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Subject:	Re: Error Installing Cygwin (setup-x86_64.exe & setup-x86) - No setup.ini.sig found.
To:	cygwin AT cygwin DOT com
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From:	Ken Brown <kbrown AT cornell DOT edu>
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Date:	Sun, 18 Oct 2015 11:38:03 -0400
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On 10/18/2015 9:47 AM, Ken Brown wrote:
> On 10/18/2015 9:28 AM, Achim Gratz wrote:
>> Ken Brown writes:
>>> Are you saying you've never tested local installs without the -m
>>> switch?
>>
>> No, I'm saying that the "-m" switch should reduce the possibility of
>> setup doing something unwanted, because it eliminates the possibility of
>> it switching into ad-hoc mode (where it searches the subdirs for
>> setup.ini and package files to full depth).
>>
>>> If so, that explains why you haven't been able to reproduce
>>> the problems that several of us have reported.  I just verified that
>>> setup does indeed correctly descend into subdirectories with the -m
>>> switch.
>>
>> That still doesn't tell me what about your mirror directories triggers
>> it to not use local mirror mode when not using that switch.  If the
>> directory structure is correct that is in theory impossible since it
>> tries mirror mode first and only if it doesn't find a useable setup file
>> that way would it fall back to ad-hoc mode.  Please run the commands in
>> my other replay to David Stacey and tell me the result.
>
> $ find -mindepth 1 -maxdepth 1 -name $arch | \
>  > xargs -I: sh -c 'for f in :/setup.{xz,bz2,ini}; \
>  > do [ -e $f ] && { echo $f ; break; } done' && \
>  > find -mindepth 2 -maxdepth 2 -name $arch | \
>  > xargs -I: sh -c 'for f in :/setup.{xz,bz2,ini}; \
>  > do [ -e $f ] && { echo $f ; break; } done'
> ./http%3a%2f%2fmirrors.kernel.org%2fsourceware%2fcygwin%2f/x86/setup.ini
> ./http%3a%2f%2fsanibeltranquility.com%2fcygwin%2f/x86/setup.ini
> ./myrepo/x86/setup.xz

Just for the record, I did a git bisection, showing (unsurprisingly) that the 
first bad commit is one of the following two:

commit 18837afa64984e98476401e99dcd772970cf9736
Author: Achim Gratz <Stromeko AT Stromeko DOT DE>
Date:   Sat Jul 11 21:58:30 2015 +0200

     Refactor setup search and implement XZ compressed setup files

         * ini.cc: Construct setup_ext_list from array until we can use
         C++11 aggregate initializers.  Clean up function parenthesis.
         (decompress_ini): Refactored for use from do_local_ini and
         do_remote_ini.  Change outdated comment about setup.ini
         uncompressed size.
         (check_ini_sig): Factor out signature check.
         (fetch_remote_ini): Refactored for use from do_remote_ini.
         (do_local_ini): Iterate over search results in found_ini_list.
         Use decompress_ini and check_ini_sig.
         (do_remote_ini): Iterate over known setup file extensions from
         setup_ext_list with early-out semantics, preferring ".xz" over
         ".bz2" over ".ini" extension.  Use fetch_remote_ini and
         check_ini_sig.
         * ini.h: Remove unused macros.
         * IniParseFindVisitor.cc: Remove, the search is already done by
         SetupFindVisitor in do_from_local_dir.
         * IniParseFindVisitor.cc: Ditto.
         * Makefile.am (@SETUP AT _SOURCES): Ditto.

commit 35addac4a65a1d70ab02b8d175f71efa83cf74ba
Author: Achim Gratz <Stromeko AT Stromeko DOT DE>
Date:   Wed Jul 1 21:36:12 2015 +0200

     Correct local directory search

         * fromcwd.cc: Remove unused includes.  Add global found_ini_list
         to record the search result.
         (SetupFindVisitor): Make setup.{ini,bz2,xz} known and provide bool
         private variables to record whether we found them.  Another bool
         inidir to indicate whether we are currently inside a directory
         where setup.ini files should exist.
         (SetupFindVisitor::visitFile): When inidir is true, check if a
         setup file with one of the known extensions was found and set the
         corresponding bool variables.
             (SetupFindVisitor::visitDirectory): Set inidir when appropriate.
         Recurse into directories only if they are potential mirror dirs,
         based on level. Truncate search and recurse into inidir.  Record
         any setup files in found_ini_list while preferring ".xz" over
         ".bz2" over ".ini" extension.
         (SetupFindVisitor::operator bool): Return true when found_ini_list
         is non-empty.
         (do_from_local_dir): Restrict search to either a single mirror
         hierarchy or multiple mirror hierarchy; setup files directly in
         local directory or mixed hierarchies are no longer recognized.
         The setup files must be present in an architecture dependent
         directory of "x86/" or "x86_64/", either in the local directory
         for single mirror or one level down for multiple mirrors.

     This patch already finds setup.xz files, but the code to deal with
     them will be in a later patch.  The current code re-does the search
     and ignores the results from here.

setup didn't build after 35addac, so I can't pin it down further. 
Unfortunately, those two commits seem to involve fairly substantial changes.

As test case for the bisection, I used step 4 of the recipe I posted in 
https://www.cygwin.com/ml/cygwin/2015-10/msg00267.html.

Ken

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