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Add a rollback verb and rollbackQueued status
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I'd really hoped to do something more declarative here, and
really flesh out the intersections with automated upgrades
and automated rollbacks.

But, this just exposes the simple primitive, equivalent
to `rpm-ostree rollback`.

Signed-off-by: Colin Walters <[email protected]>
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cgwalters committed Mar 26, 2024
1 parent fd94c6f commit 32348a5
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Showing 5 changed files with 84 additions and 3 deletions.
25 changes: 25 additions & 0 deletions lib/src/cli.rs
Original file line number Diff line number Diff line change
Expand Up @@ -89,6 +89,10 @@ pub(crate) struct SwitchOpts {
pub(crate) target: String,
}

/// Options controlling rollback
#[derive(Debug, Parser, PartialEq, Eq)]
pub(crate) struct RollbackOpts {}

/// Perform an edit operation
#[derive(Debug, Parser, PartialEq, Eq)]
pub(crate) struct EditOpts {
Expand Down Expand Up @@ -214,6 +218,18 @@ pub(crate) enum Opt {
/// This operates in a very similar fashion to `upgrade`, but changes the container image reference
/// instead.
Switch(SwitchOpts),
/// Change the bootloader entry ordering; the deployment under `rollback` will be queued for the next boot,
/// and the current will become rollback. If there is a `staged` entry (an unapplied, queued upgrade)
/// then it will be discarded.
///
/// Note that absent any additional control logic, if there is an active agent doing automated upgrades
/// (such as the default `bootc-fetch-apply-updates.timer` and associated `.service`) the
/// change here may be reverted. It's recommended to only use this in concert with an agent that
/// is in active control.
///
/// A systemd journal message will be logged with `MESSAGE_ID=26f3b1eb24464d12aa5e7b544a6b5468` in
/// order to detect a rollback invocation.
Rollback(RollbackOpts),
/// Apply full changes to the host specification.
///
/// This command operates very similarly to `kubectl apply`; if invoked interactively,
Expand Down Expand Up @@ -500,6 +516,14 @@ async fn switch(opts: SwitchOpts) -> Result<()> {
Ok(())
}

/// Implementation of the `bootc rollback` CLI command.
#[context("Rollback")]
async fn rollback(_opts: RollbackOpts) -> Result<()> {
prepare_for_write().await?;
let sysroot = &get_locked_sysroot().await?;
crate::deploy::rollback(sysroot).await
}

/// Implementation of the `bootc edit` CLI command.
#[context("Editing spec")]
async fn edit(opts: EditOpts) -> Result<()> {
Expand Down Expand Up @@ -586,6 +610,7 @@ async fn run_from_opt(opt: Opt) -> Result<()> {
match opt {
Opt::Upgrade(opts) => upgrade(opts).await,
Opt::Switch(opts) => switch(opts).await,
Opt::Rollback(opts) => rollback(opts).await,
Opt::Edit(opts) => edit(opts).await,
Opt::UsrOverlay => usroverlay().await,
#[cfg(feature = "install")]
Expand Down
49 changes: 48 additions & 1 deletion lib/src/deploy.rs
Original file line number Diff line number Diff line change
Expand Up @@ -5,7 +5,7 @@
use std::io::{BufRead, Write};

use anyhow::Ok;
use anyhow::{Context, Result};
use anyhow::{anyhow, Context, Result};

use cap_std::fs::{Dir, MetadataExt};
use cap_std_ext::cap_std;
Expand Down Expand Up @@ -276,6 +276,53 @@ pub(crate) async fn stage(
Ok(())
}

/// Implementation of rollback functionality
pub(crate) async fn rollback(sysroot: &SysrootLock) -> Result<()> {
const ROLLBACK_JOURNAL_ID: &str = "26f3b1eb24464d12aa5e7b544a6b5468";
let repo = &sysroot.repo();
let (booted_deployment, deployments, host) = crate::status::get_status_require_booted(sysroot)?;
let reverting = host.status.rollback_queued;
if reverting {
println!("notice: Reverting queued rollback state");
}
let rollback_status = host
.status
.rollback
.ok_or_else(|| anyhow!("No rollback available"))?;
let rollback_image = rollback_status
.query_image(repo)?
.ok_or_else(|| anyhow!("Rollback is not container image based"))?;
let msg = format!("Rolling back to image: {}", rollback_image.manifest_digest);
libsystemd::logging::journal_send(
libsystemd::logging::Priority::Info,
&msg,
[
("MESSAGE_ID", ROLLBACK_JOURNAL_ID),
("BOOTC_MANIFEST_DIGEST", &rollback_image.manifest_digest),
]
.into_iter(),
)?;
// SAFETY: If there's a rollback status, then there's a deployment
let rollback_deployment = deployments.rollback.expect("rollback deployment");
let new_deployments = if reverting {
[booted_deployment, rollback_deployment]
} else {
[rollback_deployment, booted_deployment]
};
let new_deployments = new_deployments
.into_iter()
.chain(deployments.other)
.collect::<Vec<_>>();
tracing::debug!("Writing new deployments: {new_deployments:?}");
sysroot.write_deployments(&new_deployments, gio::Cancellable::NONE)?;
if reverting {
println!("Next boot: current deployment");
} else {
println!("Next boot: rollback deployment");
}
Ok(())
}

fn find_newest_deployment_name(deploysdir: &Dir) -> Result<String> {
let mut dirs = Vec::new();
for ent in deploysdir.entries()? {
Expand Down
2 changes: 2 additions & 0 deletions lib/src/spec.rs
Original file line number Diff line number Diff line change
Expand Up @@ -121,6 +121,8 @@ pub struct HostStatus {
pub booted: Option<BootEntry>,
/// The previously booted image
pub rollback: Option<BootEntry>,
/// Set to true if the rollback entry is queued for the next boot.
pub rollback_queued: bool,

/// The detected type of system
#[serde(rename = "type")]
Expand Down
7 changes: 7 additions & 0 deletions lib/src/status.rs
Original file line number Diff line number Diff line change
Expand Up @@ -224,11 +224,17 @@ pub(crate) fn get_status(
.iter()
.position(|d| d.is_staged())
.map(|i| related_deployments.remove(i).unwrap());
tracing::debug!("Staged: {staged:?}");
// Filter out the booted, the caller already found that
if let Some(booted) = booted_deployment.as_ref() {
related_deployments.retain(|f| !f.equal(booted));
}
let rollback = related_deployments.pop_front();
let rollback_queued = match (booted_deployment.as_ref(), rollback.as_ref()) {
(Some(booted), Some(rollback)) => rollback.index() < booted.index(),
_ => false,
};
tracing::debug!("Rollback queued={rollback_queued:?}");
let other = {
related_deployments.extend(other_deployments);
related_deployments
Expand Down Expand Up @@ -281,6 +287,7 @@ pub(crate) fn get_status(
staged,
booted,
rollback,
rollback_queued,
ty,
};
Ok((deployments, host))
Expand Down
4 changes: 2 additions & 2 deletions tests/integration/playbooks/rollback.yaml
Original file line number Diff line number Diff line change
Expand Up @@ -6,8 +6,8 @@
failed_counter: "0"

tasks:
- name: rpm-ostree rollback
command: rpm-ostree rollback
- name: bootc rollback
command: bootc rollback
become: true

- name: Reboot to deploy new system
Expand Down

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