Fix double backslashes in printed Windows paths

crates/build/src/lib.rs

@@ -6,7 +6,7 @@ mod manifest;
 
 use anyhow::{anyhow, bail, Context, Result};
 use manifest::ComponentBuildInfo;
-use spin_common::paths::parent_dir;
+use spin_common::{paths::parent_dir, ui::quoted_path};
 use std::{
     collections::HashSet,
     path::{Path, PathBuf},
@@ -19,7 +19,12 @@ use crate::manifest::component_build_configs;
 pub async fn build(manifest_file: &Path, component_ids: &[String]) -> Result<()> {
     let components = component_build_configs(manifest_file)
         .await
-        .with_context(|| format!("Cannot read manifest file from {}", manifest_file.display()))?;
+        .with_context(|| {
+            format!(
+                "Cannot read manifest file from {}",
+                quoted_path(manifest_file)
+            )
+        })?;
     let app_dir = parent_dir(manifest_file)?;
 
     let components_to_build = if component_ids.is_empty() {
@@ -69,7 +74,7 @@ fn build_component(build_info: ComponentBuildInfo, app_dir: &Path) -> Result<()>
             );
             let workdir = construct_workdir(app_dir, b.workdir.as_ref())?;
             if b.workdir.is_some() {
-                println!("Working directory: {:?}", workdir);
+                println!("Working directory: {}", quoted_path(&workdir));
             }
 
             let exit_status = Exec::shell(&b.command)

crates/common/src/lib.rs

@@ -13,4 +13,5 @@ pub mod data_dir;
 pub mod paths;
 pub mod sha256;
 pub mod sloth;
+pub mod ui;
 pub mod url;

crates/common/src/paths.rs

@@ -3,6 +3,8 @@
 use anyhow::{anyhow, Context, Result};
 use std::path::{Path, PathBuf};
 
+use crate::ui::quoted_path;
+
 /// The name given to the default manifest file.
 pub const DEFAULT_MANIFEST_FILE: &str = "spin.toml";
 
@@ -40,7 +42,7 @@ pub fn parent_dir(path: impl AsRef<Path>) -> Result<PathBuf> {
     let path = path.as_ref();
     let mut parent = path
         .parent()
-        .with_context(|| format!("No parent directory for path {path:?}"))?;
+        .with_context(|| format!("No parent directory for path {}", quoted_path(path)))?;
     if parent == Path::new("") {
         parent = Path::new(".");
     }

crates/common/src/ui.rs

@@ -0,0 +1,10 @@
+//! Functions supporting common UI behaviour and standards
+
+use std::path::Path;
+
+/// Renders a Path with double quotes. This is the standard
+/// for displaying paths in Spin. It is preferred to the Debug
+/// format because the latter doubles up backlashes on Windows.
+pub fn quoted_path(path: impl AsRef<Path>) -> impl std::fmt::Display {
+    format!("\"{}\"", path.as_ref().display())
+}

crates/doctor/src/lib.rs

@@ -5,6 +5,7 @@ use std::{collections::VecDeque, fmt::Debug, fs, path::PathBuf};
 
 use anyhow::{ensure, Context, Result};
 use async_trait::async_trait;
+use spin_common::ui::quoted_path;
 use toml_edit::Document;
 
 /// Diagnoses for app manifest format problems.
@@ -88,15 +89,23 @@ impl PatientApp {
         let path = manifest_path.into();
         ensure!(
             path.is_file(),
-            "No Spin app manifest file found at {path:?}"
+            "No Spin app manifest file found at {}",
+            quoted_path(&path),
         );
 
-        let contents = fs::read_to_string(&path)
-            .with_context(|| format!("Couldn't read Spin app manifest file at {path:?}"))?;
-
-        let manifest_doc: Document = contents
-            .parse()
-            .with_context(|| format!("Couldn't parse manifest file at {path:?} as valid TOML"))?;
+        let contents = fs::read_to_string(&path).with_context(|| {
+            format!(
+                "Couldn't read Spin app manifest file at {}",
+                quoted_path(&path)
+            )
+        })?;
+
+        let manifest_doc: Document = contents.parse().with_context(|| {
+            format!(
+                "Couldn't parse manifest file at {} as valid TOML",
+                quoted_path(&path)
+            )
+        })?;
 
