accent 0.1.2

Installer and updater for Accent CMS — downloads, verifies and installs signed Accent releases
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140

//! PATH and shadowing warnings after an install.
//!
//! Placing the binary is not the same as the shell finding it: the install
//! directory may not be on PATH at all, or an older copy earlier in PATH may
//! win. Both are worth a warning the moment they can be detected, which is
//! right after the install, rather than the next time `accent --version`
//! surprises someone.

use std::path::{Path, PathBuf};
use std::process::Command;

use crate::platform::BIN_NAME;
use crate::ui::Ui;

use super::binary_in;

/// Warns when the install directory is not on PATH, with the incantation for
/// the user's shell.
pub fn check_path(dir: &Path, ui: &Ui) {
    if on_path(dir) {
        return;
    }

    ui.blank();
    ui.warn(format!("Note: {} is not on your PATH.", dir.display()));

    if cfg!(windows) {
        ui.warn("To add it, run:");
        ui.warn("");
        ui.warn("  $path = [Environment]::GetEnvironmentVariable('Path', 'User')");
        ui.warn(format!(
            "  [Environment]::SetEnvironmentVariable('Path', \"$path;{}\", 'User')",
            dir.display()
        ));
        ui.warn("");
        ui.warn("Then restart your terminal.");
        return;
    }

    let shell = std::env::var("SHELL").unwrap_or_default();
    let dir = dir.display();
    if shell.ends_with("fish") {
        ui.warn("Add it by appending this to ~/.config/fish/config.fish:");
        ui.warn(format!("  fish_add_path {dir}"));
    } else {
        let profile = if shell.ends_with("zsh") {
            "~/.zshrc"
        } else {
            "~/.bashrc"
        };
        ui.warn(format!("Add it by appending this to {profile}:"));
        ui.warn(format!("  export PATH=\"{dir}:$PATH\""));
    }
    ui.warn("Then restart your shell.");
}

/// Warns when `accent` resolves to a different binary than the one just
/// installed.
///
/// The shell resolves `accent` by PATH order, not by what this installer
/// wrote. A stale copy earlier in PATH — a `cargo install`ed one in
/// `~/.cargo/bin` is the usual case — silently wins, and `accent --version`
/// keeps reporting the old build while the user believes they upgraded.
pub fn check_shadowing(dir: &Path, ui: &Ui) {
    let installed = binary_in(dir);
    let Some(resolved) = resolve_on_path(BIN_NAME) else {
        return;
    };
    if same_file(&resolved, &installed) {
        return;
    }

    let version = Command::new(&resolved)
        .arg("--version")
        .output()
        .ok()
        .filter(|out| out.status.success())
        .map(|out| String::from_utf8_lossy(&out.stdout).trim().to_string())
        .filter(|text| !text.is_empty())
        .unwrap_or_else(|| "unknown version".to_string());

    ui.blank();
    ui.warn("Warning: 'accent' currently resolves to a different binary:");
    ui.warn(format!("  {} ({version})", resolved.display()));
    ui.warn(format!(
        "which shadows the up-to-date binary at {}.",
        installed.display()
    ));
    if cfg!(windows) {
        ui.warn(format!(
            "Remove the shadowing binary or move {} earlier in your PATH,",
            dir.display()
        ));
        ui.warn("then start a new terminal.");
    } else {
        ui.warn(format!(
            "Remove the shadowing binary or move {} earlier in your PATH,",
            dir.display()
        ));
        ui.warn("then run 'hash -r' (bash/zsh) or restart your shell.");
    }
}

/// Whether `dir` is one of the entries in `PATH`.
pub fn on_path(dir: &Path) -> bool {
    std::env::var_os("PATH")
        .map(|path| std::env::split_paths(&path).any(|entry| entry == dir))
        .unwrap_or(false)
}

/// First `name` on PATH, the way the shell would pick it.
pub fn resolve_on_path(name: &str) -> Option<PathBuf> {
    let path = std::env::var_os("PATH")?;
    std::env::split_paths(&path)
        .map(|dir| dir.join(name))
        .find(|candidate| is_executable(candidate))
}

fn is_executable(path: &Path) -> bool {
    #[cfg(unix)]
    {
        use std::os::unix::fs::PermissionsExt;
        std::fs::metadata(path)
            .map(|meta| meta.is_file() && meta.permissions().mode() & 0o111 != 0)
            .unwrap_or(false)
    }
    #[cfg(not(unix))]
    {
        path.is_file()
    }
}

/// Compares two paths after resolving symlinks, so `~/.local/bin/accent` and a
/// symlink pointing at it are not reported as shadowing each other.
fn same_file(a: &Path, b: &Path) -> bool {
    match (a.canonicalize(), b.canonicalize()) {
        (Ok(a), Ok(b)) => a == b,
        _ => a == b,
    }
}