workspace: add bread-app crate and first-cut bread-polkit agent
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bread-app is the GTK bootstrap new tools should use instead of another
copied main.rs: com.breadway.* app id, singleton lock, optional
gtk_popup re-export, optional bread.command.<app>.** listen loop.
Tests cover app-id helpers and command-verb parse. Existing apps are
not migrated.

bread-polkit is an own PolicyKit1 session authentication agent with a
bread-theme GTK4 password prompt (not a polkit-gnome wrapper).
Autostart via contrib/bread-polkit.desktop or exec-once. Not a bakery
product; not added to the BOS ISO lockfile.
This commit is contained in:
Breadway 2026-08-16 00:34:12 +08:00
parent c296d26408
commit 11c0e844e5
19 changed files with 2049 additions and 32 deletions

View file

@ -3,10 +3,13 @@
This repo is a Cargo workspace. Bakery-channel products shipped from here
are `bakery` (the ecosystem package manager) and `bread-theme` (the shared
theming crate). Shared crates that sibling apps pin — not bakery packages
of their own — are `bread-utils`, `bread-onnx`, `bread-screenshots`, and
`bread-capture`. Other ecosystem products (`bread`, `breadbar`, `breadbox`,
…) live in their own repos under `Breadway/` but follow the same workflow
described here. The product list is `registry/bread-ecosystem.toml`.
of their own — are `bread-utils`, `bread-app`, `bread-onnx`,
`bread-screenshots`, and `bread-capture`. `bread-polkit` is an in-tree
session agent, also not a bakery product. Other ecosystem products
(`bread`, `breadbar`, `breadbox`, …) live in their own repos under
`Breadway/` but follow the same workflow described here. The product list
is `registry/bread-ecosystem.toml`. New GTK tools should depend on
`bread-app` instead of copying another app's bootstrap.
## Branches
@ -88,10 +91,12 @@ cargo build --release -p bakery
cargo test --release -p bakery
```
`bakery`, `bread-theme`, `bread-utils`, `bread-onnx`, `bread-screenshots`,
and `bread-capture` are all workspace members. Run the same commands with
`-p bread-theme --bin bread-theme` for that crate, or `-p bread-utils
--features bread-client` for the IPC client.
`bakery`, `bread-theme`, `bread-utils`, `bread-app`, `bread-polkit`,
`bread-onnx`, `bread-screenshots`, and `bread-capture` are all workspace
members. Run the same commands with `-p bread-theme --bin bread-theme`
for that crate, `-p bread-utils --features bread-client` for the IPC
client, or `-p bread-app --features bread-client` for the GTK bootstrap
helpers.
## CI

439
Cargo.lock generated
View file

@ -96,6 +96,40 @@ version = "1.0.103"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "2a4385e2e34eb35d6b3efe798b9eb88096925d87726c0798709bf56d9ed84af3"
[[package]]
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"futures-core",
"pin-project-lite",
]
[[package]]
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]
[[package]]
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]
[[package]]
name = "autocfg"
version = "1.5.1"
@ -151,6 +185,13 @@ dependencies = [
"generic-array",
]
[[package]]
name = "bread-app"
version = "0.7.2"
dependencies = [
"bread-utils",
]
[[package]]
name = "bread-capture"
version = "0.7.2"
@ -176,6 +217,21 @@ dependencies = [
"ureq",
]
[[package]]
name = "bread-polkit"
version = "0.7.2"
dependencies = [
"anyhow",
"bread-app",
"bread-theme",
"gtk4",
"serde",
"tokio",
"tracing",
"tracing-subscriber",
"zbus",
]
[[package]]
name = "bread-screenshots"
version = "0.7.2"
@ -239,6 +295,12 @@ version = "0.1.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
name = "cairo-rs"
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@ -350,7 +412,7 @@ dependencies = [
"heck",
"proc-macro2",
"quote",
"syn",
"syn 2.0.119",
]
[[package]]
@ -478,7 +540,7 @@ dependencies = [
"proc-macro2",
"quote",
"strsim",
"syn",
"syn 2.0.119",
]
[[package]]
@ -489,7 +551,7 @@ checksum = "fc34b93ccb385b40dc71c6fceac4b2ad23662c7eeb248cf10d529b7e055b6ead"
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"darling_core",
"quote",
"syn",
"syn 2.0.119",
]
[[package]]
@ -519,7 +581,7 @@ dependencies = [
"darling",
"proc-macro2",
"quote",
"syn",
"syn 2.0.119",
]
[[package]]
@ -529,7 +591,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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[[package]]
@ -586,6 +648,33 @@ version = "1.0.0"
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[[package]]
name = "endi"
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[[package]]
name = "enumflags2"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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"serde",
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[[package]]
name = "enumflags2_derive"
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[[package]]
name = "equivalent"
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@ -611,6 +700,26 @@ dependencies = [
"cc",
]
[[package]]
name = "event-listener"
version = "5.4.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
"parking",
"pin-project-lite",
]
[[package]]
name = "event-listener-strategy"
version = "0.5.4"
source = "registry+https://github.com/rust-lang/crates.io-index"
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"event-listener",
"pin-project-lite",
]
[[package]]
name = "fastrand"
version = "2.4.1"
@ -709,6 +818,19 @@ version = "0.3.33"
source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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"futures-core",
"futures-io",
"parking",
"pin-project-lite",
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[[package]]
name = "futures-macro"
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@ -717,7 +839,7 @@ checksum = "2d6d3cde68c518367be28956066ddfef33813991b77a55005a69dae04bf3b10b"
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@ -921,7 +1043,7 @@ dependencies = [
"heck",
"proc-macro2",
"quote",
"syn",
"syn 2.0.119",
]
[[package]]
@ -1055,7 +1177,7 @@ dependencies = [
"proc-macro-crate",
"proc-macro2",
"quote",
"syn",
"syn 2.0.119",
]
[[package]]
@ -1302,6 +1424,12 @@ version = "3.1.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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[[package]]
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@ -1397,6 +1525,15 @@ version = "0.2.2"
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[[package]]
name = "matrixmultiply"
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@ -1444,6 +1581,17 @@ dependencies = [
"simd-adler32",
]
[[package]]
name = "mio"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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"wasi",
"windows-sys 0.61.2",
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@ -1463,7 +1611,7 @@ checksum = "e4db6d5580af57bf992f59068d4ea26fd518574ff48d7639b255a36f9de6e7e9"
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@ -1568,6 +1716,16 @@ version = "0.2.0"
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[[package]]
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@ -1610,6 +1768,12 @@ dependencies = [
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[[package]]
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@ -1976,6 +2140,17 @@ dependencies = [
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@ -2005,12 +2180,31 @@ dependencies = [
