Add directory to support installing in a different directory than 'package-name'

src/command.rs

@@ -60,6 +60,7 @@ pub async fn init(kind: Option<PackageType>, name: Option<PackageName>) -> miett
             Ok(PackageManifest {
                 kind,
                 name,
+                directory: None,
                 version: INITIAL_VERSION,
                 description: None,
             })

src/lock.rs

@@ -23,7 +23,7 @@ use url::Url;
 
 use crate::{
     errors::{DeserializationError, FileExistsError, FileNotFound, SerializationError, WriteError},
-    package::{Package, PackageName},
+    package::{Package, PackageDirectory, PackageName},
     registry::RegistryUri,
     ManagedFile,
 };
@@ -41,6 +41,8 @@ pub const LOCKFILE: &str = "Proto.lock";
 pub struct LockedPackage {
     /// The name of the package
     pub name: PackageName,
+    /// Directory where the package's contents are stored
+    pub directory: Option<PackageDirectory>,
     /// The cryptographic digest of the package contents
     pub digest: Digest,
     /// The URI of the registry that contains the package
@@ -67,6 +69,7 @@ impl LockedPackage {
     ) -> Self {
         Self {
             name: package.name().to_owned(),
+            directory: package.directory().cloned(),
             registry,
             repository,
             digest: DigestAlgorithm::SHA256.digest(&package.tgz),

src/manifest.rs

@@ -25,7 +25,7 @@ use tokio::fs;
 
 use crate::{
     errors::{DeserializationError, FileExistsError, SerializationError, WriteError},
-    package::{PackageName, PackageType},
+    package::{PackageDirectory, PackageName, PackageType},
     registry::RegistryUri,
     ManagedFile,
 };
@@ -377,12 +377,23 @@ pub struct PackageManifest {
     pub kind: PackageType,
     /// Name of the package
     pub name: PackageName,
+    /// Directory in which to put the cache. If unset, defaults to the package name
+    pub directory: Option<PackageDirectory>,
     /// Version of the package
     pub version: Version,
     /// Description of the api package
     pub description: Option<String>,
 }
 
+impl PackageManifest {
+    /// Get the directory where the package contents will be stored.
+    ///
+    /// This fallbacks to `name` if `directory` is unset.
+    pub fn directory(&self) -> &str {
+        self.directory.as_deref().unwrap_or(self.name.as_ref())
+    }
+}
+
 /// Represents a single project dependency
 #[derive(Clone, Debug, Hash, Serialize, Deserialize, PartialEq, Eq)]
 pub struct Dependency {

src/package/compressed.rs

@@ -32,6 +32,8 @@ use crate::{
     ManagedFile,
 };
 
+use super::PackageDirectory;
+
 /// An in memory representation of a `buffrs` package
 #[derive(Clone, Debug, PartialEq, Eq)]
 pub struct Package {
@@ -208,6 +210,31 @@ impl Package {
             .name
     }
 
+    /// The directory of this package
+    #[inline]
+    pub fn directory(&self) -> Option<&PackageDirectory> {
+        assert!(self.manifest.package.is_some());
+
+        self.manifest
+            .package
+            .as_ref()
+            .expect("compressed package contains invalid manifest (package section missing)")
+            .directory
+            .as_ref()
+    }
+
+    /// Directory for this oackage
+    #[inline]
+    pub fn directory_str(&self) -> &str {
+        assert!(self.manifest.package.is_some());
+
+        self.manifest
+            .package
+            .as_ref()
+            .expect("compressed package contains invalid manifest (package section missing)")
+            .directory()
+    }
+
     /// The version of this package
     #[inline]
     pub fn version(&self) -> &Version {

