From 2ddf85492ff5d5806e63a46286ee0e3603042c02 Mon Sep 17 00:00:00 2001
From: David Sherret <dsherret@users.noreply.github.com>
Date: Thu, 25 May 2023 15:29:58 -0400
Subject: fix(compile): improve panic message when stripping root path fails
 (#19258)

I'm not sure what's going on here, so this will help us debug.

For #19251
---
 cli/standalone/virtual_fs.rs | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/cli/standalone/virtual_fs.rs b/cli/standalone/virtual_fs.rs
index 31f630db8..e94758bd9 100644
--- a/cli/standalone/virtual_fs.rs
+++ b/cli/standalone/virtual_fs.rs
@@ -84,7 +84,7 @@ impl VfsBuilder {
   }
 
   pub fn add_dir(&mut self, path: &Path) -> &mut VirtualDirectory {
-    let path = path.strip_prefix(&self.root_path).unwrap();
+    let path = self.path_relative_root(path);
     let mut current_dir = &mut self.root_dir;
 
     for component in path.components() {
@@ -151,7 +151,7 @@ impl VfsBuilder {
   }
 
   pub fn add_symlink(&mut self, path: &Path, target: &Path) {
-    let dest = target.strip_prefix(&self.root_path).unwrap().to_path_buf();
+    let dest = self.path_relative_root(target);
     let dir = self.add_dir(path.parent().unwrap());
     let name = path.file_name().unwrap().to_string_lossy();
     match dir.entries.binary_search_by(|e| e.name().cmp(&name)) {
@@ -174,6 +174,20 @@ impl VfsBuilder {
   pub fn into_dir_and_files(self) -> (VirtualDirectory, Vec<Vec<u8>>) {
     (self.root_dir, self.files)
   }
+
+  fn path_relative_root(&self, path: &Path) -> PathBuf {
+    match path.strip_prefix(&self.root_path) {
+      Ok(p) => p.to_path_buf(),
+      Err(err) => {
+        panic!(
+          "Failed to strip prefix '{}' from '{}': {:#}",
+          self.root_path.display(),
+          path.display(),
+          err
+        )
+      }
+    }
+  }
 }
 
 #[derive(Debug)]
-- 
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