Man1 - perlsynology.1perl

DSM 5

As DSM is a trimmed-down Linux system, it lacks many of the tools and libraries commonly found on Linux. The basic tools like sh, cp, rm, etc. are implemented using BusyBox https://en.wikipedia.org/wiki/BusyBox.

• Using your favourite browser open the DSM management page and start the Package Center.
• If you want to smoke test Perl, install Perl.
• In Settings, add the following Package Sources: https://www.cphub.net http://packages.quadrat4.de
• Still in Settings, in Channel Update, select Beta Channel.
• Press Refresh. In the left panel the item Community will appear. Click it. Select Bootstrap Installer Beta and install it.
• Likewise, install iPKGui Beta. The application window should now show an icon for iPKGui.
• Start iPKGui. Install the packages make, gcc and coreutils. If you want to smoke test Perl, install patch.

The next step is to add some symlinks to system libraries. For example, the development software expect a library libm.so that normally is a symlink to libm.so.6. Synology only provides the latter and not the symlink.

Here the actual architecture of the Synology system matters. You have to find out where the gcc libraries have been installed. Look in /opt for a directory similar to arm-none-linux-gnueab or powerpc-linux-gnuspe. In the instructions below I’ll use powerpc-linux-gnuspe as an example.

• On the DSM management page start the Control Panel.
• Click Terminal, and enable SSH service.
• Close Terminal and the Control Panel.
• Open a shell on the Synology using ssh and become root.
• Execute the following commands: cd /lib ln -s libm.so.6 libm.so ln -s libcrypt.so.1 libcrypt.so ln -s libdl.so.2 libdl.so cd /opt/powerpc-linux-gnuspe/lib (or /opt/arm-none-linux-gnueabi/lib) ln -s /lib/libdl.so.2 libdl.so

WARNING: When you perform a system software upgrade, these links will disappear and need to be re-established.

DSM 6

Using iPkg has been deprecated on DSM 6, but an alternative is available for DSM 6: entware/opkg. For instructions on how to use that, please read Install Entware-ng on Synology NAS https://github.com/Entware-ng/Entware-ng/wiki/Install-on-Synology-NAS

That sadly does not (yet) work on QorIQ. At the moment of writing, the supported architectures are armv5, armv7, mipsel, wl500g, x86_32, and x86_64. Check here https://pkg.entware.net/binaries/ for supported platforms.

Entware-ng comes with a precompiled 5.24.1 (June 2017) that allowes building shared XS code. Note that this installation does not use a site_perl folder. The available cpan works. If all required development packages are installed too, also for XS.

When the build environment has been set up, building and testing Perl is straightforward. The only thing you need to do is download the sources as usual, and add a file Policy.sh as follows:

tree in /opt/perl instead of /opt/bin. prefix=/opt/perl # Select the compiler. Note that there is no cc alias or link. cc=gcc # Build flags. ccflags=“-DDEBUGGING” # Library and include paths. libpth=“/lib” locincpth=“/opt/include” loclibpth=“/lib”

You may want to create the destination directory and give it the right permissions before installing, thus eliminating the need to build Perl as a super user.

In the directory where you unpacked the sources, issue the familiar commands:

./Configure -des make make test make install

Configure

No known problems yet

Build

Error message “No error definitions found”.

This error is generated when it is not possible to find the local definitions for error codes, due to the uncommon structure of the Synology file system. This error was fixed in the Perl development git for version 5.19, commit 7a8f1212e5482613c8a5b0402528e3105b26ff24.

Failing tests

ext/DynaLoader/t/DynaLoader.t

One subtest fails due to the uncommon structure of the Synology file system. The file /lib/glibc.so is missing. WARNING: Do not symlink /lib/glibc.so.6 to /lib/glibc.so or some system components will start to fail.

If building completes successfully, you can set up smoke testing as described in the Test::Smoke documentation.

For smoke testing you need a running Perl. You can either install the Synology supplied package for Perl 5.8.6, or build and install your own, much more recent version.

Note that I could not run successful smokes when initiated by the Synology Task Scheduler. I resorted to initiating the smokes via a cron job run on another system, using ssh:

ssh nas1 wrk/Test-Smoke/smoke/smokecurrent.sh

Local patches

When local patches are applied with smoke testing, the test driver will automatically request regeneration of certain tables after the patches are applied. The Synology supplied Perl 5.8.6 (at least on the DS413) is NOT capable of generating these tables. It will generate opcodes with bogus values, causing the build to fail.

You can prevent regeneration by adding the setting

flags => 0,

to the smoke config, or by adding another patch that inserts

exit 0 if $] == 5.008006;

in the beginning of the regen.pl program.

The above procedure describes a basic environment and hence results in a basic Perl. If you want to add additional libraries to Perl, you may need some extra settings.

For example, the basic Perl does not have any of the DB libraries (db, dbm, ndbm, gdsm). You can add these using iPKGui, however, you need to set environment variable LD_LIBRARY_PATH to the appropriate value:

LD_LIBRARY_PATH=/lib:/opt/lib export LD_LIBRARY_PATH

This setting needs to be in effect while Perl is built, but also when the programs are run.