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[[package]]
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@ -2029,6 +2223,16 @@ version = "1.15.2"
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@ -2076,6 +2280,17 @@ dependencies = [
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@ -2314,7 +2566,7 @@ checksum = "7490cfa5ec963746568740651ac6781f701c9c5ea257c58e057f3ba8cf69e8da"
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@ -2540,7 +2829,7 @@ checksum = "053e2e040ab57b9dc951b72c264860db7eb3b0200ba345b4e4c3b14f67855ddf"
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@ -2781,10 +3070,75 @@ checksum = "de844c262c8848816172cef550288e7dc6c7b7814b4ee56b3e1553f275f1858e"
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"zvariant",
]
[[package]]
name = "zcheapstr"
version = "1.1.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "d1afec51604565183aeb5c54c20aeab286120d4e4460f7f76e3e8bb8c0d99473"
dependencies = [
"serde",
]
[[package]]
name = "zerocopy"
version = "0.8.54"
@ -2802,7 +3156,7 @@ checksum = "e2e817b7b52d0c7358d3246da9d69935ebb18116b2b102b4230dac079b4862f5"
dependencies = [
"proc-macro2",
"quote",
"syn",
"syn 2.0.119",
]
[[package]]
@ -2822,7 +3176,7 @@ checksum = "11532158c46691caf0f2593ea8358fed6bbf68a0315e80aae9bd41fbade684a1"
dependencies = [
"proc-macro2",
"quote",
"syn",
"syn 2.0.119",
"synstructure",
]
@ -2862,7 +3216,7 @@ checksum = "625dc425cab0dca6dc3c3319506e6593dcb08a9f387ea3b284dbd52a92c40555"
dependencies = [
"proc-macro2",
"quote",
"syn",
"syn 2.0.119",
]
[[package]]
@ -2870,3 +3224,44 @@ name = "zmij"
version = "1.0.23"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "29666d0abbfad1e3dc4dcf6144730dd3a3ab225bbbdac83319345b1b44ccfc1b"
[[package]]
name = "zvariant"
version = "5.14.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "b5e28c25bd8bb8da5a1f3e7065d0c156b9ee9a7973adf78b0e35eaefdf3b1b5c"
dependencies = [
"endi",
"enumflags2",
"serde",
"winnow 1.0.4",
"zcheapstr",
"zvariant_derive",
"zvariant_utils",
]
[[package]]
name = "zvariant_derive"
version = "5.14.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "d496a145685283b67e232bd9e47377f6b60ad9d51e3601b23867f77c42477f96"
dependencies = [
"proc-macro-crate",
"proc-macro2",
"quote",
"syn 3.0.3",
"zvariant_utils",
]
[[package]]
name = "zvariant_utils"
version = "4.0.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "629d80ece222cad20fe0e8741be493c4ab166acf3b85341bdc2cdbcfd8f3c2d6"
dependencies = [
"proc-macro2",
"quote",
"serde",
"syn 3.0.3",
"winnow 1.0.4",
]

View file

@ -1,5 +1,5 @@
[workspace]
members = ["bakery", "bread-theme", "bread-utils", "bread-onnx", "bread-screenshots", "bread-capture"]
members = ["bakery", "bread-theme", "bread-utils", "bread-onnx", "bread-screenshots", "bread-capture", "bread-app", "bread-polkit"]
resolver = "2"
[workspace.package]

View file

@ -145,13 +145,15 @@ Install all required deps with `sudo pacman -S <packages>`. Use `pacman -Q <pkg>
This repo is a Cargo workspace. Bakery-channel products shipped from here
are `bakery` and `bread-theme`; the other members are shared crates sibling
apps pin, not bakery packages of their own.
apps pin, or in-tree tools that are not bakery packages of their own.
```
bread-ecosystem/
├── bakery/ # package manager binary
├── bread-theme/ # shared pywal + fixed-dark-base theming crate
├── bread-utils/ # shared plumbing (Hyprland IPC, singleton, XDG, BreadClient, …)
├── bread-app/ # GTK bootstrap new tools should use (app id, singleton, overlay, command listen)
├── bread-polkit/ # themed PolicyKit authentication agent (not a bakery product)
├── bread-onnx/ # shared ONNX runtime helpers
├── bread-screenshots/ # grim capture primitive used by app `--screenshot` modes
├── bread-capture/ # orchestrator that drives those `--screenshot` modes
@ -162,6 +164,39 @@ bread-ecosystem/
└── gen-readme-products.sh # rewrites the Products table from the registry
```
### New GTK tools
Do not copy another app's `main.rs`. Depend on `bread-app`:
- `bread_app::application_id` / `try_acquire` / `toggle_or_kill` for the
`com.breadway.*` application id and single-instance lock
- feature `gtk` re-exports `bread_utils::gtk_popup` (layer-shell overlay)
- feature `bread-client` for `listen_commands` on `bread.command.<app>.**`
See the `bread-app` crate docs. Existing apps are not migrated in this
tree; `bread-polkit` is the first in-tree consumer.
### bread-polkit
A session PolicyKit authentication agent (password prompt, cancel,
identity). Not a wrapper around `polkit-gnome`. Not published via bakery
and not on the BOS ISO lockfile.
```sh
cargo run -p bread-polkit
```
Autostart — pick one:
```sh
cp bread-polkit/contrib/bread-polkit.desktop ~/.config/autostart/
```
```
# hyprland.conf
exec-once = bread-polkit
```
## Release pipeline
Each product repo (`Breadway/bread`, `Breadway/breadbar`, …) has

20
bread-app/Cargo.toml Normal file
View file

@ -0,0 +1,20 @@
[package]
name = "bread-app"
version.workspace = true
edition.workspace = true
license.workspace = true
authors.workspace = true
description = "GTK application bootstrap for bread desktop tools: app id, singleton, optional overlay popup, and command listen loop"
repository = "https://git.breadway.dev/Breadway/bread-ecosystem"
keywords = ["gtk4", "wayland", "hyprland"]
[dependencies]
bread-utils = { path = "../bread-utils" }
[features]
# Layer-shell overlay helper (`gtk_popup`). Matches `bread-utils/gtk` so a
# consumer that only wants app-id / singleton helpers does not pull GTK4.
gtk = ["bread-utils/gtk"]
# `BreadClient` listen loop on `bread.command.<app>.**`. Matches
# `bread-utils/bread-client`.
bread-client = ["bread-utils/bread-client"]

121
bread-app/src/command.rs Normal file
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@ -0,0 +1,121 @@
//! Command-bus helpers for `bread.command.<app>.**`.
//!
//! The `command_id` here is the breadd sibling-app id (`clip`, `box`,
//! `shot`) — often shorter than the GTK / singleton name (`breadclip`).
use crate::id::{parse_app_name, InvalidAppId};
use bread_utils::bread_client::{BreadClient, BreadEvent, Subscription};
/// Same charset as [`parse_app_name`]: a single command-bus segment.
pub fn parse_command_id(command_id: &str) -> Result<&str, InvalidAppId> {
parse_app_name(command_id)
}
/// Subscribe glob: `bread.command.<app>.**`.
pub fn command_pattern(command_id: &str) -> Result<String, InvalidAppId> {
let id = parse_command_id(command_id)?;
Ok(format!("bread.command.{id}.**"))
}
/// The verb segment of `bread.command.<app>.<verb>` (and extra trailing
/// segments, if any). `None` when the event is not addressed to
/// `command_id` or the verb is missing.
///
/// Extra dotted remainder (`bread.command.clip.stack.clear`) yields the
/// first remaining segment (`stack`) — a verb is one segment, matching
/// [`BreadClient::command`].
pub fn command_verb<'a>(event: &'a str, command_id: &str) -> Option<&'a str> {
if command_id.is_empty() {
return None;
}
let prefix = format!("bread.command.{command_id}.");
let rest = event.strip_prefix(&prefix)?;
let verb = rest.split('.').next()?;
if verb.is_empty() {
None
} else {
Some(verb)
}
}
/// Subscribe to `bread.command.<command_id>.**` and invoke `on_verb` with
/// the parsed verb plus the raw event.
