gnu: libgit2: Update to 0.99.0.

* gnu/packages/patches/libgit2-avoid-python.patch: Delete file.
* gnu/local.mk (dist_patch_DATA): Adjust accordingly.
* gnu/packages/version-control.scm (libgit2): Update to 0.99.0.
[source](patches): Remove 'libgit2-avoid-python.patch'.
[source](snippet): Preserve bundled copy of http-parser.
[arguments]: Remove "-DUSE_SHA1DC" from #:configure-flags, which is no longer
optional and enabled by default.  Add "-DUSE_NTLMCLIENT=OFF" and
"-DREGEX_BACKEND=pcre2".  Add phase 'fix-pcre2-reference'.
[inputs]: Remove HTTP-PARSER.
[propagated-inputs]: Add PCRE2.
[native-inputs]: Remove GUILE-2.2.  Add PYTHON.

3 files changed, 30 insertions, 337 deletions

diff --git a/gnu/local.mk b/gnu/local.mk
index b62468c923..71a39b73a1 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -1096,7 +1096,6 @@ dist_patch_DATA =						\
   %D%/packages/patches/libexif-CVE-2018-20030.patch		\
   %D%/packages/patches/libextractor-exiv2.patch			\
   %D%/packages/patches/libgeotiff-adapt-test-script-for-proj-6.2.patch		\
-  %D%/packages/patches/libgit2-avoid-python.patch		\
   %D%/packages/patches/libgit2-mtime-0.patch			\
   %D%/packages/patches/libgnome-encoding.patch			\
   %D%/packages/patches/libgnomeui-utf8.patch			\
diff --git a/gnu/packages/patches/libgit2-avoid-python.patch b/gnu/packages/patches/libgit2-avoid-python.patch
deleted file mode 100644
index b2e5141563..0000000000
--- a/gnu/packages/patches/libgit2-avoid-python.patch
+++ /dev/null
@@ -1,322 +0,0 @@
-This provides a Guile reimplementation of clar's "generate.py".
-It makes it possible for us to remove Python from libgit2's build-time
-dependencies.
-libgit2 is used in order to fetch a lot of sources for guix packages.
-Both Python2 and Python3 builds acted up in the past.
-Hence this patch which makes the number of libgit2 dependencies very
-small.
-The reimplementation tries to keep as close as possible to the original
-in both structure and runtime effect.  Some things are thus overly
-convoluted just to make them the same as in the original.
-
-Both implementations basically do:
-
-grep -r 'test_.*__.*' . > clar.suite
-
-It is important that the directory traversal order of the original and
-the reimplementation stay the same.
-
-diff -ruN orig/libgit2-0.27.7/tests/CMakeLists.txt libgit2-0.27.7/tests/CMakeLists.txt
---- orig/libgit2-0.27.7/tests/CMakeLists.txt	1970-01-01 01:00:00.000000000 +0100
-+++ libgit2-0.27.7/tests/CMakeLists.txt	2019-03-04 11:13:06.640118979 +0100
-@@ -1,10 +1,3 @@
--FIND_PACKAGE(PythonInterp)
--
--IF(NOT PYTHONINTERP_FOUND)
--  MESSAGE(FATAL_ERROR "Could not find a python interpeter, which is needed to build the tests. "
--    "Make sure python is available, or pass -DBUILD_CLAR=OFF to skip building the tests")
--ENDIF()
--
- SET(CLAR_FIXTURES "${CMAKE_CURRENT_SOURCE_DIR}/resources/")
- SET(CLAR_PATH "${CMAKE_CURRENT_SOURCE_DIR}")
- ADD_DEFINITIONS(-DCLAR_FIXTURE_PATH=\"${CLAR_FIXTURES}\")
-@@ -21,7 +14,7 @@
- 
- ADD_CUSTOM_COMMAND(
- 	OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/clar.suite
--	COMMAND ${PYTHON_EXECUTABLE} generate.py -o "${CMAKE_CURRENT_BINARY_DIR}" -f -xonline -xstress -xperf .
