feat(cli): Restore packages from webcs

Cargo.toml

@@ -56,6 +56,7 @@ members = [
     "lib/derive",
     "lib/emscripten",
     "lib/object",
+    "lib/package",
     "lib/registry",
     "lib/sys-utils",
     "lib/types",
@@ -109,6 +110,7 @@ toml = {version = "0.5.9", features = ["preserve_order"]}
 indexmap = "2"
 serde_yaml = "0.9.34"
 libc = { version = "^0.2", default-features = false }
+pretty_assertions = "1.4.0"
 base64 = "0.22.0"
 
 [build-dependencies]

lib/cli/Cargo.toml

@@ -117,6 +117,8 @@ wasmer-compiler-cranelift = { version = "=4.3.7", path = "../compiler-cranelift"
 wasmer-compiler-singlepass = { version = "=4.3.7", path = "../compiler-singlepass", optional = true }
 wasmer-compiler-llvm = { version = "=4.3.7", path = "../compiler-llvm", optional = true }
 wasmer-emscripten = { version = "=4.3.7", path = "../emscripten" }
+wasmer-package = { version = "=0.1.0", path = "../package" }
+
 wasmer-vm = { version = "=4.3.7", path = "../vm", optional = true }
 wasmer-wasix = { path = "../wasix", version = "=0.27.0", features = [
 	"logging",
@@ -276,7 +278,7 @@ unix_mode = "0.1.3"
 [dev-dependencies]
 assert_cmd = "2.0.11"
 predicates = "3.0.3"
-pretty_assertions = "1.3.0"
+pretty_assertions.workspace = true
 
 [target.'cfg(target_os = "windows")'.dependencies]
 colored = "2.0.0"

lib/cli/src/commands/package/unpack.rs

@@ -5,27 +5,53 @@ use dialoguer::console::{style, Emoji};
 use indicatif::ProgressBar;
 
 /// Extract contents of a webc image to a directory.
+///
+/// See --format flag for available output formats.
 #[derive(clap::Parser, Debug)]
 pub struct PackageUnpack {
     /// The output directory.
     #[clap(short = 'o', long)]
-    out_dir: PathBuf,
+    pub out_dir: PathBuf,
 
     /// Overwrite existing directories/files.
     #[clap(long)]
-    overwrite: bool,
+    pub overwrite: bool,
 
     /// Run the unpack command without any output
     #[clap(long)]
     pub quiet: bool,
 
     /// Path to the package.
-    package_path: PathBuf,
+    pub package_path: PathBuf,
+
+    /// Output format.
+    ///
+    /// * package
+    ///   Restore a package directory with a wasmer.toml
+    ///   NOTE: this conversion is lossy, because webcs don't store the original
+    ///   wasmer.toml and the full contents can not be restored.
+    ///
+    /// * webc
+    /// Directly unpack the webc contents.
+    /// - Volumes will be placed in subdirectories.
+    /// - atoms will be placed in the root directory
+    /// - the full webc manifest will be placed in a manifest.json file
+    #[clap(short, long, default_value = "package")]
+    pub format: Format,
 }
 
 static PACKAGE_EMOJI: Emoji<'_, '_> = Emoji("📦 ", "");
 static EXTRACTED_TO_EMOJI: Emoji<'_, '_> = Emoji("📂 ", "");
 
+/// Webc unpack format.
+#[derive(clap::ValueEnum, Clone, Debug)]
+pub enum Format {
+    /// See [`PackageUnpack::format`] for details.
+    Package,
+    /// See [`PackageUnpack::format`] for details.
+    Webc,
+}
+
 impl PackageUnpack {
     pub(crate) fn execute(&self) -> Result<(), anyhow::Error> {
         // Setup the progress bar
@@ -52,8 +78,16 @@ impl PackageUnpack {
         std::fs::create_dir_all(outdir)
             .with_context(|| format!("could not create output directory '{}'", outdir.display()))?;
 
