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From dfd454d377c90f5a039c6a8487703dd604bffabc Mon Sep 17 00:00:00 2001
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Message-Id: <dfd454d377c90f5a039c6a8487703dd604bffabc@dist-git>
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From: Michal Privoznik <mprivozn@redhat.com>
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Date: Thu, 26 Jul 2018 11:41:09 +0200
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Subject: [PATCH] networkGetDHCPLeases: Don't always report error if unable to
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read leases file
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https://bugzilla.redhat.com/show_bug.cgi?id=1600468
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If we are unable to read leases file (no matter what the reason
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is), we return 0 - just like if there were no leases. However,
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because we use virFileReadAll() an error is printed into the log.
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Note that not all networks have leases file - only those for
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which we start dnsmasq.
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Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
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Reviewed-by: Erik Skultety <eskultet@redhat.com>
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(cherry picked from commit 142c4b10fd8f55b7d2e86f5a184608da70f2edd3)
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Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
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Reviewed-by: Erik Skultety <eskultet@redhat.com>
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---
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src/network/bridge_driver.c | 21 ++++++++++++++-------
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1 file changed, 14 insertions(+), 7 deletions(-)
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diff --git a/src/network/bridge_driver.c b/src/network/bridge_driver.c
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index ac849581ec..1ad95d524c 100644
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--- a/src/network/bridge_driver.c
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+++ b/src/network/bridge_driver.c
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@@ -4157,13 +4157,20 @@ networkGetDHCPLeases(virNetworkPtr net,
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custom_lease_file = networkDnsmasqLeaseFileNameCustom(driver, def->bridge);
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/* Read entire contents */
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- if ((custom_lease_file_len = virFileReadAll(custom_lease_file,
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- VIR_NETWORK_DHCP_LEASE_FILE_SIZE_MAX,
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- &lease_entries)) < 0) {
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- /* Even though src/network/leaseshelper.c guarantees the existence of
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- * leases file (even if no leases are present), and the control reaches
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- * here, instead of reporting error, return 0 leases */
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- rv = 0;
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+ if ((custom_lease_file_len = virFileReadAllQuiet(custom_lease_file,
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+ VIR_NETWORK_DHCP_LEASE_FILE_SIZE_MAX,
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+ &lease_entries)) < 0) {
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+ /* Not all networks are guaranteed to have leases file.
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+ * Only those which run dnsmasq. Therefore, if we failed
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+ * to read the leases file, don't report error. Return 0
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+ * leases instead. */
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+ if (errno == ENOENT) {
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+ rv = 0;
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+ } else {
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+ virReportSystemError(errno,
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+ _("Unable to read leases file: %s"),
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+ custom_lease_file);
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+ }
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goto error;
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}
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--
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2.18.0
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