Hi,
On Mon, Oct 19, 2015 at 06:27:34PM +1100, Ben Finney wrote:
> On 19-Oct-2015, Guido Günther wrote:
> 
> > On Mon, Oct 19, 2015 at 12:51:08PM +1100, Ben Finney wrote:
> > > The ‘gbp buildpackage’ command, for a package in “overlay” mode,
> > > should not assume any of the ‘debian/rules’ commands will work in
> > > the absence of the upstream source. That includes ‘clean’.
> > > 
> > > Instead, before issuing the ‘debian/rules clean’ command, the
> > > overlay needs to be assembled: get the upstream source for the
> > > package, then overlay the Debian packaging files onto it. Only
> > > after that can ‘debian/rules clean’ be expected to work in the
> > > exported tree.
> > 
> > I somehow agree here although I don't think the clean command makes much
> > sense in the overlay case
> 
> For comparison, the ‘bzr-buildpackage’ and ‘svn-buildpackage’ tools
> both construct the overlay (they call it “merge with upstream”), and
> then call ‘debian/rules clean’.
> 
> I think ‘bzr-buildpackage’, at least, uses ‘dpkg-buildpackage’ and
> ‘dpkg-source’, which call ‘debian/rules clean’ on the resulting source
> tree.
> 
>     $ bzr-buildpackage --source
>     Building using working tree
>     Building package in merge mode
>     Looking for a way to retrieve the upstream tarball
>     Upstream tarball already exists in build directory, using that
>     Building the package in 
> /home/bignose/Projects/debian/python-adventure/bzr/build-area/python-adventure-1.3,
>  using debuild -S
>      dpkg-buildpackage -rfakeroot -d -us -uc -S
>     dpkg-buildpackage: source package python-adventure
>     dpkg-buildpackage: source version 1.3-1
>     dpkg-buildpackage: source distribution UNRELEASED
>     dpkg-buildpackage: source changed by Ben Finney 
> <ben+deb...@benfinney.id.au>
>      dpkg-source --before-build python-adventure-1.3
>      fakeroot debian/rules clean
>     dh clean --with python3 --buildsystem=pybuild
>        dh_testdir -O--buildsystem=pybuild
>        debian/rules override_dh_auto_clean
>     make[1]: Entering directory 
> '/home/bignose/Projects/debian/python-adventure/bzr/build-area/python-adventure-1.3'
>     dh_auto_clean
>     […]
> 
> This is done so that the ‘debian/rules clean’ target can perform any
> cleaning of the source tree needed before build. This ensures the
> build is repeatable.
> 
> > so just setting the cleaner to /bin/true works around this and maybe
> > we should just skip it in overlay mode altogether?
> 
> I would expect ‘git-buildpackage’ should as closely as feasible mirror
> the overlay behaviour of the original ‘svn-buildpackage’, and later
> ‘bzr-buildpackage’ and ‘hg-buildpackage’.
> 
> That includes, AFAICT, constructing the overlaid source tree, then
> calling ‘debian/rules clean’ (maybe using ‘dpkg-source’ to do it)
> inside the resulting source tree, before continuing the build.

I'd be happy to apply a patch to achieve this behaviour. Given that I'm
not a overlay user myself and currently stall on other things
already. A testcase using e.g. tests/component/deb/test_buildpackage.py
to make sure it doesn't get broken again would be welcome too.
Cheers,
 -- Guido

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