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slave: don't skip setting environment variables when using a custom environment

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When launching footclient with -E,--client-environment the environment
variables that should be set by foot, wasn't.

Those variables are:

* TERM
* COLORTERM
* PWD
* SHELL

and all variables defined by the user in the [environment] section in
foot.ini.

In the same way, we did not *unset* TERM_PROGRAM and
TERM_PROGRAM_VERSION.

This patch fixes it by "cloning" the custom environment, making it
mutable, and then adding/removing the variables above from it.

Instead of calling setenv()/unsetenv() directly, we add the wrapper
functions add_to_env() and del_from_env().

When *not* using a custom environment, they simply call
setenv()/unsetenv().

When we *are* using a custom environment, add_to_env() first loops all
existing variables, looking for a match. If a match is found, it's
updated with the new value. If it's not found, a new entry is added.

del_from_env() loops all entries, and removes it when a match is
found. If no match is found, nothing is done.

The mutable environment is allocated on the heap, but never free:d. We
don't need to free it, since it's only allocated after forking, in the
child process.

Closes #1568
This commit is contained in:
Daniel Eklöf 2024-01-09 16:50:47 +01:00
parent 208008d717
commit 9da7152f83
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8 changed files with 141 additions and 18 deletions
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@ -554,16 +554,31 @@ In all other cases, the exit code is that of the client application
set according to either the *--term* command-line option or the
*term* config option in *foot.ini*(5).
*PWD*
Current working directory (at the time of launching foot)
*COLORTERM*
This variable is set to *truecolor*, to indicate to client
applications that 24-bit RGB colors are supported.
*PWD*
Current working directory (at the time of launching foot)
*SHELL*
Set to the launched shell, if the shell is valid (it is listed in
*/etc/shells*).
In addition to the variables listed above, custom environment
variables may be defined in *foot.ini*(5).
## Variables *unset* in the child process
*TERM_PROGRAM*
*TERM_PROGRAM_VERSION*
These environment variables are set by certain other terminal
emulators. We unset them, to prevent applications from
misdetecting foot.
In addition to the variables listed above, custom environment
variables to unset may be defined in *foot.ini*(5).
# BUGS
Please report bugs to https://codeberg.org/dnkl/foot/issues