///
/// Fail-silent: constructing the client and holding the subscription never
/// requires breadd to be running. Drop the returned [`Subscription`] (or
/// call [`Subscription::stop`]) to end the loop.
pub fn listen_commands<F>(command_id: &str, on_verb: F) -> Result<Subscription, InvalidAppId>
where
F: Fn(&str, BreadEvent) + Send + 'static,
{
let id = parse_command_id(command_id)?.to_string();
let client = BreadClient::connect(id.clone());
let pattern = format!("bread.command.{id}.**");
Ok(client.subscribe(pattern, move |event| {
let Some(verb) = command_verb(&event.event, &id).map(str::to_owned) else {
return;
};
on_verb(&verb, event);
}))
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn command_pattern_uses_double_star() {
assert_eq!(command_pattern("clip").unwrap(), "bread.command.clip.**");
assert_eq!(command_pattern("shot").unwrap(), "bread.command.shot.**");
}
#[test]
fn command_pattern_rejects_invalid_id() {
assert!(command_pattern("").is_err());
assert!(command_pattern("clip.clear").is_err());
}
#[test]
fn command_verb_strips_app_prefix() {
assert_eq!(
command_verb("bread.command.clip.clear", "clip"),
Some("clear")
);
assert_eq!(
command_verb("bread.command.shot.region", "shot"),
Some("region")
);
assert_eq!(
command_verb("bread.command.shot.annotate", "shot"),
Some("annotate")
);
}
#[test]
fn command_verb_takes_first_segment_only() {
assert_eq!(
command_verb("bread.command.clip.stack.clear", "clip"),
Some("stack")
);
}
#[test]
fn command_verb_rejects_other_apps_and_missing_verb() {
assert_eq!(command_verb("bread.command.clip.clear", "shot"), None);
assert_eq!(command_verb("bread.command.clip", "clip"), None);
assert_eq!(command_verb("bread.command.clip.", "clip"), None);
assert_eq!(command_verb("bread.clip.copied", "clip"), None);
assert_eq!(command_verb("bread.command.clip.clear", ""), None);
}
#[test]
fn listen_commands_rejects_invalid_id() {
assert!(listen_commands("", |_, _| {}).is_err());
}
#[test]
fn listen_commands_stop_joins_without_a_daemon() {
let sub = listen_commands("clip", |_, _| {}).unwrap();
sub.stop();
}
}

145
bread-app/src/id.rs Normal file
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@ -0,0 +1,145 @@
//! App-id helpers shared by GTK tools and the singleton lock.
//!
//! The process / pid-file name (`breadbox`, `bread-polkit`) is also the
//! last segment of the GApplication id (`com.breadway.breadbox`). That is
//! *not* always the breadd command-bus id (`box`, `clip`) — see
//! [`crate::command_verb`] under feature `bread-client`.
use std::io;
use crate::singleton::{self, Acquire, Toggle};
/// Why [`parse_app_name`] / [`application_id`] rejected a string.
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct InvalidAppId {
/// The rejected input, owned so the error is `'static`.
pub name: String,
/// Short reason suitable for an `io::Error` / clap message.
pub reason: &'static str,
}
impl std::fmt::Display for InvalidAppId {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "invalid app id '{}': {}", self.name, self.reason)
}
}
impl std::error::Error for InvalidAppId {}
/// Accept a process / GTK application name (`breadbox`, `bread-polkit`).
///
/// Rules match a GApplication id *element*: non-empty, ASCII letter first,
/// then ASCII alphanumeric / `-` / `_`. Dots are rejected so the name can
/// sit in `com.breadway.<name>` without creating extra segments.
pub fn parse_app_name(name: &str) -> Result<&str, InvalidAppId> {
if name.is_empty() {
return Err(InvalidAppId {
name: name.to_string(),
reason: "must not be empty",
});
}
let mut chars = name.chars();
let first = chars.next().expect("non-empty");
if !first.is_ascii_alphabetic() {
return Err(InvalidAppId {
name: name.to_string(),
reason: "must start with an ASCII letter",
});
}
if !chars.all(|c| c.is_ascii_alphanumeric() || c == '-' || c == '_') {
return Err(InvalidAppId {
name: name.to_string(),
reason: "only ASCII letters, digits, '-' and '_' are allowed",
});
}
Ok(name)
}
/// Reverse-DNS GApplication id: `com.breadway.<name>`.
pub fn application_id(app_name: &str) -> Result<String, InvalidAppId> {
let name = parse_app_name(app_name)?;
Ok(format!("com.breadway.{name}"))
}
/// [`singleton::try_acquire`] after [`parse_app_name`].
///
/// Invalid names become [`io::ErrorKind::InvalidInput`] and never touch
/// the pid file.
pub fn try_acquire(app_name: &str) -> io::Result<Acquire> {
let name =
parse_app_name(app_name).map_err(|e| io::Error::new(io::ErrorKind::InvalidInput, e))?;
singleton::try_acquire(name)
}
/// [`singleton::toggle_or_kill`] after [`parse_app_name`].
pub fn toggle_or_kill(app_name: &str) -> io::Result<Toggle> {
let name =
parse_app_name(app_name).map_err(|e| io::Error::new(io::ErrorKind::InvalidInput, e))?;
singleton::toggle_or_kill(name)
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn parse_app_name_accepts_existing_tool_names() {
for name in ["breadbox", "breadclip", "bread-polkit", "breadcast"] {
assert_eq!(parse_app_name(name), Ok(name));
}
}
#[test]
fn parse_app_name_rejects_empty_dot_and_leading_digit() {
assert!(parse_app_name("").is_err());
assert!(parse_app_name("bread.box").is_err());
assert!(parse_app_name("1box").is_err());
assert!(parse_app_name("-box").is_err());
assert!(parse_app_name("bread box").is_err());
}
#[test]
fn application_id_uses_com_breadway_prefix() {
assert_eq!(application_id("breadbox").unwrap(), "com.breadway.breadbox");
assert_eq!(
application_id("bread-polkit").unwrap(),
"com.breadway.bread-polkit"
);
}
#[test]
fn application_id_rejects_invalid_name() {
assert!(application_id("").is_err());
assert!(application_id("bread.box").is_err());
}
#[test]
fn try_acquire_rejects_invalid_name_before_lock() {
match try_acquire("") {
Err(err) => assert_eq!(err.kind(), io::ErrorKind::InvalidInput),
Ok(_) => panic!("empty name must not acquire a lock"),
}
match try_acquire("bread.box") {
Err(err) => assert_eq!(err.kind(), io::ErrorKind::InvalidInput),
Ok(_) => panic!("dotted name must not acquire a lock"),
}
}
#[test]
fn try_acquire_accepts_valid_name() {
let name = format!("bread-app-id-test-{}", std::process::id());
match try_acquire(&name).unwrap() {
Acquire::Acquired(_guard) => {}
Acquire::HeldByOther(_) => panic!("expected first acquire to succeed"),
}
}
#[test]
fn toggle_or_kill_starts_when_nothing_else_is_running() {
let name = format!("bread-app-toggle-test-{}", std::process::id());
match toggle_or_kill(&name).unwrap() {
Toggle::Started(_guard) => {}
Toggle::KilledExisting => panic!("expected to start as the first instance"),
}
}
}

67
bread-app/src/lib.rs Normal file
View file

@ -0,0 +1,67 @@
//! GTK application bootstrap for bread desktop tools.
//!
//! New GTK tools should depend on this crate instead of copying a sixth
//! `main.rs` that wires a `com.breadway.*` application id, a
//! [`bread_utils::singleton`] lock, a layer-shell overlay, and a
//! `bread.command.<app>.**` listen loop.
//!
//! # What this is
//!
//! The pieces every bread GTK binary already copies:
//!
//! - [`application_id`] / [`parse_app_name`] — reverse-DNS id
//! (`com.breadway.breadbox`) and the same name used for the singleton
//! pid file.
//! - [`try_acquire`] / [`toggle_or_kill`] — [`bread_utils::singleton`]
//! wrappers that reject an invalid name before touching the lock.
//! - feature `gtk` — re-exports [`gtk_popup`] (`bread_utils::gtk_popup`)
//! for the full-screen overlay breadbox / breadclip / breadcast start
//! from.
