create helper fn hex_encode and remove hex dependency

Signed-off-by: onur-ozkan <work@onurozkan.dev>

Author: onur-ozkan

src/bootstrap/Cargo.lock

@@ -55,7 +55,6 @@ dependencies = [
  "cmake",
  "fd-lock",
  "filetime",
- "hex",
  "home",
  "ignore",
  "junction",
@@ -313,12 +312,6 @@ version = "0.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "95505c38b4572b2d910cecb0281560f54b440a19336cbbcb27bf6ce6adc6f5a8"
 
-[[package]]
-name = "hex"
-version = "0.4.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7f24254aa9a54b5c858eaee2f5bccdb46aaf0e486a595ed5fd8f86ba55232a70"
-
 [[package]]
 name = "home"
 version = "0.5.4"

src/bootstrap/Cargo.toml

@@ -39,7 +39,6 @@ clap = { version = "4.4.7", default-features = false, features = ["std", "usage"
 clap_complete = "4.4.3"
 cmake = "0.1.38"
 filetime = "0.2"
-hex = "0.4"
 home = "0.5.4"
 ignore = "0.4.10"
 libc = "0.2.150"

src/bootstrap/src/core/build_steps/setup.rs

@@ -1,6 +1,7 @@
 use crate::core::builder::{Builder, RunConfig, ShouldRun, Step};
 use crate::t;
 use crate::utils::change_tracker::CONFIG_CHANGE_HISTORY;
+use crate::utils::helpers::hex_encode;
 use crate::Config;
 use sha2::Digest;
 use std::env::consts::EXE_SUFFIX;
@@ -566,7 +567,7 @@ fn create_vscode_settings_maybe(config: &Config) -> io::Result<bool> {
     if let Ok(current) = fs::read_to_string(&vscode_settings) {
         let mut hasher = sha2::Sha256::new();
         hasher.update(&current);
-        let hash = hex::encode(hasher.finalize().as_slice());
+        let hash = hex_encode(hasher.finalize().as_slice());
         if hash == *current_hash {
             return Ok(true);
         } else if historical_hashes.contains(&hash.as_str()) {

src/bootstrap/src/core/download.rs

@@ -11,9 +11,9 @@ use std::{
 use build_helper::ci::CiEnv;
 use xz2::bufread::XzDecoder;
 
-use crate::core::build_steps::llvm::detect_llvm_sha;
 use crate::core::config::RustfmtMetadata;
 use crate::utils::helpers::{check_run, exe, program_out_of_date};
+use crate::{core::build_steps::llvm::detect_llvm_sha, utils::helpers::hex_encode};
 use crate::{t, Config};
 
 static SHOULD_FIX_BINS_AND_DYLIBS: OnceLock<bool> = OnceLock::new();
@@ -342,7 +342,7 @@ impl Config {
             reader.consume(l);
         }
 
-        let checksum = hex::encode(hasher.finalize().as_slice());
+        let checksum = hex_encode(hasher.finalize().as_slice());
         let verified = checksum == expected;
 
         if !verified {

src/bootstrap/src/lib.rs

@@ -34,6 +34,7 @@ use filetime::FileTime;
 use sha2::digest::Digest;
 use termcolor::{ColorChoice, StandardStream, WriteColor};
 use utils::channel::GitInfo;
+use utils::helpers::hex_encode;
 
 use crate::core::builder;
 use crate::core::builder::Kind;
@@ -1871,7 +1872,7 @@ pub fn generate_smart_stamp_hash(dir: &Path, additional_input: &str) -> String {
     hasher.update(status);
     hasher.update(additional_input);
 
-    hex::encode(hasher.finalize().as_slice())
+    hex_encode(hasher.finalize().as_slice())
 }
 
 /// Ensures that the behavior dump directory is properly initialized.

src/bootstrap/src/tests/setup.rs

@@ -1,11 +1,12 @@
 use super::{RUST_ANALYZER_SETTINGS, SETTINGS_HASHES};
+use crate::utils::helpers::hex_encode;
 use sha2::Digest;
 
 #[test]
 fn check_matching_settings_hash() {
     let mut hasher = sha2::Sha256::new();
     hasher.update(&RUST_ANALYZER_SETTINGS);
-    let hash = hex::encode(hasher.finalize().as_slice());
+    let hash = hex_encode(hasher.finalize().as_slice());
     assert_eq!(
         &hash,
         SETTINGS_HASHES.last().unwrap(),

src/bootstrap/src/utils/helpers.rs

@@ -548,3 +548,11 @@ pub fn add_rustdoc_cargo_linker_args(
         cmd.env("RUSTDOCFLAGS", flags);
     }
 }
+
+/// Converts `T` into a hexadecimal `String`.
+pub fn hex_encode<T>(input: T) -> String
+where
+    T: AsRef<[u8]>,
+{
+    input.as_ref().iter().map(|x| format!("{:02x}", x)).collect()
+}