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Scaffold workspace, sessiond client, cross-build, CI

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sessiond-client is tested against the live daemon. No compiled-in verb
vocabulary: describe returns the table and callers plan from it. Nothing
caches state the protocol owns.

wire, compositor and shell-host are placeholders pending the arm64 engine.

CI gates on the aarch64 cross-build, not a host build.
This commit is contained in:
Fimeg 2026-07-28 00:49:34 -04:00
commit c6f74d0f23
14 changed files with 1165 additions and 0 deletions
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# Cross-compilation for the phone. Nothing is ever built on the device: the
# Pixel 3 is Casey's daily driver and a build there costs him his live system.
# archdev cross-compiles everything (SouveraineOS STATE.md).
[target.aarch64-unknown-linux-gnu]
linker = "aarch64-linux-gnu-gcc"
[env]
# The Rust half must link against the same aarch64 libc the C side uses, so the
# linker is named explicitly rather than inherited from the host.
CC_aarch64_unknown_linux_gnu = "aarch64-linux-gnu-gcc"

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.gitea/workflows/ci.yml Normal file
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name: ci
on:
push:
branches: [main]
pull_request:
jobs:
check:
runs-on: archdev
steps:
- uses: actions/checkout@v4
- name: fmt
run: cargo fmt --all -- --check
- name: clippy
run: cargo clippy --workspace --all-targets -- -D warnings
- name: test
run: cargo test --workspace
# The phone is the only target that matters. A host-only green build has
# said nothing about whether this ships.
- name: cross-build aarch64
run: cargo build --workspace --target aarch64-unknown-linux-gnu

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target/
**/*.rs.bk
.DS_Store

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Cargo.toml Normal file
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[workspace]
resolver = "3"
members = [
"crates/sessiond-client",
"crates/wire",
"crates/compositor",
"crates/shell-host",
]
[workspace.package]
version = "0.1.0"
edition = "2024"
license = "AGPL-3.0-or-later"
authors = ["Fimeg"]
repository = "https://gitea.wiuf.net/Fimeg/souveraine-viewtop"
[workspace.dependencies]
# async runtime + primitives
tokio = { version = "1.52", features = ["rt-multi-thread", "macros", "sync", "time", "net", "io-util"] }
futures = "0.3"
# errors / (de)serialization
thiserror = "2"
anyhow = "1"
serde = { version = "1", features = ["derive"] }
serde_json = "1"
# tracing
tracing = "0.1"
tracing-subscriber = { version = "0.3", features = ["env-filter"] }
# in-workspace
viewtop-sessiond-client = { path = "crates/sessiond-client" }
viewtop-wire = { path = "crates/wire" }
[profile.release]
lto = "thin"
codegen-units = 1
strip = "debuginfo"

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LICENSE Normal file
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DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
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17. Interpretation of Sections 15 and 16.
If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
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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
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You should have received a copy of the GNU Affero General Public License
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Also add information on how to contact you by electronic and paper mail.
If your software can interact with users remotely through a computer
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You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU AGPL, see
<https://www.gnu.org/licenses/>.

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# souveraine-viewtop
The Souveraine compositor. Wayland session for the phone, built so the agent
can compose over the screen rather than ask a shell for permission to touch it.
Not a fork. The Flutter embedder patches it depends on are Denial's
(GPL-3.0-or-later, `denialwm/denial`) and are used as a dependency, but the
compositor, the shell policy, and the authority model are Souveraine's.
## Why it exists
Doctrine §13: *the agent owns the device more than the user does — call it
60/40.* Operation, composition, and observation are the agent's; being the
user, the credential, and the step-up are not. A verb the agent cannot reach is
a defect unless a rule says otherwise.
A compositor whose shell answers to someone else's policy cannot honour that.
Client windows have to become objects in a scene the agent can address — move,
group, reveal, hide — not opaque rectangles a window manager owns.
## Architecture
| Crate | Owns |
| --- | --- |
| `sessiond-client` | Talks to `souveraine-sessiond`. Asks; never decides. |
| `wire` | Typed protocol between the compositor and the Flutter shell. |
| `compositor` | Smithay: Wayland protocol state, input routing, DRM/KMS. |
| `shell-host` | Hosts the Flutter engine; bridges scene state both ways. |
**sessiond stays the session authority.** viewtop is a client of its verb
table. Per doctrine §4, nothing here caches state the protocol owns — no shadow
`locked` bool, no hand-rolled idle detection. The verb vocabulary is not
compiled in either: `describe` returns the table and callers plan from it, so
this does not become a second place device capabilities are enumerated.
## Building
**Never build on the phone.** The Pixel 3 is the daily driver; a build there
costs a live system. `archdev` cross-compiles everything.
```sh
cargo test --workspace
cargo clippy --workspace --all-targets -- -D warnings
cargo build --workspace --target aarch64-unknown-linux-gnu
```
The Flutter engine is built separately from the pinned Denial revisions
(Flutter `84fc5cbb`, Skia `e9ed4fc9`, Dart `d684a576`) with the ten-patch
DMSAA/external-texture series applied, retargeted to `arm64`.
## Status
Scaffold. `sessiond-client` is real and tested against the live daemon's
twelve-verb table; `wire`, `compositor`, and `shell-host` are placeholders
pending the arm64 engine build.
## Licence
AGPL-3.0-or-later.

