220 lines
8.6 KiB
Scheme
220 lines
8.6 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com>
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;;; Copyright © 2018 Ludovic Courtès <ludo@gnu.org>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (guix git)
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#:use-module (git)
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#:use-module (git object)
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#:use-module (guix base32)
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#:use-module (gcrypt hash)
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#:use-module ((guix build utils) #:select (mkdir-p))
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#:use-module (guix store)
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#:use-module (guix utils)
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#:use-module (guix records)
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#:use-module (guix gexp)
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#:use-module (rnrs bytevectors)
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#:use-module (ice-9 match)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-11)
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#:use-module (srfi srfi-34)
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#:use-module (srfi srfi-35)
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#:export (%repository-cache-directory
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update-cached-checkout
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latest-repository-commit
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git-checkout
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git-checkout?
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git-checkout-url
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git-checkout-branch))
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(define %repository-cache-directory
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(make-parameter (string-append (cache-directory #:ensure? #f)
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"/checkouts")))
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(define-syntax-rule (with-libgit2 thunk ...)
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(begin
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;; XXX: The right thing to do would be to call (libgit2-shutdown) here,
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;; but pointer finalizers used in guile-git may be called after shutdown,
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;; resulting in a segfault. Hence, let's skip shutdown call for now.
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(libgit2-init!)
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thunk ...))
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(define* (url-cache-directory url
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#:optional (cache-directory
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(%repository-cache-directory)))
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"Return the directory associated to URL in %repository-cache-directory."
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(string-append
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cache-directory "/"
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(bytevector->base32-string (sha256 (string->utf8 url)))))
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(define (clone* url directory)
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"Clone git repository at URL into DIRECTORY. Upon failure,
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make sure no empty directory is left behind."
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(with-throw-handler #t
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(lambda ()
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(mkdir-p directory)
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;; Note: Explicitly pass options to work around the invalid default
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;; value in Guile-Git: <https://bugs.gnu.org/29238>.
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(if (module-defined? (resolve-interface '(git))
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'clone-init-options)
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(clone url directory (clone-init-options))
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(clone url directory)))
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(lambda _
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(false-if-exception (rmdir directory)))))
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(define (url+commit->name url sha1)
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"Return the string \"<REPO-NAME>-<SHA1:7>\" where REPO-NAME is the name of
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the git repository, extracted from URL and SHA1:7 the seven first digits
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of SHA1 string."
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(string-append
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(string-replace-substring
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(last (string-split url #\/)) ".git" "")
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"-" (string-take sha1 7)))
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(define (switch-to-ref repository ref)
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"Switch to REPOSITORY's branch, commit or tag specified by REF. Return the
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OID (roughly the commit hash) corresponding to REF."
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(define obj
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(match ref
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(('branch . branch)
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(let ((oid (reference-target
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(branch-lookup repository branch BRANCH-REMOTE))))
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(object-lookup repository oid)))
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(('commit . commit)
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(let ((len (string-length commit)))
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;; 'object-lookup-prefix' appeared in Guile-Git in Mar. 2018, so we
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;; can't be sure it's available. Furthermore, 'string->oid' used to
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;; read out-of-bounds when passed a string shorter than 40 chars,
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;; which is why we delay calls to it below.
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(if (< len 40)
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(if (module-defined? (resolve-interface '(git object))
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'object-lookup-prefix)
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(object-lookup-prefix repository (string->oid commit) len)
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(raise (condition
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(&message
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(message "long Git object ID is required")))))
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(object-lookup repository (string->oid commit)))))
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(('tag . tag)
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(let ((oid (reference-name->oid repository
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(string-append "refs/tags/" tag))))
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(object-lookup repository oid)))))
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(reset repository obj RESET_HARD)
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(object-id obj))
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(define* (update-cached-checkout url
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#:key
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(ref '(branch . "master"))
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(cache-directory
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(url-cache-directory
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url (%repository-cache-directory))))
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"Update the cached checkout of URL to REF in CACHE-DIRECTORY. Return two
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values: the cache directory name, and the SHA1 commit (a string) corresponding
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to REF.
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REF is pair whose key is [branch | commit | tag] and value the associated
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data, respectively [<branch name> | <sha1> | <tag name>]."
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(define canonical-ref
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;; We used to require callers to specify "origin/" for each branch, which
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;; made little sense since the cache should be transparent to them. So
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;; here we append "origin/" if it's missing and otherwise keep it.
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(match ref
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(('branch . branch)
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`(branch . ,(if (string-prefix? "origin/" branch)
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branch
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(string-append "origin/" branch))))
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(_ ref)))
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(with-libgit2
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(let* ((cache-exists? (openable-repository? cache-directory))
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(repository (if cache-exists?
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(repository-open cache-directory)
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(clone* url cache-directory))))
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;; Only fetch remote if it has not been cloned just before.
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(when cache-exists?
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(remote-fetch (remote-lookup repository "origin")))
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(let ((oid (switch-to-ref repository canonical-ref)))
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;; Reclaim file descriptors and memory mappings associated with
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;; REPOSITORY as soon as possible.
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(when (module-defined? (resolve-interface '(git repository))
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'repository-close!)
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(repository-close! repository))
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(values cache-directory (oid->string oid))))))
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(define* (latest-repository-commit store url
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#:key
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(log-port (%make-void-port "w"))
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(cache-directory
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(%repository-cache-directory))
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(ref '(branch . "master")))
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"Return two values: the content of the git repository at URL copied into a
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store directory and the sha1 of the top level commit in this directory. The
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reference to be checkout, once the repository is fetched, is specified by REF.
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REF is pair whose key is [branch | commit | tag] and value the associated
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data, respectively [<branch name> | <sha1> | <tag name>].
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Git repositories are kept in the cache directory specified by
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%repository-cache-directory parameter.
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Log progress and checkout info to LOG-PORT."
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(define (dot-git? file stat)
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(and (string=? (basename file) ".git")
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(eq? 'directory (stat:type stat))))
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(format log-port "updating checkout of '~a'...~%" url)
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(let*-values
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(((checkout commit)
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(update-cached-checkout url
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#:ref ref
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#:cache-directory
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(url-cache-directory url cache-directory)))
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((name)
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(url+commit->name url commit)))
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(format log-port "retrieved commit ~a~%" commit)
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(values (add-to-store store name #t "sha256" checkout
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#:select? (negate dot-git?))
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commit)))
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;;;
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;;; Checkouts.
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;;;
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;; Representation of the "latest" checkout of a branch.
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(define-record-type* <git-checkout>
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git-checkout make-git-checkout
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git-checkout?
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(url git-checkout-url)
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(branch git-checkout-branch (default "master")))
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(define latest-repository-commit*
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(store-lift latest-repository-commit))
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(define-gexp-compiler (git-checkout-compiler (checkout <git-checkout>)
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system target)
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;; "Compile" CHECKOUT by updating the local checkout and adding it to the
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;; store.
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(match checkout
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(($ <git-checkout> url branch)
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(latest-repository-commit* url
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#:ref `(branch . ,branch)
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#:log-port (current-error-port)))))
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