import: Add 'generic-git' updater.

* guix/git.scm (ls-remote-refs): New procedure.
* tests/git.scm ("remote-refs" "remote-refs: only tags"): New tests.
* guix/import/git.scm: New file.
* doc/guix.texi (Invoking guix refresh): Document it.
* tests/import-git.scm: New test file.
* Makefile.am (MODULES, SCM_TESTS): Register the new files.

Co-authored-by: Sarah Morgensen <iskarian@mgsn.dev>
Signed-off-by: Ludovic Courtès <ludo@gnu.org>

2 files changed, 273 insertions, 0 deletions

diff --git a/tests/git.scm b/tests/git.scm
index aa4f03ca62..d0646bbc85 100644
--- a/tests/git.scm
+++ b/tests/git.scm
@@ -1,5 +1,6 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2019, 2020 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2021 Xinglu Chen <public@yoctocell.xyz
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -161,4 +162,31 @@
               (commit-relation master1 merge)
               (commit-relation merge master1))))))
 
+(unless (which (git-command)) (test-skip 1))
+(test-equal "remote-refs"
+  '("refs/heads/develop" "refs/heads/master"
+    "refs/tags/v1.0" "refs/tags/v1.1")
+  (with-temporary-git-repository directory
+      '((add "a.txt" "A")
+        (commit "First commit")
+        (tag "v1.0" "release-1.0")
+        (branch "develop")
+        (checkout "develop")
+        (add "b.txt" "B")
+        (commit "Second commit")
+        (tag "v1.1" "release-1.1"))
+    (remote-refs directory)))
+
+(unless (which (git-command)) (test-skip 1))
+(test-equal "remote-refs: only tags"
+ '("refs/tags/v1.0" "refs/tags/v1.1")
+  (with-temporary-git-repository directory
+      '((add "a.txt" "A")
+        (commit "First commit")
+        (tag "v1.0" "Release 1.0")
+        (add "b.txt" "B")
+        (commit "Second commit")
+        (tag "v1.1" "Release 1.1"))
+    (remote-refs directory #:tags? #t)))
+
 (test-end "git")
diff --git a/tests/import-git.scm b/tests/import-git.scm
new file mode 100644
index 0000000000..f1bce154bb
--- /dev/null
+++ b/tests/import-git.scm
@@ -0,0 +1,245 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2021 Xinglu Chen <public@yoctocell.xyz
+;;;
+;;; 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 (test-import-git)
+  #:use-module (git)
+  #:use-module (guix git)
+  #:use-module (guix tests)
+  #:use-module (guix packages)
+  #:use-module (guix import git)
+  #:use-module (guix git-download)
+  #:use-module (guix tests git)
+  #:use-module (guix build utils)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-64))
+
+;; Test the (guix import git) tools.
+
+(test-begin "git")
+
+(define* (make-package directory version #:optional (properties '()))
+  (dummy-package "test-package"
+    (version version)
+    (properties properties)
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url (string-append "file://" directory))
+             (commit version)))
+       (sha256
+        (base32
+         "0000000000000000000000000000000000000000000000000000"))))))
+
+(unless (which (git-command)) (test-skip 1))
+(test-equal "latest-git-tag-version: no custom prefix, suffix, and delimiter"
+  "1.0.1"
+  (with-temporary-git-repository directory
+      '((add "a.txt" "A")
+        (commit "First commit")
+        (tag "1.0.1" "Release 1.0.1"))
+    (let ((package (make-package directory "1.0.0")))
+      (latest-git-tag-version package))))
+
+(unless (which (git-command)) (test-skip 1))
+(test-equal "latest-git-tag-version: custom prefix, no suffix and delimiter"
+  "1.0.1"
+  (with-temporary-git-repository directory
+      '((add "a.txt" "A")
+        (commit "First commit")
+        (tag "prefix-1.0.1" "Release 1.0.1"))
+    (let ((package (make-package directory "1.0.0"
+                                 '((release-tag-prefix . "prefix-")))))
+      (latest-git-tag-version package))))
+
+(unless (which (git-command)) (test-skip 1))
