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// Copyright (C) 2026 Doan Luu Duc Tai <doan@luuduct.ai>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
use std::collections::BTreeMap;
use std::fs::{self, File};
use std::path::Path;
use anyhow::{Context, Result, ensure};
use serde::{Deserialize, Serialize};
use serde_json::Value;
use crate::project::{Mode, Project, Settings, field};
use crate::{files, process};
#[derive(Debug, Deserialize, Serialize)]
#[serde(deny_unknown_fields)]
struct Image {
reference: String,
architecture: String,
layers: Value,
id: String,
}
#[derive(Debug, Deserialize, Serialize)]
#[serde(deny_unknown_fields)]
struct ImageLock {
format: u32,
platform: String,
services: BTreeMap<String, Image>,
}
fn inspect(project: &Project, name: &str) -> Result<Value> {
let records: Vec<Value> = serde_json::from_slice(
&process::capture(project.command("podman")?.args(["image", "inspect", name]))?.stdout,
)?;
records
.into_iter()
.next()
.context("Docker returned no image")
}
pub(crate) fn save(project: &Project, containers: &[Value], destination: &Path) -> Result<()> {
fs::create_dir_all(destination)?;
let platform = project.platform()?;
let mut services = BTreeMap::new();
let mut new_tags = Vec::new();
let result = save_inner(
project,
containers,
destination,
&mut services,
&mut new_tags,
);
for tag in new_tags {
if let Err(error) = process::capture(project.command("podman")?.args(["image", "rm", &tag]))
{
process::error(format_args!(
"Could not remove temporary image tag {tag}: {error:#}"
))?;
}
}
result?;
let lock = ImageLock {
format: 2,
platform,
services,
};
files::write(
&destination.join("image-lock.json"),
&serde_json::to_vec_pretty(&lock)?,
0o600,
)
}
fn save_inner(
project: &Project,
containers: &[Value],
destination: &Path,
services: &mut BTreeMap<String, Image>,
new_tags: &mut Vec<String>,
) -> Result<()> {
for container in containers {
let service = field(container, &["Config", "Labels", "io.stack.service"])?
.as_str()
.context("Missing service label")?;
let id = field(container, &["Image"])?
.as_str()
.context("Missing image ID")?;
let suffix: String = id.trim_start_matches("sha256:").chars().take(16).collect();
let alias = format!("localhost/stack-export-{service}:{suffix}");
if !process::available(
project
.command("podman")?
.args(["image", "inspect", &alias]),
) {
process::capture(
project
.command("podman")?
.args(["image", "tag", id, &alias]),
)?;
new_tags.push(alias.clone());
}
let actual = inspect(project, &alias)?;
services.insert(
service.to_owned(),
Image {
reference: alias,
architecture: field(&actual, &["Architecture"])?
.as_str()
.context("Missing architecture")?
.to_owned(),
layers: field(&actual, &["RootFS", "Layers"])?.clone(),
id: field(&actual, &["Id"])?
.as_str()
.context("Missing image ID")?
.trim_start_matches("sha256:")
.to_owned(),
},
);
}
let mut command = project.command("podman")?;
command
.args([
"save",
"--multi-image-archive",
"--format",
"docker-archive",
"--output",
])
.arg(destination.join("images.tar"));
for image in services.values() {
command.arg(&image.reference);
}
process::run(&mut command)
}
pub(crate) fn prepare(project: &Project, settings: &mut Settings) -> Result<()> {
let path = project.root.join("var/image-lock.json");
if settings.online || !path.is_file() {
return Ok(());
}
let lock: ImageLock = serde_json::from_reader(File::open(path)?)?;
ensure!(lock.format == 2, "Unsupported image lock format");
let platform = project.platform()?;
if platform.trim() != lock.platform {
ensure!(
settings.mode == Mode::Local,
"Release images target {}, but this server is {}; build a native release locally",
lock.platform,
platform.trim()
);
settings.online = true;
return process::line(format_args!(
"Using native images/builds for {}",
platform.trim()
));
}
let missing = lock.services.values().any(|item| {
project.command("podman").is_ok_and(|mut command| {
!process::available(command.args(["image", "inspect", &item.reference]))
})
});
if missing {
let archive = project.root.join("var/images.tar");
ensure!(
archive.is_file(),
"Release image archive is missing; deploy a complete release"
);
process::run(
project
.command("podman")?
.args(["image", "load", "--input"])
.arg(archive),
)?;
}
for (service, image) in lock.services {
let actual = inspect(project, &image.reference)?;
ensure!(
field(&actual, &["Architecture"])?.as_str() == Some(image.architecture.as_str())
&& field(&actual, &["RootFS", "Layers"])? == &image.layers
&& field(&actual, &["Id"])?
.as_str()
.context("Missing image ID")?
.trim_start_matches("sha256:")
== image.id,
"Loaded image does not match its content lock: {service}"
);
}
Ok(())
}
pub(crate) fn configured(project: &Project, settings: &Settings) -> Result<Vec<Value>> {
let config = project.configuration(settings)?;
let mut records = Vec::new();
for (service, value) in config.services {
let actual = inspect(project, &value.image)?;
records.push(serde_json::json!({
"Image": field(&actual, &["Id"])?,
"Config": {"Labels": {"io.stack.service": service}}
}));
}
Ok(records)
}
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