Replicant » Upstreaming patches

h1. GuixBuildSystem

h2. USe cases

Guix can be used for faster testing:

* It can build software that uses autotools and Android.mk Makefiles

* We might be able to use it to iterate over different Android versions, to test libsamsung-ril changes for various RIL API way faster (without even having to use it in a specific Replicant version, use repo, etc).

* It's more self contained than the whole Replicant source code

TODO:

* Import the compilation flags for various Replicant versions like -Werror -Wnounused to make sure that everything is usable in all Replicant versions.

* Finish packaging libsamsung-ril

* Add more automatic testing either in libsamsung-ipc / libsamsung-ril and or in the unofficial Guix packages.

h2. Implementation

Guix currently uses "android-make-stub":https://github.com/daym/android-make-stub.git to build Android software using Android.mk.

There are some comments in Guix source code that cross compilation isn't supported for the android-ndk build system.

Practically speaking it means that Guix won't be able to build any BUILD_SHARED_LIBRARY, BUILD_SHARED_LIBRARY or BUILD_STATIC_EXECUTABLE, however building the HOST_* counterpart works fine.

To workaround that they simply do replace them in the Android.mk during the build procedude:

* BUILD_SHARED_LIBRARY becomes BUILD_HOST_SHARED_LIBRARY

* BUILD_SHARED_LIBRARY becomes BUILD_HOST_STATIC_LIBRARY

* BUILD_STATIC_EXECUTABLE becomes BUILD_HOST_STATIC_EXECUTABLE

For instance we have:

<pre>

   (arguments

    `(#:phases

      (modify-phases %standard-phases

		     (delete 'bootstrap)

		     (add-before 'build 'patch-host

				 (lambda _

				   ;; TODO: Cross-compile.

				   (substitute* "Android.mk"

						(("BUILD_SHARED_LIBRARY") "BUILD_HOST_SHARED_LIBRARY")

						;; (("BUILD_STATIC_LIBRARY") "BUILD_HOST_STATIC_LIBRARY")

						;; (("BUILD_STATIC_EXECUTABLE") "BUILD_HOST_STATIC_EXECUTABLE")

						)

				   #t))

		     )))

</pre>

Here the (delete 'bootstrap) is because the build is done in several phases, and here the bootstrap phase wasn't overriden by the android-ndk build system yet. As a result it tried to run autogen.sh. That might be because in libsamsung-ipc there is both an android build system and an autotools based one.

h2. Example

<pre>

;;; Copyright © 2020 Denis Carikli <GNUtoo@cyberdimension.org>

;;;

;;; This file is not part of GNU Guix (yet).

;;;

;;; 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 (replicant)

  #:use-module ((guix licenses) #:prefix license:)

  #:use-module (guix packages)

  #:use-module (guix git-download)

  #:use-module (guix build-system android-ndk)

  #:use-module (guix build-system gnu)

  #:use-module (gnu packages android)

  #:use-module (gnu packages autotools)

  #:use-module (gnu packages pkg-config)

  #:use-module (gnu packages tls)

)

(define-public libsamsung-ipc

  (package

   (name "libsamsung-ipc")

   (version "0.1")

   (source

    (origin

     (method git-fetch)

     (uri (git-reference

	   (url "https://git.replicant.us/replicant/hardware_replicant_libsamsung-ipc.git")

	   (commit "73aa86f31bb004c48c5250ea43cca9ed9d51cb17")))

     (file-name (git-file-name name version))

     (sha256 (base32 "1wkvkgbckb7cif6lrd8rivh6s4886qa4dw2s433l28h2lh3zmqkb"))

     )

    )

   (build-system gnu-build-system)

   (native-inputs

    `(("autoreconf" ,autoconf)

      ("aclocal" ,automake)

      ("libtool" ,libtool)

      ("pkgconfig" ,pkg-config)

      ))

   (inputs

    `(("openssl" ,openssl)))

   (synopsis "libsamsung-ipc is a free software implementation of the Samsung IPC modem protocol")

   (description

    "libsamsung-ipc is a free software implementation of the Samsung IPC modem protocol,

found in many Samsung smartphones and tablets.")

