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

[Makarius]

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 out-of-date when the user runs the Isabelle GUI, which then tries to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 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.


Also note that "isabelle build" uses SHA1 hash keys on the sources, not
datestamps.


	Makarius

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