123 lines
5.0 KiB
Scheme
123 lines
5.0 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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;;;
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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 (guix 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 (rnrs bytevectors)
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#:use-module (ice-9 match)
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#:use-module (srfi srfi-1)
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#:export (%repository-cache-directory
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latest-repository-commit))
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(define %repository-cache-directory
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(make-parameter "/var/cache/guix/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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(clone url directory))
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(lambda _
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(false-if-exception (rmdir directory)))))
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(define (repository->head-sha1 repo)
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"Return the sha1 of the HEAD commit in REPOSITORY as a string."
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(let ((oid (reference-target (repository-head repo))))
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(oid->string (commit-id (commit-lookup repo oid)))))
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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* (copy-to-store store cache-directory #:key url repository)
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"Copy items in cache-directory to store. URL and REPOSITORY are used
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to forge store directory name."
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(let* ((commit (repository->head-sha1 repository))
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(name (url+commit->name url commit)))
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(values (add-to-store store name #t "sha256" cache-directory) commit)))
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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."
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(let* ((oid (match ref
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(('branch . branch)
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(reference-target
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(branch-lookup repository branch BRANCH-REMOTE)))
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(('commit . commit)
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(string->oid commit))
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(('tag . tag)
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(reference-name->oid repository
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(string-append "refs/tags/" tag)))))
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(obj (object-lookup repository oid)))
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(reset repository obj RESET_HARD)))
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(define* (latest-repository-commit store url
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#:key
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(cache-directory
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(%repository-cache-directory))
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(ref '(branch . "origin/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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(with-libgit2
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(let* ((cache-dir (url-cache-directory url cache-directory))
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(cache-exists? (openable-repository? cache-dir))
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(repository (if cache-exists?
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(repository-open cache-dir)
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(clone* url cache-dir))))
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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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(switch-to-ref repository ref)
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(copy-to-store store cache-dir
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#:url url
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#:repository repository))))
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