missing perl directories

missing perl directories

[Anthony Heading]

Hi,

Whenever I have a new cygwin setup,  I get an error/warning when trying to install perl modules:

% cpan install Win32::Symlink
Loading internal logger. Log::Log4perl recommended for better logging
[...]
Use of uninitialized value $what in concatenation (.) or string at /usr/share/perl5/5.30/App/Cpan.pm line 679, <STDIN> line 1.
Warning: You do not have write permission for Perl library directories.

I think it is just because the site_perl directories do not exist.

% perl -V
Summary of my perl5 (revision 5 version 30 subversion 3) configuration:
[...]
  @INC:
    /usr/local/lib/perl5/site_perl/5.30/x86_64-cygwin-threads
    /usr/local/share/perl5/site_perl/5.30
    /usr/lib/perl5/vendor_perl/5.30/x86_64-cygwin-threads
    /usr/share/perl5/vendor_perl/5.30
    /usr/lib/perl5/5.30/x86_64-cygwin-threads
    /usr/share/perl5/5.30

ls: cannot access '/usr/local/lib/perl5/site_perl/5.30/x86_64-cygwin-threads': No such file or directory
ls: cannot access '/usr/local/share/perl5/site_perl/5.30': No such file or directory

If I simply create these empty directories the problem goes away.

Could the perl package just include these empty directories?

Re: missing perl directories

[Marco Atzeri]

On 21.01.2021 17:09, Anthony Heading wrote:
> Hi,
> 
> Whenever I have a new cygwin setup,  I get an error/warning when trying to install perl modules:
> 

> 
> ls: cannot access '/usr/local/lib/perl5/site_perl/5.30/x86_64-cygwin-threads': No such file or directory
> ls: cannot access '/usr/local/share/perl5/site_perl/5.30': No such file or directory
> 
> If I simply create these empty directories the problem goes away.
> 
> Could the perl package just include these empty directories?

/usr/local/* are "local"

no package should touch them

Marco

Re: missing perl directories

[Brian Inglis]

On 2021-01-21 09:09, Anthony Heading wrote:
> Whenever I have a new cygwin setup,  I get an error/warning when trying to install perl modules:
> 
> % cpan install Win32::Symlink
> Loading internal logger. Log::Log4perl recommended for better logging
> [...]
> Use of uninitialized value $what in concatenation (.) or string at /usr/share/perl5/5.30/App/Cpan.pm line 679, <STDIN> line 1.
> Warning: You do not have write permission for Perl library directories.
> 
> I think it is just because the site_perl directories do not exist.
> 
> % perl -V
> Summary of my perl5 (revision 5 version 30 subversion 3) configuration:
> [...]
>    @INC:
>      /usr/local/lib/perl5/site_perl/5.30/x86_64-cygwin-threads
>      /usr/local/share/perl5/site_perl/5.30
>      /usr/lib/perl5/vendor_perl/5.30/x86_64-cygwin-threads
>      /usr/share/perl5/vendor_perl/5.30
>      /usr/lib/perl5/5.30/x86_64-cygwin-threads
>      /usr/share/perl5/5.30
> 
> ls: cannot access '/usr/local/lib/perl5/site_perl/5.30/x86_64-cygwin-threads': No such file or directory
> ls: cannot access '/usr/local/share/perl5/site_perl/5.30': No such file or directory
> 
> If I simply create these empty directories the problem goes away.
> 
> Could the perl package just include these empty directories?

I don't knowingly use perl packages but I have those directories:

$ perl -V | tail -6 | xargs ls -d
/usr/lib/perl5/5.30/x86_64-cygwin-threads 
/usr/local/share/perl5/site_perl/5.30
/usr/lib/perl5/vendor_perl/5.30/x86_64-cygwin-threads      /usr/share/perl5/5.30
/usr/local/lib/perl5/site_perl/5.30/x86_64-cygwin-threads 
/usr/share/perl5/vendor_perl/5.30

either something has not completed correctly, or something is missing in recent 
installations.