+(test-equal "latest-git-tag-version: custom suffix, no prefix and delimiter"
+  "1.0.1"
+  (with-temporary-git-repository directory
+      '((add "a.txt" "A")
+        (commit "First commit")
+        (tag "1.0.1-suffix-123" "Release 1.0.1"))
+    (let ((package (make-package directory "1.0.0"
+                                 '((release-tag-suffix . "-suffix-[0-9]*")))))
+      (latest-git-tag-version package))))
+
+(unless (which (git-command)) (test-skip 1))
+(test-equal "latest-git-tag-version: custom delimiter, no prefix and suffix"
+  "2021.09.07"
+  (with-temporary-git-repository directory
+      '((add "a.txt" "A")
+        (commit "First commit")
+        (tag "2021-09-07" "Release 2021-09-07"))
+    (let ((package (make-package directory "2021-09-06"
+                                 '((release-tag-version-delimiter . "-")))))
+      (latest-git-tag-version package))))
+
+(unless (which (git-command)) (test-skip 1))
+(test-equal "latest-git-tag-version: empty delimiter, no prefix and suffix"
+  "20210907"
+  (with-temporary-git-repository directory
+      '((add "a.txt" "A")
+        (commit "First commit")
+        (tag "20210907" "Release 20210907"))
+    (let ((package (make-package directory "20210906"
+                                 '((release-tag-version-delimiter . "")))))
+      (latest-git-tag-version package))))
+
+(unless (which (git-command)) (test-skip 1))
+(test-equal "latest-git-tag-version: custom prefix and suffix, no delimiter"
+  "2.0.0"
+  (with-temporary-git-repository directory
+      '((add "a.txt" "A")
+        (commit "First commit")
+        (tag "Release-2.0.0suffix-1" "Release 2.0.0"))
+    (let ((package (make-package directory "1.0.0"
+                                 '((release-tag-prefix . "Release-")
+                                   (release-tag-suffix . "suffix-[0-9]")))))
+      (latest-git-tag-version package))))
+
+(unless (which (git-command)) (test-skip 1))
+(test-equal "latest-git-tag-version: custom prefix, suffix, and delimiter"
+  "2.0.0"
+  (with-temporary-git-repository directory
+      '((add "a.txt" "A")
+        (commit "First commit")
+        (tag "Release-2_0_0suffix-1" "Release 2.0.0"))
+    (let ((package (make-package directory "1.0.0"
+                                 '((release-tag-prefix . "Release-")
+                                   (release-tag-suffix . "suffix-[0-9]")
+                                   (release-tag-version-delimiter . "_")))))
+      (latest-git-tag-version package))))
+
+(unless (which (git-command)) (test-skip 1))
+(test-equal "latest-git-tag-version: only pre-releases available"
+  #f
+  (with-temporary-git-repository directory
+      '((add "a.txt" "A")
+        (commit "First commit")
+        (tag "2.0.0-rc1" "Release candidate for 2.0.0"))
+    (let ((package (make-package directory "1.0.0")))
+      (latest-git-tag-version package))))
+
+(unless (which (git-command)) (test-skip 1))
+(test-equal "latest-git-tag-version: accept pre-releases"
+  "2.0.0-rc1"
+  (with-temporary-git-repository directory
+      '((add "a.txt" "A")
+        (commit "First commit")
+        (tag "2.0.0-rc1" "Release candidate for 2.0.0"))
+    (let ((package (make-package directory "1.0.0"
+                                 '((accept-pre-releases? . #t)))))
+      (latest-git-tag-version package))))
+
+(unless (which (git-command)) (test-skip 1))
+(test-equal "latest-git-tag-version: accept pre-releases, and custom prefix"
+  "2.0.0-rc1"
+  (with-temporary-git-repository directory
+      '((add "a.txt" "A")
+        (commit "First commit")
+        (tag "version-2.0.0-rc1" "Release candidate for 2.0.0"))
+    (let ((package (make-package directory "1.0.0"
+                                 '((accept-pre-releases? . #t)
+                                   (release-tag-prefix . "version-")))))
+      (latest-git-tag-version package))))
+
