Basics
Starting with version 1.0.1
, it is possible to build a
liquidsoap binary that can load all its dependencies from any arbitrary
path. This is very useful to distribute a liquidsoap bundled binary,
independent of the distribution used.
You can enable custom path at configure time, by passing the
--enable-custom-path
configuration option. A custom loading
path is a directory that contains the following file/directories:
./camomile
: Camomile shared data. They are usually located in/usr/(local/)share/camomile
./libs
: pervasive scripts. Their are located inliquidsoap/scripts
in liquidsoap’s sources./log
: default log directories./magic
: directory for magic files. See below for more details../plugins
: default plugins directory (most likely empty)./run
: default runtime files directory
Adding liquidsoap binary
In order to ship a liquidsoap binary which is independent of the distribution it will be run on, one need to also include its dynamic libraries, except for the most common. The following command may be used to list them:
ldd ./liquidsoap | grep usr | cut -d' ' -f 3
Those libraries are usually copied into a ./ld
directory. Then, the LD_LIBRARY_PATH
is used to point the
dynamic loader to this directory.
Finally, the liquidsoap
library is usually added in
./bin/liquidsoap
Configuration variables
In the following, configuration variables may refer to either
absolute or relative paths. If referring to a relative path, the path is
resolved relatively to the directory where the liquidsoap
binary is located at.
In order to tell liquidsoap where its custom path is located, you
need to set the LIQUIDSOAP_BASE_DIR
.
Another important variable is MAGIC
. It tells liquidsoap
where to load the libmagic’s definitions and defaults to
../magic/magic.mgc
. Older versions of libmagic may require
to use magic/magic.mime
instead.
Full example
For a fully-functional example, you can check our heroku buildpack. Its layout is:
./bin
./bin/liquidsoap
./camomile
./camomile/charmaps
(...)
./ld
./ld/libao.so.2
(...)
./libs
./libs/externals.liq
(...)
./log
./magic
./magic/magic.mime
./plugins
./run
Its configuration variables are set to:
LD_LIBRARY_PATH=/path/to/ld
LIQUIDSOAP_BASE_DIR=..
MAGIC=../magic/magic.mime
As you can see, we use an old version of libmagic
so we
need to load magic.mime
instead of
magic.mgc
.