-- 
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

This email may be disturbing to some readers as it contains
too much technical detail. Reader discretion is advised.
[Data in binary units and prefixes, physical quantities in SI.]

Re: missing perl directories

[Anthony Heading]

Hi Brian!

On Fri, Jan 22, 2021, at 7:33 AM, Brian Inglis wrote:
> either something has not completed correctly, or something is missing in recent 
> installations.

I think that's right.  Those the directories which are referenced in the binary,  I know the generic upstream perl source process has always created them,  but they're not included in the current cygwin package.   As a total guess, empty directories are maybe now being elided in the cygwin packaging process?

% strings - /bin/cygperl5_30.dll  | grep /usr/local
/usr/local/lib/perl5/site_perl/5.30/x86_64-cygwin-threads
/usr/local/share/perl5/site_perl/5.30

% cygcheck -p site_perl
Found 4 matches for site_perl
grepmail-5.3033-2 - grepmail: search mailboxes for mail matching an expression (installed binaries and support files)
perl-Stow-2.3.1-1 - perl-Stow: perl library for stow
perl-Stow-2.3.1-2 - perl-Stow: Perl library for stow
perl-Stow-2.3.1-3 - perl-Stow: Perl library for stow


On Thu, Jan 21, 2021, at 4:22 PM, Marco Atzeri via Cygwin wrote:
> /usr/local/* are "local"
> 
> no package should touch them

Marco,  I have no idea how to interpret that statement constructively. 

Re: missing perl directories

[Marco Atzeri]

On 22.01.2021 17:15, Anthony Heading wrote:
> Hi Brian!
> 
> On Fri, Jan 22, 2021, at 7:33 AM, Brian Inglis wrote:
>> either something has not completed correctly, or something is missing in recent
>> installations.
> 
> I think that's right.  Those the directories which are referenced in the binary,  I know the generic upstream perl source process has always created them,  but they're not included in the current cygwin package.   As a total guess, empty directories are maybe now being elided in the cygwin packaging process?
> 
> % strings - /bin/cygperl5_30.dll  | grep /usr/local
> /usr/local/lib/perl5/site_perl/5.30/x86_64-cygwin-threads
> /usr/local/share/perl5/site_perl/5.30
> 
> % cygcheck -p site_perl
> Found 4 matches for site_perl
> grepmail-5.3033-2 - grepmail: search mailboxes for mail matching an expression (installed binaries and support files)
> perl-Stow-2.3.1-1 - perl-Stow: perl library for stow
> perl-Stow-2.3.1-2 - perl-Stow: Perl library for stow
> perl-Stow-2.3.1-3 - perl-Stow: Perl library for stow

not on usr/local

perl-Stow: Perl library for stow

     2020-02-04 19:14           0 usr/share/perl5/
     2020-02-04 19:14           0 usr/share/perl5/site_perl/
     2020-02-04 19:14           0 usr/share/perl5/site_perl/5.30/
     2020-02-04 19:14           0 usr/share/perl5/site_perl/5.30/Stow/
     2020-02-04 19:14        5559 
usr/share/perl5/site_perl/5.30/Stow/Util.pm
     2020-02-04 19:14       70081 usr/share/perl5/site_perl/5.30/Stow.pm


>> no package should touch them
> 
> Marco,  I have no idea how to interpret that statement constructively.

Sorry, I should have be more clear.

