refactor boot selection algorithm
This commit is contained in:
parent
8f8cbab72f
commit
d244c07483
@ -1,140 +0,0 @@
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use libcitadel::{Partition,Result,ImageHeader};
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pub struct BootSelection {
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partitions: Vec<Partition>,
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}
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impl BootSelection {
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pub fn choose_install_partition() -> Result<Partition> {
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let bs = BootSelection::load_partitions()?;
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match bs._choose_install_partition() {
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Some(p) => Ok(p.clone()),
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None => bail!("no partition found for installation"),
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}
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}
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pub fn choose_boot_partition() -> Result<Partition> {
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let bs = BootSelection::load_partitions()?;
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match bs._choose_boot_partition() {
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Some(p) => Ok(p.clone()),
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None => bail!("no partition found to boot from"),
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}
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}
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fn load_partitions() -> Result<BootSelection> {
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let partitions = Partition::rootfs_partitions()
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.map_err(|e| format_err!("Could not load rootfs partition info: {}", e))?;
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Ok(BootSelection {
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partitions
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})
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}
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fn _choose_install_partition(&self) -> Option<&Partition> {
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self.choose(|p| {
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// first pass, if there is a partition which is not mounted and
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// not initialized use that one
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!p.is_mounted() && !p.is_initialized()
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}).or_else(|| self.choose(|p| {
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// second pass, just find one that's not mounted
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!p.is_mounted()
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}))
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}
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fn choose<F>(&self, pred: F) -> Option<&Partition>
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where F: Sized + Fn(&&Partition) -> bool
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{
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self.partitions.iter().find(pred)
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}
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/// Find the best rootfs partition to boot from
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fn _choose_boot_partition(&self) -> Option<&Partition> {
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let mut best: Option<&Partition> = None;
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for p in &self.partitions {
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if is_better(&best, p) {
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best = Some(p);
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}
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}
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best
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}
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/// Perform checks for error states at boot time.
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pub fn scan_boot_partitions(&mut self) -> Result<()> {
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for mut p in &mut self.partitions {
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if let Err(e) = boot_scan_partition(&mut p) {
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warn!("error in bootscan of partition {}: {}", p.path().display(), e);
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}
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}
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Ok(())
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}
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}
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/// Called at boot to perform various checks and possibly
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/// update the status field to an error state.
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///
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/// Mark `STATUS_TRY_BOOT` partition as `STATUS_FAILED`.
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///
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/// If metainfo cannot be parsed, mark as `STATUS_BAD_META`.
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///
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/// Verify metainfo signature and mark `STATUS_BAD_SIG` if
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/// signature verification fails.
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///
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fn boot_scan_partition(p: &mut Partition) -> Result<()> {
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if !p.is_initialized() {
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return Ok(())
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}
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if p.header().status() == ImageHeader::STATUS_TRY_BOOT {
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warn!("Partition {} has STATUS_TRY_BOOT, assuming it failed boot attempt and marking STATUS_FAILED", p.path().display());
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p.write_status(ImageHeader::STATUS_FAILED)?;
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}
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p.header().verify_signature()?;
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Ok(())
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}
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fn is_better<'a>(current_best: &Option<&'a Partition>, other: &'a Partition) -> bool {
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if !other.is_initialized() {
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return false;
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}
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// Only consider partitions in state NEW or state GOOD
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if !other.is_good() && !other.is_new() {
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return false;
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}
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// If metainfo is broken, then no, it's not better
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//if !other.metainfo().is_ok() {
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// return false;
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//}
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let best = match *current_best {
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Some(p) => p,
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// No current 'best', so 'other' is better, whatever it is.
