> On 19 Mar 2015, at 20:18, squeak-dev-request at lists.squeakfoundation.org wrote:
> 
> Max,
> 
> Before I go about trying to install Squeak on my machine, could you 
> provide me with more details about the environment that you are running in?

I’m sorry you had to write all this stuff. I’m usually more thorrough with my reports.

> 
> I'm not seeing any issues with my travis builds nor has anyone else run 
> into this issue... So I'm suspicious that the root cause is going to be 
> something unique to your working environment. I haven't run Squeak 
> myself in months:) and I rely on Travis .... So I have to find and 
> download all the bits and pieces to install Squeak in my environment in 
> the hopes that when I execute your expression I will see the same 
> corruption as you are seeing (I don't have a great batting average in 
> this regards) ...
> 
> It certainly appears that ConfigurationOfMetacello-dkh.800.mcz is not 
> corrupted up on smalltalkhub or gemsource (the two repos accessed during 
> bootstrapping)... which also leads me to believe that the root cause is 
> in your setup ...
> 
> Your package has been truncated it should be 128999 bytes and your copy 
> is 53989 ... perhaps your copy of the package is corrupted in the 
> package-cache?
> 
> The next most likely culprit is the vm ... which brings me back to why I 
> asked the question at the top of the email ... if you give me the 
> details about your setup - vm version is probably the most important, 
> since I get the impression that there a lot of them running around and 
> the version you have depends upon when you downloaded yours... but it 
> would help if you told me where you got your images and changes files as 
> well ... oh and the os version, too...
> 
> Dale


I've figured it out. Your were right, the newest Cog VM doesn’t exhibit the problem. The problem seems to be the method ZipWriteStream>>deflateBlock:chainLength:goodMatch:. The primitive in that method fails in 4.6 only when I open the 4.6 image with the VM packaged with the 4.5 all-in-one app ('Croquet Closure Cog VM [CoInterpreter VMMaker.oscog-eem.331] 4.5’). The fallback method generates an error.
This is reproducible when using the fallback instead of the primitive with the other VM and a 4.5 image too, so there is definitely something wrong with the Zip implementation. Here’s a snippet for reproducing the problem:

ZipWriteStream removeSelector: #deflateBlock:chainLength:goodMatch:.

(Installer monticello http: 'http://www.squeaksource.com/MetacelloRepository')
	package: 'Gofer-Core-lr.115.mcz';
	install.

(Smalltalk at: #Gofer) new
	url: 'http://seaside.gemstone.com/ss/metacello';
	addPackage: 'ConfigurationOfMetacello';
	load


So no need for you to fix anything about Metacello. Sorry about the fuss.

Cheers,
Max
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