We can discuss if the perl package should deliver empty directories like

     usr/share/perl5/site_perl/

and similar. It seems reasonable but I am not a Perl expert, however
a distribution package should never write on "/usr/local"

https://tldp.org/LDP/Linux-Filesystem-Hierarchy/html/usr.html

" The /usr/local hierarchy is for use by the system administrator when 
installing software locally. It needs to be safe from being overwritten 
when the system software is updated"

Regards
Marco

Re: missing perl directories

[Anthony Heading]

On Fri, Jan 22, 2021, at 4:36 PM, Marco Atzeri via Cygwin wrote:
> 
> not on usr/local
> 
> perl-Stow: Perl library for stow
> 
>      2020-02-04 19:14           0 usr/share/perl5/
>      2020-02-04 19:14           0 usr/share/perl5/site_perl/
>      2020-02-04 19:14           0 usr/share/perl5/site_perl/5.30/
>      2020-02-04 19:14           0 usr/share/perl5/site_perl/5.30/Stow/
>      2020-02-04 19:14        5559 
> usr/share/perl5/site_perl/5.30/Stow/Util.pm
>      2020-02-04 19:14       70081 usr/share/perl5/site_perl/5.30/Stow.pm
> 

Correct.   And of course that means this Stow package doesn't actually work:

% perl -MStow -e ''
Can't locate Stow.pm in @INC (you may need to install the Stow module) (@INC contains: /usr/local/lib/perl5/site_perl/5.30/x86_64-cygwin-threads /usr/local/share/perl5/site_perl/5.30 /usr/lib/perl5/vendor_perl/5.30/x86_64-cygwin-threads /usr/share/perl5/vendor_perl/5.30 /usr/lib/perl5/5.30/x86_64-cygwin-threads /usr/share/perl5/5.30).

Similar to your reference to the FHS,  the corresponding Perl policy intends that "site_perl" is to be used by the local SA.  There is a "vendor_perl" concept instead to support this kind of cygwin packaging, as you can see referenced in the default path above.

But the Stow example is a distraction which compounds two problems, so let's leave that aside.

At core, this is catch 22.
  -  The perl build reserves, creates, and expects to exist,  an empty directory for the sole use of the SA:   "site_perl".   
  -  Cygwin perl assigns that directory location into the tree similarly intended for the SA:   "/usr/local"
  -  Your strict interpretation of the FHS disallows the empty site_perl directory to be created for use by the SA because it's positioned within a tree reserved for use by the SA

I dunno,  Marco,  I'm not so dogmatic, and I can fix my own installation.  I just thought this would be a helpful bug report for others.   It sounds like we can find enough conflicting Cygwin policy documents to ensure that there is no solution,  so that's delightful.

Re: missing perl directories

[Ken Brown]

On 1/22/2021 12:53 PM, Anthony Heading wrote:
> On Fri, Jan 22, 2021, at 4:36 PM, Marco Atzeri via Cygwin wrote:
>>
>> not on usr/local
>>
>> perl-Stow: Perl library for stow
>>
>>       2020-02-04 19:14           0 usr/share/perl5/
>>       2020-02-04 19:14           0 usr/share/perl5/site_perl/
>>       2020-02-04 19:14           0 usr/share/perl5/site_perl/5.30/
>>       2020-02-04 19:14           0 usr/share/perl5/site_perl/5.30/Stow/
>>       2020-02-04 19:14        5559
>> usr/share/perl5/site_perl/5.30/Stow/Util.pm
>>       2020-02-04 19:14       70081 usr/share/perl5/site_perl/5.30/Stow.pm
>>
> 
> Correct.   And of course that means this Stow package doesn't actually work:

Achim has already answered your original question, but I just want to chime in 
to correct your misstatement.

> % perl -MStow -e ''
> Can't locate Stow.pm in @INC (you may need to install the Stow module) (@INC contains: /usr/local/lib/perl5/site_perl/5.30/x86_64-cygwin-threads /usr/local/share/perl5/site_perl/5.30 /usr/lib/perl5/vendor_perl/5.30/x86_64-cygwin-threads /usr/share/perl5/vendor_perl/5.30 /usr/lib/perl5/5.30/x86_64-cygwin-threads /usr/share/perl5/5.30)
perl-Stow works fine.  It's intended to be used by /usr/bin/stow, which knows 
where to find it.

