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use std::ffi::OsString;
use std::fs;
use std::path::{Path, PathBuf};
use std::process::Command;
use anyhow::{bail, Context, Result};
use sha2::{Digest, Sha256};
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct KernelVersion(String);
impl KernelVersion {
pub fn discover_rt(rootfs: &Path) -> Result<Self> {
let boot = rootfs.join("boot");
let entries = fs::read_dir(&boot)
.with_context(|| format!("read boot directory {}", boot.display()))?;
let mut kernels = entries
.filter_map(|entry| entry.ok())
.filter_map(|entry| {
let file_type = entry.file_type().ok()?;
if !file_type.is_file() {
return None;
}
let name = entry.file_name();
let name = name.to_str()?;
let version = name.strip_prefix("vmlinuz-")?;
(version.contains("rt")).then(|| version.to_owned())
})
.collect::<Vec<_>>();
kernels.sort();
match kernels.as_slice() {
[] => bail!("no RT kernel image found in {}", boot.display()),
[version] => Ok(Self(version.clone())),
_ => bail!("multiple RT kernel images found in {}: {}", boot.display(), kernels.join(", ")),
}
}
pub fn as_str(&self) -> &str {
&self.0
}
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct InitramfsRecipe {
features: Vec<String>,
modules: Vec<String>,
}
impl InitramfsRecipe {
pub fn new(
features: impl IntoIterator<Item = impl Into<String>>,
modules: impl IntoIterator<Item = impl Into<String>>,
) -> Result<Self> {
let mut features = normalize("initrd feature", features)?;
let mut modules = normalize("initrd module", modules)?;
features.sort();
features.dedup();
modules.sort();
modules.dedup();
Ok(Self { features, modules })
}
pub fn render(&self) -> String {
format!(
"FEATURES += {}\nMODULES += {}\n",
self.features.join(" "),
self.modules.join(" ")
)
}
}
fn normalize(kind: &str, values: impl IntoIterator<Item = impl Into<String>>) -> Result<Vec<String>> {
values
.into_iter()
.map(Into::into)
.map(|value: String| {
if value.trim().is_empty() || value.chars().any(char::is_whitespace) {
bail!("{kind} cannot be empty or contain whitespace");
}
Ok(value)
})
.collect()
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct InitramfsRequest {
rootfs: PathBuf,
kernel: KernelVersion,
}
impl InitramfsRequest {
pub fn discover(rootfs: impl AsRef<Path>) -> Result<Self> {
let rootfs = rootfs.as_ref();
if !rootfs.is_dir() {
bail!("rootfs is not a directory: {}", rootfs.display());
}
Ok(Self {
rootfs: rootfs.to_path_buf(),
kernel: KernelVersion::discover_rt(rootfs)?,
})
}
pub fn rootfs(&self) -> &Path {
&self.rootfs
}
pub fn kernel(&self) -> &KernelVersion {
&self.kernel
}
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct Invocation {
program: OsString,
arguments: Vec<OsString>,
}
impl Invocation {
pub fn new(program: impl Into<OsString>, arguments: impl IntoIterator<Item = impl Into<OsString>>) -> Self {
Self { program: program.into(), arguments: arguments.into_iter().map(Into::into).collect() }
}
}
pub trait CommandRunner {
fn run(&mut self, invocation: Invocation) -> Result<()>;
}
#[derive(Debug, Default)]
pub struct ProcessRunner;
impl CommandRunner for ProcessRunner {
fn run(&mut self, invocation: Invocation) -> Result<()> {
let status = Command::new(&invocation.program)
.args(&invocation.arguments)
.status()
.with_context(|| format!("run {}", invocation.program.to_string_lossy()))?;
if !status.success() {
bail!("{} exited with {status}", invocation.program.to_string_lossy());
}
Ok(())
}
}
pub trait InitramfsBuilder {
fn build(&mut self, request: &InitramfsRequest) -> Result<InitramfsResult>;
}
#[derive(Debug)]
pub struct MakeInitrdBuilder<R> {
runner: R,
}
impl<R> MakeInitrdBuilder<R> {
pub fn new(runner: R) -> Self {
Self { runner }
}
pub fn runner(&self) -> &R {
&self.runner
}
}
impl<R: CommandRunner> InitramfsBuilder for MakeInitrdBuilder<R> {
fn build(&mut self, request: &InitramfsRequest) -> Result<InitramfsResult> {
self.runner.run(Invocation::new(
"chroot",
[
request.rootfs().as_os_str().to_owned(),
"make-initrd".into(),
"-k".into(),
request.kernel().as_str().into(),
],
))?;
InitramfsResult::from_rootfs(request.rootfs(), request.kernel())
}
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct InitramfsResult {
initrd_path: PathBuf,
sha256: String,
}
impl InitramfsResult {
/// Record the generated initrd as a rootfs-relative semantic fact.
pub fn from_rootfs(rootfs: &Path, kernel: &KernelVersion) -> Result<Self> {
let initrd_path = PathBuf::from(format!("boot/initrd-{}.img", kernel.as_str()));
let contents = fs::read(rootfs.join(&initrd_path))
.with_context(|| format!("read generated initrd {}", initrd_path.display()))?;
Ok(Self { initrd_path, sha256: format!("{:x}", Sha256::digest(contents)) })
}
pub fn initrd_path(&self) -> &Path {
&self.initrd_path
}
pub fn sha256(&self) -> &str {
&self.sha256
}
}
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