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Date: Mon, 06 Apr 2009 09:03:32 -0400
From: Charles Wilson <cygwin AT cwilson DOT fastmail DOT fm>
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Subject: Re: Reverting from 1.7.0-45 [was Re: [1.7]: For the love of god,  don't  update!]
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Dave Korn wrote:
>   LOLWUT?  It turns out something has gone horribly wrong in the alternatives
> department now:
> 
> $ gcc
> bash: gcc: command not found
> 
> $ gcc.exe
> bash: gcc.exe: command not found
> 
> $ file /bin/gcc.exe
> /bin/gcc.exe: broken symbolic link to `/etc/alternatives/gcc'
> 
> $ ls /etc/alternatives/gcc -la
> lrwxrwxrwx 1 DKAdmin None 3 Apr  6 04:29 /etc/alternatives/gcc -> ??/
> 
> $ /usr/sbin/alternatives.exe --help
> 
> $ echo $?
> 128
> 
> $
> 
>   And, right; alternatives.exe needs the ctype_ptr import.  And I'll bet that
> p7zip doesn't use any ctype functions.  It looks like if you want to revert
> back across the change, you need to revert any/all of these as well:
> 
> cygwin
> m4
> alternatives

Actually, from Corinna's reply, it appears that, in addition to
reverting *alternatives* because of the dependence that the new -10
package has on the the cygwin-1.7.0-45 ctype export, you may also need
to revert any package that USES alternatives (or, at least, run
/usr/sbin/alternatives to recreate the symlinks using the "old" method)

alternatives, when it is installed or reinstalled, does not create any
symlinks. It's only when it is /used/ that that happens.

Now, if you upgrade (say) gcc4 while you have cygwin-1.7.0-45 installed,
then that process has two parts:

1) uninstall the old version
   This will run '/usr/sbin/alternatives --remove' on the version of gcc
that your are upgrading.  Assuming your gcc system was already set to
have gcc4 as the default (as I suspect DK's system is), then this has
the effect of recreating all of the symlinks in /etc/alternatives to
point to the gcc3 versions. Since you have cygwin-1.7.0-45, these (now)
become UTF16 symlinks.

2) install the new version
   This will run '/usr/sbin/alternatives --add' on the new gcc4.
However, because the current "priority" of gcc4 under alternatives is
below gcc3, nothing will change, until you...

3) manually run '/usr/sbin/alternatives' to reset (in DK's likely case)
gcc to be gcc4.  Again, this will re-create the symlinks in
/etc/alternatives to point at gcc4 (and, again, because you have
cygwin-1.7.0-45 installed, these will be UTF16 symlinks.

My suggestion with regards to this, and rolling back across the -45/-44
ABI break, is to manually execute all of:

/etc/preremove/gcc.sh.done
/etc/preremove/gcc-g77.sh.done
/etc/preremove/gcc-g++.sh.done
( and others, depending on what components of gcc3 you have installed )

/etc/preremove/gcc4.sh.done
/etc/preremove/gcc4-g77.sh.done
/etc/preremove/gcc4-g++.sh.done
( and others, depending on what components of gcc4 you have installed )

Then, roll back both alternatives and cygwin (and vim, and...).

Next, manaully execute all of:

/etc/postinstall/gcc.sh.done
/etc/postinstall/gcc-g77.sh.done
/etc/postinstall/gcc-g++.sh.done
( and others, depending on what components of gcc3 you have installed )

/etc/postinstall/gcc4.sh.done
/etc/postinstall/gcc4-g77.sh.done
/etc/postinstall/gcc4-g++.sh.done
( and others, depending on what components of gcc4 you have installed )

And finally, (if you're DK),

/usr/sbin/alternatives --set "gcc" "/usr/bin/gcc-4.exe"
/usr/sbin/alternatives --set "g++" "/usr/bin/g++-4.exe"
/usr/sbin/alternatives --set "g77" "/usr/bin/g77-4.exe"
( and others, depending on what components of gcc4 you wish to have be
the default )

> diffstat
> vim
> xxd
> 

So, IIUC, alternatives-1.3.30c-10 isn't *itself* actually broken, right?

--
Chuck

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