[Scons-users] Chmod fun

[Mats Wichmann]

okay, this was amusing...

Execute(Chmod(ndk_bundle, 'a+x'))

leads to

09:40:32 TypeError: %o format: a number is required, not str:
from (long traceback trimmed):
09:40:32   File "/usr/lib/scons/SCons/Defaults.py", line 177:
09:40:32     return 'Chmod(%s, 0%o)' % (get_paths_str(dest), mode)

scons manpage:

    Returns an Action object that changes the permissions on the
specified dest file or directory to the specified mode which can be
octal or string, similar to the bash command. Examples:

    Execute(Chmod('file', 0755))

    env.Command('foo.out', 'foo.in',
                [Copy('$TARGET', '$SOURCE'),
                 Chmod('$TARGET', 0755)])

    Execute(Chmod('file', "ugo+w"))

    env.Command('foo.out', 'foo.in',
                [Copy('$TARGET', '$SOURCE'),
                 Chmod('$TARGET', "ugo+w")])

linux chmod man:

       The format of a symbolic mode is  [ugoa...][[-+=][perms...]...],
where
       perms  is  either zero or more letters from the set rwxXst, or a
single
       letter from the set ugo.  Multiple symbolic modes can be  given,
sepa‐
       rated by commas.


But it turns out, not 'a' for scons:

permission_dic = {
    'u':{
...
    'g':{
...
    },
    'o':{
...
    }
}


There's not a big complaint here, except that "similar to bash" doesn't
give much detail; I guessed wrong.

FWIW, http://www.scons.org/doc/latest/HTML/scons-user.html does not hint
at the string variant of the mode at all: "The permission argument uses
POSIX-style permission bits and should typically be expressed as an
octal, not decimal, number".