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63 lines
2.1 KiB
63 lines
2.1 KiB
From c9fd1e80d3c87e1f844edcd86e9d36ae499ce717 Mon Sep 17 00:00:00 2001
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From: Gris Ge <fge@redhat.com>
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Date: Sun, 23 Apr 2023 16:01:29 +0800
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Subject: [PATCH] cli: Do nothing for `persist-nic-names` when got
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`net.ifnames=0`
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When `net.ifnames=0` is defined in kernel argument, systemd will disable
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the predicable network interface name which make no sense for nmstate to
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pin the interface names. Hence we do nothing in `persist-nic-names` in
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that case.
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Manually tested in CentOS stream 9 VM.
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Signed-off-by: Gris Ge <fge@redhat.com>
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---
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rust/src/cli/persist_nic.rs | 19 +++++++++++++++++++
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1 file changed, 19 insertions(+)
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diff --git a/rust/src/cli/persist_nic.rs b/rust/src/cli/persist_nic.rs
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index 6b126d58..61b07dbb 100644
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--- a/rust/src/cli/persist_nic.rs
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+++ b/rust/src/cli/persist_nic.rs
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@@ -7,6 +7,8 @@
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//!
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//! The logic currently is:
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//!
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+//! - Do nothing if kernel argument contains `net.ifnames=0` which disabled the
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+//! predicable network interface name, hence not fit our use case here.
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//! - Iterate over all active NICs
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//! - Pin every ethernet interface to its MAC address (prefer permanent MAC
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//! address)
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@@ -70,6 +72,14 @@ pub(crate) fn run_persist_immediately(
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PersistAction::CleanUpDryRun => return clean_up(root, true),
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};
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+ if is_prediable_ifname_disabled() {
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+ log::info!(
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+ "Systemd predicable network interface name is disabled \
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+ by kernel argument `net.ifnames=0`, will do nothing"
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+ );
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+ return Ok("".to_string());
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+ }
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+
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let stamp_path = Path::new(root)
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.join(SYSTEMD_NETWORK_LINK_FOLDER)
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.join(NMSTATE_PERSIST_STAMP);
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@@ -317,3 +327,12 @@ fn is_nmstate_generated_systemd_link_file(file_path: &PathBuf) -> bool {
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.map(|_| buff == PERSIST_GENERATED_BY.as_bytes())
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.unwrap_or_default()
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}
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+
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+const KERNEL_CMDLINE_FILE: &str = "/proc/cmdline";
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+
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+fn is_prediable_ifname_disabled() -> bool {
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+ std::fs::read(KERNEL_CMDLINE_FILE)
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+ .map(|v| String::from_utf8(v).unwrap_or_default())
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+ .map(|c| c.contains("net.ifnames=0"))
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+ .unwrap_or_default()
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+}
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--
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2.40.0
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