1 files changed, 64 insertions, 0 deletions
diff --git a/third_party/python/taskcluster_taskgraph/taskgraph/util/treeherder.py b/third_party/python/taskcluster_taskgraph/taskgraph/util/treeherder.py
new file mode 100644
index 0000000000..9d0c032a1b
--- /dev/null
+++ b/third_party/python/taskcluster_taskgraph/taskgraph/util/treeherder.py
@@ -0,0 +1,64 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import re
+
+_JOINED_SYMBOL_RE = re.compile(r"([^(]*)\(([^)]*)\)$")
+
+
+def split_symbol(treeherder_symbol):
+    """Split a symbol expressed as grp(sym) into its two parts.  If no group is
+    given, the returned group is '?'"""
+    groupSymbol = "?"
+    symbol = treeherder_symbol
+    if "(" in symbol:
+        match = _JOINED_SYMBOL_RE.match(symbol)
+        if match:
+            groupSymbol, symbol = match.groups()
+        else:
+            raise Exception(f"`{symbol}` is not a valid treeherder symbol.")
+    return groupSymbol, symbol
+
+
+def join_symbol(group, symbol):
+    """Perform the reverse of split_symbol, combining the given group and
+    symbol.  If the group is '?', then it is omitted."""
+    if group == "?":
+        return symbol
+    return f"{group}({symbol})"
+
+
+def add_suffix(treeherder_symbol, suffix):
+    """Add a suffix to a treeherder symbol that may contain a group."""
+    group, symbol = split_symbol(treeherder_symbol)
+    symbol += str(suffix)
+    return join_symbol(group, symbol)
+
+
+def replace_group(treeherder_symbol, new_group):
+    """Add a suffix to a treeherder symbol that may contain a group."""
+    _, symbol = split_symbol(treeherder_symbol)
+    return join_symbol(new_group, symbol)
+
+
+def inherit_treeherder_from_dep(job, dep_job):
+    """Inherit treeherder defaults from dep_job"""
+    treeherder = job.get("treeherder", {})
+
+    dep_th_platform = (
+        dep_job.task.get("extra", {})
+        .get("treeherder", {})
+        .get("machine", {})
+        .get("platform", "")
+    )
+    dep_th_collection = list(
+        dep_job.task.get("extra", {}).get("treeherder", {}).get("collection", {}).keys()
+    )[0]
+    treeherder.setdefault("platform", f"{dep_th_platform}/{dep_th_collection}")
+    treeherder.setdefault(
+        "tier", dep_job.task.get("extra", {}).get("treeherder", {}).get("tier", 1)
+    )
+    # Does not set symbol
+    treeherder.setdefault("kind", "build")
+    return treeherder