Ken

Re: missing perl directories

[Achim Gratz]

Anthony Heading writes:
> On Fri, Jan 22, 2021, at 4:36 PM, Marco Atzeri via Cygwin wrote:
>>      2020-02-04 19:14       70081 usr/share/perl5/site_perl/5.30/Stow.pm

That's a known packaging error caused by the stow configury / Makefile
using its own special idea of installsitelib instead of installvendorlib
(or at least installsitelib) from the existing Perl.

--8<---------------cut here---------------start------------->8---
# Perl modules will be installed to ${prefix}/share/perl5/site_perl/5.30
# which will expand to
#
#   /usr/share/perl5/site_perl/5.30
#
# unless you override the value of prefix at make-time.

config.status: creating Makefile
make[1]: Entering directory '/cygdrive/c/Users/ASSI/CygwinHome/stow/stow.noarch/build'
make[1]: Leaving directory '/cygdrive/c/Users/ASSI/CygwinHome/stow/stow.noarch/build'
[ -d bin ] || mkdir bin # required in vpath mode

# Perl modules will be installed to /usr/share/perl5/site_perl/5.30
# 
# This is not in /usr/bin/perl's built-in @INC, so the
# front-end scripts will have an appropriate "use lib"
# line inserted to compensate.
--8<---------------cut here---------------end--------------->8---

Andrew, should you read this, putting

--8<---------------cut here---------------start------------->8---
CYGCONF_ARGS="--with-pmdir=$(perl -MConfig -e 'print $Config{installvendorlib}')"
--8<---------------cut here---------------end--------------->8---

into stow.cygport should resolve that problem.

> Correct.   And of course that means this Stow package doesn't actually work:
>
> % perl -MStow -e ''
> Can't locate Stow.pm in @INC (you may need to install the Stow module) (@INC contains: /usr/local/lib/perl5/site_perl/5.30/x86_64-cygwin-threads /usr/local/share/perl5/site_perl/5.30 /usr/lib/perl5/vendor_perl/5.30/x86_64-cygwin-threads /usr/share/perl5/vendor_perl/5.30 /usr/lib/perl5/5.30/x86_64-cygwin-threads /usr/share/perl5/5.30).

It's a captive backend for the GNU stow application and stow sets up
@INC so that it does work correctly in that context.  There are no other
users of that module that I know of.

> At core, this is catch 22.
>
>   - The perl build reserves, creates, and expects to exist, an empty
>   directory for the sole use of the SA: "site_perl".

Again, it doesn't.  If you (the SA) put files there they will be used by
default, but it's not an error for that path or any leading components
to not exist.

>   -  Cygwin perl assigns that directory location into the tree
>   similarly intended for the SA:   "/usr/local"

Yes and it does that since several years (I think with the switch to
5.26).  I'd have to dig out who requested it and why, but it was changed
deliberately to separate the Cygwin and local installation, likely
following Fedora and some other Linux distributions.

>   - Your strict interpretation of the FHS disallows the empty
>   site_perl directory to be created for use by the SA because it's
>   positioned within a tree reserved for use by the SA

Yes, but since you don't need to create them there is no problem that
needs solving.

> I dunno, Marco, I'm not so dogmatic, and I can fix my own
> installation.  I just thought this would be a helpful bug report for
> others.  It sounds like we can find enough conflicting Cygwin policy
> documents to ensure that there is no solution, so that's delightful.

So what's your point here, then?


Regards,
Achim.
-- 
+<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk Blofeld]>+

SD adaptations for Waldorf Q V3.00R3 and Q+ V3.54R2:
http://Synth.Stromeko.net/Downloads.html#WaldorfSDada

Re: missing perl directories

[Achim Gratz]

Anthony Heading writes:
> Whenever I have a new cygwin setup,  I get an error/warning when trying to install perl modules:
>
> % cpan install Win32::Symlink
> Loading internal logger. Log::Log4perl recommended for better logging
> [...]
> Use of uninitialized value $what in concatenation (.) or string at /usr/share/perl5/5.30/App/Cpan.pm line 679, <STDIN> line 1.
> Warning: You do not have write permission for Perl library directories.
>
> I think it is just because the site_perl directories do not exist.