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None => return true,
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};
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// First parition with PREFER flag trumps everything else
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if best.is_preferred() {
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return false;
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}
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let best_version = best.metainfo().version();
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let other_version = other.metainfo().version();
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if best_version > other_version {
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return false;
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}
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if other_version > best_version {
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return true;
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}
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// choose NEW over GOOD if versions are the same
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if other.is_new() && best.is_good() {
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return true;
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}
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// ... but if all things otherwise match, return first match
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false
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}
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@ -10,11 +10,7 @@ use std::fs;
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use libcitadel::{Result,CommandLine,set_verbose,format_error,ResourceImage,util};
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mod boot_select;
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mod rootfs;
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pub use boot_select::BootSelection;
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use rootfs::Rootfs;
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/// mount command supports 4 subcommands
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///
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@ -27,7 +23,7 @@ use rootfs::Rootfs;
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///
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/// 'kernel' mounts a resource bundle containing kernel modules
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/// 'extra' mounts a resource bundle containing extra files
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///
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/// 'overlay' mounts a tmpfs overlay over rootfs filesystem only if citadel.overlay is set
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///
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fn main() {
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@ -54,8 +50,7 @@ fn main() {
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fn mount_rootfs() -> Result<()> {
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info!("citadel-mount rootfs");
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let rootfs = Rootfs::new();
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rootfs.setup()
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rootfs::setup_rootfs()
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}
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fn mount_kernel() -> Result<()> {
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@ -1,93 +1,174 @@
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use std::process::Command;
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use libcitadel::{BlockDev,CommandLine,Partition,Result,verity};
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use libcitadel::{BlockDev,CommandLine,ImageHeader,Partition,Result,verity};
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use std::path::Path;
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use std::process::Stdio;
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use BootSelection;
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use ResourceImage;
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pub struct Rootfs {
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}
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impl Rootfs {
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pub fn new() -> Rootfs {
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Rootfs {}
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}
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pub fn setup(&self) -> Result<()> {
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if CommandLine::install_mode() || CommandLine::live_mode() {
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self.setup_rootfs_resource()
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} else {
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let partition = BootSelection::choose_boot_partition()?;
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self.setup_partition(partition)
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}
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}
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fn setup_partition(&self, partition: Partition) -> Result<()> {
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if CommandLine::noverity() {
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self.setup_partition_unverified(&partition)
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} else {
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self.setup_partition_verified(&partition)
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}
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}
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fn setup_rootfs_resource(&self) -> Result<()> {
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info!("Searching for rootfs resource image");
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let img = ResourceImage::find_rootfs()?;
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if CommandLine::noverity() {
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self.setup_resource_unverified(&img)
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} else {
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self.setup_resource_verified(&img)
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}
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}
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fn setup_resource_unverified(&self, img: &ResourceImage) -> Result<()> {
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if img.is_compressed() {
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img.decompress()?;
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}
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let loopdev = img.create_loopdev()?;
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info!("Loop device created: {}", loopdev.display());
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self.setup_linear_mapping(&loopdev)
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}
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fn setup_resource_verified(&self, img: &ResourceImage) -> Result<()> {
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let _ = img.setup_verity_device()?;
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Ok(())
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}
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fn setup_partition_unverified(&self, partition: &Partition) -> Result<()> {
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info!("Creating /dev/mapper/rootfs device with linear device mapping of partition (no verity)");
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self.setup_linear_mapping(partition.path())
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}
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fn setup_partition_verified(&self, partition: &Partition) -> Result<()> {
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info!("Creating /dev/mapper/rootfs dm-verity device");
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if !CommandLine::nosignatures() {
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partition.header().verify_signature()?;
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info!("Image signature is valid for channel {}", partition.metainfo().channel());
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}
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verity::setup_partition_device(partition)?;
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Ok(())
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}
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fn setup_linear_mapping(&self, blockdev: &Path) -> Result<()> {
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let dev = BlockDev::open_ro(blockdev)?;
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let table = format!("0 {} linear {} 0", dev.nsectors()?, blockdev.display());
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info!("/usr/sbin/dmsetup create rootfs --table '{}'", table);
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let ok = Command::new("/usr/sbin/dmsetup")
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.args(&["create", "rootfs", "--table", &table])
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.stderr(Stdio::inherit())
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.status()
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.expect("unable to execute /usr/sbin/dmsetup")
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.success();
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if !ok {
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bail!("Failed to set up linear identity mapping with /usr/sbin/dmsetup");
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}
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Ok(())
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pub fn setup_rootfs() -> Result<()> {
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if CommandLine::install_mode() || CommandLine::live_mode() {
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setup_rootfs_resource()
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} else {
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let p = choose_boot_partiton(true)?;
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setup_partition(p)