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[package]
name = "viewtop-compositor"
version.workspace = true
edition.workspace = true
license.workspace = true
authors.workspace = true
repository.workspace = true
description = "Wayland compositor core (Smithay): protocol state, input, DRM/KMS presentation."
[dependencies]
viewtop-sessiond-client.workspace = true
viewtop-wire.workspace = true
tokio.workspace = true
anyhow.workspace = true
tracing.workspace = true

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//! Placeholder: crate scaffolded, implementation pending the arm64 engine build.

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[package]
name = "viewtop-sessiond-client"
version.workspace = true
edition.workspace = true
license.workspace = true
authors.workspace = true
repository.workspace = true
description = "Client for souveraine-sessiond's line-JSON control socket."
[dependencies]
tokio.workspace = true
serde.workspace = true
serde_json.workspace = true
thiserror.workspace = true
tracing.workspace = true
[dev-dependencies]
tokio = { workspace = true, features = ["macros", "rt"] }

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//! Client for `souveraine-sessiond`'s control socket.
//!
//! One JSON object per line over a Unix socket in the user's runtime dir. The
//! daemon is the session authority; viewtop asks and never decides. Doctrine
//! §4: never hold state the protocol owns — there is no cached `locked` bool in
//! here, and there must not be one. A shadow copy can disagree with logind, and
//! anything asking logind directly sees something different than the shell shows.
//!
//! The verb vocabulary is not compiled in. `describe` returns the table, and
//! callers plan from it — a verb missing from the table is as unreachable as one
//! that was never written (doctrine §13). Hardcoding a verb list here would make
//! this a second place device capabilities are enumerated, and it would drift
//! from the daemon within a month.
use std::path::{Path, PathBuf};
use serde::{Deserialize, Serialize};
use tokio::io::{AsyncBufReadExt, AsyncWriteExt, BufReader};
use tokio::net::UnixStream;
/// Socket path relative to `$XDG_RUNTIME_DIR`, matching sessiond's
/// `SOCKET_RELPATH`. User tier, not system tier.
pub const SOCKET_RELPATH: &str = "souveraine/sessiond.sock";
/// Why a request was refused, in a form a caller can branch on.
///
/// Mirrors sessiond's `RefusalCode`. The taxonomy is deliberately small and
/// closed: a caller can exhaust it rather than keep up with a growing list.
/// `Unknown` exists only so that a daemon newer than this client does not turn
/// an unrecognised code into a parse failure — it is not a sixth category.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
pub enum RefusalCode {
/// The op does not exist, or the line did not parse. Retrying is pointless;
/// the caller is speaking a vocabulary this daemon does not have.
UnsupportedOp,
/// The op exists and the arguments are wrong. Retrying with the same
/// arguments is pointless.
InvalidArgument,
/// Op and arguments are fine; current state forbids it. This means *not
/// now*, and the state that forbade it is worth reading before deciding
/// what to do next.
RefusedByState,
/// The caller may not do this. Nothing issues it yet — caller identity is
/// uid 1000 for everything — but branch on it now so capability tokens
/// land without a client change.
NotPermitted,
/// A dependency is absent: no compositor, no PAM stack, no sensor. Not the
/// caller's fault and possibly transient.
Unavailable,
/// A code this client does not know. Treat as terminal for the current
/// step and read `reason`.
#[serde(other)]
Unknown,
}
impl RefusalCode {
/// True when retrying the identical request could plausibly succeed later.
///
/// `RefusedByState` is the only *not now*; the rest are *not like this* or
/// *not ever*. A chain uses this to decide between waiting and re-planning.
pub fn is_transient(self) -> bool {
matches!(self, RefusalCode::RefusedByState | RefusalCode::Unavailable)