-        pkg.unpack(outdir, self.overwrite)
-            .with_context(|| "could not extract package".to_string())?;
+        match self.format {
+            Format::Package => {
+                wasmer_package::convert::webc_to_package_dir(&pkg, outdir)
+                    .with_context(|| "could not extract package")?;
+            }
+            Format::Webc => {
+                pkg.unpack(outdir, self.overwrite)
+                    .with_context(|| "could not extract package".to_string())?;
+            }
+        }
 
         pb.println(format!(
             "{} {}Extracted package contents to '{}'",
@@ -89,6 +123,7 @@ mod tests {
             overwrite: false,
             package_path,
             quiet: true,
+            format: Format::Webc,
         };
 
         cmd.execute().unwrap();

lib/config/Cargo.toml

@@ -29,6 +29,6 @@ hex = "0.4.3"
 ciborium = "0.2.2"
 
 [dev-dependencies]
-pretty_assertions = "1.4.0"
+pretty_assertions.workspace = true
 serde_json = "1.0.116"
 tempfile = "3.3.0"

lib/config/src/package/mod.rs

@@ -185,6 +185,10 @@ pub struct Package {
 }
 
 impl Package {
+    pub fn new_empty() -> Self {
+        PackageBuilder::default().build().unwrap()
+    }
+
     /// Create a [`PackageBuilder`] populated with all mandatory fields.
     pub fn builder(
         name: impl Into<String>,
@@ -732,6 +736,16 @@ pub struct Manifest {
 }
 
 impl Manifest {
+    pub fn new_empty() -> Self {
+        Self {
+            package: None,
+            dependencies: HashMap::new(),
+            fs: IndexMap::new(),
+            modules: Vec::new(),
+            commands: Vec::new(),
+        }
+    }
+
     /// Create a [`ManifestBuilder`] populated with all mandatory fields.
     pub fn builder(package: Package) -> ManifestBuilder {
         ManifestBuilder::new(package)

lib/package/Cargo.toml

@@ -0,0 +1,21 @@
+[package]
+name = "wasmer-package"
+version = "0.1.0"
+
+authors.workspace = true
+edition.workspace = true
+homepage.workspace = true
+license.workspace = true
+repository.workspace = true
+rust-version.workspace = true
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+webc.workspace = true
+wasmer-config  = { version = "0.8.0", path = "../config" }
+toml = "0.8.0"
+
+[dev-dependencies]
+pretty_assertions.workspace = true
+tempfile = "3.12.0"

lib/package/src/convert/error.rs

@@ -0,0 +1,47 @@
+use std::sync::Arc;
+
+#[derive(Clone, Debug)]
+pub struct ConversionError {
+    message: String,
+    cause: Option<Arc<dyn std::error::Error + Send + Sync>>,
+}
+
+impl ConversionError {
+    pub fn msg(msg: impl Into<String>) -> Self {
+        Self {
+            message: msg.into(),
+            cause: None,
+        }
+    }
+
+    pub fn with_cause(
+        msg: impl Into<String>,
+        cause: impl std::error::Error + Send + Sync + 'static,
+    ) -> Self {
+        Self {
+            message: msg.into(),
+            cause: Some(Arc::new(cause)),
+        }
+    }
+}
+
+impl std::fmt::Display for ConversionError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "could not convert manifest: {}", self.message)?;
+        if let Some(cause) = &self.cause {
+            write!(f, " (cause: {})", cause)?;
+        }
+
+        Ok(())
+    }
+}
+
+impl std::error::Error for ConversionError {
+    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
+        if let Some(e) = &self.cause {
+            Some(e)
+        } else {
+            None
+        }
+    }
+}

lib/package/src/convert/mod.rs

@@ -0,0 +1,4 @@
+mod error;
+mod webc_to_package;
+
+pub use self::{error::ConversionError, webc_to_package::webc_to_package_dir};