         Ok(Self {
             manifest_path: path,

crates/doctor/src/manifest.rs

@@ -2,6 +2,7 @@ use std::fs;
 
 use anyhow::{Context, Result};
 use async_trait::async_trait;
+use spin_common::ui::quoted_path;
 use toml_edit::Document;
 
 use crate::Treatment;
@@ -37,8 +38,9 @@ impl<T: ManifestTreatment + Sync> Treatment for T {
         let after = after_doc.to_string();
         let diff = similar::udiff::unified_diff(Default::default(), &before, &after, 1, None);
         Ok(format!(
-            "Apply the following diff to {:?}:\n{}",
-            patient.manifest_path, diff
+            "Apply the following diff to {}:\n{}",
+            quoted_path(&patient.manifest_path),
+            diff
         ))
     }
 
@@ -47,6 +49,6 @@ impl<T: ManifestTreatment + Sync> Treatment for T {
         self.treat_manifest(doc).await?;
         let path = &patient.manifest_path;
         fs::write(path, doc.to_string())
-            .with_context(|| format!("failed to write fixed manifest to {path:?}"))
+            .with_context(|| format!("failed to write fixed manifest to {}", quoted_path(path)))
     }
 }

crates/doctor/src/manifest/upgrade.rs

@@ -1,5 +1,6 @@
 use anyhow::{anyhow, Context, Result};
 use async_trait::async_trait;
+use spin_common::ui::quoted_path;
 use spin_manifest::{compat::v1_to_v2_app, schema::v1::AppManifestV1, ManifestVersion};
 use toml_edit::{de::from_document, ser::to_document, Item, Table};
 
@@ -97,7 +98,10 @@ impl Treatment for UpgradeDiagnosis {
         let v1_backup_path = patient.manifest_path.with_extension("toml.v1_backup");
         std::fs::rename(&patient.manifest_path, &v1_backup_path)
             .context("failed to back up existing manifest")?;
-        println!("Version 1 manifest backed up to {v1_backup_path:?}.");
+        println!(
+            "Version 1 manifest backed up to {}.",
+            quoted_path(&v1_backup_path)
+        );
 
         // Write new V2 manifest
         std::fs::write(&patient.manifest_path, v2_doc.to_string())

crates/doctor/src/wasm/missing.rs

@@ -2,6 +2,7 @@ use std::process::Command;
 
 use anyhow::{ensure, Context, Result};
 use async_trait::async_trait;
+use spin_common::ui::quoted_path;
 
 use crate::{Diagnosis, PatientApp, Treatment};
 
@@ -52,7 +53,10 @@ impl Diagnosis for WasmMissing {
         let Some(rel_path) = self.0.source_path() else {
             unreachable!("unsupported source");
         };
-        format!("Component {id:?} source {rel_path:?} is missing")
+        format!(
+            "Component {id:?} source {} is missing",
+            quoted_path(rel_path)
+        )
     }
 
     fn treatment(&self) -> Option<&dyn Treatment> {

crates/llm-local/Cargo.toml

@@ -18,6 +18,7 @@ num_cpus = "1"
 rand = "0.8.5"
 safetensors = "0.3.3"
 serde = { version = "1.0.150", features = ["derive"] }
+spin-common = { path = "../common" }
 spin-core = { path = "../core" }
 spin-llm = { path = "../llm" }
 spin-world = { path = "../world" }

crates/llm-local/src/lib.rs

@@ -9,6 +9,7 @@ use llm::{
     ModelArchitecture, ModelKVMemoryType, ModelParameters,
 };
 use rand::SeedableRng;
+use spin_common::ui::quoted_path;
 use spin_core::async_trait;
 use spin_llm::{LlmEngine, MODEL_ALL_MINILM_L6_V2};
 use spin_world::v2::llm::{self as wasi_llm};
@@ -376,14 +377,18 @@ async fn generate_embeddings(
 }
 
