[poky] When SRCREV is set to AUTOREV, what triggers (re-)fetching?

[Evade Flow]

> BTW, the usage of AUTOREV should be updated in BB user manual section 4.4.

Indeed, I did notice this was missing:

  -
https://www.yoctoproject.org/docs/1.6/bitbake-user-manual/bitbake-user-manual.html#auto-revisions

What would have helped me immensely is if this paragraph on AUTOREV in the
Yocto manual:

  -
http://www.yoctoproject.org/docs/1.8/ref-manual/ref-manual.html#var-AUTOREV

contained an extra sentence or two, something like:

Also, be aware that setting [BB_SRCREV_POLICY][1] = "cache" will prevent
> Bitbake from checking whether any upstream repository references have
> changed–even for recipes that have SRCREV = ${AUTOREV}—so you probably
> want to ensure that this variable is set to its default value of "clear"
> when using AUTOREV.
>

>
 [1]:
> https://www.yoctoproject.org/docs/2.1/bitbake-user-manual/bitbake-user-manual.html#var-BB_SRCREV_POLICY
>

A similar admonition in the BB_SRCREV_POLICY description would help, e.g.:

Be aware that setting BB_SRCREV_POLICY = "cache" is generally incompatible
> with the use of [AUTOREV][2], since it will prevent Bitbake from checking
> whether any upstream repository references have changed.


>
 [2]:
> http://www.yoctoproject.org/docs/1.8/ref-manual/ref-manual.html#var-AUTOREV
>

On Fri, Sep 2, 2016 at 2:16 PM, Jianxun Zhang <jianxun.zhang at linux.intel.com
> wrote:

>
> > On Sep 2, 2016, at 7:35 AM, Richard Purdie <richard.purdie@
> linuxfoundation.org> wrote:
> >
> > On Fri, 2016-09-02 at 10:08 -0400, Evade Flow wrote:
> >>> Add ${SRCPV} to your PV (see various recipes in oe-core for
> >> examples), then it’ll know to re-run the tasks when srcrev changes.
> >>
> >> Thanks for confirming that this is 'supposed' to work, that's great
> >> news! Actually, I've already included SRCPV in PV. Here's my recipe,
> >> shorn of comments and an uninteresting do_install_append() function:
> >
> > You don't have BB_SRCREV_POLICY set to cache anywhere do you? It
> > defaults to clear which is what you want...
> >
> > Does "rm tmp/cache -r" 'fix' make it see new revisions? Knowing that
> > would at least help track down the kind of problem you're seeing.
> >
> > What does the full PV look like after expansion? Does it contain an
> > older truncated SRCREV ?
>
> BTW, the usage of AUTOREV should be updated in BB user manual section 4.4.
> It works intuitively for me. But I don’t know the best authentic way to
> document it and any corner case in a patch...
>
> Thanks
>
> >
> > Cheers,
> >
> > Richard
> > --
> > _______________________________________________
> > poky mailing list
> > poky at yoctoproject.org
> > https://lists.yoctoproject.org/listinfo/poky
>
>
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