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-rw-r--r--Makefile.am7
-rw-r--r--configure.ac4
-rw-r--r--guix/git.scm123
3 files changed, 134 insertions, 0 deletions
diff --git a/Makefile.am b/Makefile.am
index 3925f3e2dc..1be09d7637 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -201,6 +201,13 @@ MODULES += \
endif HAVE_GUILE_SSH
+if HAVE_GUILE_GIT
+
+MODULES += \
+ guix/git.scm
+
+endif HAVE_GUILE_GIT
+
if BUILD_DAEMON_OFFLOAD
MODULES += \
diff --git a/configure.ac b/configure.ac
index dc3d8f377f..c937e948d3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -104,6 +104,10 @@ dnl Guile-JSON is used in various places.
GUILE_MODULE_AVAILABLE([have_guile_json], [(json)])
AM_CONDITIONAL([HAVE_GUILE_JSON], [test "x$have_guile_json" = "xyes"])
+dnl Check for Guile-Git.
+GUILE_MODULE_AVAILABLE([have_guile_git], [(git)])
+AM_CONDITIONAL([HAVE_GUILE_GIT], [test "x$have_guile_git" = "xyes"])
+
dnl Make sure we have a full-fledged Guile.
GUIX_ASSERT_GUILE_FEATURES([regex posix socket net-db threads])
diff --git a/guix/git.scm b/guix/git.scm
new file mode 100644
index 0000000000..17a6784aef
--- /dev/null
+++ b/guix/git.scm
@@ -0,0 +1,123 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (guix git)
+ #:use-module (git)
+ #:use-module (git object)
+ #:use-module (guix base32)
+ #:use-module (guix hash)
+ #:use-module (guix build utils)
+ #:use-module (guix store)
+ #:use-module (guix utils)
+ #:use-module (rnrs bytevectors)
+ #:use-module (ice-9 match)
+ #:use-module (srfi srfi-1)
+ #:export (%repository-cache-directory
+ latest-repository-commit))
+
+(define %repository-cache-directory
+ (make-parameter "/var/cache/guix/checkouts"))
+
+(define-syntax-rule (with-libgit2 thunk ...)
+ (dynamic-wind
+ (lambda ()
+ (libgit2-init!))
+ (lambda ()
+ thunk ...)
+ (lambda ()
+ (libgit2-shutdown))))
+
+(define* (url-cache-directory url
+ #:optional (cache-directory
+ (%repository-cache-directory)))
+ "Return the directory associated to URL in %repository-cache-directory."
+ (string-append
+ cache-directory "/"
+ (bytevector->base32-string (sha256 (string->utf8 url)))))
+
+(define (clone* url directory)
+ "Clone git repository at URL into DIRECTORY. Upon failure,
+make sure no empty directory is left behind."
+ (with-throw-handler #t
+ (lambda ()
+ (mkdir-p directory)
+ (clone url directory))
+ (lambda _
+ (false-if-exception (rmdir directory)))))
+
+(define (repository->head-sha1 repo)
+ "Return the sha1 of the HEAD commit in REPOSITORY as a string."
+ (let ((oid (reference-target (repository-head repo))))
+ (oid->string (commit-id (commit-lookup repo oid)))))
+
+(define (url+commit->name url sha1)
+ "Return the string \"<REPO-NAME>-<SHA1:7>\" where REPO-NAME is the name of
+the git repository, extracted from URL and SHA1:7 the seven first digits
+of SHA1 string."
+ (string-append
+ (string-replace-substring
+ (last (string-split url #\/)) ".git" "")
+ "-" (string-take sha1 7)))
+
+(define* (copy-to-store store cache-directory #:key url repository)
+ "Copy items in cache-directory to store. URL and REPOSITORY are used
+to forge store directory name."
+ (let* ((commit (repository->head-sha1 repository))
+ (name (url+commit->name url commit)))
+ (values (add-to-store store name #t "sha256" cache-directory) commit)))
+
+(define (switch-to-ref repository ref)
+ "Switch to REPOSITORY's branch, commit or tag specified by REF."
+ (let* ((oid (match ref
+ (('branch . branch)
+ (reference-target
+ (branch-lookup repository branch BRANCH-REMOTE)))
+ (('commit . commit)
+ (string->oid commit))
+ (('tag . tag)
+ (reference-name->oid repository
+ (string-append "refs/tags/" tag)))))
+ (obj (object-lookup repository oid)))
+ (reset repository obj RESET_HARD)))
+
+(define* (latest-repository-commit store url
+ #:key
+ (cache-directory
+ (%repository-cache-directory))
+ (ref '(branch . "origin/master")))
+ "Return two values: the content of the git repository at URL copied into a
+store directory and the sha1 of the top level commit in this directory. The
+reference to be checkout, once the repository is fetched, is specified by REF.
+REF is pair whose key is [branch | commit | tag] and value the associated
+data, respectively [<branch name> | <sha1> | <tag name>].
+
+Git repositories are kept in the cache directory specified by
+%repository-cache-directory parameter."
+ (with-libgit2
+ (let* ((cache-dir (url-cache-directory url cache-directory))
+ (cache-exists? (openable-repository? cache-dir))
+ (repository (if cache-exists?
+ (repository-open cache-dir)
+ (clone* url cache-dir))))
+ ;; Only fetch remote if it has not been cloned just before.
+ (when cache-exists?
+ (remote-fetch (remote-lookup repository "origin")))
+ (switch-to-ref repository ref)
+ (copy-to-store store cache-dir
+ #:url url
+ #:repository repository))))