}
}
/// One entry in the verb table `describe` returns.
#[derive(Debug, Clone, Deserialize)]
pub struct VerbDoc {
/// The `op` string, exactly as it goes on the wire.
pub op: String,
/// True when the op changes something. A chain needs to know which steps
/// are reversible reads and which are not.
pub mutates: bool,
/// What it does, in one line.
pub summary: String,
/// The refusal codes this op can return, so a chain plans its branches
/// rather than discovering them by being refused.
#[serde(default)]
pub refuses: Vec<RefusalCode>,
/// A minimal request line that parses. Knowing an op exists is not enough
/// to call it.
pub example: String,
}
/// The verb table as the daemon currently reports it.
#[derive(Debug, Clone, Deserialize)]
pub struct VerbTable {
pub verbs: Vec<VerbDoc>,
}
impl VerbTable {
/// Look up a verb by op name.
pub fn get(&self, op: &str) -> Option<&VerbDoc> {
self.verbs.iter().find(|v| v.op == op)
}
/// True when the daemon advertises this op at all.
pub fn supports(&self, op: &str) -> bool {
self.get(op).is_some()
}
/// Verbs that change something — the steps a chain cannot freely retry.
pub fn mutating(&self) -> impl Iterator<Item = &VerbDoc> {
self.verbs.iter().filter(|v| v.mutates)
}
}
/// A refusal carrying both the branchable code and the prose that explains
/// *this* refusal rather than its class.
#[derive(Debug, Clone)]
pub struct Refusal {
pub code: RefusalCode,
pub reason: String,
}
#[derive(Debug, thiserror::Error)]
pub enum Error {
#[error("sessiond socket not found at {0} — is souveraine-sessiond running?")]
NotFound(PathBuf),
#[error("XDG_RUNTIME_DIR is unset; cannot locate the user-tier socket")]
NoRuntimeDir,
#[error("io: {0}")]
Io(#[from] std::io::Error),
#[error("malformed reply: {0}")]
Decode(#[from] serde_json::Error),
#[error("sessiond closed the connection without replying")]
Closed,
#[error("{} — {}", .0.code.as_wire(), .0.reason)]
Refused(Refusal),
}
impl RefusalCode {
fn as_wire(self) -> &'static str {
match self {
RefusalCode::UnsupportedOp => "unsupported_op",
RefusalCode::InvalidArgument => "invalid_argument",
RefusalCode::RefusedByState => "refused_by_state",
RefusalCode::NotPermitted => "not_permitted",
RefusalCode::Unavailable => "unavailable",
RefusalCode::Unknown => "unknown",
}
}
}
/// Raw reply shape: either an ok payload or a refusal.
#[derive(Debug, Deserialize)]
#[serde(untagged)]
enum Reply {
Refused {
#[allow(dead_code)]
ok: Option<bool>,
code: RefusalCode,
#[serde(default)]
reason: String,
},
Ok(serde_json::Value),
}
/// A connection to sessiond.
///
/// Deliberately not a long-lived pool: the socket is cheap, and holding one
/// open across a lock transition invites exactly the stale-state problem §4
/// forbids.
pub struct Sessiond {
path: PathBuf,
}
impl Sessiond {
/// Locate the socket under `$XDG_RUNTIME_DIR`.
pub fn discover() -> Result<Self, Error> {
let runtime = std::env::var_os("XDG_RUNTIME_DIR").ok_or(Error::NoRuntimeDir)?;
let path = Path::new(&runtime).join(SOCKET_RELPATH);
if !path.exists() {
return Err(Error::NotFound(path));
}
Ok(Self { path })
}
/// Use an explicit socket path (tests, or a non-default runtime dir).
pub fn at(path: impl Into<PathBuf>) -> Self {
Self { path: path.into() }
}
pub fn socket_path(&self) -> &Path {
&self.path
}
/// Send one request line, read one reply line.
///
/// Returns `Err(Error::Refused)` for a refusal so callers branch on the
/// code rather than string-matching prose.
pub async fn request(&self, req: &serde_json::Value) -> Result<serde_json::Value, Error> {
let stream = UnixStream::connect(&self.path).await.map_err(|e| {
if e.kind() == std::io::ErrorKind::NotFound {
Error::NotFound(self.path.clone())
} else {
Error::Io(e)
}
})?;
let (rx, mut tx) = stream.into_split();
let mut line = serde_json::to_vec(req)?;
line.push(b'\n');
tx.write_all(&line).await?;
tx.flush().await?;
let mut reader = BufReader::new(rx);
let mut buf = String::new();
if reader.read_line(&mut buf).await? == 0 {
return Err(Error::Closed);
}
match serde_json::from_str::<Reply>(buf.trim_end())? {
