[isabelle-dev] Support in `isabelle build` for SOURCE_DATE_EPOCH

[Makarius]

On 30/11/2018 16:30, Jonathon Fernyhough wrote:
> On 30/11/2018 14:55, Makarius wrote:
>> On 30/11/2018 14:15, Jonathon Fernyhough wrote:
>>>
>>> I'm currently packaging Isabelle2018 (in deb format) for deployment to
>>> several machines. These packages should contain some default heaps so
>>> users can get on with what they're doing and avoid duplicating hundreds
>>> of megabytes of data across user profiles.
>>>
>>> I'm trying to automate the heap build process using the debian/rules
>>> file in the "standard" way but the generated heaps are seen as
>>> out-of-date when the user runs the Isabelle GUI, which then tries to
>>> regenerate the heaps (and fails because the system directory isn't
>>> writable).
>>
>> There is no point do "debianize" Isabelle: it is a plain user-space
>> application program, not a system component.
>>
> 
> You're correct that there's no need to do this if you're a single user
> running Isabelle on a single machine.

Isabelle dates back from a time of multi-user / multi-platform
installations, although that is rarely used these days. This scheme
still works. It is even more general than Debianization.


> However, a Debian packaging file is the correct approach for local
> deployment to multiple Debian/Ubuntu machines.

It is one approach, but typically causes problems.


>> You should be able to achive the above without deb packaging like this:
>>
>>   * unpack the Isabelle tar.gz
>>   * run "Isabelle/bin/isabelle build -s -b HOL" (or any other images
>> that users might need)
>>   * copy the result to the target (e.g. via "cp -a" or as a tar.gz)
>>
>> Here "Isabelle" refers to any Isabelle distribution from recent years:
>> it is normal that Isabelle users have more than one of it active.
> 
> I suppose that would be a workaround - build the heaps as part of
> packaging process but archive them, then extract them during installation.

Isn't this the normal way of packaging build artifacts?


>> Also note that "isabelle build" uses SHA1 hash keys on the sources, not
>> datestamps.
> 
> This raises a different question of why the **sources** SHA1 hashes are
> different between the packaging chroot (pbuild/sbuild) and the local system.
> 
> What is being hashed? A full path or just the filename?

Just the content of everything that is required: sources, other heaps etc.

There is one side-condition: the file-system needs to be reasonably sane
to allow folding file names back to the symbolic form of ~~/src/HOL/ROOT
etc. -- my guess it that the funny Debian build environment somehow
destroys that.


(BTW: nothing of this is relevant to the isabelle-dev mailing list.)


	Makarius

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