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The parent environment might contain nasty things. Create a new
environment for the seatd process containing only the environment
variables we care about. For now, that's only SEATD_LOGLEVEL.
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We previously used execlp to execute seatd, which had the effect of
searching PATH for the executable. This allowed the caller to control
what executable was run, which is bad if SUID has been set.
Instead, expose the absolute install path for seatd from meason as a
define, and use that in a call to execv.
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Makes it easier to find out that something went wrong.
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Mimick shells and exit with a status >128 if our child has been
signalled. Exiting with 128 + signal number is what most shells do
(POSIX only requires them to exit with >128).
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The command indexing had not been updated afer the introduction of
getopt, so combining a command with flags would fail.
Add error handling for if no command was specified while we're at it.
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$ seatd-launch sway -c /dev/null
Could not start target: No such file or directory
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Instead of relying on seatd's user/group arguments, which require
turning our UID back into a username, just chmod/chown the socket
ourselves once seatd is ready.
We also reduce the permissions to just user access, instead of user and
group like seatd specifies.
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While forked (child pid is zero), don't use gotos. These will
execute atexit functions and potentially mess up the stdlib.
Instead, use _exit.
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When the child process exits with a non-zero code or is killed,
return with a non-zero code as well.
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This launch wrapper is used to conveniently start a new seatd instance,
wait for it to be ready, and launch a target application.
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