On Sunday, December 13, 2015 at 10:20:00 AM UTC-6, Vadym Chepkov wrote:
>
> Hi,
>
> I can't figure out how to include a single quoted string into a command,
> not matter what escaping I do.
> Here is a simplified code :
>
> $string = '\'a quoted string\''
>
> exec { 'show string':
> command => "echo \'I want to see ${string}\'",
> logoutput => true,
> path => '/bin:/usr/bin',
> }
>
> Quotes don't show up, no matter what.
> What do I do wrong?
>
The value of variable $string starts and ends with a single quote. These
are retained when you insert it into the Exec's 'command' paramater, so
that there are then four single quotes in that parameter value (and no
backslashes) in that parameter's value. You are using the default provider
for your Exec (probably the 'posix' provider), so this command string ends
up being handed off to Ruby's Kernel.exec(), which under some circumstances
hands it off to the shell, and under other circumstances performs its own
expansions as if by the shell, and executes it directly. So consider what
the shell would do with the resulting command string:
echo 'I want to see 'a quoted string''
It is equivalent to this:
echo "I want to see a" quoted string
And of course, the output is just
I want to see a quoted string
There are several ways to go about what you are after but the bottom line
is that you need to recognize that the strings will be processed at least
twice: once by Puppet, and once by Kernel.exec(), in that order. You need
to insert appropriate escapes or quotes into your command for the latter,
and then escape or quote the result for the former.
For example, you might do this:
$string = "\\'a quoted string\\'"
exec { 'show string':
command => "echo I want to see ${string}",
logoutput => true,
path => '/bin:/usr/bin',
}
That escapes the backslashes so they get passed on to Kernel.exec() or the
shell, and uses double quotes around the value of $string so that the
single quotes within do not need to be escaped for Puppet. There are other
ways to wrangle the details, of course.
John
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