//! - feature `bread-client` — [`listen_commands`] plus [`command_verb`] /
//! [`command_pattern`] so a tool can honor `bread.command.<app>.**`
//! without re-deriving the prefix strip.
//!
//! This crate does **not** migrate existing apps. Callers still own their
//! widgets, CSS, and clap. Screenshot / `--screenshot` helpers stay in
//! [`bread_utils::screenshot_cli`].
//!
//! # Example
//!
//! ```ignore
//! let _guard = match bread_app::try_acquire("breadbox")? {
//! bread_app::singleton::Acquire::Acquired(g) => g,
//! bread_app::singleton::Acquire::HeldByOther(_) => return Ok(()),
//! };
//! let app = gtk4::Application::builder()
//! .application_id(&bread_app::application_id("breadbox")?)
//! .build();
//!
//! #[cfg(feature = "gtk")]
//! app.connect_activate(|app| {
//! let window = bread_app::gtk_popup::new_overlay_window(app, "breadbox");
//! window.present();
//! });
//!
//! #[cfg(feature = "bread-client")]
//! let _commands = bread_app::listen_commands("box", |verb, event| {
//! // verb is the single segment after `bread.command.box.`
//! let _ = (verb, event);
//! })?;
//! ```
pub use bread_utils::singleton;
#[cfg(feature = "gtk")]
pub use bread_utils::gtk_popup;
mod id;
pub use id::{application_id, parse_app_name, toggle_or_kill, try_acquire, InvalidAppId};
#[cfg(feature = "bread-client")]
mod command;
#[cfg(feature = "bread-client")]
pub use bread_utils::bread_client::{BreadClient, BreadEvent, Subscription};
#[cfg(feature = "bread-client")]
pub use command::{command_pattern, command_verb, listen_commands, parse_command_id};

27
bread-polkit/Cargo.toml Normal file
View file

@ -0,0 +1,27 @@
[package]
name = "bread-polkit"
version.workspace = true
edition.workspace = true
license.workspace = true
authors.workspace = true
description = "Themed PolicyKit authentication agent for the bread desktop"
repository = "https://git.breadway.dev/Breadway/bread-ecosystem"
keywords = ["polkit", "gtk4", "wayland"]
[lib]
path = "src/lib.rs"
[[bin]]
name = "bread-polkit"
path = "src/main.rs"
[dependencies]
anyhow = { workspace = true }
bread-app = { path = "../bread-app", features = ["gtk"] }
bread-theme = { path = "../bread-theme", features = ["gtk"] }
gtk4 = { version = "0.11", features = ["v4_12"] }
serde = { workspace = true }
tokio = { version = "1", features = ["rt", "net", "sync", "time", "macros", "io-util", "process"] }
tracing = { workspace = true }
tracing-subscriber = { version = "0.3", default-features = false, features = ["fmt", "env-filter", "std"] }
zbus = { version = "5", default-features = false, features = ["tokio"] }

View file

@ -0,0 +1,12 @@
[Desktop Entry]
Type=Application
Name=Bread PolicyKit Agent
Comment=Themed PolicyKit authentication agent for the bread desktop
Exec=bread-polkit
Icon=dialog-password
Terminal=false
Categories=System;Security;
StartupNotify=false
X-GNOME-Autostart-Phase=Initialization
X-GNOME-AutoRestart=true
X-GNOME-Autostart-Notify=false

View file

@ -0,0 +1,10 @@
# bread-polkit — add to hyprland.conf
#
# Session authentication agent. Copy contrib/bread-polkit.desktop to
# ~/.config/autostart/ instead if you prefer XDG autostart.
exec-once = bread-polkit
# Optional: blur the overlay panel (namespace is bread-polkit).
layerrule = blur, bread-polkit
layerrule = ignorezero, bread-polkit

300
bread-polkit/src/agent.rs Normal file
View file

@ -0,0 +1,300 @@
//! Session-bus registration and the PolicyKit1 AuthenticationAgent.
use std::collections::HashMap;
use std::sync::{Arc, OnceLock};
use anyhow::{Context, Result};
use gtk4::glib;
use gtk4::prelude::*;
use serde::{Deserialize, Serialize};
use tokio::sync::{mpsc, Mutex};
use zbus::zvariant::{OwnedValue, Type, Value};
use zbus::{connection, interface, proxy, DBusError};
use bread_polkit::helper::{discover_transport, Transport};
use bread_polkit::identity::{current_uid, pick_user, read_passwd, users_from_uids, UnixUser};
use bread_polkit::session::session_id;
use crate::auth::{self, Outcome};
use crate::ui::{self, Prompt};
pub const OBJECT_PATH: &str = "/com/breadway/PolicyKit1/AuthenticationAgent";
/// Reply from the GTK prompt.
#[derive(Debug)]
pub enum UserAction {
Submit { username: String, password: String },
Cancel,
}
#[derive(Debug, DBusError)]
#[zbus(prefix = "org.freedesktop.PolicyKit1.Error")]
enum AgentError {
#[zbus(error)]
ZBus(zbus::Error),
Failed(String),
Cancelled(String),
}
#[derive(Debug, Deserialize, Serialize, Type)]
struct Identity {
kind: String,
details: HashMap<String, OwnedValue>,
}
#[derive(Debug, Clone, Deserialize, Serialize, Type)]
struct Subject {
kind: String,
details: HashMap<String, OwnedValue>,
}
#[proxy(
interface = "org.freedesktop.PolicyKit1.Authority",
default_service = "org.freedesktop.PolicyKit1",
default_path = "/org/freedesktop/PolicyKit1/Authority"
)]
trait Authority {
fn register_authentication_agent(
&self,
subject: &Subject,
locale: &str,
object_path: &str,
) -> zbus::Result<()>;
fn unregister_authentication_agent(
&self,
subject: &Subject,
object_path: &str,
) -> zbus::Result<()>;
}
struct Agent {
transport: Transport,
pending: Arc<Mutex<Option<mpsc::Sender<UserAction>>>>,
}
#[interface(name = "org.freedesktop.PolicyKit1.AuthenticationAgent")]
impl Agent {
async fn begin_authentication(
&mut self,
action_id: String,
message: String,
_icon_name: String,
_details: HashMap<String, String>,
cookie: String,
identities: Vec<Identity>,
) -> Result<(), AgentError> {
tracing::info!(%action_id, %cookie, "BeginAuthentication");
let users = unix_users(&identities);
let username = pick_user(&users, current_uid())
.map(|u| u.name.clone())
.ok_or_else(|| AgentError::Failed("no unix-user identity".into()))?;
let (tx, mut rx) = mpsc::channel(4);
*self.pending.lock().await = Some(tx.clone());
let prompt = Prompt {
cookie: cookie.clone(),
message: message.clone(),
action_id: action_id.clone(),
username: username.clone(),
reply: tx,
};
invoke_ui(move || {
if let Some(app) = running_app() {
ui::show_prompt(&app, prompt);
}
});
let result = self.drive_prompt(&cookie, &username, &mut rx).await;
*self.pending.lock().await = None;
let cookie_close = cookie.clone();
invoke_ui(move || ui::close_prompt(&cookie_close));
result
}
async fn cancel_authentication(&self, cookie: String) {
tracing::info!(%cookie, "CancelAuthentication");
if let Some(tx) = self.pending.lock().await.as_ref() {
let _ = tx.try_send(UserAction::Cancel);
}
invoke_ui(move || ui::close_prompt(&cookie));
}
}
impl Agent {
async fn drive_prompt(
&self,
cookie: &str,
default_user: &str,
rx: &mut mpsc::Receiver<UserAction>,
) -> Result<(), AgentError> {
loop {
match rx.recv().await {
None => {
return Err(AgentError::Cancelled("authentication prompt closed".into()));
}
Some(UserAction::Cancel) => {
return Err(AgentError::Cancelled("user cancelled".into()));
}
Some(UserAction::Submit { username, password }) => {
let user = if username.is_empty() {
default_user
} else {
username.as_str()
};
match auth::authenticate(&self.transport, user, cookie, &password).await {
Ok(Outcome::Success) => return Ok(()),
Ok(Outcome::Failure { message }) => {
let text = message
.unwrap_or_else(|| auth::default_failure_message().to_string());
let cookie = cookie.to_string();
invoke_ui(move || ui::show_retry(&cookie, &text));
}
Err(e) => {
tracing::warn!("helper: {e:#}");
let text = e.to_string();
let cookie = cookie.to_string();
invoke_ui(move || ui::show_retry(&cookie, &text));
}
}
}
}
}
}
}
fn unix_users(identities: &[Identity]) -> Vec<UnixUser> {
let mut uids = Vec::new();
for identity in identities {
if identity.kind != "unix-user" {
continue;
}
if let Some(uid) = uid_from_details(&identity.details) {
uids.push(uid);
}
}
users_from_uids(&uids, &read_passwd())
}
fn uid_from_details(details: &HashMap<String, OwnedValue>) -> Option<u32> {
let value = details.get("uid")?;
u32::try_from(value).ok().or_else(|| {
i32::try_from(value)
.ok()
.and_then(|n| u32::try_from(n).ok())
})
}
fn running_app() -> Option<gtk4::Application> {
gtk4::gio::Application::default().and_then(|app| app.downcast::<gtk4::Application>().ok())
}
/// GTK thread-default context, captured in [`spawn`] so the dbus thread
/// can `invoke` onto the UI thread instead of its own empty context.