 fn load_tokenizer(tokenizer_file: &Path) -> anyhow::Result<tokenizers::Tokenizer> {
-    let tokenizer = tokenizers::Tokenizer::from_file(tokenizer_file)
-        .map_err(|e| anyhow::anyhow!("Failed to read tokenizer file {tokenizer_file:?}: {e}"))?;
+    let tokenizer = tokenizers::Tokenizer::from_file(tokenizer_file).map_err(|e| {
+        anyhow::anyhow!(
+            "Failed to read tokenizer file {}: {e}",
+            quoted_path(tokenizer_file)
+        )
+    })?;
     Ok(tokenizer)
 }
 
 fn load_model(model_file: &Path) -> anyhow::Result<BertModel> {
     let buffer = std::fs::read(model_file)
-        .with_context(|| format!("Failed to read model file {model_file:?}"))?;
+        .with_context(|| format!("Failed to read model file {}", quoted_path(model_file)))?;
     let weights = safetensors::SafeTensors::deserialize(&buffer)?;
     let vb = VarBuilder::from_safetensors(vec![weights], DType::F32, &candle::Device::Cpu);
     let model = BertModel::load(vb, &Config::default()).context("error loading bert model")?;

crates/loader/src/local.rs

@@ -3,7 +3,7 @@ use std::path::{Path, PathBuf};
 use anyhow::{bail, ensure, Context, Result};
 use futures::future::try_join_all;
 use reqwest::Url;
-use spin_common::paths::parent_dir;
+use spin_common::{paths::parent_dir, ui::quoted_path};
 use spin_locked_app::{
     locked::{
         self, ContentPath, ContentRef, LockedApp, LockedComponent, LockedComponentSource,
@@ -47,12 +47,16 @@ impl LocalLoader {
     pub async fn load_file(&self, path: impl AsRef<Path>) -> Result<LockedApp> {
         // Parse manifest
         let path = path.as_ref();
-        let manifest = spin_manifest::manifest_from_file(path)
-            .with_context(|| format!("Failed to read Spin app manifest from {path:?}"))?;
+        let manifest = spin_manifest::manifest_from_file(path).with_context(|| {
+            format!(
+                "Failed to read Spin app manifest from {}",
+                quoted_path(path)
+            )
+        })?;
         let mut locked = self
             .load_manifest(manifest)
             .await
-            .with_context(|| format!("Failed to load Spin app from {path:?}"))?;
+            .with_context(|| format!("Failed to load Spin app from {}", quoted_path(path)))?;
 
         // Set origin metadata
         locked
@@ -286,7 +290,7 @@ impl LocalLoader {
         let src_path = self.app_root.join(src);
         let meta = fs::metadata(&src_path)
             .await
-            .with_context(|| format!("invalid file mount source {src:?}"))?;
+            .with_context(|| format!("invalid file mount source {}", quoted_path(src)))?;
         if meta.is_dir() {
             // { source = "host/dir", destination = "guest/dir" }
             let pattern = src_path.join("**/*");
@@ -359,12 +363,19 @@ impl LocalLoader {
 
         let _loading_permit = self.file_loading_permits.acquire().await?;
         let dest_parent = parent_dir(dest)?;
-        fs::create_dir_all(&dest_parent)
-            .await
-            .with_context(|| format!("Failed to create parent directory {dest_parent:?}"))?;
-        fs::copy(src, dest)
-            .await
-            .with_context(|| format!("Failed to copy {src:?} to {dest:?}"))?;
+        fs::create_dir_all(&dest_parent).await.with_context(|| {
+            format!(
+                "Failed to create parent directory {}",
+                quoted_path(&dest_parent)
+            )
+        })?;
+        fs::copy(src, dest).await.with_context(|| {
+            format!(
+                "Failed to copy {} to {}",
+                quoted_path(src),
+                quoted_path(dest)
+            )
+        })?;
         tracing::debug!("Copied {src:?} to {dest:?}");
         Ok(())
     }

crates/oci/src/auth.rs

@@ -6,6 +6,7 @@ use std::{
 use anyhow::{bail, Context, Result};
 use oci_distribution::secrets::RegistryAuth;
 use serde::{Deserialize, Serialize};
+use spin_common::ui::quoted_path;
 
