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wg-quick: fsync the temporary file before renaming

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This ensures that on an unclean shutdown, we either see the old content
or the new content, but not empty content.

Suggested-by: Ka Ho Ng <ngkaho1234@gmail.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2017-10-31 18:13:31 +01:00
parent eb181e811c
commit 6e313371cc
1 changed files with 1 additions and 0 deletions
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src/wg-quick.bash
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@ -197,6 +197,7 @@ save_config() {
current_config="$(cmd wg showconf "$INTERFACE")"
trap 'rm -f "$CONFIG_FILE.tmp"; exit' INT TERM EXIT
echo "${current_config/\[Interface\]$'\n'/$new_config}" > "$CONFIG_FILE.tmp" || die "Could not write configuration file"
sync "$CONFIG_FILE.tmp"
mv "$CONFIG_FILE.tmp" "$CONFIG_FILE" || die "Could not move configuration file"
trap - INT TERM EXIT
umask "$old_umask"