fix: merge purls from matching records in lock-file

crates/rattler_lock/src/builder.rs

@@ -1,14 +1,15 @@
 //! Builder for the creation of lock files.
 
 use std::{
+    borrow::Cow,
     collections::{BTreeSet, HashMap},
     sync::Arc,
 };
 
 use fxhash::FxHashMap;
 use indexmap::{IndexMap, IndexSet};
 use pep508_rs::ExtraName;
-use rattler_conda_types::Platform;
+use rattler_conda_types::{Platform, Version};
 
 use crate::{
     file_format_version::FileFormatVersion, Channel, CondaBinaryData, CondaPackageData,
@@ -118,11 +119,34 @@ pub struct LockFileBuilder {
     environments: IndexMap<String, EnvironmentData>,
 
     /// A list of all package metadata stored in the lock file.
-    conda_packages: IndexSet<CondaPackageData>,
+    conda_packages: IndexMap<UniqueCondaIdentifier, CondaPackageData>,
     pypi_packages: IndexSet<PypiPackageData>,
     pypi_runtime_configurations: IndexSet<HashablePypiPackageEnvironmentData>,
 }
 
+/// A unique identifier for a conda package. This is used to deduplicate
+/// packages. This only includes the unique identifying aspects of a package.
+#[derive(Debug, Hash, Eq, PartialEq)]
+struct UniqueCondaIdentifier {
+    location: UrlOrPath,
+    normalized_name: String,
+    version: Version,
+    build: String,
+    subdir: String,
+}
+
+impl<'a> From<&'a CondaPackageData> for UniqueCondaIdentifier {
+    fn from(value: &'a CondaPackageData) -> Self {
+        Self {
+            location: value.location().clone(),
+            normalized_name: value.record().name.as_normalized().to_string(),
+            version: value.record().version.version().clone(),
+            build: value.record().build.clone(),
+            subdir: value.record().subdir.clone(),
+        }
+    }
+}
+
 impl LockFileBuilder {
     /// Generate a new lock file using the builder pattern
     pub fn new() -> Self {
@@ -184,15 +208,25 @@ impl LockFileBuilder {
                 indexes: None,
             });
 
+        let unique_identifier = UniqueCondaIdentifier::from(&locked_package);
+
         // Add the package to the list of packages.
-        let package_idx = self.conda_packages.insert_full(locked_package).0;
+        let entry = self.conda_packages.entry(unique_identifier);
+        let package_idx = entry.index();
+        entry
+            .and_modify(|pkg| {
+                if let Cow::Owned(merged_package) = pkg.merge(&locked_package) {
+                    *pkg = merged_package;
+                }
+            })
+            .or_insert(locked_package);
 
         // Add the package to the environment that it is intended for.
         environment
             .packages
             .entry(platform)
             .or_default()
-            .push(EnvironmentPackageData::Conda(package_idx));
+            .insert(EnvironmentPackageData::Conda(package_idx));
 
         self
     }
@@ -231,7 +265,7 @@ impl LockFileBuilder {
             .packages
             .entry(platform)
             .or_default()
-            .push(EnvironmentPackageData::Pypi(package_idx, runtime_idx));
+            .insert(EnvironmentPackageData::Pypi(package_idx, runtime_idx));
 