 #[derive(Serialize, Deserialize)]
 pub struct AuthConfig {
@@ -84,7 +85,7 @@ impl AuthConfig {
     async fn load(p: &Path) -> Result<Self> {
         let contents = tokio::fs::read_to_string(&p).await?;
         serde_json::from_str(&contents)
-            .with_context(|| format!("cannot load authentication file {:?}", p))
+            .with_context(|| format!("cannot load authentication file {}", quoted_path(p)))
     }
 
     async fn save(&self, p: &Path) -> Result<()> {
@@ -95,6 +96,6 @@ impl AuthConfig {
         }
         tokio::fs::write(&p, &serde_json::to_vec_pretty(&self)?)
             .await
-            .with_context(|| format!("cannot save authentication file {:?}", p))
+            .with_context(|| format!("cannot save authentication file {}", quoted_path(p)))
     }
 }

crates/oci/src/client.rs

@@ -12,6 +12,7 @@ use oci_distribution::{
 };
 use reqwest::Url;
 use spin_common::sha256;
+use spin_common::ui::quoted_path;
 use spin_common::url::parse_file_url;
 use spin_loader::cache::Cache;
 use spin_loader::FilesMountStrategy;
@@ -148,11 +149,17 @@ impl Client {
                 if archive_layers {
                     self.push_archive_layer(&source, &mut files, &mut layers)
                         .await
-                        .context(format!("cannot push archive layer for source {:?}", source))?;
+                        .context(format!(
+                            "cannot push archive layer for source {}",
+                            quoted_path(&source)
+                        ))?;
                 } else {
                     self.push_file_layers(&source, &mut files, &mut layers)
                         .await
-                        .context(format!("cannot push file layers for source {:?}", source))?;
+                        .context(format!(
+                            "cannot push file layers for source {}",
+                            quoted_path(&source)
+                        ))?;
                 }
             }
             c.files = files;

crates/oci/src/loader.rs

@@ -3,6 +3,7 @@ use std::path::{Path, PathBuf};
 use anyhow::{anyhow, ensure, Context, Result};
 use oci_distribution::Reference;
 use reqwest::Url;
+use spin_common::ui::quoted_path;
 use spin_loader::cache::Cache;
 use spin_locked_app::locked::{ContentPath, ContentRef, LockedApp, LockedComponent};
 
@@ -46,9 +47,13 @@ impl OciLoader {
     ) -> std::result::Result<LockedApp, anyhow::Error> {
         let locked_content = tokio::fs::read(&lockfile_path)
             .await
-            .with_context(|| format!("failed to read from {lockfile_path:?}"))?;
-        let mut locked_app = LockedApp::from_json(&locked_content)
-            .with_context(|| format!("failed to decode locked app from {lockfile_path:?}"))?;
+            .with_context(|| format!("failed to read from {}", quoted_path(&lockfile_path)))?;
+        let mut locked_app = LockedApp::from_json(&locked_content).with_context(|| {
+            format!(
+                "failed to decode locked app from {}",
+                quoted_path(&lockfile_path)
+            )
+        })?;
 
         // Update origin metadata
         let resolved_reference = Reference::try_from(reference).context("invalid reference")?;
@@ -108,7 +113,10 @@ impl OciLoader {
                     tokio::fs::copy(&content_path, &mount_path)
                         .await
                         .with_context(|| {
-                            format!("failed to copy {content_path:?}->{mount_path:?}")
+                            format!(
+                                "failed to copy {}->{mount_path:?}",
+                                quoted_path(&content_path)
+                            )
                         })?;
                 }
             }