Merge pull request #1825 from DianaNites/diananites-reftable

Add reftable test and archive

Author: Byron

gix-discover/src/is.rs

@@ -1,6 +1,5 @@
-use std::{borrow::Cow, ffi::OsStr, path::Path};
-
 use crate::{DOT_GIT_DIR, MODULES};
+use std::{borrow::Cow, ffi::OsStr, path::Path};
 
 /// Returns true if the given `git_dir` seems to be a bare repository.
 ///
@@ -67,21 +66,30 @@ pub(crate) fn git_with_metadata(
 
     {
         // Fast-path: avoid doing the complete search if HEAD is already not there.
-        // TODO(reftable): use a ref-store to lookup HEAD if ref-tables should be supported, or detect ref-tables beforehand.
-        //                 Actually ref-tables still keep a specially marked `HEAD` around, so nothing might be needed here
-        //                 Even though our head-check later would fail without supporting it.
         if !dot_git.join("HEAD").exists() {
             return Err(crate::is_git::Error::MissingHead);
         }
         // We expect to be able to parse any ref-hash, so we shouldn't have to know the repos hash here.
-        // With ref-table, the has is probably stored as part of the ref-db itself, so we can handle it from there.
+        // With ref-table, the hash is probably stored as part of the ref-db itself, so we can handle it from there.
         // In other words, it's important not to fail on detached heads here because we guessed the hash kind wrongly.
         let refs = gix_ref::file::Store::at(dot_git.as_ref().into(), Default::default());
-        let head = refs.find_loose("HEAD")?;
-        if head.name.as_bstr() != "HEAD" {
-            return Err(crate::is_git::Error::MisplacedHead {
-                name: head.name.into_inner(),
-            });
+        match refs.find_loose("HEAD") {
+            Ok(head) => {
+                if head.name.as_bstr() != "HEAD" {
+                    return Err(crate::is_git::Error::MisplacedHead {
+                        name: head.name.into_inner(),
+                    });
+                }
+            }
+            Err(gix_ref::file::find::existing::Error::Find(gix_ref::file::find::Error::ReferenceCreation {
+                source: _,
+                relative_path,
+            })) if relative_path == Path::new("HEAD") => {
+                // It's fine as long as the reference is found is `HEAD`.
+            }
+            Err(err) => {
+                return Err(err.into());
+            }
         }
     }
 

gix-discover/tests/discover/is_git/mod.rs renamed to gix-discover/tests/discover/is_git.rs

@@ -130,3 +130,18 @@ fn split_worktree_using_configuration() -> crate::Result {
     }
     Ok(())
 }
+
+#[test]
+fn reftable() -> crate::Result {
+    let repo_path = match gix_testtools::scripted_fixture_read_only("make_reftable_repo.sh") {
+        Ok(root) => root.join("reftable-clone/.git"),
+        Err(_) if *gix_testtools::GIT_VERSION < (2, 44, 0) => {
+            eprintln!("Fixture script failure ignored as it looks like Git isn't recent enough.");
+            return Ok(());
+        }
+        Err(err) => panic!("{err}"),
+    };
+    let kind = gix_discover::is_git(&repo_path)?;
+    assert_eq!(kind, gix_discover::repository::Kind::WorkTree { linked_git_dir: None });
+    Ok(())
+}

gix-discover/tests/discover/parse/mod.rs renamed to gix-discover/tests/discover/parse.rs

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+set -eu -o pipefail
+
+git init -q
+
+git checkout -b main
+touch this
+git add this
+git commit -q -m c1
+echo hello >> this
+git commit -q -am c2
+
+git clone --ref-format=reftable . reftable-clone

gix-discover/tests/discover/path/mod.rs renamed to gix-discover/tests/discover/path.rs

@@ -77,10 +77,10 @@ pub struct Stack {
 }
 
 #[cfg(unix)]
-/// Returns whether a a file has the executable permission set.
+/// Returns whether a file has the executable permission set.
 pub fn is_executable(metadata: &std::fs::Metadata) -> bool {
     use std::os::unix::fs::MetadataExt;
-    (metadata.mode() & 0o100) != 0
+    (metadata.mode() & 0o111) != 0
 }
 
 /// Classifiers for IO-errors.

gix-discover/tests/fixtures/generated-archives/make_reftable_repo.tar

@@ -20,6 +20,8 @@ pub mod component {
         DotGitDir,
         #[error("The .gitmodules file must not be a symlink")]
         SymlinkedGitModules,
+        #[error("Relative components '.' and '..' are disallowed")]
+        Relative,
     }
 
     /// Further specify what to check for in [`component()`](super::component())
@@ -78,6 +80,9 @@ pub fn component(
     if input.is_empty() {
         return Err(component::Error::Empty);
     }
+    if input == ".." || input == "." {
+        return Err(component::Error::Relative);
+    }
     if protect_windows {
         if input.find_byteset(br"/\").is_some() {
             return Err(component::Error::PathSeparator);

gix-discover/tests/fixtures/make_reftable_repo.sh

@@ -253,6 +253,10 @@ mod component {
         mktest!(con_with_extension, b"CON.abc", Error::WindowsReservedName);
         mktest!(con_with_middle, b"CON.tar.xz", Error::WindowsReservedName);
         mktest!(con_mixed_with_middle, b"coN.tar.xz ", Error::WindowsReservedName);
+        mktest!(dot_dot, b"..", Error::Relative);
+        mktest!(dot_dot_no_opts, b"..", Error::Relative, NO_OPTS);
+        mktest!(single_dot, b".", Error::Relative);
+        mktest!(single_dot_no_opts, b".", Error::Relative, NO_OPTS);
         mktest!(
             conout_mixed_with_extension,
             b"ConOut$  .xyz",