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Merge pull request #5135 from jmarrero/override-replace-kernel
kernel-install: integration
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,121 @@ | ||
| //! Integration with the systemd-owned /sbin/kernel-install tooling. | ||
| //! | ||
| //! Note that there's two different phases of kernel handling: | ||
| //! | ||
| //! - build time | ||
| //! - deployment time (owned by ostree) | ||
| //! | ||
| //! This code is wholly concerned with "build time" today. The | ||
| //! "deployment time" logic is owned entirely by ostree. | ||
| //! | ||
| // SPDX-License-Identifier: Apache-2.0 OR MIT | ||
|
|
||
| use std::fs::File; | ||
| use std::io::{BufRead, BufReader}; | ||
| use std::path::Path; | ||
| use std::process::Command; | ||
|
|
||
| use anyhow::{Context, Result}; | ||
| use cap_std::fs::Dir; | ||
| use cap_std_ext::cap_std; | ||
| use cap_std_ext::dirext::CapStdExtDirExt; | ||
| use fn_error_context::context; | ||
|
|
||
| /// Parsed by kernel-install and set in the environment | ||
| const LAYOUT_VAR: &str = "KERNEL_INSTALL_LAYOUT"; | ||
| /// The value we expect to find for layout | ||
| const LAYOUT_OSTREE: &str = "ostree"; | ||
| /// What we should emit to skip further processing | ||
| const SKIP: u8 = 77; | ||
| /// The path to the kernel modules | ||
| const MODULES: &str = "usr/lib/modules"; | ||
| /// The default name for the initramfs. | ||
| const INITRAMFS: &str = "initramfs.img"; | ||
| /// The path to the instal.conf that sets layout. | ||
| const KERNEL_INSTALL_CONF: &str = "/usr/lib/kernel/install.conf"; | ||
|
|
||
| #[context("Verifying kernel-install layout file")] | ||
| pub fn is_ostree_layout() -> Result<bool> { | ||
| let install_conf = Path::new(KERNEL_INSTALL_CONF); | ||
| if !install_conf.is_file() { | ||
| tracing::debug!("can not read /usr/lib/kernel/install.conf"); | ||
| return Ok(false); | ||
| } | ||
| let buff = BufReader::new( | ||
| File::open(install_conf).context("Failed to open /usr/lib/kernel/install.conf")?, | ||
| ); | ||
| // Check for "layout=ostree" in the file | ||
| for line in buff.lines() { | ||
| let line = line.context("Failed to read line")?; | ||
| if line.trim() == "layout=ostree" { | ||
| return Ok(true); | ||
| } | ||
| } | ||
| Ok(false) | ||
| } | ||
|
|
||
| #[context("Adding kernel")] | ||
| fn add(root: &Dir, argv: &[&str]) -> Result<()> { | ||
| let mut argv_it = argv.iter().copied(); | ||
| let Some(kver) = argv_it.next() else { | ||
| anyhow::bail!("No kernel version provided"); | ||
| }; | ||
| tracing::debug!("Installing kernel kver={kver}"); | ||
| println!("Generating initramfs"); | ||
| crate::initramfs::run_dracut(root, &kver)?; | ||
| println!("Running depmod"); | ||
| let st = Command::new("depmod") | ||
| .args(["-a", kver]) | ||
| .status() | ||
| .context("Invoking depmod")?; | ||
| if !st.success() { | ||
| anyhow::bail!("Failed to run depmod: {st:?}"); | ||
| } | ||
| Ok(()) | ||
| } | ||
|
|
||
| #[context("Removing kernel")] | ||
| fn remove(root: &Dir, kver: &str) -> Result<()> { | ||
| tracing::debug!("Removing kernel kver={kver}"); | ||
| let kdir = format!("{MODULES}/{kver}"); | ||
| let Some(kernel_dir) = root.open_dir_optional(&kdir)? else { | ||
| return Ok(()); | ||
| }; | ||
| // We generate the initramfs, so remove it if it exists. | ||
| kernel_dir.remove_file_optional(INITRAMFS)?; | ||
| Ok(()) | ||
| } | ||
|
|
||
| /// Primary entrypoint to `/usr/lib/kernel-install.d/05-rpmostree.install`. | ||
| #[context("rpm-ostree kernel-install")] | ||
| pub fn main(argv: &[&str]) -> Result<u8> { | ||
| let Some(layout) = std::env::var_os(LAYOUT_VAR) else { | ||
| return Ok(0); | ||
| }; | ||
| tracing::debug!("The LAYOUT_OSTREE is: {:?}", layout.to_str()); | ||
| if !matches!(layout.to_str(), Some(LAYOUT_OSTREE)) { | ||
| return Ok(0); | ||
| } | ||
| if !ostree_ext::container_utils::is_ostree_container()? { | ||
| eprintln!( | ||
| "warning: confused state: {LAYOUT_VAR}={LAYOUT_OSTREE} but not in an ostree container" | ||
| ); | ||
| return Ok(0); | ||
| } | ||
| let root = &Dir::open_ambient_dir("/", cap_std::ambient_authority())?; | ||
| tracing::debug!("argv={argv:?}"); | ||
| match argv { | ||
| [_, _, "add", rest @ ..] => { | ||
| add(root, rest)?; | ||
| // In the case of adding a new kernel, we intercept everything else | ||
| // today. In the future we can try to ensure we reuse what bits are there. | ||
| Ok(SKIP) | ||
| } | ||
| [_, _, "remove", kver, ..] => { | ||
| remove(root, kver)?; | ||
| Ok(0) | ||
| } | ||
| _ => Ok(0), | ||
| } | ||
| } |
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