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examples/udhcp/simple.script: fix resolv.conf update if it is a dangling symlink

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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>
This commit is contained in:
Rolf Eike Beer 2019-03-28 15:29:29 +01:00 committed by Denys Vlasenko
parent 0e7bd69bb5
commit 7180d9ed86
1 changed files with 4 additions and 0 deletions
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examples/udhcp/simple.script
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@ -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"