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setup complains about cygwin-doc package update

Curious about an error that setup.exe reported today related to upgrading 
package cygwin-doc to 2.8.1-1, saying:

Postinstall script errors
	These do not necessarily mean that affected packages will fail to function
	properly, but please check /var/log/setup.log.full and report any problems.

Package: _/cygwin-doc
	cygwin-doc.sh exit code 2

A subsequent setup.exe run with nothing pending gave a different message:

Package: _/Unknown package
	cygwin-doc.sh exit code 2

Looking in setup.log.full I see:

2017/07/05 09:13:33 running: C:\cygwin64\bin\bash.exe --norc --noprofile "/etc/postinstall/cygwin-doc.sh"
Can't find directory '/proc/cygdrive/c/ProgramData/Microsoft/Windows/Start Menu/Programs/Cygwin'
2017/07/05 09:13:34 abnormal exit: exit code=2

Indeed, there is no Cygwin directory in existing directory 
'/proc/cygdrive/c/ProgramData/Microsoft/Windows/Start Menu/Programs'.

Looking at cygwin-doc.sh, it seems that the script is trying to put some things in that directory.

So, I manually created the directory and reran setup. This time no errors reported, 
and the newly created directory contains the following files:

$ ls -l
total 24
-rwxr-xr-x+ 1 knellis Domain Users 1233 Jul  5 09:30 'API (HTML).lnk'
-rwxr-xr-x+ 1 knellis Domain Users 1041 Jul  5 09:30 'API (PDF).lnk'
-rwxr-xr-x+ 1 knellis Domain Users 1248 Jul  5 09:30  FAQ.lnk
-rwxr-xr-x+ 1 knellis Domain Users 1224 Jul  5 09:30 'Home Page.lnk'
-rwxr-xr-x+ 1 knellis Domain Users 1242 Jul  5 09:30 'User Guide (HTML).lnk'
-rwxr-xr-x+ 1 knellis Domain Users 1050 Jul  5 09:30 'User Guide (PDF).lnk'

So, these are handy links to have, I guess, but is it appropriate for
cygwin-doc.sh to presume that the directory exists? Maybe it should create it
rather than simply bail out and complain if it doesn't exist.

--Ken Nellis

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