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Date:	Tue, 06 Mar 2018 17:27:33 +0100
From:	Houder <houder AT xs4all DOT nl>
To:	cygwin AT cygwin DOT com
Subject:	Re: Setup-x86(_64) (v2.889) ... just a question
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On 2018-03-06 16:38, Jon Turney wrote:
> On 06/03/2018 13:39, Houder wrote:
> [...]> However to my surprise /etc/setup/installed.db now lists:
>> 
>> 64-@@ grep -e cscope -e lz4 
>> /drv/e/Cygwin64-test/etc/setup/installed.db
>> cscope cscope-15.8a-2.tar.bz2 1 <==== artifical version number
>> liblz4_1 liblz4_1-1.7.5-0.tar.bz2 0 <==== ditto
>> 
>> These files do NOT exist. The file names were "artificially crafted".
>> 
>> The files that do exist, are:
>> 
>> 64-@@ ls -l release/cscope release/lz4/liblz4_1
>> release/cscope:
>> total 700
>> -rw-r--r-- 1 Henri None 381409 Mar  6 13:18 cscope-15.8.0.1-2.tar.bz2
>> -rw-r--r-- 1 Henri None 330264 Mar  6 13:16 cscope-15.8b-1.tar.xz
>> 
>> release/lz4/liblz4_1:
>> total 52
>> -rw-r--r-- 1 Henri None 30408 Mar  6 12:37 liblz4_1-1.7.5-1.tar.xz
>> -rw-r--r-- 1 Henri None 17924 Mar  6 11:15 liblz4_1-131-1.tar.xz
>> 
>> Is this the future of setup? Meaning, is it the intention that it may
>> be possible that installed.db refers to files that do not exist?
> 
> Not only the future, but the present and past, as well.
> 
> Despite appearances, these aren't filenames, but versions encoded in
> peculiar way, for backwards compatibility.  See [1].
> 
> [1] https://cygwin.com/ml/cygwin/2018-02/msg00037.html

package_db.cc (package::flush() ):

   /*
      In INSTALLED.DB 3, lines are: 'packagename version flags', where
      version is encoded in a notional filename for backwards
      compatibility, and the only currently defined flag is user-picked
      (bit 0).
    */

Got it. Thank you. Made a note of this for myself.

Henri


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