-+	COMMAND guile generate.scm -o "${CMAKE_CURRENT_BINARY_DIR}" -f -x online -x stress -x perf .
- 	DEPENDS ${SRC_TEST}
- 	WORKING_DIRECTORY ${CLAR_PATH}
- )
-diff -ruN orig/libgit2-0.27.7/tests/generate.scm libgit2-0.27.7/tests/generate.scm
---- orig/libgit2-0.27.7/tests/generate.scm	1970-01-01 01:00:00.000000000 +0100
-+++ libgit2-0.27.7/tests/generate.scm	2019-03-04 12:18:00.688040975 +0100
-@@ -0,0 +1,277 @@
-+;; -*- geiser-scheme-implementation: guile -*-
-+
-+;;; Implementation: Danny Milosavljevic <dannym@scratchpost.org>
-+;;; Based on: Implementation in Python by Vicent Marti.
-+;;; License: ISC, like the original generate.py in clar.
-+
-+(use-modules (ice-9 ftw))
-+(use-modules (ice-9 regex))
-+(use-modules (ice-9 getopt-long))
-+(use-modules (ice-9 rdelim))
-+(use-modules (ice-9 match))
-+(use-modules (ice-9 textual-ports))
-+(use-modules (srfi srfi-1))
-+
-+(define (render-callback cb)
-+  (if cb
-+      (string-append "    { \"" (assoc-ref cb "short-name") "\", &"
-+                     (assoc-ref cb "symbol") " }")
-+      "    { NULL, NULL }"))
-+
-+(define (replace needle replacement haystack)
-+  "Replace all occurences of NEEDLE in HAYSTACK by REPLACEMENT.
-+NEEDLE is a regular expression."
-+  (regexp-substitute/global #f needle haystack 'pre replacement 'post))
-+
-+(define (skip-comments* text)
-+  (call-with-input-string
-+   text
-+   (lambda (port)
-+     (let loop ((result '())
-+                (section #f))
-+       (define (consume-char)
-+         (cons (read-char port) result))
-+       (define (skip-char)
-+         (read-char port)
-+         result)
-+       (match section
-+        (#f
-+         (match (peek-char port)
-+          (#\/ (loop (consume-char) 'almost-in-block-comment))
-+          (#\" (loop (consume-char) 'in-string-literal))
-+          (#\' (loop (consume-char) 'in-character-literal))
-+          ((? eof-object?) result)
-+          (_ (loop (consume-char) section))))
-+        ('almost-in-block-comment
-+         (match (peek-char port)
-+          (#\* (loop (consume-char) 'in-block-comment))
-+          (#\/ (loop (consume-char) 'in-line-comment))
-+          ((? eof-object?) result)
-+          (_ (loop (consume-char) #f))))
-+        ('in-line-comment
-+         (match (peek-char port)
-+          (#\newline (loop (consume-char) #f))
-+          ((? eof-object?) result)
-+          (_ (loop (skip-char) section))))
-+        ('in-block-comment
-+         (match (peek-char port)
-+           (#\* (loop (skip-char) 'almost-out-of-block-comment))
-+           ((? eof-object?) result)
-+           (_ (loop (skip-char) section))))
-+        ('almost-out-of-block-comment
-+         (match (peek-char port)
-+           (#\/ (loop (cons (read-char port) (cons #\* result)) #f))
-+           (#\* (loop (skip-char) 'almost-out-of-block-comment))
-+           ((? eof-object?) result)
-+           (_ (loop (skip-char) 'in-block-comment))))
-+        ('in-string-literal
-+         (match (peek-char port)
-+           (#\\ (loop (consume-char) 'in-string-literal-escape))
-+           (#\" (loop (consume-char) #f))
-+           ((? eof-object?) result)
-+           (_ (loop (consume-char) section))))
-+        ('in-string-literal-escape
-+         (match (peek-char port)
-+           ((? eof-object?) result)
-+           (_ (loop (consume-char) 'in-string-literal))))
-+        ('in-character-literal
-+         (match (peek-char port)
-+           (#\\ (loop (consume-char) 'in-character-literal-escape))
-+           (#\' (loop (consume-char) #f))
-+           ((? eof-object?) result)
-+           (_ (loop (consume-char) section))))
-+        ('in-character-literal-escape
-+         (match (peek-char port)
-+           ((? eof-object?) result)
-+           (_ (loop (consume-char) 'in-character-literal)))))))))
-+
-+(define (skip-comments text)
