[PATCH] backup.pl: Fixes bug13734 - tar treats colon in filename as remote location

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

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- When a user tries to restore on the console from a backup on IPFire that has a colon in
   the filename the tar treats this as meaning that everything after the colon is
   information about a remote location to do the extraction to. This results in a filename
   that cannot be found, and a remote location that is not correct and the tar operation
   fails.
- This has been confirmed by myself.
- If the user tries a restore from a file downloaded to another computer then for most, if
   not all browsers, the colon will have been replaced by an underscore or other character.
   Firefox, Chromium and Vivaldi do this.
- So any backup file that is selected to be restored using the WUI will no longer have a
   colon in the filename.
- This patch adds --force-local to the tar command, which means that tar will treat the
   colon as a character in the filename. This will ensure that if a user has any backup
   files stored on their IPFire system, with a colon in the filename then doing a restore
   from this file will not cause tar to fail.
- The NOW variable is also changed to replace the colon by a dash and to separate the date
   and time by an underscore. This filename will be accepted by browsers, without doing
   any replacements. Tested out with Firefox, Chromium & Vivaldi.
- The above ensures that both the new and old filename versions will work for doing a
   restore.

Fixes: bug13734
Tested-by: Adolf Belka <adolf.belka(a)ipfire.org>
Signed-off-by: Adolf Belka <adolf.belka(a)ipfire.org>
---
 config/backup/backup.pl | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/config/backup/backup.pl b/config/backup/backup.pl
index d848084e9..7b2f95304 100644
--- a/config/backup/backup.pl
+++ b/config/backup/backup.pl
@@ -2,7 +2,7 @@
 ###############################################################################
 #                                                                             #
 # IPFire.org - A linux based firewall                                         #
-# Copyright (C) 2007-2022  IPFire Team  <info(a)ipfire.org>                     #
+# Copyright (C) 2007-2024  IPFire Team  <info(a)ipfire.org>                     #
 #                                                                             #
 # This program is free software: you can redistribute it and/or modify        #
 # it under the terms of the GNU General Public License as published by        #
@@ -21,7 +21,7 @@
 
 shopt -s nullglob
 
-NOW="$(date "+%Y-%m-%d-%H:%M")"
+NOW="$(date "+%Y-%m-%d_%H-%M")"
 
 list_addons() {
 	local file
@@ -82,7 +82,8 @@ restore_backup() {
 	# Extract backup
 	if ! tar xvzpf "${filename}" -C / \
 			--exclude-from="/var/ipfire/backup/exclude" \
-			--exclude-from="/var/ipfire/backup/exclude.user"; then
+			--exclude-from="/var/ipfire/backup/exclude.user" \
+			--force-local; then
 		echo "Could not extract backup" >&2
 		return 1
 	fi
-- 
2.45.2