fix: use default indexes if non where given by the lockfile

src/install_pypi.rs

@@ -4,7 +4,7 @@ use std::{
 
 use distribution_filename::{DistExtension, ExtensionError, SourceDistExtension, WheelFilename};
 use distribution_types::{
-    BuiltDist, CachedDist, Dist, IndexUrl, InstalledDist, Name, RegistryBuiltDist,
+    BuiltDist, CachedDist, Dist, IndexLocations, IndexUrl, InstalledDist, Name, RegistryBuiltDist,
     RegistryBuiltWheel, RegistrySourceDist, SourceDist, UrlString,
 };
 use install_wheel_rs::linker::LinkMode;
@@ -608,7 +608,7 @@ pub async fn update_python_distributions(
 
     let index_locations = pypi_indexes
         .map(|indexes| locked_indexes_to_index_locations(indexes, lock_file_dir))
-        .unwrap()
+        .unwrap_or_else(|| Ok(IndexLocations::default()))
         .into_diagnostic()?;
 
     let registry_client = Arc::new(

src/lib.rs

@@ -1,7 +1,7 @@
 pub mod activation;
 pub mod cli;
 pub(crate) mod conda_pypi_clobber;
-mod environment;
+pub mod environment;
 mod install_pypi;
 mod install_wheel;
 mod lock_file;

tests/install_tests.rs

@@ -1,28 +1,28 @@
 mod common;
 
-use std::{
-    fs::{create_dir_all, File},
-    io::Write,
-    path::{Path, PathBuf},
-    str::FromStr,
+use crate::common::{
+    builders::{string_from_iter, HasDependencyConfig, HasPrefixUpdateConfig},
+    package_database::{Package, PackageDatabase},
 };
-
 use common::{LockFileExt, PixiControl};
 use pixi::cli::cli_config::ProjectConfig;
 use pixi::cli::{run, run::Args, LockFileUsageArgs};
+use pixi::environment::LockFileUsage;
+use pixi::Project;
 use pixi_config::{Config, DetachedEnvironments};
 use pixi_consts::consts;
 use pixi_manifest::FeatureName;
 use rattler_conda_types::Platform;
 use serial_test::serial;
+use std::{
+    fs::{create_dir_all, File},
+    io::Write,
+    path::{Path, PathBuf},
+    str::FromStr,
+};
 use tempfile::TempDir;
 use uv_python::PythonEnvironment;
 
-use crate::common::{
-    builders::{string_from_iter, HasDependencyConfig, HasPrefixUpdateConfig},
-    package_database::{Package, PackageDatabase},
-};
-
 /// Should add a python version to the environment and lock file that matches
 /// the specified version and run it
 #[tokio::test]
@@ -565,3 +565,23 @@ async fn test_installer_name() {
     let installer = std::fs::read_to_string(installer).unwrap();
     assert_eq!(installer, consts::PIXI_UV_INSTALLER);
 }
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+#[serial]
+#[cfg_attr(not(feature = "slow_integration_tests"), ignore)]
+/// Test full prefix install for an old lock file to see if it still works.
+/// Makes sure the lockfile isn't touched and the environment is still installed.
+async fn test_old_lock_install() {
+    let lock_str = std::fs::read_to_string("tests/satisfiability/old_lock_file/pixi.lock").unwrap();
+    let project = Project::from_path(Path::new(
+        "tests/satisfiability/old_lock_file/pyproject.toml",
+    ))
+    .unwrap();
+    pixi::environment::update_prefix(&project.default_environment(), LockFileUsage::Update, false)
+        .await
+        .unwrap();
+    assert_eq!(
+        lock_str,
+        std::fs::read_to_string("tests/satisfiability/old_lock_file/pixi.lock").unwrap()
+    );
+}