[PATCH] backup.pl: fix Bug12817 - directories missing in backup after include file changed to relat>

[Adolf Belka <adolf.belka@ipfire.org>]

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From: Bernhard Bitsch <bbitsch(a)ipfire.org>

- The change of the backup include file from absolute paths to relative paths in CU164
   commit https://git.ipfire.org/?p=ipfire-2.x.git;a=commit;h=c7e0d73e7cfd7be95db9d0a5f3392b8241813d5b
   resulted in 20 core function directories no longer being backed up. Additionally a
   similar effect occurred with some addon backups
- Fix applied here proposed by Bernhard Bitsch and tested on a vm testbed system and
   confirmed to fix the problem. Backup of all directories again being done.

Fixes: Bug12817
Tested-By: Adolf Belka <adolf.belka(a)ipfire.org>
Signed-off-by: Adolf Belka <adolf.belka(a)ipfire.org>
---
 config/backup/backup.pl | 22 ++++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/config/backup/backup.pl b/config/backup/backup.pl
index a2337cf23..c7dbc6cae 100644
--- a/config/backup/backup.pl
+++ b/config/backup/backup.pl
@@ -35,16 +35,18 @@ list_addons() {
 process_includes() {
 	local include
 
-	for include in $@; do
-		local file
-		while read -r file; do
-			for file in ${file}; do
-				if [ -e "/${file}" ]; then
-					echo "${file}"
-				fi
-			done
-		done < "${include}"
-	done | sort -u
+    pushd / >/dev/null
+     	for include in $@; do
+	    	local file
+	    	while read -r file; do
+	    		for file in ${file}; do
+	    			if [ -e "/${file}" ]; then
+	    				echo "${file}"
+	    			fi
+	    		done
+	    	done < "${include}"
+	    done | sort -u
+    popd >/dev/null
 }
 
 make_backup() {
-- 
2.35.1