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net/dns: fix blank lines being added to resolv.conf on OpenBSD (#13928)

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During resolv.conf update, old 'search' lines are cleared but '\n' is not
deleted, leaving behind a new blank line on every update.

This adds 's' flag to regexp, so '\n' is included in the match and deleted when
old lines are cleared.

Also, insert missing `\n` when updated 'search' line is appended to resolv.conf.

Signed-off-by: Renato Aguiar <renato@renatoaguiar.net>
This commit is contained in:
Renato Aguiar 2024-10-28 08:00:48 -07:00 committed by GitHub
parent 9d1348fe21
commit 5d07c17b93
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1 changed files with 2 additions and 1 deletions
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3
net/dns/resolvd.go
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@ -57,6 +57,7 @@ func (m *resolvdManager) SetDNS(config OSConfig) error {
if len(newSearch) > 1 {
newResolvConf = append(newResolvConf, []byte(strings.Join(newSearch, " "))...)
newResolvConf = append(newResolvConf, '\n')
}
err = m.fs.WriteFile(resolvConf, newResolvConf, 0644)
@ -123,6 +124,6 @@ func (m resolvdManager) readResolvConf() (config OSConfig, err error) {
}
func removeSearchLines(orig []byte) []byte {
re := regexp.MustCompile(`(?m)^search\s+.+$`)
re := regexp.MustCompile(`(?ms)^search\s+.+$`)
return re.ReplaceAll(orig, []byte(""))
}