[gentoo-dev] Re: [RFC] Major changes to the Gnome2 Eclasses

[Steve Long]

Rémi Cardona wrote:

> Now, basically, if the portage metadata or QA people could tell me a way
> to figure *all* the ebuilds that inherit gnome2 *and* have a
> pkg_preinst() function somewhere (either in the ebuild or in an eclass
> somewhere) I'd really appreciate it, as I really don't want to read
> through thousands of ebuilds to figure it out.
>
PORTDIR=$(portageq envvar PORTDIR)
# Get eclasses which export pkg_preinst()
preEclass=($(qgrep -EeCl 'EXPORT_FUNCTIONS.*pkg_preinst'))
# We don't want the eclass/ prefix
preEclass=("${preEclass[@]/#eclass\/}")
# or the .eclass suffix
preEclass=("${preEclass[@]/%.eclass}")
# make a regex for an ebuild with a pkg_preinst, or inheriting one
# of the eclasses
IFS='|'
search="^[[:space:]]*(pkg_preinst\(\)|inherit .*(${preEclass[*]}))"
unset IFS
# find matching ebuilds
while read ebuild; do grep -El "$search" "$PORTDIR/$ebuild"
done< <(qgrep -Cel 'inherit .*gnome2')
# just the packages (would need to count dirs in PORTDIR and amend awk
# accordingly to use the env var)
while read ebuild; do grep -El "$search" "/usr/portage/$ebuild"
done< <(qgrep -Cel 'inherit .*gnome2') | \
  awk -F/ '!s[$4"/"$5]++ { print $4"/"$5 }'

If you wanted to do something with the files, you'd use:
grep -Eq "$search" "$PORTDIR/$ebuild" && files+=("$PORTDIR/$ebuild")
in the loop, and then access the "${files[@]}" array after. You can't do
that with a pipe, see http://wooledge.org/mywiki/BashFAQ/024


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