The update of cargo metadata is controlled through deny const

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "shadow-rs"
-version = "0.35.0"
+version = "0.35.1"
 authors = ["baoyachi <[email protected]>"]
 edition = "2021"
 description = "A build-time information stored in your rust project"

example_shadow_hook/build.rs

@@ -13,15 +13,16 @@ fn hook(file: &File) -> SdResult<()> {
 }
 
 fn append_write_const(mut file: &File) -> SdResult<()> {
-    let hook_const: &str = r#"pub const HOOK_CONST: &str = "hello hook const";"#;
+    let hook_const: &str = r#"#[allow(clippy::all, clippy::pedantic, clippy::restriction, clippy::nursery)]
+pub const HOOK_CONST: &str = "hello hook const";"#;
     writeln!(file, "{hook_const}")?;
     Ok(())
 }
 
 fn append_write_fn(mut file: &File) -> SdResult<()> {
     let hook_fn: &str = r#"
 pub fn hook_fn() -> &'static str{
-    "hello hook bar fn"
+    HOOK_CONST
 }"#;
     writeln!(file, "{hook_fn}")?;
     Ok(())

example_shadow_hook/src/main.rs

@@ -6,4 +6,5 @@ fn main() {
     // how to use new_hook function: https://github.com/baoyachi/shadow-rs/blob/master/example_shadow_hook/build.rs
     println!("const:{}", build::HOOK_CONST); //expect:'hello hook const'
     println!("fn:{}", build::hook_fn()); //expect:'hello hook bar fn'
+    assert_eq!(build::hook_fn(), build::HOOK_CONST);
 }

src/env.rs

@@ -2,7 +2,7 @@ use crate::build::*;
 use crate::date_time::now_date_time;
 use crate::env::dep_source_replace::filter_cargo_tree;
 use crate::err::SdResult;
-use crate::Format;
+use crate::{Format, Shadow};
 use is_debug::build_channel;
 use std::collections::BTreeMap;
 use std::env;
@@ -85,7 +85,8 @@ The project's semver pre-release version, as determined by the Cargo.toml manife
 pub const PKG_VERSION_PRE: ShadowConst = "PKG_VERSION_PRE";
 
 impl SystemEnv {
-    fn init(&mut self, std_env: &BTreeMap<String, String>) -> SdResult<()> {
+    fn init(&mut self, shadow: &Shadow) -> SdResult<()> {
+        let std_env = &shadow.std_env;
         let mut update_val = |c: ShadowConst, v: String| {
             if let Some(val) = self.map.get_mut(c) {
                 val.v = v;
@@ -110,23 +111,42 @@ impl SystemEnv {
             );
         }
 
-        if let Ok(out) = Command::new("cargo").arg("tree").output() {
-            let input = String::from_utf8(out.stdout)?;
-            if let Some(index) = input.find('\n') {
-                let lines =
-                    filter_cargo_tree(input.get(index..).unwrap_or_default().split('\n').collect());
-                update_val(CARGO_TREE, lines);
+        // If the build constant `CARGO_TREE` is not in the deny list,
+        // See discussions and issues related to this functionality:
+        // - https://github.com/baoyachi/shadow-rs/issues/184
+        // - https://github.com/baoyachi/shadow-rs/issues/135
+        // - https://github.com/rust-lang/cargo/issues/12195
+        // - https://doc.rust-lang.org/nightly/cargo/reference/unstable.html#lockfile-path
+        if !shadow.deny_contains(CARGO_TREE) {
+            if let Ok(out) = Command::new("cargo").arg("tree").output() {
+                let input = String::from_utf8(out.stdout)?;
+                if let Some(index) = input.find('\n') {
+                    let lines = filter_cargo_tree(
+                        input.get(index..).unwrap_or_default().split('\n').collect(),
+                    );
+                    update_val(CARGO_TREE, lines);
+                }
             }
         }
 