-+  (list->string (reverse (skip-comments* text))))
-+
-+(define (maybe-only items)
-+  (match items
-+   ((a) a)
-+   (_ #f)))
-+
-+(define (Module name path excludes)
-+  (let* ((clean-name (replace "_" "::" name))
-+         (enabled (not (any (lambda (exclude)
-+                              (string-prefix? exclude clean-name))
-+                            excludes))))
-+    (define (parse contents)
-+      (define (cons-match match prev)
-+        (cons
-+         `(("declaration" . ,(match:substring match 1))
-+           ("symbol" . ,(match:substring match 2))
-+           ("short-name" . ,(match:substring match 3)))
-+         prev))
-+      (let* ((contents (skip-comments contents))
-+             (entries (fold-matches (make-regexp
-+                                     (string-append "^(void\\s+(test_"
-+                                                    name
-+                                                    "__(\\w+))\\s*\\(\\s*void\\s*\\))\\s*\\{")
-+                                     regexp/newline)
-+                                    contents
-+                                    '()
-+                                    cons-match))
-+             (entries (reverse entries))
-+             (callbacks (filter (lambda (entry)
-+                                   (match (assoc-ref entry "short-name")
-+                                    ("initialize" #f)
-+                                    ("cleanup" #f)
-+                                    (_ #t)))
-+                                entries)))
-+        (if (> (length callbacks) 0)
-+            `(("name" . ,name)
-+              ("enabled" . ,(if enabled "1" "0"))
-+              ("clean-name" . ,clean-name)
-+              ("initialize" . ,(maybe-only (filter-map (lambda (entry)
-+                                                      (match (assoc-ref entry "short-name")
-+                                                       ("initialize" entry)
-+                                                       (_ #f)))
-+                                                     entries)))
-+              ("cleanup" . ,(maybe-only (filter-map (lambda (entry)
-+                                                   (match (assoc-ref entry "short-name")
-+                                                    ("cleanup" entry)
-+                                                    (_ #f)))
-+                                                  entries)))
-+              ("callbacks" . ,callbacks))
-+            #f)))
-+
-+    (define (refresh path)
-+      (and (file-exists? path)
-+           (parse (call-with-input-file path get-string-all))))
-+    (refresh path)))
-+
-+(define (generate-TestSuite path output excludes)
-+    (define (load)
-+        (define enter? (const #t))
-+        (define (leaf file stat result)
-+          (let* ((module-root (string-drop (dirname file)
-+                                           (string-length path)))
-+                 (module-root (filter-map (match-lambda
-+                                           ("" #f)
-+                                           (a a))
-+                                          (string-split module-root #\/))))
-+            (define (make-module path)
-+              (let* ((name (string-join (append module-root (list (string-drop-right (basename path) (string-length ".c")))) "_"))
-+                     (name (replace "-" "_" name)))
-+                (Module name path excludes)))
-+            (if (string-suffix? ".c" file)
-+                (let ((module (make-module file)))
-+                  (if module
-+                      (cons module result)
-+                      result))
-+                result)))
-+        (define (down dir stat result)
-+          result)
-+        (define (up file state result)
-+          result)
-+        (define skip (const #f))