No, I don't get these warnings, so it's something on your system that
triggers these.

$ rm -fr /usr/local/{lib,share}
$  cpan install Win32::Symlink
CPAN: CPAN::SQLite loaded ok (v0.219)
Database was generated on Fri, 22 Jan 2021 19:19:22 GMT
Running install for module 'Win32::Symlink'
CPAN: Digest::SHA loaded ok (v6.02)
CPAN: Compress::Zlib loaded ok (v2.096)
Checksum for /cygdrive/c/Users/ASSI/CygwinHome/.local/share/.cpan/sources/authors/id/A/AU/AUDREYT/Win32-Symlink-0.06.tar.gz ok
CPAN: YAML::XS loaded ok (v0.82)
CPAN: CPAN::Meta::Requirements loaded ok (v2.140)
CPAN: Parse::CPAN::Meta loaded ok (v2.150010)
CPAN: CPAN::Meta loaded ok (v2.150010)
Configuring A/AU/AUDREYT/Win32-Symlink-0.06.tar.gz with Makefile.PL
Cannot determine license info from Symlink.pm
Checking if your kit is complete...
Looks good
Generating a Unix-style Makefile
Writing Makefile for Win32::Symlink
Writing MYMETA.yml and MYMETA.json
  AUDREYT/Win32-Symlink-0.06.tar.gz
  /usr/bin/perl Makefile.PL -- OK
Running make for A/AU/AUDREYT/Win32-Symlink-0.06.tar.gz
CPAN: Module::CoreList loaded ok (v5.20200601_30)
cp Symlink.pm blib/lib/Win32/Symlink.pm
Running Mkbootstrap for Symlink ()
chmod 644 "Symlink.bs"
"/usr/bin/perl.exe" "-Iinc" -MExtUtils::Command::MM -e 'cp_nonempty' -- Symlink.bs blib/arch/auto/Win32/Symlink/Symlink.bs 644
"/usr/bin/perl.exe" "-Iinc" "/usr/share/perl5/vendor_perl/5.30/ExtUtils/xsubpp"  -typemap '/usr/share/perl5/5.30/ExtUtils/typemap' -typemap '/cygdrive/c/Users/ASSI/CygwinHome/.local/share/.cpan/build/Win32-Symlink-0.06-1/typemap'  Symlink.xs > Symlink.xsc
Please specify prototyping behavior for Symlink.xs (see perlxs manual)
mv Symlink.xsc Symlink.c
gcc -c   -DPERL_USE_SAFE_PUTENV -U__STRICT_ANSI__ -D_GNU_SOURCE -ggdb -O2 -pipe -Wall -Werror=format-security -D_FORTIFY_SOURCE=2 -fstack-protector-strong --param=ssp-buffer-size=4 -fdebug-prefix-map=/mnt/share/cygpkgs/perl/perl.x86_64/build=/usr/src/debug/perl-5.30.3-1 -fdebug-prefix-map=/mnt/share/cygpkgs/perl/perl.x86_64/src/perl-5.30.3=/usr/src/debug/perl-5.30.3-1 -fwrapv -fno-strict-aliasing -DUSEIMPORTLIB -O3   -DVERSION=\"0.06\" -DXS_VERSION=\"0.06\"  "-I/usr/lib/perl5/5.30/x86_64-cygwin-threads/CORE"   Symlink.c
rm -f blib/arch/auto/Win32/Symlink/Symlink.dll
g++  --shared  -Wl,--enable-auto-import -Wl,--export-all-symbols -Wl,--enable-auto-image-base -fstack-protector-strong  Symlink.o  -o blib/arch/auto/Win32/Symlink/Symlink.dll  \
  /usr/lib/perl5/5.30/x86_64-cygwin-threads/CORE/cygperl5_30.dll -lpthread -lnsl -ldl -lcrypt   \
  
