(address . guix-patches@gnu.org)
71fbbaa57a2c1dba8f0d956ea162c2e15d332e0c.camel@planete-kraus.eu
Hello,
Here is jsonnet. I don’t fully understand what it does, but thanks to
leoprikler, I know it is a dependency to package GraalJS, an
interpreter for JavaScript on the Java Virtual Machine.
For the sake of having "no dependencies", it bundles a custom
implementation of MD5. According to a comment in the associated
license, it is taken from the implementation of bzflag, but it does not
seem to use the same as of today.
I decided to use nettle, and add a few lines of C++ to shape it into
the required interface.
Best regards,
Vivien
From 7cfbec67974d03c6e7dd56e4e2ade95f38faad6a Mon Sep 17 00:00:00 2001
From: Vivien Kraus <vivien@planete-kraus.eu>
Date: Mon, 2 Aug 2021 16:07:08 +0200
Subject: [PATCH] gnu: Add jsonnet.
* gnu/packages/cpp.scm (jsonnet): New variable.
---
gnu/packages/cpp.scm | 103 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 103 insertions(+)
Toggle diff (120 lines)
diff --git a/gnu/packages/cpp.scm b/gnu/packages/cpp.scm
index 42e9d50687..4e51c4a0cc 100644
--- a/gnu/packages/cpp.scm
+++ b/gnu/packages/cpp.scm
@@ -63,6 +63,7 @@
#:use-module (gnu packages llvm)
#:use-module (gnu packages logging)
#:use-module (gnu packages maths)
+ #:use-module (gnu packages nettle)
#:use-module (gnu packages onc-rpc)
#:use-module (gnu packages perl)
#:use-module (gnu packages pkg-config)
@@ -1211,3 +1212,105 @@ of reading and writing XML.")
;; incompatible with the GPL v2. Refer to the file named FLOSSE for the
;; details.
(license license:gpl2+)))
+
+(define-public jsonnet
+ (package
+ (name "jsonnet")
+ (version "0.17.0")
+ (source
+ (origin
+ (method git-fetch)
+ (uri (git-reference
+ (url "https://github.com/google/jsonnet")
+ (commit (string-append "v" version))))
+ (file-name (git-file-name name version))
+ (sha256
+ (base32 "1ddz14699v5lqx3dh0mb7hfffr6fk5zhmzn3z8yxkqqvriqnciim"))
+ (modules '((guix build utils)))
+ (snippet
+ '(begin
+ (delete-file-recursively "third_party")
+ (delete-file-recursively "doc/third_party")
+ (substitute*
+ '("core/vm.cpp")
+ (("#include \"json.hpp\"") "#include <nlohmann/json.hpp>"))
+ (mkdir-p "third_party/md5")
+ (call-with-output-file "third_party/md5/CMakeLists.txt"
+ (lambda (port)
+ (format port "add_library(md5 STATIC md5.cpp md5.h)
+find_package(PkgConfig REQUIRED)
+pkg_check_modules(NETTLE REQUIRED nettle)
+target_link_libraries(md5 ${NETTLE_LIBRARIES})
+target_include_directories(md5 PUBLIC ${NETTLE_INCLUDE_DIRS})
+")))
+ (call-with-output-file "third_party/md5/md5.h"
+ (lambda (port)
+ (format port "#ifndef BZF_MD5_H
+#define BZF_MD5_H
+#include <string>
+
+// Return the hexadecimal digest.
+std::string md5 (const std::string str);
+
+#endif
+")))
+ (call-with-output-file "third_party/md5/md5.cpp"
+ (lambda (port)
+ (format port "#include \"md5.h\"
+#include <nettle/md5.h>
+#include <nettle/base16.h>
+#include <string>
+#include <vector>
+
+#define OUTPUT_LENGTH BASE16_ENCODE_LENGTH (MD5_DIGEST_SIZE)
+
+std::string
+md5 (const std::string str)
+{
+ // Convert str to a byte array
+ std::vector<uint8_t> input (str.begin (), str.end ());
+
+ // Compute the digest
+ struct md5_ctx nettle_ctx;
+ md5_init (&nettle_ctx);
+ md5_update (&nettle_ctx, input.size (), input.data ());
+ uint8_t digest[MD5_DIGEST_SIZE];
+ md5_digest (&nettle_ctx, MD5_DIGEST_SIZE, digest);
+
+ // Encode it to base16
+ std::vector<char> encoded (BASE16_ENCODE_LENGTH (MD5_DIGEST_SIZE));
+ base16_encode_update (encoded.data (), MD5_DIGEST_SIZE, digest);
+ std::string final_digest (encoded.begin (), encoded.end ());
+ return final_digest;
+}
+")))))))
+ (build-system cmake-build-system)
+ (arguments
+ `(#:configure-flags '("-DUSE_SYSTEM_GTEST=ON" "-DUSE_SYSTEM_JSON=ON")))
+ (propagated-inputs
+ '())
+ (native-inputs
+ `(("googletest" ,googletest)
+ ("pkg-config" ,pkg-config)))
+ (inputs
+ `(("json-modern-cxx" ,json-modern-cxx)
+ ;; jsonnet uses a md5 implementation claiming to be from
+ ;; https://www.bzflag.org/, but they don’t use it anymore. We
+ ;; replace it with md5 from nettle.
+ ("nettle" ,nettle)))
+ (home-page "https://jsonnet.org/")
+ (synopsis "The data templating language")
+ (description "A data templating language for app and tool developers:
+- Generate config data
+- Side-effect free
+- Organize, simplify, unify
+- Manage sprawling config
+
+A simple extension of JSON
+- Open source (Apache 2.0)
+- Familiar syntax
+- Reformatter, linter
+- Editor & IDE integrations
+- Formally specified
+")
+ (license license:asl2.0)))
--
2.32.0