[source] base-files: also generate configs when current is empty (FS#193)

[LEDE Commits]

nbd pushed a commit to source.git, branch master:
https://git.lede-project.org/0f27096100a33421bff0d4539d428fe393eebe22

commit 0f27096100a33421bff0d4539d428fe393eebe22
Author: Koen Vandeputte <koen.vandeputte at ncentric.com>
AuthorDate: Wed Oct 5 11:26:35 2016 +0200

    base-files: also generate configs when current is empty (FS#193)
    
    Before a configuration is generated, an empty file is created to store
    it in. (required by UCI)
    
    If something happens during config generation
    (power cut, interruption, ..) an empty file exists and it is never
    regenerated again, causing some daemons to fail starting
    (NTPD, logread, ..)
    
    Fix this by also generating new configs if a critical file
    is empty.
    
    Signed-off-by: Koen Vandeputte <koen.vandeputte at ncentric.com>
---
 package/base-files/files/bin/board_detect    | 4 ++--
 package/base-files/files/bin/config_generate | 8 ++++----
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/package/base-files/files/bin/board_detect b/package/base-files/files/bin/board_detect
index f9640f0..441db6a 100755
--- a/package/base-files/files/bin/board_detect
+++ b/package/base-files/files/bin/board_detect
@@ -4,11 +4,11 @@ CFG=$1
 
 [ -n "$CFG" ] || CFG=/etc/board.json
 
-[ -d "/etc/board.d/" -a ! -f "$CFG" ] && {
+[ -d "/etc/board.d/" -a ! -s "$CFG" ] && {
 	for a in `ls /etc/board.d/*`; do
 		[ -x $a ] || continue;
 		$(. $a)
 	done
 }
 
-[ -f "$CFG" ] || return 1
+[ -s "$CFG" ] || return 1
diff --git a/package/base-files/files/bin/config_generate b/package/base-files/files/bin/config_generate
index 80ed61b..80e5c9f 100755
--- a/package/base-files/files/bin/config_generate
+++ b/package/base-files/files/bin/config_generate
@@ -4,8 +4,8 @@ CFG=/etc/board.json
 
 . /usr/share/libubox/jshn.sh
 
-[ -f $CFG ] || /bin/board_detect || exit 1
-[ -f /etc/config/network -a -f /etc/config/system ] && exit 0
+[ -s $CFG ] || /bin/board_detect || exit 1
+[ -s /etc/config/network -a -s /etc/config/system ] && exit 0
 
 generate_static_network() {
 	uci -q batch <<-EOF
@@ -401,7 +401,7 @@ generate_gpioswitch() {
 json_init
 json_load "$(cat ${CFG})"
 
-if [ ! -f /etc/config/network ]; then
+if [ ! -s /etc/config/network ]; then
 	touch /etc/config/network
 	generate_static_network
 
@@ -412,7 +412,7 @@ if [ ! -f /etc/config/network ]; then
 	for key in $keys; do generate_switch $key; done
 fi
 
-if [ ! -f /etc/config/system ]; then
+if [ ! -s /etc/config/system ]; then
 	touch /etc/config/system
 	generate_static_system