static GTK_CTX: OnceLock<glib::MainContext> = OnceLock::new();
fn invoke_ui(f: impl FnOnce() + Send + 'static) {
let ctx = GTK_CTX
.get()
.cloned()
.unwrap_or_else(glib::MainContext::default);
ctx.invoke(f);
}
fn unix_session_subject(id: &str) -> Result<Subject> {
let value = Value::from(id.to_string());
let owned = OwnedValue::try_from(value).context("session-id variant")?;
let mut details = HashMap::new();
details.insert("session-id".into(), owned);
Ok(Subject {
kind: "unix-session".into(),
details,
})
}
/// Spawn the system-bus agent on a background thread. Returns once the
/// thread has been started; registration errors quit the GTK app.
///
/// Must be called from the GTK thread so the main context we capture is
/// the one driving the password prompt.
pub fn spawn() -> Result<()> {
let _ = GTK_CTX.set(glib::MainContext::default());
std::thread::Builder::new()
.name("bread-polkit-dbus".into())
.spawn(move || {
let rt = match tokio::runtime::Builder::new_current_thread()
.enable_all()
.build()
{
Ok(rt) => rt,
Err(e) => {
invoke_ui(move || {
eprintln!("bread-polkit: tokio runtime failed: {e}");
if let Some(app) = running_app() {
app.quit();
}
});
return;
}
};
rt.block_on(async move {
if let Err(e) = run().await {
eprintln!("bread-polkit: {e:#}");
invoke_ui(|| {
if let Some(app) = running_app() {
app.quit();
}
});
}
});
})
.context("spawn dbus thread")?;
Ok(())
}
async fn run() -> Result<()> {
let transport = discover_transport().context(
"no polkit helper: expected /run/polkit/agent-helper.socket \
or /usr/lib/polkit-1/polkit-agent-helper-1",
)?;
tracing::info!(?transport, "using polkit helper");
let session = session_id().context(
"no session id (XDG_SESSION_ID / /proc/self/sessionid); \
cannot register a session authentication agent",
)?;
let subject = unix_session_subject(&session)?;
let locale = std::env::var("LANG").unwrap_or_else(|_| "C".into());
let agent = Agent {
transport,
pending: Arc::new(Mutex::new(None)),
};
let connection = connection::Builder::system()?
.serve_at(OBJECT_PATH, agent)?
.build()
.await
.context("system bus")?;
let authority = AuthorityProxy::new(&connection)
.await
.context("PolicyKit1 authority proxy")?;
authority
.register_authentication_agent(&subject, &locale, OBJECT_PATH)
.await
.context("RegisterAuthenticationAgent")?;
tracing::info!(%session, "registered as PolicyKit authentication agent");
std::future::pending::<()>().await;
#[allow(unreachable_code)]
{
let _ = authority
.unregister_authentication_agent(&subject, OBJECT_PATH)
.await;
Ok(())
}
}

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bread-polkit/src/auth.rs Normal file
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//! PAM conversation with the polkit agent helper.
use std::process::Stdio;
use anyhow::{Context, Result};
use tokio::io::{AsyncBufReadExt, AsyncWriteExt, BufReader};
use tokio::net::UnixStream;
use tokio::process::Command;
use bread_polkit::helper::{parse_helper_line, HelperLine, Transport};
/// Outcome of one helper conversation.
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum Outcome {
Success,
Failure { message: Option<String> },
}
/// Handshake + PAM loop for one password attempt.
pub async fn authenticate(
transport: &Transport,
username: &str,
cookie: &str,
password: &str,
) -> Result<Outcome> {
match transport {
Transport::Socket(path) => {
let mut stream = UnixStream::connect(path)
.await
.with_context(|| format!("connect {}", path.display()))?;
stream.write_all(username.as_bytes()).await?;
stream.write_all(b"\n").await?;
stream.write_all(cookie.as_bytes()).await?;
stream.write_all(b"\n").await?;
let (reader, writer) = stream.into_split();
converse(BufReader::new(reader), writer, password).await
}
Transport::Exec(path) => {
let mut child = Command::new(path)
.arg(username)
.env("LC_ALL", "C")
.stdin(Stdio::piped())
.stdout(Stdio::piped())
.stderr(Stdio::null())
.spawn()
.with_context(|| format!("spawn {}", path.display()))?;
let mut stdin = child.stdin.take().context("polkit helper has no stdin")?;
let stdout = child.stdout.take().context("polkit helper has no stdout")?;
stdin.write_all(cookie.as_bytes()).await?;
stdin.write_all(b"\n").await?;
let outcome = converse(BufReader::new(stdout), stdin, password).await;
let _ = child.wait().await;
outcome
}
}
}
async fn converse<R, W>(mut reader: BufReader<R>, mut writer: W, password: &str) -> Result<Outcome>
where
R: tokio::io::AsyncRead + Unpin,
W: tokio::io::AsyncWrite + Unpin,
{
let mut last_info: Option<String> = None;
let mut line = String::new();
loop {
line.clear();
let n = reader.read_line(&mut line).await?;
if n == 0 {
return Ok(Outcome::Failure {
message: last_info.take(),
});
}
match parse_helper_line(&line) {
HelperLine::PromptEchoOff(_) => {
writer.write_all(password.as_bytes()).await?;
writer.write_all(b"\n").await?;
writer.flush().await?;
}
HelperLine::PromptEchoOn(_) => {
// Visible prompt (username, etc.) — we already sent the
// identity in the handshake. An empty line is safer than
// echoing the password.
writer.write_all(b"\n").await?;
writer.flush().await?;
}
HelperLine::ErrorMsg(msg) | HelperLine::TextInfo(msg) => {
if !msg.is_empty() {
last_info = Some(msg);
}
}
HelperLine::Success => return Ok(Outcome::Success),
HelperLine::Failure => {
return Ok(Outcome::Failure {
message: last_info.take(),
});
}
HelperLine::Other(other) => {
if !other.is_empty() {
tracing::debug!("helper: {other}");
}
}
}
}
}
/// Shared default when the helper gives no `PAM_*` text on failure.
pub fn default_failure_message() -> &'static str {
"Authentication failed. Try again."
