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slave: unset TERM_PROGRAM{,_VERSION}

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Foot’s policy is to not set environment variables that identifies
it (except the well-known and established `TERM` variable).

We encourage applications to use terminfo to determine capabilities,
or terminal queries, when available. Or, at least use terminal queries
to detect the terminal and its version.

Setting environment variables is a bad idea since they are inherited
by all applications started by the terminal (which is the whole
point). But, this includes other terminal emulators, making it very
possible a terminal emulator gets mis-detected just because it was
started from another terminal.

Since there are a couple of terminal emulators that _do_ set
TERM_PROGRAM and TERM_PROGRAM_VERSION, unset these environment
variables to avoid being misdetected.

Closes #1349
This commit is contained in:
Daniel Eklöf 2023-05-12 14:55:55 +02:00
parent d2f81443f1
commit a2f765b72a
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5 changed files with 4 additions and 27 deletions
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CHANGELOG.md
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@ -93,7 +93,7 @@
* “Report DA2” terminfo entries (`RV`/`rv`).
* `XF` terminfo capability (focus in/out events available).
* `$TERM_PROGRAM` and `$TERM_PROGRAM_VERSION` environment variables
set in the slave process.
unset in the slave process.
[1136]: https://codeberg.org/dnkl/foot/issues/1136
[1225]: https://codeberg.org/dnkl/foot/issues/1225