[PR PATCH] Fix empty dir check in i686 masterdirs.

[voidlinux-github@inbox.vuxu.org]

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There is a new pull request by Johnnynator against master on the void-packages repository

https://github.com/Johnnynator/void-packages lib32
https://github.com/void-linux/void-packages/pull/15654

Fix empty dir check in i686 masterdirs.
See e.g. https://travis-ci.org/void-linux/void-packages/builds/600443626?utm_source=github_status&utm_medium=notification , all of the builds should have failed, but i686 created a empty package even without the `meta` build_style. The issue was that the `lib32 -> lib` symlink still existed at the point of checking for empty dir, so `/usr` was in fact not empty, but is at `do_pkg`. Reordering the hooks fixes this but reveals another issue, namely that `rmdir -p` will remove even `/destdir` and would therefore break actual meta packages.

A patch file from https://github.com/void-linux/void-packages/pull/15654.patch is attached

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From 96b0edd68f77e041808c60c7100dd1ada392022d Mon Sep 17 00:00:00 2001
From: John <johnz@posteo.net>
Date: Mon, 21 Oct 2019 00:16:31 +0200
Subject: [PATCH 1/2] hooks/post-install: do remove lib32 symlink before
 checking for empty dirs

this resulted in empty i686 packages never getting flagged as empty
since the /usr/lib32 -> lib symlink was only removed after the check
---
 common/hooks/post-install/{98-lib32.sh => 00-lib32.sh} | 0
 1 file changed, 0 insertions(+), 0 deletions(-)
 rename common/hooks/post-install/{98-lib32.sh => 00-lib32.sh} (100%)

diff --git a/common/hooks/post-install/98-lib32.sh b/common/hooks/post-install/00-lib32.sh
similarity index 100%
rename from common/hooks/post-install/98-lib32.sh
rename to common/hooks/post-install/00-lib32.sh

From 5e13391dc0e6626c4075ced12924414fd92e2038 Mon Sep 17 00:00:00 2001
From: John <johnz@posteo.net>
Date: Mon, 21 Oct 2019 00:13:40 +0200
Subject: [PATCH 2/2] hooks/post-install/03-remove-empty-dirs.sh: use find
 -delete instead of rmdir -p

rmdir -p could end up deleting even /destdir when a empty package would
not have any subpackages with a i686 masterdir.
---
 common/hooks/post-install/03-remove-empty-dirs.sh | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/common/hooks/post-install/03-remove-empty-dirs.sh b/common/hooks/post-install/03-remove-empty-dirs.sh
index 4b7122938ab..c54f458f61e 100644
--- a/common/hooks/post-install/03-remove-empty-dirs.sh
+++ b/common/hooks/post-install/03-remove-empty-dirs.sh
@@ -2,13 +2,9 @@
 
 hook() {
     if [ -d "${PKGDESTDIR}" ]; then
-        find "${PKGDESTDIR}" -type d -empty|sort -r|while read f; do
+        find "${PKGDESTDIR}" -mindepth 1 -type d -empty -print -delete|sort -r|while read f; do
             _dir="${f##${PKGDESTDIR}}"
-            [ -z "${_dir}" ] && continue
-            rmdir --ignore-fail-on-non-empty -p "$f" &>/dev/null
             msg_warn "$pkgver: removed empty dir: ${_dir}\n"
         done
-        # Create PKGDESTDIR in case it has been removed previously.
-        mkdir -p ${PKGDESTDIR}
     fi
 }