chmod 755 blib/arch/auto/Win32/Symlink/Symlink.dll
Manifying 1 pod document
  AUDREYT/Win32-Symlink-0.06.tar.gz
  /usr/bin/make -- OK
Running make test for AUDREYT/Win32-Symlink-0.06.tar.gz
"/usr/bin/perl.exe" "-Iinc" -MExtUtils::Command::MM -e 'cp_nonempty' -- Symlink.bs blib/arch/auto/Win32/Symlink/Symlink.bs 644
PERL_DL_NONLAZY=1 "/usr/bin/perl.exe" "-MExtUtils::Command::MM" "-MTest::Harness" "-e" "undef *Test::Harness::Switches; test_harness(0, 'inc', 'blib/lib', 'blib/arch')" t/*.t
t/1-basic.t .. ok   
All tests successful.
Files=1, Tests=4,  1 wallclock secs ( 0.05 usr  0.03 sys +  0.09 cusr  0.06 csys =  0.23 CPU)
Result: PASS
  AUDREYT/Win32-Symlink-0.06.tar.gz
  /usr/bin/make test -- OK
Running make install for AUDREYT/Win32-Symlink-0.06.tar.gz
"/usr/bin/perl.exe" "-Iinc" -MExtUtils::Command::MM -e 'cp_nonempty' -- Symlink.bs blib/arch/auto/Win32/Symlink/Symlink.bs 644
Manifying 1 pod document
Files found in blib/arch: installing files in blib/lib into architecture dependent library tree
Installing /usr/local/lib/perl5/site_perl/5.30/x86_64-cygwin-threads/auto/Win32/Symlink/Symlink.dll
Installing /usr/local/lib/perl5/site_perl/5.30/x86_64-cygwin-threads/Win32/Symlink.pm
Installing /usr/local/share/man/man3/Win32.Symlink.3pm
Appending installation info to /usr/lib/perl5/5.30/x86_64-cygwin-threads/perllocal.pod
  AUDREYT/Win32-Symlink-0.06.tar.gz
  /usr/bin/make install  -- OK
$

For good measure I repeated this with /usr/local not existing at all and
the result stays the same.

> % perl -V
> Summary of my perl5 (revision 5 version 30 subversion 3) configuration:
> [...]
>   @INC:
>     /usr/local/lib/perl5/site_perl/5.30/x86_64-cygwin-threads
>     /usr/local/share/perl5/site_perl/5.30
>     /usr/lib/perl5/vendor_perl/5.30/x86_64-cygwin-threads
>     /usr/share/perl5/vendor_perl/5.30
>     /usr/lib/perl5/5.30/x86_64-cygwin-threads
>     /usr/share/perl5/5.30
>
> ls: cannot access '/usr/local/lib/perl5/site_perl/5.30/x86_64-cygwin-threads': No such file or directory
> ls: cannot access '/usr/local/share/perl5/site_perl/5.30': No such file or directory
>
> If I simply create these empty directories the problem goes away.

If its just a warning then there really isn't a problem that needs
fixing, but anyway there is no presumtption that the site directories
must exist anyway.  All installation methods are supposed to create
leading path components.

> Could the perl package just include these empty directories?

See above and /usr/local is off-limits for packaging.


Regards,
Achim.
-- 
+<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk Blofeld]>+

SD adaptations for KORG EX-800 and Poly-800MkII V0.9:
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Re: missing perl directories

[Anthony Heading]

On Fri, Jan 22, 2021, at 7:35 PM, Achim Gratz wrote:
> 
> For good measure I repeated this with /usr/local not existing at all and
> the result stays the same.