src/package/directory.rs

@@ -0,0 +1,172 @@
+// Copyright 2023 Helsing GmbH
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+use std::{fmt, ops::Deref, str::FromStr};
+
+use miette::IntoDiagnostic;
+use serde::{Deserialize, Serialize};
+
+/// A `buffrs` package directory for parsing and type safety
+#[derive(Clone, Hash, Serialize, Deserialize, PartialEq, Eq, PartialOrd, Ord, Debug)]
+#[serde(try_from = "String", into = "String")]
+pub struct PackageDirectory(String);
+
+/// Errors that can be generated parsing [`PackageDirectory`], see [`PackageDirectory::new()`].
+#[derive(thiserror::Error, Debug, PartialEq)]
+pub enum PackageDirectoryError {
+    /// Empty package directory.
+    #[error("package directory must be at least one character long, but was empty")]
+    Empty,
+    /// Too long.
+    #[error("package directories must be at most 128 characters long, but was {0:}")]
+    TooLong(usize),
+    /// Invalid start character.
+    #[error("package directory must start with alphabetic character, but was {0:}")]
+    InvalidStart(char),
+    /// Invalid character.
+    #[error("package directory must consist of only ASCII lowercase and dashes (-, _), but contains {0:} at position {1:}")]
+    InvalidCharacter(char, usize),
+}
+
+impl super::ParseError for PackageDirectoryError {
+    #[inline]
+    fn empty() -> Self {
+        Self::Empty
+    }
+
+    #[inline]
+    fn too_long(current_length: usize) -> Self {
+        Self::TooLong(current_length)
+    }
+
+    #[inline]
+    fn invalid_start(first: char) -> Self {
+        Self::InvalidStart(first)
+    }
+
+    #[inline]
+    fn invalid_character(found: char, pos: usize) -> Self {
+        Self::InvalidCharacter(found, pos)
+    }
+}
+
+impl PackageDirectory {
+    const MAX_LENGTH: usize = 128;
+
+    /// New package directory from string.
+    pub fn new<S: Into<String>>(value: S) -> Result<Self, PackageDirectoryError> {
+        let value = value.into();
+        Self::validate(&value)?;
+        Ok(Self(value))
+    }
+
+    /// Validate a package directory.
+    pub fn validate(directory: impl AsRef<str>) -> Result<(), PackageDirectoryError> {
+        super::validate(directory.as_ref(), &[b'-', b'_'], Self::MAX_LENGTH)
+    }
+}
+
+impl TryFrom<String> for PackageDirectory {
+    type Error = PackageDirectoryError;
+
+    fn try_from(value: String) -> Result<Self, Self::Error> {
+        Self::new(value)
+    }
+}
+
+impl FromStr for PackageDirectory {
+    type Err = miette::Report;
+
+    fn from_str(input: &str) -> Result<Self, Self::Err> {
+        Self::new(input).into_diagnostic()
+    }
+}
+
+impl From<PackageDirectory> for String {
+    fn from(s: PackageDirectory) -> Self {
+        s.to_string()
+    }
+}
+
+impl Deref for PackageDirectory {
+    type Target = str;
+
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+
+impl fmt::Display for PackageDirectory {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.0.fmt(f)
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn ascii_lowercase() {
+        assert_eq!(
+            PackageDirectory::new("abc"),
+            Ok(PackageDirectory("abc".into()))
+        );
+    }
+
+    #[test]
+    fn short() {
+        assert_eq!(PackageDirectory::new("a"), Ok(PackageDirectory("a".into())));
+        assert_eq!(
+            PackageDirectory::new("ab"),
+            Ok(PackageDirectory("ab".into()))
+        );
+    }
+
+    #[test]
+    fn long() {
+        assert_eq!(
+            PackageDirectory::new("a".repeat(PackageDirectory::MAX_LENGTH)),
+            Ok(PackageDirectory("a".repeat(PackageDirectory::MAX_LENGTH)))
+        );
+
+        assert_eq!(
+            PackageDirectory::new("a".repeat(PackageDirectory::MAX_LENGTH + 1)),
+            Err(PackageDirectoryError::TooLong(
+                PackageDirectory::MAX_LENGTH + 1
+            ))
+        );
+    }
+
+    #[test]
+    fn empty() {
+        assert_eq!(PackageDirectory::new(""), Err(PackageDirectoryError::Empty));
+    }
+
+    #[test]
+    fn numeric_start() {
+        assert_eq!(
+            PackageDirectory::new("4abc"),
+            Err(PackageDirectoryError::InvalidStart('4'))
+        );
+    }
+
+    #[test]
+    fn underscore_and_dash() {
+        assert_eq!(
+            PackageDirectory::new("with_underscore-and-dash"),
+            Ok(PackageDirectory("with_underscore-and-dash".into())),
+        );
+    }
+}