How to properly escape weird characters in paths to have a valid filelist?

[Miro Hrončok <mhroncok@xxxxxxxxxx>]

Hello,

we have a filelist generator and recently I've discovered a bug when the path 
contains a space. Our generator generates one path fer line in a text file that 
is to be used via %file -f.


Suppose the path is:

/usr/share/data/filename with spaces in it

In that case, when we literally include this line in the filelist, RPM says 
that "with", "spaces", "in" and "it" does not start with "/".

Quite easily I was able to find out that we need to write the path like this:

"/usr/share/data/filename with spaces in it"

That works, so I was about to write a function (in Python) that puts the entire 
path in "double quotes" if it contains some space characters (spaces, new 
lines, etc.).

However, I have trouble figuring out how to properly escape a path like this:

/usr/share/data/filename with spaces and "quotes" in it

I've tried the following options with no luck:

'/usr/share/data/filename with spaces and "quotes" in it'
"/usr/share/data/filename with spaces and \"quotes\" in it"
"/usr/share/data/filename with spaces and \\"quotes\\" in it"
"/usr/share/data/filename with spaces and \\\"quotes\\\" in it"

While at it, I've also tried to figure out how to escape a % symbol in path. 
Suppose the path is literally:

/usr/share/data/%version

I've tried the following options with no luck:

"/usr/share/data/%version"
/usr/share/data/%%version
/usr/share/data/%%%version
/usr/share/data/%%%%version
/usr/share/data/%%%%%version ...



This is my function so far, but it is quite incomplete:

import string

def escape_rpm_path(path):
    """
    Escape special characters in paths
    E.g. a space in path otherwise makes RPM think it's multiple paths,
    unless we put it in "quotes".
    Or a literal % symbol in path might be expanded as a macro if not escaped.
    """
    if "%" in path:
        # path = path.replace("%", "%%") is not enough
        raise NotImplementedError("% symbol in paths, dunno")

    if any(symbol in path for symbol in string.whitespace):
        if '"' in path:
            raise NotImplementedError('" symbol in path with spaces, dunno')
        return f'"{path}"'

    # I wish all paths in the world would end up here:
    return path


What do I do? Is there a specification for the filelist syntax somewhere?


Thanks,
--
Miro Hrončok
--
Phone: +420777974800
IRC: mhroncok

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