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dataMkdir() already picked the appropiate directory so make it
return that such that unveilData() can go as only that one directory
needs unveiling.
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No point in creating (sub)directories when the given root failed already
as is the case when e.g. XDG_DATA_HOME/catgirl/ itself is bogus
(cleaned stderr intermangled with ncurses setup/catgirl output):
$ env -i TERM=xterm XDG_DATA_HOME=/ ./catgirl -h irc.hackint.eu -n nobody -l
catgirl: //catgirl/: Permission denied
catgirl: //catgirl/log: No such file or directory
catgirl: //catgirl/log/hackint: No such file or directory
catgirl: //catgirl/log/hackint/NickServ: No such file or directory
catgirl: //catgirl/: Permission denied
catgirl: //catgirl/log/hackint/NickServ/2021-06-13.log: No such file or directory
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Don't search base directories if path starts with "/", "./" or
"../", but still do if the path simply starts with ".". Bail early
if HOME is needed but unset. Don't attempt to open the original
path in configOpen and dataOpen.
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LibreSSL is "a modified version of that library".
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https://www.gnu.org/licenses/gpl-faq.en.html#GPLIncompatibleLibs
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> When attempting to read a file, if for any reason a file in a certain
> directory is unaccessible, e.g. because the directory is non-existant,
> the file is non-existant or the user is not authorized to open the file,
> then the processing of the file in that directory should be skipped. If
> due to this a required file could not be found at all, the application
> may chose to present an error message to the user.
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The mkdir dance is a bit awkward...
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And add warnings to configOpen, since that's the only way to be accurate
if a weird error occurs.
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