-+        (file-system-fold enter? leaf down up skip error '() path))
-+
-+    (define (CallbacksTemplate module)
-+      (string-append "static const struct clar_func _clar_cb_"
-+                     (assoc-ref module "name") "[] = {\n"
-+                     (string-join (map render-callback
-+                                       (assoc-ref module "callbacks"))
-+                                  ",\n")
-+                     "\n};\n"))
-+
-+    (define (DeclarationTemplate module)
-+      (string-append (string-join (map (lambda (cb)
-+                                         (string-append "extern "
-+                                                        (assoc-ref cb "declaration")
-+                                                        ";"))
-+                                       (assoc-ref module "callbacks"))
-+                                  "\n")
-+                     "\n"
-+                     (if (assoc-ref module "initialize")
-+                         (string-append "extern " (assoc-ref (assoc-ref module "initialize") "declaration") ";\n")
-+                         "")
-+                     (if (assoc-ref module "cleanup")
-+                         (string-append "extern " (assoc-ref (assoc-ref module "cleanup") "declaration") ";\n")
-+                         "")))
-+
-+    (define (InfoTemplate module)
-+      (string-append "
-+    {
-+        \"" (assoc-ref module "clean-name") "\",
-+    " (render-callback (assoc-ref module "initialize")) ",
-+    " (render-callback (assoc-ref module "cleanup")) ",
-+        _clar_cb_" (assoc-ref module "name") ", "
-+        (number->string (length (assoc-ref module "callbacks")))
-+        ", " (assoc-ref module "enabled") "
-+    }"))
-+
-+    (define (Write data)
-+      (define (name< module-a module-b)
-+        (string<? (assoc-ref module-a "name")
-+                  (assoc-ref module-b "name")))
-+      (define modules (sort (load) name<))
-+
-+      (define (suite-count)
-+        (length modules))
-+
-+      (define (callback-count)
-+        (fold + 0 (map (lambda (entry)
-+                         (length (assoc-ref entry "callbacks")))
-+                         modules)))
-+
-+      (define (display-x value)
-+        (display value data))
-+
-+      (for-each (compose display-x DeclarationTemplate) modules)
-+      (for-each (compose display-x CallbacksTemplate) modules)
-+
-+      (display-x "static struct clar_suite _clar_suites[] = {")
-+      (display-x (string-join (map InfoTemplate modules) ","))
-+      (display-x "\n};\n")
-+
-+      (let ((suite-count-str (number->string (suite-count)))
-+            (callback-count-str (number->string (callback-count))))
-+        (display-x "static const size_t _clar_suite_count = ")
-+        (display-x suite-count-str)
-+        (display-x ";\n")
-+
-+        (display-x "static const size_t _clar_callback_count = ")
-+        (display-x callback-count-str)
-+        (display-x ";\n")
-+
-+        (display (string-append "Written `clar.suite` ("
-+                                callback-count-str
-+                                " tests in "
-+                                suite-count-str
-+                                " suites)"))
-+        (newline))
-+      #t)
-+
-+    (call-with-output-file (string-append output "/clar.suite") Write))
-+
-+;;; main
-+
-+(define (main)
-+  (define option-spec
-+    '((force (single-char #\f) (value #f))
-+      (exclude (single-char #\x) (value #t))
-+      (output (single-char #\o) (value #t))
-+      (help  (single-char #\h) (value #f))))
-+
-+  (define options (getopt-long (command-line) option-spec #:stop-at-first-non-option #t))
-+  (define args (reverse (option-ref options '() '())))
-+  (when (> (length args) 1)
-+    (display "More than one path given\n")
-+    (exit 1))
-+
-+  (if (< (length args) 1)
-+      (set! args '(".")))
