not-found exp)
+ "Evaluate EXP, returning #false if a GIT_ENOTFOUND error is raised."
+ (catch 'git-error
+ (lambda ()
+ exp)
+ (lambda (key error . rest)
+ (if (= GIT_ENOTFOUND (git-error-code error))
+ #f
+ (apply throw key error rest)))))
+
+(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)
+ (false-if-git-not-found
+ (->bool (commit-lookup repository (string->oid commit)))))
+ (_
+ #f)))
+
(define* (update-cached-checkout url
#:key
(ref '(branch . "master"))
recursive?
+ (check-out? #t)
+ 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] 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.
-When RECURSIVE? is true, check out submodules as well, if any."
+When CHECK-OUT? is true, reset the cached working tree to REF; otherwise leave
+it unchanged."
(define canonical-ref
;; We used to require callers to specify "origin/" for each branch, which
;; made little sense since the cache should be transparent to them. So
(repository-open cache-directory)
(clone* url cache-directory))))
;; Only fetch remote if it has not been cloned just before.
- (when cache-exists?
- (remote-fetch (remote-lookup repository "origin")))
+ (when (and cache-exists?
+ (not (reference-available? repository ref)))
+ (if auth-supported?
+ (let ((auth-method (and auth-supported?
+ (%make-auth-ssh-agent))))
+ (remote-fetch (remote-lookup repository "origin")
+ #:fetch-options (make-fetch-options auth-method)))
+ (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 (if check-out?
+ (switch-to-ref repository canonical-ref)
+ (object-id
+ (resolve-reference repository canonical-ref))))
+ (new (and starting-commit
+ (commit-lookup repository oid)))
+ (old (and starting-commit
+ (false-if-git-not-found
+ (commit-lookup repository
+ (string->oid starting-commit)))))
+ (relation (and starting-commit
+ (if old
+ (commit-relation old new)
+ 'unrelated))))
;; Reclaim file descriptors and memory mappings associated with
;; REPOSITORY as soon as possible.
'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
(format log-port "updating checkout of '~a'...~%" url)
(let*-values
- (((checkout commit)
+ (((checkout commit _)
(update-cached-checkout url
#:recursive? recursive?
#:ref ref
(set-exception-printer! 'git-error print-git-error)
\f
+;;;
+;;; Commit difference.
+;;;
+
+(define* (commit-closure commit #:optional (visited (setq)))
+ "Return the closure of COMMIT as a set. Skip commits contained in VISITED,
+a set, and adjoin VISITED to the result."
+ (let loop ((commits (list commit))
+ (visited visited))
+ (match commits
+ (()
+ visited)
+ ((head . tail)
+ (if (set-contains? visited head)
+ (loop tail visited)
+ (loop (append (commit-parents head) tail)
+ (set-insert head visited)))))))
+
+(define* (commit-difference new old #:optional (excluded '()))
+ "Return the list of commits between NEW and OLD, where OLD is assumed to be
+an ancestor of NEW. Exclude all the commits listed in EXCLUDED along with
+their ancestors.
+
+Essentially, this computes the set difference between the closure of NEW and
+that of OLD."
+ (let loop ((commits (list new))
+ (result '())
+ (visited (fold commit-closure
+ (setq)
+ (cons old excluded))))
+ (match commits
+ (()
+ (reverse result))
+ ((head . tail)
+ (if (set-contains? visited head)
+ (loop tail result visited)
+ (loop (append (commit-parents head) tail)
+ (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))))))
+
+\f
;;;
;;; Checkouts.
;;;
git-checkout?
(url git-checkout-url)
(branch git-checkout-branch (default "master"))
- (commit git-checkout-commit (default #f))
+ (commit git-checkout-commit (default #f)) ;#f | tag | commit
(recursive? git-checkout-recursive? (default #f)))
(define* (latest-repository-commit* url #:key ref recursive? log-port)
(($ <git-checkout> url branch commit recursive?)
(latest-repository-commit* url
#:ref (if commit
- `(commit . ,commit)
+ `(tag-or-commit . ,commit)
`(branch . ,branch))
#:recursive? recursive?
#:log-port (current-error-port)))))
HCoop / jackhill / guix / guix.git / blobdiff