         self
     }
@@ -327,7 +361,7 @@ impl LockFileBuilder {
         LockFile {
             inner: Arc::new(LockFileInner {
                 version: FileFormatVersion::LATEST,
-                conda_packages: self.conda_packages.into_iter().collect(),
+                conda_packages: self.conda_packages.into_values().collect(),
                 pypi_packages: self.pypi_packages.into_iter().collect(),
                 pypi_environment_package_data: self
                     .pypi_runtime_configurations
@@ -362,3 +396,83 @@ impl From<PypiPackageEnvironmentData> for HashablePypiPackageEnvironmentData {
         }
     }
 }
+
+#[cfg(test)]
+mod test {
+    use std::str::FromStr;
+
+    use rattler_conda_types::{PackageName, PackageRecord, Platform, Version};
+    use url::Url;
+
+    use crate::{CondaBinaryData, LockFile};
+
+    #[test]
+    fn test_merge_records_and_purls() {
+        let record = PackageRecord {
+            subdir: "linux-64".into(),
+            ..PackageRecord::new(
+                PackageName::new_unchecked("foobar"),
+                Version::from_str("1.0.0").unwrap(),
+                "build".into(),
+            )
+        };
+
+        let record_with_purls = PackageRecord {
+            purls: Some(
+                ["pkg:pypi/foobar@1.0.0".parse().unwrap()]
+                    .into_iter()
+                    .collect(),
+            ),
+            ..record.clone()
+        };
+
+        let lock_file = LockFile::builder()
+            .with_conda_package(
+                "default",
+                Platform::Linux64,
+                CondaBinaryData {
+                    package_record: record.clone(),
+                    location: Url::parse(
+                        "https://prefix.dev/example/linux-64/foobar-1.0.0-build.tar.bz2",
+                    )
+                    .unwrap()
+                    .into(),
+                    file_name: "foobar-1.0.0-build.tar.bz2".to_string(),
+                    channel: None,
+                }
+                .into(),
+            )
+            .with_conda_package(
+                "default",
+                Platform::Linux64,
+                CondaBinaryData {
+                    package_record: record.clone(),
+                    location: Url::parse(
+                        "https://prefix.dev/example/linux-64/foobar-1.0.0-build.tar.bz2",
+                    )
+                    .unwrap()
+                    .into(),
+                    file_name: "foobar-1.0.0-build.tar.bz2".to_string(),
+                    channel: None,
+                }
+                .into(),
+            )
+            .with_conda_package(
+                "foobar",
+                Platform::Linux64,
+                CondaBinaryData {
+                    package_record: record_with_purls,
+                    location: Url::parse(
+                        "https://prefix.dev/example/linux-64/foobar-1.0.0-build.tar.bz2",
+                    )
+                    .unwrap()
+                    .into(),
+                    file_name: "foobar-1.0.0-build.tar.bz2".to_string(),
+                    channel: None,
+                }
+                .into(),
+            )
+            .finish();
+        insta::assert_snapshot!(lock_file.render_to_string().unwrap());
+    }
+}

crates/rattler_lock/src/conda.rs

@@ -1,4 +1,4 @@
-use std::{cmp::Ordering, hash::Hash};
+use std::{borrow::Cow, cmp::Ordering, hash::Hash};
 
 use rattler_conda_types::{
     ChannelUrl, MatchSpec, Matches, NamelessMatchSpec, PackageRecord, RepoDataRecord,
@@ -78,6 +78,27 @@ impl CondaPackageData {
             Self::Source(data) => Some(data),
         }
     }
+
+    /// Performs the best effort merge of two conda packages.
+    /// Some fields in the packages are optional, if one of the packages
+    /// contain an optional field they are merged.
+    pub(crate) fn merge(&self, other: &Self) -> Cow<'_, Self> {
+        match (self, other) {
+            (CondaPackageData::Binary(left), CondaPackageData::Binary(right)) => {
+                if let Cow::Owned(merged) = left.merge(right) {
+                    return Cow::Owned(merged.into());
+                }
+            }
+            (CondaPackageData::Source(left), CondaPackageData::Source(right)) => {
+                if let Cow::Owned(merged) = left.merge(right) {
+                    return Cow::Owned(merged.into());
+                }
+            }
+            _ => {}
+        }
+
+        Cow::Borrowed(self)
+    }
 }
 
 /// Information about a binary conda package stored in the lock-file.
@@ -102,6 +123,23 @@ impl From<CondaBinaryData> for CondaPackageData {
     }
 }
 
+impl CondaBinaryData {
+    pub(crate) fn merge(&self, other: &Self) -> Cow<'_, Self> {
+        if self.location == other.location {
+            if let Cow::Owned(merged) =
+                merge_package_record(&self.package_record, &other.package_record)
+            {
+                return Cow::Owned(Self {
+                    package_record: merged,
+                    ..self.clone()
+                });
+            }
+        }
+
+        Cow::Borrowed(self)
+    }
+}
+
 /// Information about a source package stored in the lock-file.
 #[derive(Clone, Debug, PartialEq, Eq, Hash)]
 pub struct CondaSourceData {
@@ -121,6 +159,23 @@ impl From<CondaSourceData> for CondaPackageData {
     }
 }
 