-+
-+  (let* ((path (car args))
-+         (output (option-ref options 'output path))
-+         (excluded (filter-map (match-lambda
-+                                (('exclude . value) value)
-+                                (_ #f))
-+                               options)))
-+    (generate-TestSuite path output excluded)))
-+
-+(main)
diff --git a/gnu/packages/version-control.scm b/gnu/packages/version-control.scm
index a8cb4cc347..514dfe7ab7 100644
--- a/gnu/packages/version-control.scm
+++ b/gnu/packages/version-control.scm
@@ -15,7 +15,7 @@
 ;;; Copyright © 2017 Vasile Dumitrascu <va511e@yahoo.com>
 ;;; Copyright © 2017 Clément Lassieur <clement@lassieur.org>
 ;;; Copyright © 2017 André <eu@euandre.org>
-;;; Copyright © 2017, 2018 Marius Bakke <mbakke@fastmail.com>
+;;; Copyright © 2017, 2018, 2020 Marius Bakke <mbakke@fastmail.com>
 ;;; Copyright © 2017 Stefan Reichör <stefan@xsteve.at>
 ;;; Copyright © 2017 Oleg Pykhalov <go.wigust@gmail.com>
 ;;; Copyright © 2018 Sou Bunnbu <iyzsong@member.fsf.org>
@@ -534,7 +534,7 @@ everything from small to very large projects with speed and efficiency.")
 (define-public libgit2
   (package
     (name "libgit2")
-    (version "0.28.4")
+    (version "0.99.0")
     (source (origin
               (method git-fetch)
               (uri (git-reference
@@ -543,21 +543,37 @@ everything from small to very large projects with speed and efficiency.")
               (file-name (git-file-name name version))
               (sha256
                (base32
-                "171b25aym4q88bidc4c76y4l6jmdwifm3q9zjqsll0wjhlkycfy1"))
-              (patches (search-patches "libgit2-avoid-python.patch"
-                                       "libgit2-mtime-0.patch"))
+                "0qxzv49ip378g1n7hrbifb9c6pys2kj1hnxcafmbb94gj3pgd9kg"))
+              (patches (search-patches "libgit2-mtime-0.patch"))
 
-              ;; Remove bundled software.
+              ;; Remove bundled software.  Keep "http-parser" because it
+              ;; contains patches that are not available in the system version.
               (snippet '(begin
-                          (delete-file-recursively "deps")
+                          (with-directory-excursion "deps"
+                            (for-each (lambda (dir)
+                                        (delete-file-recursively dir))
+                                      (lset-difference equal?
+                                                       (scandir ".")
+                                                       '("." ".." "http-parser"))))
                           #t))
-              (modules '((guix build utils)))))
+              (modules '((guix build utils)
+                         (srfi srfi-1)
+                         (ice-9 ftw)))))
     (build-system cmake-build-system)
     (outputs '("out" "debug"))
     (arguments
-     `(#:configure-flags '("-DUSE_SHA1DC=ON") ; SHA-1 collision detection
+     `(#:configure-flags '("-DUSE_NTLMCLIENT=OFF" ;TODO: package this
+                           "-DREGEX_BACKEND=pcre2")
        #:phases
        (modify-phases %standard-phases
+         (add-after 'unpack 'fix-pcre2-reference
+           (lambda _
+             ;; Use PCRE2 with 8-bit character support, as there is no "libpcre2.pc".
+             ;; See <https://github.com/libgit2/libgit2/issues/5438>.
+             (substitute* "src/CMakeLists.txt"
+               (("\"libpcre2\"")
+                "\"libpcre2-8\""))
+             #t))
          (add-after 'unpack 'fix-hardcoded-paths
            (lambda _
              (substitute* "tests/repo/init.c"
@@ -574,14 +590,14 @@ everything from small to very large projects with speed and efficiency.")
          (replace 'check
            (lambda _ (invoke "./libgit2_clar" "-v" "-Q"))))))
     (inputs
-     `(("libssh2" ,libssh2)
-       ("http-parser" ,http-parser)))
+     `(("libssh2" ,libssh2)))
     (native-inputs
-     `(("guile" ,guile-2.2)
-       ("pkg-config" ,pkg-config)))
+     `(("pkg-config" ,pkg-config)
+       ("python" ,python)))
     (propagated-inputs
-     ;; These two libraries are in 'Requires.private' in libgit2.pc.
+     ;; These libraries are in 'Requires.private' in libgit2.pc.
      `(("openssl" ,openssl)
+       ("pcre2" ,pcre2)
        ("zlib" ,zlib)))
     (home-page "https://libgit2.github.com/")
     (synopsis "Library providing Git core methods")