Reply::Refused { code, reason, .. } => Err(Error::Refused(Refusal { code, reason })),
Reply::Ok(v) => Ok(v),
}
}
/// Call an op with no arguments beyond its name.
pub async fn call(&self, op: &str) -> Result<serde_json::Value, Error> {
self.request(&serde_json::json!({ "op": op })).await
}
/// The verb table. Ask this before planning anything — it is the only
/// honest answer to "what may I do", and it is why nothing else in this
/// crate hardcodes an op list.
pub async fn describe(&self) -> Result<VerbTable, Error> {
let v = self.call("describe").await?;
Ok(serde_json::from_value(v)?)
}
/// Liveness and who currently owns the session lock.
pub async fn status(&self) -> Result<serde_json::Value, Error> {
self.call("status").await
}
/// The unified device state. Read it; never mirror it.
pub async fn device_state(&self) -> Result<serde_json::Value, Error> {
self.call("device_state").await
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn refusal_codes_round_trip_from_wire() {
for (wire, want) in [
("unsupported_op", RefusalCode::UnsupportedOp),
("invalid_argument", RefusalCode::InvalidArgument),
("refused_by_state", RefusalCode::RefusedByState),
("not_permitted", RefusalCode::NotPermitted),
("unavailable", RefusalCode::Unavailable),
] {
let got: RefusalCode = serde_json::from_str(&format!("\"{wire}\"")).unwrap();
assert_eq!(got, want, "{wire}");
assert_eq!(got.as_wire(), wire);
}
}
#[test]
fn unknown_code_does_not_fail_the_parse() {
// A daemon newer than this client must not break it.
let got: RefusalCode = serde_json::from_str("\"some_future_code\"").unwrap();
assert_eq!(got, RefusalCode::Unknown);
}
#[test]
fn only_state_and_availability_are_worth_retrying() {
assert!(RefusalCode::RefusedByState.is_transient());
assert!(RefusalCode::Unavailable.is_transient());
assert!(!RefusalCode::UnsupportedOp.is_transient());
assert!(!RefusalCode::InvalidArgument.is_transient());
assert!(!RefusalCode::NotPermitted.is_transient());
}
#[test]
fn refusal_reply_parses_as_refusal_not_payload() {
let raw = r#"{"ok":false,"code":"refused_by_state","reason":"a live shell owns the session lock"}"#;
match serde_json::from_str::<Reply>(raw).unwrap() {
Reply::Refused { code, reason, .. } => {
assert_eq!(code, RefusalCode::RefusedByState);
assert!(reason.contains("live shell"));
}
Reply::Ok(v) => panic!("refusal parsed as payload: {v}"),
}
}
#[test]
fn verb_table_answers_support_questions() {
let raw = r#"{"verbs":[
{"op":"describe","mutates":false,"summary":"the table","refuses":[],"example":"{\"op\":\"describe\"}"},
{"op":"lock","mutates":true,"summary":"lock the session","refuses":["refused_by_state","unavailable"],"example":"{\"op\":\"lock\"}"}
]}"#;
let t: VerbTable = serde_json::from_str(raw).unwrap();
assert!(t.supports("lock"));
assert!(!t.supports("teleport"));
assert_eq!(t.mutating().count(), 1);
assert_eq!(t.get("lock").unwrap().refuses.len(), 2);
}
}

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[package]
name = "viewtop-shell-host"
version.workspace = true
edition.workspace = true
license.workspace = true
authors.workspace = true
repository.workspace = true
description = "Hosts the Flutter shell engine and bridges it to compositor scene state."
[dependencies]
viewtop-wire.workspace = true
viewtop-sessiond-client.workspace = true
tokio.workspace = true
anyhow.workspace = true
tracing.workspace = true

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//! Placeholder: crate scaffolded, implementation pending the arm64 engine build.

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[package]
name = "viewtop-wire"
version.workspace = true
edition.workspace = true
license.workspace = true
authors.workspace = true
repository.workspace = true
description = "Typed wire protocol between the viewtop compositor and its Flutter shell."
[dependencies]
serde.workspace = true
serde_json.workspace = true
thiserror.workspace = true

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//! Placeholder: crate scaffolded, implementation pending the arm64 engine build.