+impl CondaSourceData {
+    pub(crate) fn merge(&self, other: &Self) -> Cow<'_, Self> {
+        if self.location == other.location {
+            if let Cow::Owned(merged) =
+                merge_package_record(&self.package_record, &other.package_record)
+            {
+                return Cow::Owned(Self {
+                    package_record: merged,
+                    ..self.clone()
+                });
+            }
+        }
+
+        Cow::Borrowed(self)
+    }
+}
+
 /// A record of input files that were used to define the metadata of the
 /// package.
 #[derive(Clone, Debug, PartialEq, Eq, Hash)]
@@ -270,3 +325,43 @@ impl Matches<NamelessMatchSpec> for CondaPackageData {
         spec.matches(self.record())
     }
 }
+
+fn merge_package_record<'a>(
+    left: &'a PackageRecord,
+    right: &PackageRecord,
+) -> Cow<'a, PackageRecord> {
+    let mut result = Cow::Borrowed(left);
+
+    // If the left package doesn't contain purls we merge those from the right one.
+    if left.purls.is_none() && right.purls.is_some() {
+        result = Cow::Owned(PackageRecord {
+            purls: right.purls.clone(),
+            ..result.into_owned()
+        });
+    }
+
+    // If the left package doesn't contain run_exports we merge those from the right
+    // one.
+    if left.run_exports.is_none() && right.run_exports.is_some() {
+        result = Cow::Owned(PackageRecord {
+            run_exports: right.run_exports.clone(),
+            ..result.into_owned()
+        });
+    }
+
+    // Merge hashes if the left package doesn't contain them.
+    if left.md5.is_none() && right.md5.is_some() {
+        result = Cow::Owned(PackageRecord {
+            md5: right.md5,
+            ..result.into_owned()
+        });
+    }
+    if left.sha256.is_none() && right.sha256.is_some() {
+        result = Cow::Owned(PackageRecord {
+            sha256: right.sha256,
+            ..result.into_owned()
+        });
+    }
+
+    result
+}

crates/rattler_lock/src/lib.rs

@@ -79,6 +79,7 @@
 use std::{collections::HashMap, io::Read, path::Path, str::FromStr, sync::Arc};
 
 use fxhash::FxHashMap;
+use indexmap::IndexSet;
 use rattler_conda_types::{Platform, RepoDataRecord};
 
 mod builder;
@@ -136,7 +137,7 @@ struct LockFileInner {
 /// enum and might contain additional data that is specific to the environment.
 /// For instance different environments might select the same Pypi package but
 /// with different extras.
-#[derive(Clone, Copy, Debug)]
+#[derive(Clone, Copy, Debug, Hash, Eq, PartialEq)]
 enum EnvironmentPackageData {
     Conda(usize),
     Pypi(usize, usize),
@@ -158,7 +159,7 @@ struct EnvironmentData {
 
     /// For each individual platform this environment supports we store the
     /// package identifiers associated with the environment.
-    packages: FxHashMap<Platform, Vec<EnvironmentPackageData>>,
+    packages: FxHashMap<Platform, IndexSet<EnvironmentPackageData>>,
 }
 
 impl LockFile {
@@ -532,6 +533,7 @@ mod test {
     #[case::v4_pypi_path("v4/path-based-lock.yml")]
     #[case::v4_pypi_absolute_path("v4/absolute-path-lock.yml")]
     #[case::v5_pypi_flat_index("v5/flat-index-lock.yml")]
+    #[case::v5_with_and_without_purl("v5/similar-with-and-without-purl.yml")]
     #[case::v6_conda_source_path("v6/conda-path-lock.yml")]
     #[case::v6_derived_channel("v6/derived-channel-lock.yml")]
     fn test_parse(#[case] file_name: &str) {