Re: [gentoo-portage-dev] [PATCH v2] install-qa-check: New QA check/cleanup for empty directories

[Michał Górny]

W dniu nie, 28.01.2018 o godzinie 02∶22 -0800, użytkownik Zac Medico
napisał:
> On 01/28/2018 01:50 AM, Michał Górny wrote:
> > Warn about empty directories installed to /var in install-qa-check phase
> > (that were not "filled" using keepdir), to help developers stop relying
> > upon Portage preserving them. Those directories are rather unlikely to
> > be false positives.
> >
> > Furthermore, remove all the empty directories if FEATURES=strict-keepdir
> > is used to catch even more problems (intended for developers). Here
> > warnings are not really suitable since there will be a high number
> > of false positives.
> >
> > The PMS specifies the behavior upon merging empty directories
> > as undefined, and specifically prohibits ebuilds from attempting
> > to install empty directories. However, ebuilds occasionally still fall
> > into the trap of relying on 'dodir' preserving the directory. Make
> > the Portage behavior more strict in order to prevent that.
> > ---
> >  bin/install-qa-check.d/95empty-dirs | 43 +++++++++++++++++++++++++++++++++++++
> >  1 file changed, 43 insertions(+)
> >  create mode 100644 bin/install-qa-check.d/95empty-dirs
> >
> > diff --git a/bin/install-qa-check.d/95empty-dirs b/bin/install-qa-check.d/95empty-dirs
> > new file mode 100644
> > index 000000000..a9cda7fe1
> > --- /dev/null
> > +++ b/bin/install-qa-check.d/95empty-dirs
> > @@ -0,0 +1,43 @@
> > +# Warn about and/or remove empty directories installed by ebuild.
> > +
> > +# Rationale: PMS prohibits ebuilds from installing empty directories.
> > +# Cleaning them up from the installation image provides an easy way
> > +# to make sure that ebuilds are not relying on it while making it easy
> > +# for users to override this if they need to.
> > +#
> > +# The ebuilds that need to preserve empty directories should use keepdir
> > +# as documented e.g.:
> > +# https://devmanual.gentoo.org/function-reference/install-functions/index.html
> > +#
> > +# For now, we emit QA warnings for empty directories in /var.
> > +# Additionally, if FEATURES=strict-keepdir is enabled we explicitly
> > +# remove *all* empty directories to trigger breakage.
> > +
> > +find_empty_dirs() {
> > +	local warn_dirs=()
> > +	local d strip=
> > +
> > +	[[ ${FEATURES} == *strict-keepdir* ]] && strip=1
>
> strict-keepdir has to be added to portage.const.SUPPORTED_FEATURES.
> Maybe also document it in man/make.conf.5?

Will do.

>
> > +
> > +	while IFS= read -r -d $'\0' d; do
> > +		warn_dirs+=( "${d}" )
> > +	done < <(find "${ED}" -mindepth 1 -type d -empty -print0)
> > +
> > +	if [[ ${warn_dirs[@]} ]]; then
> > +		eqawarn "One or more empty directories installed to /var:"
> > +		eqawarn
> > +		for d in "${warn_dirs[@]}"; do
> > +			eqawarn "  ${d#${ED%/}}"
> > +			[[ ${strip} ]] && rmdir "${d}"
>
> Do you also want the strip logic to traverse upwards, removing
> directories that contain only empty directories?

Yes, I suppose I've missed '-depth' here.

>
> > +		done
> > +		eqawarn
> > +		eqawarn "If those directories need to be preserved, please make sure to create"
> > +		eqawarn "or mark them for keeping using 'keepdir'. Future versions of Portage"
> > +		eqawarn "will strip empty directories from installation image."
> > +	fi
> > +}
> > +
> > +find_empty_dirs
> > +: # guarantee successful exit
> > +
> > +# vim:ft=sh
> >
>
>

-- 
Best regards,
Michał Górny