Nov 17 2017

Python’s M2Crypto fails to compile

When updating my music server, I ran into a compilation error on Python’s M2Crypto. The error message was a little bit strange and not directly related to the package itself:

fatal error: openssl/ecdsa.h: No such file or directory

Obviously, that error is generated from OpenSSL and not directly within M2Crypto. Remembering that there are some known problems with the “bindist” USE flag, I took a look at OpenSSL and OpenSSH. Indeed, “bindist” was set. Simply removing the USE flag from those two packages took care of the problem:


# grep -i 'openssh\|openssl' /etc/portage/package.use
>=dev-libs/openssl-1.0.2m -bindist
net-misc/openssh -bindist

In this case, the problems makes sense based on the error message. The error indicated that the Elliptic Curve Digital Signature Algorithm (ECDSA) header was not found. In the previously-linked page about the “bindist” USE flag, it clearly states that having bindist set will “Disable/Restrict EC algorithms (as they seem to be patented)”.

Cheers,
Nathan Zachary

Sep 27 2017

Ugly fonts in Mozilla Firefox and Thunderbird under Linux (skia and cairo)

Recently, after updating to Mozilla Firefox to version 52 or later (55.0.2, in my case), and Mozilla Thunderbird to version 52 or later (52.3.0, in my case), I found that fonts were rendering horribly under Linux. It looked essentially like there was no anti-aliasing or hinting at all.

Come to find out, this was due to a change in the content rendering engine, which is briefly mentioned in the release notes for Firefox 52 (but it also applies to Thunderbird). Basically, in Linux, the default engine changed from cairo to Google’s Skia.

Ugly fonts in Firefox and Thunderbird under Linux - skia and cairo

For each application, the easiest method for getting the fonts to render nicely again is to make two changes directly in the configuration editor. To do so in Firefox, simply go to the address bar and type about:config. Within Thunderbird, it can be launched by going to Menu > Preferences > Advanced > Config Editor. Once there, the two keys that need to change are:

gfx.canvas.azure.backends
gfx.content.azure.backends

They likely have values of “skia” or a comma-separated list with “skia” being the first value. On my Linux hosts, I changed the value from skia back to cairo, restarted the applications, and all was again right in the world (or at least in the Mozilla font world 😛 ).

Hope that helps.

Cheers,
Zach

Jul 27 2017

MySQL / MariaDB 10.2 – Can’t find messagefile ‘/usr/share/mysql/errmsg.sys’

Last evening, I ran some updates on one of my servers. One of the updates was from MariaDB 10.1 to 10.2 (some minor release as well). After compiling, I went to restart, but it failed with:

# /etc/init.d/mysql start
* Checking mysqld configuration for mysql ...
[ERROR] Can't find messagefile '/usr/share/mysql/errmsg.sys'
[ERROR] Aborting

* mysql config check failed [ !! ]
* ERROR: mysql failed to start

I’m not sure why this just hit me now, but it looks like it is a function within the init script that’s causing it to look for files in the nonexistent directory of /usr/share/mysql/ instead of the appropriate /usr/share/mariadb/. The fast fix here (so that I could get everything back up and running as quickly as possible) was to simply symlink the directory:

cd /usr/share
ln -s mariadb/ mysql

Thereafter, MariaDB came up without any problem:

# /etc/init.d/mysql start
* Caching service dependencies ... [ ok ]
* Checking mysqld configuration for mysql ... [ ok ]
* Starting mysql ... [ ok ]
# /etc/init.d/mysql status
* status: started

I hope that information helps if you’re in a pinch and run into the same error message.

Cheers,
Zach

UPDATE: It seems as if the default locations for MySQL/MariaDB configurations have changed (in Gentoo). Please see this comment for more information about a supportable fix for this problem moving forward. Thanks to Brian Evans for the information. 🙂

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