3 files changed, 30 insertions, 22 deletions

diff --git a/cli/npm/cache.rs b/cli/npm/cache.rs
index 4ab39f6bd..e5193c77c 100644
--- a/cli/npm/cache.rs
+++ b/cli/npm/cache.rs
@@ -2,6 +2,7 @@
 
 use std::borrow::Cow;
 use std::fs;
+use std::path::Path;
 use std::path::PathBuf;
 
 use deno_ast::ModuleSpecifier;
@@ -41,23 +42,33 @@ impl Default for ReadonlyNpmCache {
     // This only gets used when creating the tsc runtime and for testing, and so
     // it shouldn't ever actually access the DenoDir, so it doesn't support a
     // custom root.
-    Self::from_deno_dir(&crate::deno_dir::DenoDir::new(None).unwrap()).unwrap()
+    Self::from_deno_dir(&crate::deno_dir::DenoDir::new(None).unwrap())
   }
 }
 
 impl ReadonlyNpmCache {
-  pub fn new(root_dir: PathBuf) -> Result<Self, AnyError> {
-    std::fs::create_dir_all(&root_dir)
-      .with_context(|| format!("Error creating {}", root_dir.display()))?;
-    let root_dir = crate::fs_util::canonicalize_path(&root_dir)?;
+  pub fn new(root_dir: PathBuf) -> Self {
+    fn try_get_canonicalized_root_dir(
+      root_dir: &Path,
+    ) -> Result<PathBuf, AnyError> {
+      if !root_dir.exists() {
+        std::fs::create_dir_all(&root_dir)
+          .with_context(|| format!("Error creating {}", root_dir.display()))?;
+      }
+      Ok(crate::fs_util::canonicalize_path(root_dir)?)
+    }
+
+    // this may fail on readonly file systems, so just ignore if so
+    let root_dir =
+      try_get_canonicalized_root_dir(&root_dir).unwrap_or(root_dir);
     let root_dir_url = Url::from_directory_path(&root_dir).unwrap();
-    Ok(Self {
+    Self {
       root_dir,
       root_dir_url,
-    })
+    }
   }
 
-  pub fn from_deno_dir(dir: &DenoDir) -> Result<Self, AnyError> {
+  pub fn from_deno_dir(dir: &DenoDir) -> Self {
     Self::new(dir.root.join("npm"))
   }
 
@@ -161,14 +172,11 @@ pub struct NpmCache {
 }
 
 impl NpmCache {
-  pub fn from_deno_dir(
-    dir: &DenoDir,
-    cache_setting: CacheSetting,
-  ) -> Result<Self, AnyError> {
-    Ok(Self {
-      readonly: ReadonlyNpmCache::from_deno_dir(dir)?,
+  pub fn from_deno_dir(dir: &DenoDir, cache_setting: CacheSetting) -> Self {
+    Self {
+      readonly: ReadonlyNpmCache::from_deno_dir(dir),
       cache_setting,
-    })
+    }
   }
 
   pub fn as_readonly(&self) -> ReadonlyNpmCache {
@@ -288,7 +296,7 @@ mod test {
   #[test]
   fn should_get_lowercase_package_folder() {
     let root_dir = crate::deno_dir::DenoDir::new(None).unwrap().root;
-    let cache = ReadonlyNpmCache::new(root_dir.clone()).unwrap();
+    let cache = ReadonlyNpmCache::new(root_dir.clone());
     let registry_url = Url::parse("https://registry.npmjs.org/").unwrap();
 
     // all lowercase should be as-is
@@ -311,7 +319,7 @@ mod test {
   fn should_handle_non_all_lowercase_package_names() {
     // it was possible at one point for npm packages to not just be lowercase
     let root_dir = crate::deno_dir::DenoDir::new(None).unwrap().root;
-    let cache = ReadonlyNpmCache::new(root_dir.clone()).unwrap();
+    let cache = ReadonlyNpmCache::new(root_dir.clone());
     let registry_url = Url::parse("https://registry.npmjs.org/").unwrap();
     let json_uppercase_hash =
       "db1a21a0bc2ef8fbe13ac4cf044e8c9116d29137d5ed8b916ab63dcb2d4290df";
diff --git a/cli/npm/mod.rs b/cli/npm/mod.rs
index 7bb515e9e..5b49afb3d 100644
--- a/cli/npm/mod.rs
+++ b/cli/npm/mod.rs
@@ -85,13 +85,13 @@ impl GlobalNpmPackageResolver {
     reload: bool,
     cache_setting: CacheSetting,
     unstable: bool,
-  ) -> Result<Self, AnyError> {
-    Ok(Self::from_cache(
-      NpmCache::from_deno_dir(dir, cache_setting.clone())?,
+  ) -> Self {
+    Self::from_cache(
+      NpmCache::from_deno_dir(dir, cache_setting.clone()),
       reload,
       cache_setting,
       unstable,
-    ))
+    )
   }
 
   fn from_cache(
diff --git a/cli/proc_state.rs b/cli/proc_state.rs
index 7175f18e1..42c34686f 100644
--- a/cli/proc_state.rs
+++ b/cli/proc_state.rs
@@ -229,7 +229,7 @@ impl ProcState {
       cli_options.unstable()
         // don't do the unstable error when in the lsp
         || matches!(cli_options.sub_command(), DenoSubcommand::Lsp),
-    )?;
+    );
 
     Ok(ProcState(Arc::new(Inner {
       dir,