-        if let Ok(out) = Command::new("cargo")
-            .args(["metadata", "--format-version", "1"])
-            .output()
-        {
-            update_val(
-                CARGO_METADATA,
-                String::from_utf8(out.stdout)?.trim().to_string(),
-            );
+        // If the build constant `CARGO_METADATA` is not in the deny list,
+        // See discussions and issues related to this functionality:
+        // - https://github.com/baoyachi/shadow-rs/issues/184
+        // - https://github.com/baoyachi/shadow-rs/issues/135
+        // - https://github.com/rust-lang/cargo/issues/12195
+        // - https://doc.rust-lang.org/nightly/cargo/reference/unstable.html#lockfile-path
+        if !shadow.deny_contains(CARGO_METADATA) {
+            // Attempt to run the `cargo metadata --format-version 1` command.
+            if let Ok(output) = Command::new("cargo")
+                .args(["metadata", "--format-version", "1"])
+                .output()
+            {
+                // If successful, parse the output and update the value associated with `CARGO_METADATA`.
+                update_val(
+                    CARGO_METADATA,
+                    String::from_utf8(output.stdout)?.trim().to_string(),
+                );
+            }
         }
 
         if let Some(v) = std_env.get("TARGET") {
@@ -247,9 +267,7 @@ mod dep_source_replace {
 
 /// Create all `shadow-rs` constants which are determined by the build environment.
 /// The data for these constants is provided by the `std_env` argument.
-pub(crate) fn new_system_env(
-    std_env: &BTreeMap<String, String>,
-) -> BTreeMap<ShadowConst, ConstVal> {
+pub(crate) fn new_system_env(shadow: &Shadow) -> BTreeMap<ShadowConst, ConstVal> {
     let mut env = SystemEnv::default();
     env.map.insert(
         BUILD_OS,
@@ -271,11 +289,6 @@ pub(crate) fn new_system_env(
 
     env.map.insert(CARGO_TREE, ConstVal::new(CARGO_TREE_DOC));
 
-    // env.map.insert(
-    //     CARGO_METADATA,
-    //     ConstVal::new("display build cargo dependencies by metadata.It's use by exec command `cargo metadata`"),
-    // );
-
     env.map
         .insert(BUILD_TARGET, ConstVal::new(BUILD_TARGET_DOC));
 
@@ -298,7 +311,7 @@ pub(crate) fn new_system_env(
     env.map
         .insert(CARGO_MANIFEST_DIR, ConstVal::new(CARGO_MANIFEST_DIR_DOC));
 
-    if let Err(e) = env.init(std_env) {
+    if let Err(e) = env.init(shadow) {
         println!("{e}");
     }
     env.map

src/lib.rs

@@ -319,7 +319,7 @@ pub struct Shadow {
     pub map: BTreeMap<ShadowConst, ConstVal>,
     /// Build environment variables, obtained through [`std::env::vars`].
     pub std_env: BTreeMap<String, String>,
-    /// Constants in the denylist, passed through [`new_deny`] or [`Shadow::build`].
+    /// Constants in the deny list, passed through [`new_deny`] or [`Shadow::build`].
     pub deny_const: BTreeSet<ShadowConst>,
 }
 
@@ -355,6 +355,17 @@ impl Shadow {
         CiType::None
     }
 
+    /// Checks if the specified build constant is in the deny list.
+    ///
+    /// # Arguments
+    /// * `deny_const` - A value of type `ShadowConst` representing the build constant to check.
+    ///
+    /// # Returns
+    /// * `true` if the build constant is present in the deny list; otherwise, `false`.
+    pub fn deny_contains(&self, deny_const: ShadowConst) -> bool {
+        self.deny_const.contains(&deny_const)
+    }
+
     /// Create a new [`Shadow`] configuration with a provided denylist.
     /// The project source path and output file are automatically derived from Cargo build environment variables.
     pub fn build(deny_const: BTreeSet<ShadowConst>) -> SdResult<Shadow> {
@@ -392,7 +403,7 @@ impl Shadow {
         for (k, v) in new_project(&shadow.std_env) {
             map.insert(k, v);
         }
-        for (k, v) in new_system_env(&shadow.std_env) {
+        for (k, v) in new_system_env(&shadow) {
             map.insert(k, v);
         }
         shadow.map = map;