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authorGravatar Rolf Eike Beer <eb@emlix.com>2019-03-28 15:29:29 +0100
committerGravatar Denys Vlasenko <vda.linux@googlemail.com>2019-04-13 16:58:00 +0200
commit7180d9ed863e6ea350938b13384548f4f2617528 (patch)
treee6f7216d2219f243379796b72d52f3bf76e32b19 /examples
parent0e7bd69bb58e0914f25e3543e6beb142a203738c (diff)
downloadbusybox-7180d9ed863e6ea350938b13384548f4f2617528.tar.gz
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examples/udhcp/simple.script: fix resolv.conf update if it is a dangling symlink
If /etc/resolv.conf is a symlink to a tmpfs and the actual file does not already exist, "readlink -f" will not detect it as symlink. Explicitely check for that condition before and touch the file, making the other code work as intended. Signed-off-by: Rolf Eike Beer <eb@emlix.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'examples')
-rwxr-xr-xexamples/udhcp/simple.script4
1 files changed, 4 insertions, 0 deletions
diff --git a/examples/udhcp/simple.script b/examples/udhcp/simple.script
index 44aa46ece..53974e6d6 100755
--- a/examples/udhcp/simple.script
+++ b/examples/udhcp/simple.script
@@ -55,6 +55,10 @@ case "$1" in
echo "Recreating $RESOLV_CONF"
# If the file is a symlink somewhere (like /etc/resolv.conf
# pointing to /run/resolv.conf), make sure things work.
+ if test -L "$RESOLV_CONF"; then
+ # If it's a dangling symlink, try to create the target.
+ test -e "$RESOLV_CONF" || touch "$RESOLV_CONF"
+ fi
realconf=$(readlink -f "$RESOLV_CONF" 2>/dev/null || echo "$RESOLV_CONF")
tmpfile="$realconf-$$"
> "$tmpfile"