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}
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}
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fn setup_partition(mut p: Partition) -> Result<()> {
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if CommandLine::noverity() {
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setup_partition_unverified(&p)
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} else {
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setup_partition_verified(&mut p)
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}
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}
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fn setup_rootfs_resource() -> Result<()> {
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info!("Searching for rootfs resource image");
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let img = ResourceImage::find_rootfs()?;
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if CommandLine::noverity() {
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setup_resource_unverified(&img)
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} else {
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setup_resource_verified(&img)
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}
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}
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fn setup_resource_unverified(img: &ResourceImage) -> Result<()> {
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if img.is_compressed() {
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img.decompress()?;
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}
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let loopdev = img.create_loopdev()?;
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info!("Loop device created: {}", loopdev.display());
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setup_linear_mapping(&loopdev)
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}
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fn setup_resource_verified(img: &ResourceImage) -> Result<()> {
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let _ = img.setup_verity_device()?;
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Ok(())
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}
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fn setup_partition_unverified(p: &Partition) -> Result<()> {
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info!("Creating /dev/mapper/rootfs device with linear device mapping of partition (no verity)");
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setup_linear_mapping(p.path())
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}
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fn setup_partition_verified(p: &mut Partition) -> Result<()> {
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info!("Creating /dev/mapper/rootfs dm-verity device");
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if !CommandLine::nosignatures() {
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if !p.has_public_key() {
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bail!("No public key available for channel {}", p.metainfo().channel())
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}
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if !p.is_signature_valid() {
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p.write_status(ImageHeader::STATUS_BAD_SIG)?;
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bail!("Signature verification failed on partition");
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}
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info!("Image signature is valid for channel {}", p.metainfo().channel());
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}
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verity::setup_partition_device(p)?;
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Ok(())
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}
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fn setup_linear_mapping(blockdev: &Path) -> Result<()> {
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let dev = BlockDev::open_ro(blockdev)?;
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let table = format!("0 {} linear {} 0", dev.nsectors()?, blockdev.display());
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info!("/usr/sbin/dmsetup create rootfs --table '{}'", table);
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let ok = Command::new("/usr/sbin/dmsetup")
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.args(&["create", "rootfs", "--table", &table])
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.stderr(Stdio::inherit())
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.status()
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.expect("unable to execute /usr/sbin/dmsetup")
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.success();
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if !ok {
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bail!("Failed to set up linear identity mapping with /usr/sbin/dmsetup");
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}
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Ok(())
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}
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fn choose_boot_partiton(scan: bool) -> Result<Partition> {
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let mut partitions = Partition::rootfs_partitions()?;
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if scan {
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for p in &mut partitions {
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p.boot_scan()?;
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}
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}
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let mut best = None;
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for p in partitions {
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best = compare_boot_partitions(best, p);
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}
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best.ok_or(format_err!("No partition found to boot from"))
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}
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fn compare_boot_partitions(a: Option<Partition>, b: Partition) -> Option<Partition> {
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if !is_bootable(&b) {
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return a;
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}
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// b is bootable, so if a is None, then just return b
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let a = match a {
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Some(partition) => partition,
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None => return Some(b),
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};
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// First partition with FLAG_PREFER_BOOT trumps everything
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if a.is_preferred() {
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return Some(a);
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}
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if b.is_preferred() {
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return Some(b);
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}
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// Compare versions and channels
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let a_v = a.metainfo().version();
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let b_v = b.metainfo().version();
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// Compare versions only if channels match
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if a.metainfo().channel() == b.metainfo().channel() {
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if a_v > b_v {
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return Some(a);
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} else if b_v > a_v {
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return Some(b);
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}
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}
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// choose NEW over GOOD if versions are the same or
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// if versions cannot be compared because channels differ
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if b.is_new() && a.is_good() {
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return Some(b);
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}
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Some(a)
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}
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fn is_bootable(p: &Partition) -> bool {
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if !p.is_initialized() {
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return false;
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}
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// signatures enabled so not bootable without pubkey
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if signatures_enabled() && !p.has_public_key() {
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return false;
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}
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if p.is_new() || p.is_good() {
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return true;
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}
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// If signatures are disabled then don't disqualify an
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// image which failed a prior signature verification
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if !signatures_enabled() && p.is_sig_failed() {
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return true;
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}
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false
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}
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fn signatures_enabled() -> bool {
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!(CommandLine::nosignatures() || CommandLine::noverity())
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}
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