On Mon, Oct 13, 2014 at 1:04 AM, Boylan, Ross <ross.boy...@ucsf.edu> wrote:
> perl -c adduser gives its first error as
> "my" variable $new_uid masks earlier declaration in same scope at adduser
> line 283.
> First, it doesn't seem to me I'm declaring the variable at all at 283. I
> suppose it could be an implicit declaration if there wasn't a previous
> declaration, but there is at 103.
> Second, I don't see any earlier declarations in any scope except the outer
> one.
> Third, the variiable was declared, with "our $new_uid;" much earlier in the
> file.
>
> Could anyone explain to me what's going on? A couple other questions appear
> after the code.
> 32 use warnings;
> 33 use strict;
> 34 use Debian::AdduserCommon;
> 35 use Getopt::Long;
> 36 use File::Spec::Functions;
> 37 use File::Touch;
> ...
> 103 our $new_uid = undef;
> ....
> 160 # Parse options, sanity checks
> 161 unless ( GetOptions ("quiet|q" => sub { $verbose = 0 },
> ...
> 173 "uid=i" => \$new_uid, # still in arguments to GetOptions
> Lines 103 and 173 are the only places $new_uid occurs in the text before line
> 283.
>
> 272 if ($use_template = &use_template) {
> 273 # we are using templates
> 274 if (check_template( $conf_dir, \%template)) {
> 275 merge_template( \%template, \%system)
> 276 }
> 277 # rewrite request as needed
> 278 if defined($new_name) {
> 279 # trying to create a new user
> 280 if (my @old = $$($template{uname}){$new_name}) {
> 281 # requested user is in the template
> 282 my $olduid = $$old[2];
> **283 dief( gtx("Specified UID %d for %s does not match template
> UID of %d.\n"), $new_uid,
> 284 $new_name, $olduid) if defined($new_uid) &&
> $new_uid != $olduid;
> 285 $new_uid = $olduid;
> 286 my $oldgid = $$old[3];
>
> Bonus question #1: Where does the relevant scope start? I think it's 280,
> but if none of the if's create scopes it could be the start of the file.
>
> Bonus question #2: If I change 280 to to "if (my $old = ...." I get the
> error
> "my" variable $old masks earlier declaration in same statement at adduser
> line 282.
> Why? I mean, there's only declaration in the statement, and it seems to be
> on the first line even if the "statement" is everything up to the end of the
> if .. else .. block.
>
> The archives indicate that syntax errors sometimes produce seemingly
> unrelated "masks earlier declaration" errors, but even if this is a syntax
> error (it seems more like a semantic problem to me) the error seems odd.
LIne 280 alone will generate a syntax error:
$ perl -we 'if (my @old = $$($template{uname}){$new_
name}) {}'
syntax error at -e line 1, near "$$("
Perhaps you meant somethng like:
if (my @old = ( ${$template{uname}{$new_name}} ) ) { .... }
But that's really bizarre too. Did you really intend to declare and
populate an array and throw in a conditional all in a one-liner?
Do you know for instance that my @foo = $some_scalar is the equivalent
of just saying: my @foo = ($some_scalar).
So, just a few thoughts... some more explanation of what that code is
intended to do would help.
--
Charles DeRykus
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