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dns: ensure to log a warning when writing /etc/resolv.conf fails

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When setting "main.rc-manager=symlink" (the default) and /etc/resolv.conf
is a file, NetworkManager tries to write the file directly. When that fails,
we need to make sure to propagate the error so that we log a warning about that.

With this change:

    <debug> [1583320004.3122] dns-mgr: update-dns: updating plugin systemd-resolved
    <trace> [1583320004.3123] dns-sd-resolved[f9e3febb7424575d]: send-updates: start 8 requests
    <trace> [1583320004.3129] dns-mgr: update-resolv-no-stub: '/var/run/NetworkManager/no-stub-resolv.conf' successfully written
    <trace> [1583320004.3130] dns-mgr: update-resolv-conf: write to /etc/resolv.conf failed (rc-manager=symlink, $ERROR_REASON)
    <trace> [1583320004.3132] dns-mgr: update-resolv-conf: write internal file /var/run/NetworkManager/resolv.conf succeeded
    <trace> [1583320004.3133] dns-mgr: current configuration: [{ [...] }]
    <warn>  [1583320004.3133] dns-mgr: could not commit DNS changes: $ERROR_REASON
    <info>  [1583320004.3134] device (eth0): Activation: successful, device activated.

https://bugzilla.redhat.com/show_bug.cgi?id=1809181
This commit is contained in:
Thomas Haller 2020-03-04 12:08:03 +01:00
parent 0549351111
commit 324f67956a
1 changed files with 6 additions and 4 deletions
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10
src/dns/nm-dns-manager.c
View file

@ -860,9 +860,11 @@ update_resolv_conf (NMDnsManager *self,
if (!g_file_set_contents (rc_path, content, -1, &local)) {
_LOGT ("update-resolv-conf: write to %s failed (rc-manager=%s, %s)",
rc_path, _rc_manager_to_string (rc_manager), local->message);
write_file_result = SR_ERROR;
g_propagate_error (error, local);
/* clear @error, so that we don't try reset it. This is the error
* we want to propagate to the caller. */
error = NULL;
write_file_result = SR_ERROR;
} else {
_LOGT ("update-resolv-conf: write to %s succeeded (rc-manager=%s)",
rc_path, _rc_manager_to_string (rc_manager));
@ -930,7 +932,7 @@ update_resolv_conf (NMDnsManager *self,
if ( rc_manager != NM_DNS_MANAGER_RESOLV_CONF_MAN_SYMLINK
|| !_read_link_cached (_PATH_RESCONF, &resconf_link_cached, &resconf_link)) {
_LOGT ("update-resolv-conf: write internal file %s succeeded", MY_RESOLV_CONF);
return SR_SUCCESS;
return write_file_result;
}
if (!nm_streq0 (_read_link_cached (_PATH_RESCONF, &resconf_link_cached, &resconf_link),
@ -938,7 +940,7 @@ update_resolv_conf (NMDnsManager *self,
_LOGT ("update-resolv-conf: write internal file %s succeeded (don't touch symlink %s linking to %s)",
MY_RESOLV_CONF, _PATH_RESCONF,
_read_link_cached (_PATH_RESCONF, &resconf_link_cached, &resconf_link));
return SR_SUCCESS;
return write_file_result;
}
/* By this point, /etc/resolv.conf exists and is a symlink to our internal
@ -991,7 +993,7 @@ update_resolv_conf (NMDnsManager *self,
_LOGT ("update-resolv-conf: write internal file %s succeeded and update symlink %s",
MY_RESOLV_CONF, _PATH_RESCONF);
return SR_SUCCESS;
return write_file_result;
}
static void