Querying and modifying TEXINPUTS from inside a latex file?

Question

If I have images, or files that I \input or \include, I know I can use:

TEXINPUTS=/path/to/extra/dir pdflatex myfile.tex

... to allow Latex to find files not present in subdirectories in the current directory.

But, I'd rather not use TEXINPUTS as an environment variable on the command line - I'd prefer if there was something like a \texinputs macro that I could read or append to from inside Latex, so I could write my file as:

\edef\texinputs{\texinputs:/path/to/extra/dir}
\documentclass{...

... and then just run pdflatex myfile.tex on the command line (and have everything work as expected).

Is there a way to do this in Latex (that is, from inside a .tex file being processed by Latex)? (I'm aware that I could write a shell script, but then I have an additional file to think of; I'm also aware I could use something like arara (?) for this, but let's say I don't have the time at the moment to acquaint myself with a new tool).

Does this help you: http://tex.stackexchange.com/questions/15960/graphicspath-and-include Note that graphicspath exists for exactly this reason with images, the include statement is the "tricky" part. — nickpapior, Jun 17 '15 at 06:35
+1 Oh I would love to have a feature like that. It would solve so many problems in my cross-site, cross-platform and dozen-of-participants projects. — Daniel, Jun 17 '15 at 06:41
thanks @zeroth - not really, as this answer there says, \graphicspath is only for {graphicx}, and does not influence \input, which AFAIK is a tex primitive. Cheers! — sdaau, Jun 17 '15 at 06:49
\graphicspath is only a wrapper around the general \input@path. See http://tex.stackexchange.com/a/241832/2388 — Ulrike Fischer, Jun 17 '15 at 07:32
Thanks, @UlrikeFischer - actually, it looks like that question, Define path for packages in the LaTeX file (analog of \input@path or \graphicspath for \usepackage) does answer my question... but I'll need to test it eventually. cheers! — sdaau, Jun 17 '15 at 07:36
@sdaau the analogue for latex's \input (which isn't primitive) is \input@path in fact \graphicspath just saves a local copy of \input@path to be used by \includegraphics. If you set \input@path before loading graphics then teh same path will be used for tex files and images. — David Carlisle, Jun 17 '15 at 08:04
On the basis of the comments I'm marking this as a dupe: seems that is the best way to answer it. — Joseph Wright, Jul 28 '15 at 05:56

Querying and modifying TEXINPUTS from inside a latex file?

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