}

205
bread-polkit/src/helper.rs Normal file
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//! `polkit-agent-helper-1` transport and PAM line parser.
//!
//! Arch polkit 127+ talks over `/run/polkit/agent-helper.socket`. Older
//! builds still spawn the setuid helper at
//! `/usr/lib/polkit-1/polkit-agent-helper-1`. Prefer the socket when it
//! exists.
use std::path::{Path, PathBuf};
/// How this agent will talk to polkit's helper.
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum Transport {
/// systemd socket-activated helper (polkit 127+).
Socket(PathBuf),
/// Legacy setuid helper binary.
Exec(PathBuf),
}
const SOCKET_CANDIDATES: &[&str] = &["/run/polkit/agent-helper.socket"];
const HELPER_CANDIDATES: &[&str] = &[
"/usr/lib/polkit-1/polkit-agent-helper-1",
"/usr/libexec/polkit-1/polkit-agent-helper-1",
];
/// One stdout line from the helper after the cookie handshake.
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum HelperLine {
PromptEchoOff(String),
PromptEchoOn(String),
ErrorMsg(String),
TextInfo(String),
Success,
Failure,
Other(String),
}
/// Pick a live transport: `BREAD_POLKIT_SOCKET` / `BREAD_POLKIT_HELPER`
/// if set and present, otherwise the first existing well-known path.
pub fn discover_transport() -> Option<Transport> {
discover_transport_from(
std::env::var_os("BREAD_POLKIT_SOCKET")
.map(PathBuf::from)
.as_deref(),
std::env::var_os("BREAD_POLKIT_HELPER")
.map(PathBuf::from)
.as_deref(),
SOCKET_CANDIDATES,
HELPER_CANDIDATES,
|p| p.exists(),
)
}
/// Testable discovery: `exists` is injected so unit tests do not need a
/// real `/run/polkit` socket.
pub fn discover_transport_from(
socket_override: Option<&Path>,
helper_override: Option<&Path>,
sockets: &[&str],
helpers: &[&str],
exists: impl Fn(&Path) -> bool,
) -> Option<Transport> {
if let Some(path) = socket_override {
if exists(path) {
return Some(Transport::Socket(path.to_path_buf()));
}
}
for candidate in sockets {
let path = Path::new(candidate);
if exists(path) {
return Some(Transport::Socket(path.to_path_buf()));
}
}
if let Some(path) = helper_override {
if exists(path) {
return Some(Transport::Exec(path.to_path_buf()));
}
}
for candidate in helpers {
let path = Path::new(candidate);
if exists(path) {
return Some(Transport::Exec(path.to_path_buf()));
}
}
None
}
/// Parse one helper protocol line. Prefix match is case-sensitive and
/// matches polkit's own `PAM_*` / `SUCCESS` / `FAILURE` tokens.
pub fn parse_helper_line(line: &str) -> HelperLine {
let line = line.trim_end_matches(['\r', '\n']);
if line == "SUCCESS" || line.starts_with("SUCCESS") {
return HelperLine::Success;
}
if line == "FAILURE" || line.starts_with("FAILURE") {
return HelperLine::Failure;
}
if let Some(rest) = line.strip_prefix("PAM_PROMPT_ECHO_OFF") {
return HelperLine::PromptEchoOff(rest.trim().to_string());
}
if let Some(rest) = line.strip_prefix("PAM_PROMPT_ECHO_ON") {
return HelperLine::PromptEchoOn(rest.trim().to_string());
}
if let Some(rest) = line.strip_prefix("PAM_ERROR_MSG") {
return HelperLine::ErrorMsg(rest.trim().to_string());
}
if let Some(rest) = line.strip_prefix("PAM_TEXT_INFO") {
return HelperLine::TextInfo(rest.trim().to_string());
}
HelperLine::Other(line.to_string())
}
#[cfg(test)]
mod tests {
use super::*;
use std::collections::HashSet;
use std::path::PathBuf;
#[test]
fn parse_helper_line_known_tokens() {
assert_eq!(parse_helper_line("SUCCESS"), HelperLine::Success);
assert_eq!(parse_helper_line("SUCCESS\n"), HelperLine::Success);
assert_eq!(parse_helper_line("FAILURE"), HelperLine::Failure);
assert_eq!(
parse_helper_line("PAM_PROMPT_ECHO_OFF Password:"),
HelperLine::PromptEchoOff("Password:".into())
);
assert_eq!(
parse_helper_line("PAM_PROMPT_ECHO_OFF"),
HelperLine::PromptEchoOff(String::new())
);
assert_eq!(
parse_helper_line("PAM_PROMPT_ECHO_ON login:"),
HelperLine::PromptEchoOn("login:".into())
);
assert_eq!(
parse_helper_line("PAM_ERROR_MSG Authentication failure"),
HelperLine::ErrorMsg("Authentication failure".into())
);
assert_eq!(
parse_helper_line("PAM_TEXT_INFO Account locked"),
HelperLine::TextInfo("Account locked".into())
);
assert_eq!(
parse_helper_line("garbage"),
HelperLine::Other("garbage".into())
);
}
#[test]
fn discover_prefers_socket_over_exec() {
let present: HashSet<PathBuf> = [
"/run/polkit/agent-helper.socket",
"/usr/lib/polkit-1/polkit-agent-helper-1",
]
.into_iter()
.map(PathBuf::from)
.collect();
let got = discover_transport_from(None, None, SOCKET_CANDIDATES, HELPER_CANDIDATES, |p| {
present.contains(p)
});
assert_eq!(
got,
Some(Transport::Socket(PathBuf::from(
"/run/polkit/agent-helper.socket"
)))
);
}
#[test]
fn discover_falls_back_to_helper_binary() {
let present: HashSet<PathBuf> = ["/usr/lib/polkit-1/polkit-agent-helper-1"]
.into_iter()
.map(PathBuf::from)
.collect();
let got = discover_transport_from(None, None, SOCKET_CANDIDATES, HELPER_CANDIDATES, |p| {
present.contains(p)
});
assert_eq!(
got,
Some(Transport::Exec(PathBuf::from(
"/usr/lib/polkit-1/polkit-agent-helper-1"
)))
);
}
#[test]
fn discover_override_socket_wins_when_present() {
let override_path = Path::new("/tmp/bread-polkit-test.sock");
let got = discover_transport_from(
Some(override_path),
None,
SOCKET_CANDIDATES,
HELPER_CANDIDATES,
|p| p == override_path,
);
assert_eq!(got, Some(Transport::Socket(override_path.to_path_buf())));
}
#[test]
fn discover_none_when_nothing_exists() {
let got =
discover_transport_from(None, None, SOCKET_CANDIDATES, HELPER_CANDIDATES, |_| false);
assert_eq!(got, None);
}
}

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//! Unix-user identities from a PolicyKit `BeginAuthentication` call.
/// A `unix-user` identity the agent can authenticate as.
