Ensure lockfiles are files

This patch introduces a metadata check for lockfile and manifest paths
to ensure that they're files instead of directories.

Closes #1177.

lockfile/src/cargo.rs

@@ -91,11 +91,11 @@ impl Parse for Cargo {
     }
 
     fn is_path_lockfile(&self, path: &Path) -> bool {
-        path.file_name() == Some(OsStr::new("Cargo.lock"))
+        path.file_name() == Some(OsStr::new("Cargo.lock")) && path.is_file()
     }
 
     fn is_path_manifest(&self, path: &Path) -> bool {
-        path.file_name() == Some(OsStr::new("Cargo.toml"))
+        path.file_name() == Some(OsStr::new("Cargo.toml")) && path.is_file()
     }
 
     #[cfg(feature = "generator")]

lockfile/src/csharp.rs

@@ -47,7 +47,7 @@ impl Parse for PackagesLock {
         };
 
         // Accept both `packages.lock.json` and `packages.<project_name>.lock.json`.
-        file_name.starts_with("packages.") && file_name.ends_with(".lock.json")
+        file_name.starts_with("packages.") && file_name.ends_with(".lock.json") && path.is_file()
     }
 
     fn is_path_manifest(&self, path: &Path) -> bool {

lockfile/src/golang.rs

@@ -22,11 +22,11 @@ impl Parse for GoSum {
     }
 
     fn is_path_lockfile(&self, path: &Path) -> bool {
-        path.file_name() == Some(OsStr::new("go.sum"))
+        path.file_name() == Some(OsStr::new("go.sum")) && path.is_file()
     }
 
     fn is_path_manifest(&self, path: &Path) -> bool {
-        path.file_name() == Some(OsStr::new("go.mod"))
+        path.file_name() == Some(OsStr::new("go.mod")) && path.is_file()
     }
 
     #[cfg(feature = "generator")]

lockfile/src/java.rs

@@ -31,11 +31,11 @@ impl Parse for GradleLock {
     }
 
     fn is_path_lockfile(&self, path: &Path) -> bool {
-        path.file_name() == Some(OsStr::new("gradle.lockfile"))
+        path.file_name() == Some(OsStr::new("gradle.lockfile")) && path.is_file()
     }
 
     fn is_path_manifest(&self, path: &Path) -> bool {
-        path.file_name() == Some(OsStr::new("build.gradle"))
+        path.file_name() == Some(OsStr::new("build.gradle")) && path.is_file()
     }
 
     #[cfg(feature = "generator")]

lockfile/src/javascript.rs

@@ -126,12 +126,13 @@ impl Parse for PackageLock {
 
     fn is_path_lockfile(&self, path: &Path) -> bool {
         let file_name = path.file_name();
-        file_name == Some(OsStr::new("package-lock.json"))
-            || file_name == Some(OsStr::new("npm-shrinkwrap.json"))
+        (file_name == Some(OsStr::new("package-lock.json"))
+            || file_name == Some(OsStr::new("npm-shrinkwrap.json")))
+            && path.is_file()
     }
 
     fn is_path_manifest(&self, path: &Path) -> bool {
-        path.file_name() == Some(OsStr::new("package.json"))
+        path.file_name() == Some(OsStr::new("package.json")) && path.is_file()
     }
 
     #[cfg(feature = "generator")]

lockfile/src/lib.rs

@@ -353,8 +353,14 @@ mod tests {
             (".spdx.yaml", LockfileFormat::Spdx),
         ];
 
+        let dir = tempfile::tempdir().unwrap();
+
         for (file, expected_type) in test_cases {
-            let pkg_type = get_path_format(Path::new(file));
+            // Create file, so we can read its metadata.
+            let path = dir.path().join(file);
+            File::create(&path).unwrap();
+
+            let pkg_type = get_path_format(&path);
             assert_eq!(pkg_type, Some(*expected_type), "{}", file);
         }
     }

lockfile/src/python.rs

@@ -41,14 +41,15 @@ impl Parse for PyRequirements {
     }
 
     fn is_path_lockfile(&self, path: &Path) -> bool {
-        is_requirements_file(path)
+        is_requirements_file(path) && path.is_file()
     }
 
     fn is_path_manifest(&self, path: &Path) -> bool {
-        path.file_name() == Some(OsStr::new("requirements.in"))
+        (path.file_name() == Some(OsStr::new("requirements.in"))
             || path.file_name() == Some(OsStr::new("pyproject.toml"))
             || path.file_name() == Some(OsStr::new("setup.py"))
-            || is_requirements_file(path)
+            || is_requirements_file(path))
+            && path.is_file()
     }
 
     #[cfg(feature = "generator")]

lockfile/src/ruby.rs

@@ -25,11 +25,11 @@ impl Parse for GemLock {
     }
 
     fn is_path_lockfile(&self, path: &Path) -> bool {
-        path.file_name() == Some(OsStr::new("Gemfile.lock"))
+        path.file_name() == Some(OsStr::new("Gemfile.lock")) && path.is_file()
     }
 
     fn is_path_manifest(&self, path: &Path) -> bool {
-        path.file_name() == Some(OsStr::new("Gemfile"))
+        path.file_name() == Some(OsStr::new("Gemfile")) && path.is_file()
     }
 
     #[cfg(feature = "generator")]

lockfile/src/spdx.rs

@@ -192,10 +192,11 @@ impl Parse for Spdx {
     }
 
     fn is_path_lockfile(&self, path: &Path) -> bool {
-        path.ends_with(".spdx.json")
+        (path.ends_with(".spdx.json")
             || path.ends_with(".spdx.yaml")
             || path.ends_with(".spdx.yml")
-            || path.ends_with(".spdx")
+            || path.ends_with(".spdx"))
+            && path.is_file()
     }
 
     fn is_path_manifest(&self, _path: &Path) -> bool {