Compiling "file" with spksrc for synology NAS

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Read the disclaimer

This article describes how to compile "file" for synology devices, package it and install it.

You can get "file" sources at:
  • https://github.com/file/file
  • ftp://ftp.astron.com/pub/file/
The package described in this guide is will download the content from that repository.

The "file" command is "a file type guesser", that is, a command-line tool that tells you in words what kind of data a file contains.

The original spksrc already contains a file package, that only compiles the binaries :
https://github.com/SynoCommunity/spksrc/tree/master/cross/file
This package fills the gap and provides the command line utilities from the shell:
  • file
This guide is the same that
https://dayandnightcoding.blogspot.com/2020/04/compiling-cpulimit-with-spksrc-for.html
You can follow the different steps there.
I'll document only the steps referring specifically to "file".

Clone the repository and make setup

  • on the ubuntu host
  • start a terminal
  • choose a folder for the git clone root
  • git clone https://github.com/youpla/spksrc.git
  • cd spksrc/
  • make setup

Compile the "file" package for your architecture

in a terminal navigate to the file folder

example:
/home/userprofile/test-git/spksrc/spk/file

make arch-armada375

At the time writing this article I have a Ubuntu 18 with file 5.32.
The spksrc package is file 5.35
The cross compilation fails with this message:
Cannot use the installed version of file (5.32) to
cross-compile file 5.35
Please install file 5.35 locally first

From a console type : file --version
If the version displayed is not the one in the spksrc package, you can apply one of the following workaround.

Workaround 1

Install file 5.35 to your ubuntu system
  1. Uninstall the current package from the console : sudo apt remove file
  2. Download the sources : ftp://ftp.astron.com/pub/file/file-5.35.tar.gz
  3. Download and check the signature : ftp://ftp.astron.com/pub/file/file-5.35.tar.gz.asc
    (see below)
  4. Unpack the file-5.35.tar.gz archive
  5. Navigate to the unpack directory from the console
  6. Follow the installation documentation at : https://github.com/file/file
    1. run the configure script : ./configure
    2. run make : make
    3. run make install as sudo : sudo make install
  7. On ubuntu 18: I also had to correct the libraries.
    1. From a console navigate to : /usr/lib/x86_64-linux-gnu
    2. backup the existing libraries : 
      1. sudo mv libmagic.so* /root/
      2. sudo mv libmagic.la /root/
    3. copy the new ones : 
      1. sudo cp /usr/local/lib/libmagic.la .
      2. sudo cp /usr/local/lib/libmagic.so.1.0.0 .
      3. make the symbolic links : sudo ln -s libmagic.so.1.0.0 libmagic.so
      4. make the symbolic links : sudo ln -s libmagic.so.1.0.0 libmagic.so.1
You can now cross compile the package for your synology.
  1. From the console go back to: /home/userprofile/test-git/spksrc/spk/file
  2. Clean up the last build : make clean
  3. Build again : make arch-armada375

Workaround 2

You can alter the spksrc source you downloaded in order to compile the same version that is already installed on your computer.

  1. edit : /home/userprofile/test-git/spksrc/cross/file/Makefile
    1. change : PKG_VERS = 5.35 to the version on your computer
  2. edit : /home/userprofile/test-git/spksrc/cross/file/digests
    1. you can empty the file. Important : please read "check the checksum" section in this article.
  3. edit : /home/userprofile/test-git/spksrc/spk/file/Makefile
    1. SPK_VERS = 5.35 to the version on your computer

You can now cross compile the package for your synology.
  1. From the console go back to: /home/userprofile/test-git/spksrc/spk/file
  2. Clean up the last build : make clean
  3. Build again : make arch-armada375

Check the checksum

  • If you already run the cross compilation, the archive is in : /home/userprofile/test-git/spksrc/distrib/file-5.35.tar.gz
  • If you did not alter the source file, the checksum has already been performed by the cross compilation script.
  • If you emptied : /home/userprofile/test-git/spksrc/cross/file/digests
  • Then the script did NOT perform a checksum. You have no warranty that the file has not been altered during the transfer.
  • If you downloaded the archive yourself or altered the script you can check the signature following the documentation:
    • https://github.com/file/file
      • gpg --verify file-5.32.tar.gz.asc file-5.32.tar.gz
      • you'll get :
        • gpg: Signature made Sa 02 Sep 2017 11:08:32 CESTgpg:               
          using DSA key 71112AB16CB33B3A
      • gpg --keyserver hkp://keys.gnupg.net --recv-keys 71112AB16CB33B3A
  • You have now checked the file signature.

Install the package

Go to the file explorer and find the generated file.

example
/home/userprofile/test-git/spksrc/packages/file_armada375-6.1_5.35-1.spk

Testing

See :
https://dayandnightcoding.blogspot.com/2020/04/testing-package-compiled-with-spksrc.html

The package "file" has been tested for install and uninstall on my DS-115 with no noticed problem.


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