nanonyme commented on code in PR #62:
URL: 
https://github.com/apache/buildstream-plugins/pull/62#discussion_r1529220840


##########
src/buildstream_plugins/sources/cargo.py:
##########
@@ -294,6 +308,166 @@ def _get_mirror_file(self, sha=None):
         return os.path.join(self._get_mirror_dir(), sha or self.sha)
 
 
+# Locks on repositories for write access
+REPO_LOCKS = {}
+
+
+# CrateGit()
+#
+# Use a SourceFetcher class to be the per crate helper.
+#
+# This one is for crates fetched from git repositories.
+#
+# Args:
+#    cargo (Cargo): The main Source implementation
+#    name (str): The name of the crate to depend on
+#    version (str): The version of the crate to depend on
+#    repo (str): Repository URL
+#    commit (str): Sha of the git commit
+class CrateGit(SourceFetcher):
+    def __init__(self, cargo, name, version, repo, commit):
+        super().__init__()
+
+        self.cargo = cargo
+        self.name = name
+        self.version = str(version)
+        self.repo = repo
+        self.commit = commit
+        # TODO: Is this right?
+        self.mark_download_url(self.repo)

Review Comment:
   @sophie-h if you want to look at real-world example, 
https://gitlab.gnome.org/GNOME/gnome-build-meta/-/blob/master/include/aliases.yml#L12
 -> 
https://gitlab.gnome.org/GNOME/gnome-build-meta/-/blob/master/include/mirrors.yml#L10.
 You as plugin author only need to provide ability to provide aliased URL's. 
BuildStream expands aliases based on user (or project) configuration and this 
may include mirrors. freedesktop-sdk and gnome attempt to mirror everything 
through lorry.



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