Achim,  that was a helpful test, thankyou.   Digging further, the triggering perl code in /usr/share/perl5/5.30/CPAN/FirstTime.pm,  so to replicate I also need to delete my ~/.cpan directory.   Could you try doing that too and see if you agree?

Here's the fuller problem, which is more than a cosmetic warning:

================

% cpan install Win32::Symlink
Loading internal logger. Log::Log4perl recommended for better logging

CPAN.pm requires configuration, but most of it can be done automatically.
If you answer 'no' below, you will enter an interactive dialog for each
configuration option instead.

Would you like to configure as much as possible automatically? [yes]
Use of uninitialized value $what in concatenation (.) or string at /usr/share/perl5/5.30/App/Cpan.pm line 679, <STDIN> line 1.

Warning: You do not have write permission for Perl library directories.

To install modules, you need to configure a local Perl library directory or
escalate your privileges.  CPAN can help you by bootstrapping the local::lib
module or by configuring itself to use 'sudo' (if available).  You may also
resolve this problem manually if you need to customize your setup.

What approach do you want?  (Choose 'local::lib', 'sudo' or 'manual')
 [local::lib]
[...]

================

So the _apparent_ lack of write permission triggers a whole load of privilege escalation machinery which is unnecessary.

This code is in 

    unless ( $matcher
        || _can_write_to_libdirs() || _using_installbase() || _using_sudo()
    ) {
        local $auto_config = 0; # We *must* ask, even under autoconfig
        local *_real_prompt;    # We *must* show prompt
        my_prompt_loop(install_help => 'local::lib', $matcher,
                   'local::lib|sudo|manual');
    }

and the core test on that looks like this:

sub _can_write_to_libdirs {
    return -w $Config{installprivlib}
        && -w $Config{installarchlib}
        && -w $Config{installsitelib}
        && -w $Config{installsitearch}
}

hence there is an assumption that these directories exist.

Re: missing perl directories

[Achim Gratz]

Anthony Heading writes:
[…]
> What approach do you want?  (Choose 'local::lib', 'sudo' or 'manual')
>  [local::lib]

Well, just say "manual" at this prompt to override the heuristics for
switching to local::lib, then.  Alternatively you can report it upstream
so that this check is properly guarded (if the leading path is writable
by the current user then local::lib is not necessary).

In general, if you install Cygwin often enough for this to be a nuisance
I'd recommend adding a package to your local repo that sets up such
things in a postinstall script.


Regards,
Achim.
-- 
+<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk Blofeld]>+

Samples for the Waldorf Blofeld:
http://Synth.Stromeko.net/Downloads.html#BlofeldSamplesExtra

Re: missing perl directories

[Anthony Heading]

On Sat, Jan 23, 2021, at 7:08 PM, Achim Gratz wrote:
> Anthony Heading writes:
> […]
> > What approach do you want?  (Choose 'local::lib', 'sudo' or 'manual')
> >  [local::lib]
> 
> Well, just say "manual" at this prompt to override the heuristics for
> switching to local::lib, then.  Alternatively you can report it upstream
> so that this check is properly guarded (if the leading path is writable
> by the current user then local::lib is not necessary).

I couldn't say whether there are additional parts of the CPAN ecosystem that
are surprised by the site_perl directories having been deleted.  And
indeed maybe 'manual' works as a bypass,  though it's not obvious.

> In general, if you install Cygwin often enough for this to be a nuisance
> I'd recommend adding a package to your local repo that sets up such
> things in a postinstall script.
> 

Sure.  I like Cygwin and I install it a lot (so thank-you btw to everyone!),
but there is an easy workaround once you know.   As I said before,  it's just
a bug report because the final result of packaging is slightly broken and would
certainly confuse new users.  But then again,  I'm of a certain age; the new
generation uses python and chromebooks so maybe there are no new users :-)

I think the issue is sufficiently understood, have appreciated the discussion.

Rgds

A