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This reverts commit 4f80c17192f2b28c96a489969d4435151d68d0ce.
Link: https://www.austingroupbugs.net/view.php?id=1133
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Link: https://www.austingroupbugs.net/view.php?id=1031
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The POSIX Utility Syntax Guidelines specify that flag groups like -HL
should be handled like -H -L. GNU find doesn't support grouping flags
in this way, but BSD find does.
To avoid conflicts with non-flag primaries, for now we require at least
one flag in a group to be a capital letter. That is, we support things
like -Lds but not -ds. We also do not support -fPATH (without a space)
as it would conflict with -follow, -fprint, etc. It is impossible to be
compatible with both GNU and BSD find here:
user@gnu$ find -follow
link
link/file
...
user@bsd$ find -follow
find: ollow: No such file or directory
Link: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap12.html
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Rather than attempting to close any unexpected FDs, just count them and
adjust our ulimit -n calls to account for them.
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This bug could be reproduced with something like
$ bfs -samefile $'\xFA\xFA'
bfs: error: bfs: dstrnescat@src/dstring.c:252: wordesc() result truncated
or worse, with -DNDEBUG,
$ bfs -samefile $'.....................\xFA\xFA'
bfs: error: bfs -samefile $'.....................\xFA\xFA\x00\x55\x53\x45\x52\x3D\x74\x61\x76\x69\x61\x6E\x61\x74\x6F\x72
bfs: error: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
bfs: error: No such file or directory.
which prints the memory after the end of the string (in this case, the
environment variable USER=tavianator).
The bug was caused by the line `*i += len`, which was intended to be
`*i = len`. But actually, the right behaviour seems to be `*i += 1`.
Fixes: 19c96abe0a1ee56cf206fd5e87defb1fd3e0daa5
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Otherwise, propagate the exit code from bfs
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POSIX touch(1) doesn't include the -h option, and indeed OpenBSD doesn't
implement it. Making our own utility also lets us add some handy
extensions like -p (create parents) and -M (set permissions).
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And try to unmount things if the a test left them mounted.
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