   (home-page "https://www.replicant.us")

   (license license:gpl2+)

   )

  )

(define-public libsamsung-ipc-android

  (package

   (name "libsamsung-ipc-android")

   (version "0.1")

   (source

    (origin

     (method git-fetch)

     (uri (git-reference

	   (url "https://git.replicant.us/replicant/hardware_replicant_libsamsung-ipc.git")

	   (commit "73aa86f31bb004c48c5250ea43cca9ed9d51cb17")))

     (file-name (git-file-name name version))

     (sha256 (base32 "1wkvkgbckb7cif6lrd8rivh6s4886qa4dw2s433l28h2lh3zmqkb"))

     )

    )

   (build-system android-ndk-build-system)

   (inputs

    `(("android-libutils" ,android-libutils)

      ("libcrypto" ,openssl)))

   (arguments

    `(#:phases

      (modify-phases %standard-phases

		     (delete 'bootstrap)

		     (add-before 'build 'patch-host

				 (lambda _

				   ;; TODO: Cross-compile.

				   (substitute* "Android.mk"

						(("BUILD_SHARED_LIBRARY") "BUILD_HOST_SHARED_LIBRARY")

						;; (("BUILD_STATIC_LIBRARY") "BUILD_HOST_STATIC_LIBRARY")

						;; (("BUILD_STATIC_EXECUTABLE") "BUILD_HOST_STATIC_EXECUTABLE")

						)

				   #t))

		     )))

   (synopsis "libsamsung-ipc is a free software implementation of the Samsung IPC modem protocol")

   (description

    "libsamsung-ipc is a free software implementation of the Samsung IPC modem protocol,

found in many Samsung smartphones and tablets.")

   (home-page "https://www.replicant.us")

   (license license:gpl2+)

   )

  )

;; TODO: This package doesn't compile yet.

;; To make it compile, we would need to:

;; - patch Guix to change (define android-libcutils to

;;   (define-public android-libcutils and also do the same for android-liblog.

;;   When this is done we can use the following in inputs:

;;   ("android-libcutils" ,android-libcutils)

;;   ("android-liblog" ,android-liblog)

;; - to package libnetutils and libpower

;; - find a way to use headers that are not in LOCAL_SHARED_LIBRARIES like

;;   hardware/libhardware_legacy/include and system/core/include

(define-public libsamsung-ril

  (package

   (name "libsamsung-ril")

   (version "0.1")

   (source

    (origin

     (method git-fetch)

     (uri (git-reference

	   (url "https://git.replicant.us/replicant/hardware_replicant_libsamsung-ril.git")

	   (commit "181d3e2a85dff24552a29a0cecbca9ac78cba5b7")))

     (file-name (git-file-name name version))

     (sha256 (base32 "0sjiw7kp9hipkc9smphbzzbmhyf30y0vni94w15vliry381g5ma8"))

     )

    )

   (build-system android-ndk-build-system)

   (inputs

    `(("android-libutils" ,android-libutils)

      ("libsamsung-ipc", libsamsung-ipc)

      ("libcrypto" ,openssl)))

   (arguments

    `(#:phases

      (modify-phases %standard-phases

		     (delete 'bootstrap)

		     (add-before 'build 'patch-host

				 (lambda _

				   ;; TODO: Cross-compile.

				   (substitute* "Android.mk"

						(("BUILD_SHARED_LIBRARY") "BUILD_HOST_SHARED_LIBRARY"))

				   #t))

		     )))

   (synopsis "libsamsung-ipc is a free software implementation of the Samsung IPC modem protocol")

   (description

    "libril implementation for the Samsung IPC modem protocol, found in many Samsung smartphones and tablets.")

   (home-page "https://www.replicant.us")

   (license license:gpl2+)

   )

  )

</pre>