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct UnixUser {
pub uid: u32,
pub name: String,
}
/// Look up `uid` in a passwd-file dump (`name:x:uid:...` lines).
pub fn name_for_uid(uid: u32, passwd: &str) -> Option<String> {
for line in passwd.lines() {
if line.starts_with('#') {
continue;
}
let mut parts = line.split(':');
let name = parts.next()?;
let _pw = parts.next()?;
let id = parts.next()?.parse::<u32>().ok()?;
if id == uid && !name.is_empty() {
return Some(name.to_string());
}
}
None
}
/// Resolve each uid to a [`UnixUser`], falling back to `uid N` when
/// `/etc/passwd` has no name.
pub fn users_from_uids(uids: &[u32], passwd: &str) -> Vec<UnixUser> {
uids.iter()
.copied()
.map(|uid| UnixUser {
uid,
name: name_for_uid(uid, passwd).unwrap_or_else(|| format!("uid {uid}")),
})
.collect()
}
/// Prefer the process's own uid when it is in `users`, otherwise the first.
pub fn pick_user<'a>(users: &'a [UnixUser], current_uid: Option<u32>) -> Option<&'a UnixUser> {
if let Some(uid) = current_uid {
if let Some(user) = users.iter().find(|u| u.uid == uid) {
return Some(user);
}
}
users.first()
}
/// Real uid from a `/proc/self/status` dump (`Uid:\t<real> ...`).
pub fn uid_from_status(status: &str) -> Option<u32> {
for line in status.lines() {
let Some(rest) = line.strip_prefix("Uid:") else {
continue;
};
return rest.split_whitespace().next()?.parse().ok();
}
None
}
/// Current real uid, or `None` if `/proc/self/status` is unreadable.
pub fn current_uid() -> Option<u32> {
let status = std::fs::read_to_string("/proc/self/status").ok()?;
uid_from_status(&status)
}
/// Contents of `/etc/passwd`, or empty if unreadable.
pub fn read_passwd() -> String {
std::fs::read_to_string("/etc/passwd").unwrap_or_default()
}
#[cfg(test)]
mod tests {
use super::*;
const PASSWD: &str = "\
# comment
root:x:0:0:root:/root:/bin/sh
alice:x:1000:1000:Alice:/home/alice:/bin/zsh
bob:x:1001:1001:Bob:/home/bob:/bin/bash
";
#[test]
fn name_for_uid_reads_passwd_lines() {
assert_eq!(name_for_uid(0, PASSWD).as_deref(), Some("root"));
assert_eq!(name_for_uid(1000, PASSWD).as_deref(), Some("alice"));
assert_eq!(name_for_uid(99, PASSWD), None);
}
#[test]
fn users_from_uids_falls_back_to_uid_label() {
let users = users_from_uids(&[1000, 42], PASSWD);
assert_eq!(
users,
vec![
UnixUser {
uid: 1000,
name: "alice".into()
},
UnixUser {
uid: 42,
name: "uid 42".into()
},
]
);
}
#[test]
fn pick_user_prefers_current_uid() {
let users = users_from_uids(&[0, 1000], PASSWD);
let picked = pick_user(&users, Some(1000)).unwrap();
assert_eq!(picked.name, "alice");
}
#[test]
fn pick_user_falls_back_to_first() {
let users = users_from_uids(&[0, 1000], PASSWD);
let picked = pick_user(&users, Some(7)).unwrap();
assert_eq!(picked.name, "root");
assert!(pick_user(&[], Some(1000)).is_none());
}
#[test]
fn uid_from_status_reads_real_uid() {
let status = "Name:\tbread-polkit\nUid:\t1000\t1000\t1000\t1000\n";
assert_eq!(uid_from_status(status), Some(1000));
assert_eq!(uid_from_status("Name:\tfoo\n"), None);
}
}

10
bread-polkit/src/lib.rs Normal file
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//! Non-GTK PolicyKit helper logic for `bread-polkit`.
//!
//! The binary (`bread-polkit`) registers as a session authentication
//! agent and shows a themed password prompt. This library is the
//! transport / identity / session parsing that can be unit-tested
//! without a display.
pub mod helper;
pub mod identity;
pub mod session;

94
bread-polkit/src/main.rs Normal file
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//! bread-polkit — themed PolicyKit authentication agent.
//!
//! Registers on the `org.freedesktop.PolicyKit1.AuthenticationAgent`
//! interface and shows a bread-theme GTK4 password prompt. This is an
//! agent, not a wrapper that execs `polkit-gnome`.
//!
//! Autostart: copy `contrib/bread-polkit.desktop` to
//! `~/.config/autostart/`, or add `exec-once = bread-polkit` to Hyprland.
mod agent;
mod auth;
mod ui;
use bread_app::singleton::Acquire;
use gtk4::prelude::*;
const APP_NAME: &str = "bread-polkit";
fn main() {
let arg = std::env::args().nth(1);
match arg.as_deref() {
Some("-h") | Some("--help") => {
print_help();
return;
}
Some("-V") | Some("--version") => {
println!("bread-polkit {}", env!("CARGO_PKG_VERSION"));
return;
}
Some(other) => {
eprintln!("bread-polkit: unknown argument '{other}'");
print_help();
std::process::exit(2);
}
None => {}
}
tracing_subscriber::fmt()
.with_env_filter(
tracing_subscriber::EnvFilter::try_from_default_env()
.unwrap_or_else(|_| tracing_subscriber::EnvFilter::new("info")),
)
.with_target(false)
.init();
let _guard = match bread_app::try_acquire(APP_NAME) {
Ok(Acquire::Acquired(g)) => Some(g),
Ok(Acquire::HeldByOther(pid)) => {
eprintln!("bread-polkit: already running (pid {pid:?})");
std::process::exit(0);
}
Err(e) => {
eprintln!("bread-polkit: singleton lock unavailable ({e}); continuing");
None
}
};
let app_id = bread_app::application_id(APP_NAME).expect("static app name");
let app = gtk4::Application::builder().application_id(&app_id).build();
app.connect_activate(|app| {
bread_theme::gtk::apply_shared();
bread_theme::gtk::apply_app_css(ui::app_css);
// No window until polkit asks; hold so GApplication stays alive.
std::mem::forget(app.hold());
if let Err(e) = agent::spawn() {
eprintln!("bread-polkit: {e:#}");
app.quit();
}
});
app.run();
}
fn print_help() {
print!(
"\
bread-polkit themed PolicyKit authentication agent
Usage:
bread-polkit
bread-polkit --help
bread-polkit --version
Autostart (pick one):
cp contrib/bread-polkit.desktop ~/.config/autostart/
exec-once = bread-polkit # Hyprland
The agent talks to the polkit1 AuthenticationAgent API and prompts for
a password. It does not exec polkit-gnome. Not a bakery product; not
on the BOS ISO lockfile.
"
);
}

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//! Session subject for `RegisterAuthenticationAgent`.
/// Logind session id from `XDG_SESSION_ID`, falling back to
/// `/proc/self/sessionid` when the kernel has one.
pub fn session_id() -> Option<String> {
let xdg = std::env::var("XDG_SESSION_ID").ok();
let proc = std::fs::read_to_string("/proc/self/sessionid").ok();
session_id_from(xdg.as_deref(), proc.as_deref())
}
/// `None` when both sources are empty or the kernel reports the
/// unsigned `-1` sentinel (`4294967295`) meaning "no session".
pub fn session_id_from(xdg: Option<&str>, proc_sessionid: Option<&str>) -> Option<String> {
if let Some(id) = xdg.map(str::trim).filter(|s| !s.is_empty()) {
return Some(id.to_string());
}
let raw = proc_sessionid?.trim();
if raw.is_empty() || raw == "4294967295" {
return None;
}
Some(raw.to_string())
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn prefers_xdg_session_id() {
assert_eq!(session_id_from(Some("3"), Some("7")).as_deref(), Some("3"));
assert_eq!(
session_id_from(Some(" 3 "), Some("7")).as_deref(),
Some("3")
);
}
#[test]
fn falls_back_to_proc_sessionid() {
assert_eq!(session_id_from(Some(""), Some("7")).as_deref(), Some("7"));
assert_eq!(session_id_from(None, Some("7\n")).as_deref(), Some("7"));
}
#[test]
fn rejects_unset_kernel_session() {
assert_eq!(session_id_from(None, Some("4294967295")), None);
assert_eq!(session_id_from(Some(""), Some("")), None);
assert_eq!(session_id_from(None, None), None);
}
}

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bread-polkit/src/ui.rs Normal file
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//! GTK4 password prompt, themed with bread-theme.