+(unless (which (git-command)) (test-skip 1))
+(test-equal "latest-git-tag-version: accept pre-releases, and custom suffix"
+  "2.0.0-rc1"
+  (with-temporary-git-repository directory
+      '((add "a.txt" "A")
+        (commit "First commit")
+        (tag "2.0.0-rc1-suffix" "Release candidate for 2.0.0"))
+    (let ((package (make-package directory "1.0.0"
+                                 '((accept-pre-releases? . #t)
+                                   (release-tag-suffix . "-suffix")))))
+      (latest-git-tag-version package))))
+
+(unless (which (git-command)) (test-skip 1))
+(test-equal "latest-git-tag-version: accept pre-releases, delimiter conflicts with pre-release part"
+  "2.0.0_alpha"
+  (with-temporary-git-repository directory
+      '((add "a.txt" "A")
+        (commit "First commit")
+        (tag "2_0_0_alpha" "Alpha release for 2.0.0"))
+    (let ((package (make-package directory "1.0.0"
+                                 '((accept-pre-releases? . #t)
+                                   (release-tag-version-delimiter . "_")))))
+      (latest-git-tag-version package))))
+
+(unless (which (git-command)) (test-skip 1))
+(test-equal "latest-git-tag-version: accept pre-releases, and custom suffix and prefix"
+  "2.0.0-alpha"
+  (with-temporary-git-repository directory
+      '((add "a.txt" "A")
+        (commit "First commit")
+        (tag "prefix123-2.0.0-alpha-suffix" "Alpha release for 2.0.0"))
+    (let ((package (make-package directory "1.0.0"
+                                 '((accept-pre-releases? . #t)
+                                   (release-tag-prefix . "prefix[0-9]{3}-")
+                                   (release-tag-suffix . "-suffix")))))
+      (latest-git-tag-version package))))
+
+(unless (which (git-command)) (test-skip 1))
+(test-equal "latest-git-tag-version: accept pre-releases, and custom suffix, prefix, and delimiter"
+  "2.0.0-alpha"
+  (with-temporary-git-repository directory
+      '((add "a.txt" "A")
+        (commit "First commit")
+        (tag "prefix123-2-0-0-alpha-suffix" "Alpha release for 2.0.0"))
+    (let ((package (make-package directory "1.0.0"
+                                 '((accept-pre-releases? . #t)
+                                   (release-tag-prefix . "prefix[0-9]{3}-")
+                                   (release-tag-suffix . "-suffix")
+                                   (release-tag-version-delimiter . "-")))))
+      (latest-git-tag-version package))))
+
+(unless (which (git-command)) (test-skip 1))
+(test-equal "latest-git-tag-version: accept pre-releases, no delimiter, and custom suffix, prefix"
+  "2alpha"
+  (with-temporary-git-repository directory
+      '((add "a.txt" "A")
+        (commit "First commit")
+        (tag "prefix123-2alpha-suffix" "Alpha release for version 2"))
+    (let ((package (make-package directory "1.0.0"
+                                 '((accept-pre-releases? . #t)
+                                   (release-tag-prefix . "prefix[0-9]{3}-")
+                                   (release-tag-suffix . "-suffix")
+                                   (release-tag-version-delimiter . "")))))
+      (latest-git-tag-version package))))
+
+(unless (which (git-command)) (test-skip 1))
+(test-equal "latest-git-tag-version: no tags found"
+  #f
+  (with-temporary-git-repository directory
+      '((add "a.txt" "A")
+        (commit "First commit"))
+    (let ((package (make-package directory "1.0.0")))
+      (latest-git-tag-version package))))
+
+(unless (which (git-command)) (test-skip 1))
+(test-equal "latest-git-tag-version: no valid tags found"
+  #f
+  (with-temporary-git-repository directory
+      '((add "a.txt" "A")
+        (commit "First commit")
+        (tag "Test" "Test tag"))
+    (let ((package (make-package directory "1.0.0")))
+      (latest-git-tag-version package))))
+
+(test-end "git")