How to register my own packages or classes in a separate drive to TeX Live installation?

Question

I create my own documentclasses and packages in some directory of tex\latex. The directory tex\latex itself might be in any other directory in any drive. I can register the packages/classes to Miktex as already posted in my answer here. Putting the documentclass or packages in a dedicated directory in a separate drive is practically useful to avoid data loss when the system crashes.

But how to do this for TeX Live?

---

Based on Ulrike's answer I do the following steps and it works.

Step 1

Open C:\texlive\2010\texmf\web2c\texmf.cnf to see how TEXMFLOCAL is defined.

% .... other settings before this line have been removed for simplicity. 
%
% A place for local additions to a "standard" texmf tree.
% This tree is not used for local configuration maintained by
% texconfig, it uses TEXMFCONFIG below.
TEXMFLOCAL = $SELFAUTOPARENT/../texmf-local
%
% .... other settings after this line have been removed for simplicity. 

Step 2

Open C:\texlive\2010\texmf.cnf and modify it as follows.

% (Public domain.)
% This texmf.cnf file should contain only your personal changes from the
% original texmf.cnf (for example, as chosen in the installer).
%
% That is, if you need to make changes to texmf.cnf, put your custom
% settings in this file, which is .../texlive/YYYY/texmf.cnf, rather than
% the distributed file (which is .../texlive/YYYY/texmf/web2c/texmf.cnf).
% And include *only* your changed values, not a copy of the whole thing!
%
OSFONTDIR = $SystemRoot/fonts//
%============== Below this row is my modification ====================
%
% My custom packages and classes are
% in E:/A/My LaTeX/MyLibrary/tex/latex/misc.
%
TEXMFLOCAL = $SELFAUTOPARENT/../texmf-local,E:/A/My LaTeX/MyLibrary
%
%
% It is wrong if you do like below
% TEXMFLOCAL = $SELFAUTOPARENT/../texmf-local,E:/A/My LaTeX/MyLibrary/tex/latex/misc
% or
%TEXMFLOCAL = $SELFAUTOPARENT/../texmf-local,E:/A/My LaTeX/MyLibrary% comments

Packages and classes must be in some subdirectory of tex\latex. In my example above, they are in E:/A/My LaTeX/MyLibrary/tex/latex/misc directory. I am not sure spaces in the path still work in OS other than Windows.

Step 3

Invoke texhash as follows.

Step 4

Done. Congratulation.

Old comments below this question should be removed because they might be no longer relevant to this final edit.

Answer 1

OK. At request I sum up my comments as an answer:

I don't have a full TeX Live but I have a skeleton (for LuaTeX). I have added various texmf trees (e.g. from MiKTeX) from various drives to texmf.cnf and it works fine. The syntax I used is

 TEXMFLOCAL = I:/TeX-Roots/microtype,I:/TeX-Roots/UFlocaltexmf,...

(commas between the roots, no slashes at the end, no comma at the end, the ... stand for more pathes).

The variable TEXMFLOCAL is then used later on in my (complete) texmf.cnf like this:

TEXMF = {!!$TEXMFMAIN,!!$TEXMFLOCAL, ...}

Normally TEXMF should already have this definition in the global texmf.cnf so it shouldn't be necessary to reset it in the local texmf.cnf. kpathsea reads all texmf.cnf. Settings in earlier (local) ones wins.

You should check if you didn't loose the texmf trees from the original TEXMFLOCAL definition (perhaps it did contains something before).

Check the list of pathes/texmf.cnf with kpsewhich -show-path=cnf or (according mpg) kpsewhich -a texmf.cnf.

If you have a MiKTeX installation, check that you are not using its texhash (try texhash --version).

Answer 2

With a default TeXLive installation you have a directory c:\texlive\texmf-local. There you can save your own files. This local directory has the same subdirectories as the default main one. LaTeX files should be saved in texmf-local\tex\latex\.... After saving your files run as command texhash to update the data base.

Answer 3

You can easily add package directories which reside outside the c:/texlive directory. Just append them, separated by ;, to the TEXMFLOCAL variable in the configuration file c:/texlive/texmf.cnf of your installation and run the texhash command. This will add all files found to the file name data base.

EDIT: Here is my texmf.cnf:

% (Public domain.)
% This texmf.cnf file should contain only your personal changes from the
% original texmf.cnf (for example, as chosen in the installer).
%
% That is, if you need to make changes to texmf.cnf, put your custom
% settings in this file, which is .../texlive/YYYY/texmf.cnf, rather than
% the distributed file (which is .../texlive/YYYY/texmf/web2c/texmf.cnf).
% And include *only* your changed values, not a copy of the whole thing!
%
TEXMFLOCAL = $SELFAUTOPARENT/texmf-local;/home/grahn/texpkgs
TEXMFHOME = $TEXMFLOCAL
TEXMFVAR = $TEXMFSYSVAR
TEXMFCONFIG = $TEXMFSYSCONFIG
ASYMPTOTE_HOME = $TEXMFCONFIG/asymptote
TEXINPUTS=.//;
main_memory = 30000000

As far as I know, this file was installed during TeXLive installation (I was using the --portable option). The additions I did are the TEXINPUTS and main_memory lines and the additional directory in TEXMFLOCAL for illustration. Always use / in paths (even for Windows). TEXINPUTS=.//; lets TeX search for files in subdirectories of the current one.

Answer 4

As already mentioned by @mpg, there are 2 texmf.cnf files. The one with a shorter path is for user-defined settings. The other one with a longer path is for factory-default settings and should not be edited by users.

However, in my experience, the user-defined texmf.cnf seems to be ignored or its settings do not affect anything even though you invoke texhash after editing it. That is why I always edit the factory-default texmf.cnf file.

Open the factory-default texmf.cnf, locate TEXMFLOCAL = $SELFAUTOPARENT/../texmf-local, and append ;E:/A/My LaTeX/MyLibrary. So it becomes

TEXMFLOCAL = $SELFAUTOPARENT/../texmf-local;E:/A/My LaTeX/MyLibrary

Finally invoke texhash.

Note that you have to change \ to / and use ; as appending delimiter. When you update your TeXLive installation then redo this ritual because factory-default texmf.cnf will be reset to its default settings.