use std::cell::RefCell;
use std::rc::Rc;
use gtk4::gdk::Key;
use gtk4::glib::{self, Propagation};
use gtk4::prelude::*;
use gtk4::{
Align, Application, ApplicationWindow, Box as GBox, Button, Entry, EventControllerKey, Label,
Orientation,
};
use bread_theme::tokens;
use crate::agent::UserAction;
const PANEL_WIDTH: i32 = 400;
struct Active {
cookie: String,
window: ApplicationWindow,
password: Entry,
error: Label,
reply: tokio::sync::mpsc::Sender<UserAction>,
username: String,
}
thread_local! {
static ACTIVE: RefCell<Option<Active>> = const { RefCell::new(None) };
}
/// App-specific rules layered on the shared bread-theme stylesheet.
pub fn app_css() -> String {
format!(
".polkit-panel {{\
background-color: @surface; color: @on-surface;\
border-radius: {r}px; padding: {pad}px;\
min-width: {w}px;\
}}\n\
.polkit-title {{ font-size: 1.4em; font-weight: bold; }}\n\
.polkit-message {{ opacity: 0.85; }}\n\
.polkit-identity {{ opacity: 0.7; font-size: {sec}px; }}\n\
.polkit-error {{ color: @on-red; }}\n\
.polkit-buttons {{ padding-top: {sm}px; }}\n",
r = tokens::RADIUS_PRIMARY,
pad = tokens::SPACE_XL,
w = PANEL_WIDTH,
sec = tokens::FONT_SIZE_SECONDARY,
sm = tokens::SPACE_SM,
)
}
pub struct Prompt {
pub cookie: String,
pub message: String,
pub action_id: String,
pub username: String,
pub reply: tokio::sync::mpsc::Sender<UserAction>,
}
/// Show (or replace) the password overlay for this cookie.
pub fn show_prompt(app: &Application, prompt: Prompt) {
close_if_other_cookie(&prompt.cookie);
if ACTIVE.with(|a| {
a.borrow()
.as_ref()
.is_some_and(|active| active.cookie == prompt.cookie)
}) {
present_existing(&prompt);
return;
}
let window = bread_app::gtk_popup::new_overlay_window(app, "bread-polkit");
let panel = GBox::new(Orientation::Vertical, tokens::SPACE_MD as i32);
panel.add_css_class("polkit-panel");
panel.add_css_class("card");
panel.set_halign(Align::Center);
panel.set_valign(Align::Center);
panel.set_size_request(PANEL_WIDTH, -1);
let title = Label::new(Some("Authentication required"));
title.add_css_class("polkit-title");
title.add_css_class("page-title");
title.set_halign(Align::Start);
title.set_wrap(true);
panel.append(&title);
let message = if prompt.message.trim().is_empty() {
prompt.action_id.clone()
} else {
prompt.message.clone()
};
let msg = Label::new(Some(&message));
msg.add_css_class("polkit-message");
msg.set_halign(Align::Start);
msg.set_wrap(true);
msg.set_xalign(0.0);
panel.append(&msg);
if !prompt.username.is_empty() {
let identity = Label::new(Some(&format!("Authenticating as {}", prompt.username)));
identity.add_css_class("polkit-identity");
identity.add_css_class("dim-label");
identity.set_halign(Align::Start);
panel.append(&identity);
}
let error = Label::new(None);
error.add_css_class("polkit-error");
error.set_halign(Align::Start);
error.set_wrap(true);
error.set_visible(false);
panel.append(&error);
let password = Entry::builder()
.visibility(false)
.input_purpose(gtk4::InputPurpose::Password)
.placeholder_text("Password")
.hexpand(true)
.build();
panel.append(&password);
let buttons = GBox::new(Orientation::Horizontal, tokens::SPACE_SM as i32);
buttons.add_css_class("polkit-buttons");
buttons.set_halign(Align::End);
let cancel = Button::with_label("Cancel");
cancel.add_css_class("flat");
let confirm = Button::with_label("Authenticate");
confirm.add_css_class("suggested-action");
buttons.append(&cancel);
buttons.append(&confirm);
panel.append(&buttons);
window.set_child(Some(&panel));
let reply = prompt.reply.clone();
let cookie = prompt.cookie.clone();
let username = prompt.username.clone();
let submit = {
let password = password.clone();
let reply = reply.clone();
let username = username.clone();
Rc::new(move || {
let secret = password.text().to_string();
password.set_text("");
let _ = reply.try_send(UserAction::Submit {
username: username.clone(),
password: secret,
});
})
};
let cancel_fn = {
let reply = reply.clone();
let window = window.clone();
Rc::new(move || {
let _ = reply.try_send(UserAction::Cancel);
window.close();
ACTIVE.with(|a| a.replace(None));
})
};
confirm.connect_clicked({
let submit = submit.clone();
move |_| submit()
});
password.connect_activate({
let submit = submit.clone();
move |_| submit()
});
cancel.connect_clicked({
let cancel_fn = cancel_fn.clone();
move |_| cancel_fn()
});
let keys = EventControllerKey::new();
keys.connect_key_pressed({
let cancel_fn = cancel_fn.clone();
move |_, key, _, _| {
if key == Key::Escape {
cancel_fn();
Propagation::Stop
} else {
Propagation::Proceed
}
}
});
window.add_controller(keys);
bread_app::gtk_popup::close_on_outside_click(&window, &panel, {
let cancel_fn = cancel_fn.clone();
move || cancel_fn()
});
window.connect_close_request({
let reply = reply.clone();
move |_| {
let closing_ours = ACTIVE.with(|a| {
a.borrow()
.as_ref()
.is_some_and(|active| active.cookie == cookie)
});
if closing_ours {
let _ = reply.try_send(UserAction::Cancel);
ACTIVE.with(|a| a.replace(None));
}
glib::Propagation::Proceed
}
});
ACTIVE.with(|a| {
*a.borrow_mut() = Some(Active {
cookie: prompt.cookie,
window: window.clone(),
password: password.clone(),
error,
reply,
username,
});
});
window.present();
password.grab_focus();
}
fn present_existing(prompt: &Prompt) {
ACTIVE.with(|a| {
if let Some(active) = a.borrow_mut().as_mut() {
active.reply = prompt.reply.clone();
active.username = prompt.username.clone();
active.error.set_visible(false);
active.password.set_text("");
active.window.present();
active.password.grab_focus();
}
});
}
/// Show a retry message on the open dialog for `cookie`.
pub fn show_retry(cookie: &str, message: &str) {
ACTIVE.with(|a| {
let mut guard = a.borrow_mut();
let Some(active) = guard.as_mut() else {
return;
};
if active.cookie != cookie {
return;
}
active.error.set_label(message);
active.error.set_visible(true);
active.password.set_text("");
active.window.present();
active.password.grab_focus();
});
}
/// Close the dialog if it is still showing `cookie`.
pub fn close_prompt(cookie: &str) {
ACTIVE.with(|a| {
let Some(active) = a.borrow_mut().take() else {
return;
};
if active.cookie == cookie {
active.window.close();
} else {
*a.borrow_mut() = Some(active);
}
});
}
fn close_if_other_cookie(cookie: &str) {
ACTIVE.with(|a| {
let Some(active) = a.borrow_mut().take() else {
return;
};
if active.cookie == cookie {
*a.borrow_mut() = Some(active);
} else {
active.window.close();
}
});
}