feat: add gitoxide.core.externalCommandStderr to allow enabling stderr to the enclosing terminal.

Previously, this was enabled by default, now it can additionally be disabled by
the caller.

Author: Byron

gix/src/config/cache/init.rs

@@ -441,6 +441,10 @@ fn apply_environment_overrides(
                     let key = &gitoxide::Core::REFS_NAMESPACE;
                     (env(key), key.name)
                 },
+                {
+                    let key = &gitoxide::Core::EXTERNAL_COMMAND_STDERR;
+                    (env(key), key.name)
+                },
             ],
         ),
         (

gix/src/config/tree/sections/gitoxide.rs

@@ -116,6 +116,15 @@ mod subsections {
         pub const FILTER_PROCESS_DELAY: keys::Boolean =
             keys::Boolean::new_boolean("filterProcessDelay", &Gitoxide::CORE);
 
+        /// The `gitoxide.core.externalCommandStderr` key (default `true`).
+        ///
+        /// If `true`, the default, `stderr` of worktree filter programs, or any other git-context bearing command
+        /// invoked will be inherited.
+        /// If `false`, it will be suppressed completely.
+        pub const EXTERNAL_COMMAND_STDERR: keys::Boolean =
+            keys::Boolean::new_boolean("externalCommandStderr", &Gitoxide::CORE)
+                .with_environment_override("GIX_EXTERNAL_COMMAND_STDERR");
+
         /// The `gitoxide.core.refsNamespace` key.
         pub const REFS_NAMESPACE: RefsNamespace =
             keys::Any::new_with_validate("refsNamespace", &Gitoxide::CORE, super::validate::RefsNamespace)
@@ -134,6 +143,7 @@ mod subsections {
                 &Self::USE_STDEV,
                 &Self::SHALLOW_FILE,
                 &Self::FILTER_PROCESS_DELAY,
+                &Self::EXTERNAL_COMMAND_STDERR,
                 &Self::REFS_NAMESPACE,
             ]
         }

gix/src/repository/config/mod.rs

@@ -88,15 +88,27 @@ impl crate::Repository {
             tree::{gitoxide, Key},
         };
 
-        let boolean = |key: &dyn Key| {
+        let pathspec_boolean = |key: &'static config::tree::keys::Boolean| {
             self.config
                 .resolved
                 .boolean("gitoxide", Some("pathspec".into()), key.name())
+                .map(|value| key.enrich_error(value))
                 .transpose()
                 .with_leniency(self.config.lenient_config)
         };
 
         Ok(gix_command::Context {
+            stderr: {
+                let key = &gitoxide::Core::EXTERNAL_COMMAND_STDERR;
+                self.config
+                    .resolved
+                    .boolean("gitoxide", Some("core".into()), key.name())
+                    .map(|value| key.enrich_error(value))
+                    .transpose()
+                    .with_leniency(self.config.lenient_config)?
+                    .unwrap_or(true)
+                    .into()
+            },
             git_dir: self.git_dir().to_owned().into(),
             worktree_dir: self.work_dir().map(ToOwned::to_owned),
             no_replace_objects: config::shared::is_replace_refs_enabled(
@@ -106,9 +118,10 @@ impl crate::Repository {
             )?
             .map(|enabled| !enabled),
             ref_namespace: self.refs.namespace.as_ref().map(|ns| ns.as_bstr().to_owned()),
-            literal_pathspecs: boolean(&gitoxide::Pathspec::LITERAL)?,
-            glob_pathspecs: boolean(&gitoxide::Pathspec::GLOB)?.or(boolean(&gitoxide::Pathspec::NOGLOB)?),
-            icase_pathspecs: boolean(&gitoxide::Pathspec::ICASE)?,
+            literal_pathspecs: pathspec_boolean(&gitoxide::Pathspec::LITERAL)?,
+            glob_pathspecs: pathspec_boolean(&gitoxide::Pathspec::GLOB)?
+                .or(pathspec_boolean(&gitoxide::Pathspec::NOGLOB)?),
+            icase_pathspecs: pathspec_boolean(&gitoxide::Pathspec::ICASE)?,
         })
     }
 

gix/tests/gix-init.rs

@@ -41,6 +41,7 @@ mod with_overrides {
             .set("GIX_PACK_CACHE_MEMORY", "0")
             .set("GIX_OBJECT_CACHE_MEMORY", "5m")
             .set("GIX_CREDENTIALS_HELPER_STDERR", "creds-stderr")
+            .set("GIX_EXTERNAL_COMMAND_STDERR", "filter-stderr")
             .set("GIT_SSL_CAINFO", "./env.pem")
             .set("GIT_SSL_VERSION", "tlsv1.3")
             .set("GIT_SSH_VARIANT", "ssh-variant-env")
@@ -256,6 +257,7 @@ mod with_overrides {
             ("gitoxide.pathspec.literal", "pathspecs-literal"),
             ("gitoxide.credentials.terminalPrompt", "42"),
             ("gitoxide.credentials.helperStderr", "creds-stderr"),
+            ("gitoxide.core.externalCommandStderr", "filter-stderr"),
         ] {
             assert_eq!(
                 config