File size: 3,164 Bytes
1269259 | 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 | // SPF Smart Gateway - Path Resolution
// Copyright 2026 Joseph Stone - All Rights Reserved
//
// Single source of truth for all SPF path resolution.
// Uses SPF_ROOT env var (preferred) or walk-up discovery from binary location.
// Cached via OnceLock for zero-overhead repeated access.
//
// SECURITY NOTE: Write allowlist paths are computed here but ENFORCED
// in validate.rs. The allowlist remains compiled Rust, not configurable.
//
// CLONE NOTE: SPF_ROOT env var is checked FIRST so cloned instances
// resolve to their own root, not the primary's. Walk-up from binary
// location is the fallback for single-instance setups.
use std::path::{Path, PathBuf};
use std::sync::OnceLock;
static SPF_ROOT_CACHE: OnceLock<PathBuf> = OnceLock::new();
static ACTUAL_HOME_CACHE: OnceLock<PathBuf> = OnceLock::new();
/// Find SPFsmartGATE root — supports cloned instances.
///
/// Resolution order:
/// 1. SPF_ROOT environment variable (clone-safe, explicit)
/// 2. Walk up from binary location looking for Cargo.toml
/// 3. HOME env + /SPFsmartGATE
/// 4. Panic (unrecoverable — cannot operate without known root)
pub fn spf_root() -> &'static Path {
SPF_ROOT_CACHE.get_or_init(|| {
// PRIMARY: SPF_ROOT env var — explicit, clone-safe
if let Ok(root) = std::env::var("SPF_ROOT") {
let p = PathBuf::from(&root);
if p.exists() {
return p;
}
}
// FALLBACK: walk up from binary location
if let Ok(exe) = std::env::current_exe() {
if let Ok(canonical) = exe.canonicalize() {
let mut dir = canonical.parent();
while let Some(d) = dir {
if d.join("Cargo.toml").exists() {
return d.to_path_buf();
}
dir = d.parent();
}
}
}
// Last resort: HOME/SPFsmartGATE
if let Ok(home) = std::env::var("HOME") {
return PathBuf::from(home).join("SPFsmartGATE");
}
panic!("Cannot determine SPFsmartGATE root: SPF_ROOT not set, binary walk-up failed, HOME not set");
})
}
/// Actual user home directory — parent of SPFsmartGATE root.
///
/// Resolution order:
/// 1. Parent directory of spf_root()
/// 2. HOME environment variable
/// 3. Panic
pub fn actual_home() -> &'static Path {
ACTUAL_HOME_CACHE.get_or_init(|| {
if let Some(parent) = spf_root().parent() {
return parent.to_path_buf();
}
if let Ok(home) = std::env::var("HOME") {
return PathBuf::from(home);
}
panic!("Cannot determine home directory: spf_root has no parent and HOME not set");
})
}
/// System package manager path — platform-detected at compile time.
/// Android/Termux: PREFIX env or /data/data/com.termux/files/usr
/// Linux/macOS: /usr
pub fn system_pkg_path() -> String {
if cfg!(target_os = "android") {
if let Ok(prefix) = std::env::var("PREFIX") {
return prefix;
}
"/data/data/com.termux/files/usr".to_string()
} else {
"/usr".to_string()
}
}
|