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providers: setup network kernel arguments in initrd
This adds initial/experimental support for providing supplemental network kernel arguments in the initrd. It is meant to support environment where custom network kargs may be provided via a back-channel. Such arguments are only retrieved and applied on first boot, and their format is defined by dracut [0]. The feature is currently reachable as a dedicated subcommand, but this does not contain any platform-specific implementation. [0] https://mirrors.edge.kernel.org/pub/linux/utils/boot/dracut/dracut.html#_network
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,18 @@ | ||
| [Unit] | ||
| Description=Afterburn Initrd Setup Network Kernel Arguments | ||
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| # This service may produce additional kargs fragments, | ||
| # which are then consumed by dracut-cmdline(8). | ||
| DefaultDependencies=no | ||
| Before=dracut-cmdline.service | ||
| Before=ignition-fetch.service | ||
| After=systemd-journald.socket | ||
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| OnFailure=emergency.target | ||
| OnFailureJobMode=isolate | ||
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| [Service] | ||
| Environment=AFTERBURN_OPT_DEFAULT_VALUE=--default-value=ip=dhcp,dhcp6 | ||
| Environment=AFTERBURN_OPT_PROVIDER=--cmdline | ||
| ExecStart=/usr/bin/afterburn exp rd-network-kargs ${AFTERBURN_OPT_PROVIDER} ${AFTERBURN_OPT_DEFAULT_VALUE} | ||
| Type=oneshot |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,77 @@ | ||
| //! `exp` CLI sub-command. | ||
| use crate::errors::*; | ||
| use crate::{initrd, util}; | ||
| use clap::ArgMatches; | ||
| use error_chain::bail; | ||
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| /// Experimental subcommands. | ||
| #[derive(Debug)] | ||
| pub enum CliExp { | ||
| RdNetworkKargs(CliRdNetworkKargs), | ||
| } | ||
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| impl CliExp { | ||
| /// Parse sub-command into configuration. | ||
| pub(crate) fn parse(app_matches: &ArgMatches) -> Result<super::CliConfig> { | ||
| if app_matches.subcommand_name().is_none() { | ||
| bail!("missing subcommand for 'exp'"); | ||
| } | ||
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| let cfg = match app_matches.subcommand() { | ||
| ("rd-network-kargs", Some(matches)) => CliRdNetworkKargs::parse(matches)?, | ||
| (x, _) => unreachable!("unrecognized subcommand for 'exp': '{}'", x), | ||
| }; | ||
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| Ok(super::CliConfig::Exp(cfg)) | ||
| } | ||
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| // Run sub-command. | ||
| pub(crate) fn run(&self) -> Result<()> { | ||
| match self { | ||
| CliExp::RdNetworkKargs(cmd) => cmd.run()?, | ||
| }; | ||
| Ok(()) | ||
| } | ||
| } | ||
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| /// Sub-command for network kernel arguments. | ||
| #[derive(Debug)] | ||
| pub struct CliRdNetworkKargs { | ||
| platform: String, | ||
| default_kargs: String, | ||
| } | ||
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| impl CliRdNetworkKargs { | ||
| /// Hard-coded fallback for default network arguments. | ||
| const DEFAULT_NETWORK_KARGS: &'static str = "ip=dhcp,dhcp6"; | ||
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| /// Parse sub-command into configuration. | ||
| pub(crate) fn parse(matches: &ArgMatches) -> Result<CliExp> { | ||
| let platform = super::parse_provider(matches)?; | ||
| let default_kargs = matches | ||
| .value_of("default-value") | ||
| .unwrap_or_else(|| Self::DEFAULT_NETWORK_KARGS) | ||
| .to_string(); | ||
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| let cfg = Self { | ||
| platform, | ||
| default_kargs, | ||
| }; | ||
| Ok(CliExp::RdNetworkKargs(cfg)) | ||
| } | ||
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| /// Run the sub-command. | ||
| pub(crate) fn run(&self) -> Result<()> { | ||
| if util::has_network_kargs(super::CMDLINE_PATH)? { | ||
| slog_scope::warn!("kernel cmdline already specifies network arguments, skipping"); | ||
| return Ok(()); | ||
| }; | ||
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| let provider_kargs = initrd::fetch_network_kargs(&self.platform)?; | ||
| let kargs = provider_kargs | ||
| .as_ref() | ||
| .unwrap_or_else(|| &self.default_kargs); | ||
| initrd::write_network_kargs(kargs) | ||
| } | ||
| } |
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