feat: prevent pixi init to be executed in parent of pixi home directory

Cargo.toml

@@ -77,6 +77,7 @@ reqwest-middleware = "0.4"
 reqwest-retry = "0.7.0"
 rlimit = "0.10.2"
 rstest = "0.25.0"
+same-file = "1.0.6"
 self-replace = "1.5.0"
 serde = "1.0.218"
 serde-untagged = "0.1.6"
@@ -327,6 +328,7 @@ reqwest = { workspace = true, features = [
 ] }
 reqwest-middleware = { workspace = true }
 rlimit = { workspace = true }
+same-file = { workspace = true }
 self-replace = { workspace = true }
 serde = { workspace = true }
 serde_json = { workspace = true }

src/cli/init.rs

@@ -10,14 +10,15 @@ use std::{
 use clap::{Parser, ValueEnum};
 use miette::{Context, IntoDiagnostic};
 use minijinja::{Environment, context};
-use pixi_config::{Config, get_default_author};
+use pixi_config::{Config, get_default_author, pixi_home};
 use pixi_consts::consts;
 use pixi_manifest::{
     DependencyOverwriteBehavior, FeatureName, SpecType, pyproject::PyProjectManifest,
 };
 use pixi_spec::PixiSpec;
 use pixi_utils::conda_environment_file::CondaEnvFile;
 use rattler_conda_types::{NamedChannelOrUrl, Platform};
+use same_file::is_same_file;
 use tokio::fs::OpenOptions;
 use url::Url;
 use uv_normalize::PackageName;
@@ -255,6 +256,14 @@ pixi.lock merge=binary gitlab-language=yaml gitlab-generated=true
     }
 }
 
+fn is_init_dir_equal_to_pixi_home_parent(init_dir: &Path) -> bool {
+    pixi_home()
+        .as_ref()
+        .and_then(|home_dir| home_dir.parent())
+        .and_then(|parent| is_same_file(parent, init_dir).ok())
+        .unwrap_or(false)
+}
+
 pub async fn execute(args: Args) -> miette::Result<()> {
     let env = Environment::new();
     // Fail silently if the directory already exists or cannot be created.
@@ -267,6 +276,15 @@ pub async fn execute(args: Args) -> miette::Result<()> {
     let gitattributes_path = dir.join(".gitattributes");
     let config = Config::load_global();
 
+    if is_init_dir_equal_to_pixi_home_parent(&dir) {
+        miette::bail!(
+            "You cannot create a workspace in the parent of the pixi home directory.\n\
+            Please see https://pixi.sh/pixi/v{}/reference/environment_variables/ \
+            for more information about the pixi home directory.",
+            consts::PIXI_VERSION
+        );
+    }
+
     // Deprecation warning for the `pyproject` option
     if args.pyproject_toml {
         eprintln!(

tests/integration_python/test_main_cli.py

@@ -404,6 +404,18 @@ def test_pixi_init_non_existing_dir(pixi: Path, tmp_pixi_workspace: Path) -> Non
     assert "[workspace]" in manifest_content
 
 
+def test_pixi_init_pixi_home_parent(pixi: Path, tmp_pixi_workspace: Path) -> None:
+    pixi_home = tmp_pixi_workspace / ".pixi"
+    pixi_home.mkdir(exist_ok=True)
+
+    verify_cli_command(
+        [pixi, "init", pixi_home.parent],
+        ExitCode.FAILURE,
+        stderr_contains="You cannot create a workspace in the parent of the pixi home directory",
+        env={"PIXI_HOME": str(pixi_home)},
+    )
+
+
 @pytest.mark.slow
 def test_pixi_init_pyproject(pixi: Path, tmp_pixi_workspace: Path) -> None:
     manifest_path = tmp_pixi_workspace / "pyproject.toml"