1 files changed, 113 insertions, 0 deletions
diff --git a/build/variables.py b/build/variables.py
new file mode 100644
index 0000000000..ef2d6e6800
--- /dev/null
+++ b/build/variables.py
@@ -0,0 +1,113 @@
+# 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/.
+
+from __future__ import print_function, unicode_literals
+
+import os
+import subprocess
+import sys
+from datetime import datetime
+
+SOURCESTAMP_FILENAME = "sourcestamp.txt"
+
+
+def buildid_header(output):
+    buildid = os.environ.get("MOZ_BUILD_DATE")
+    if buildid and len(buildid) != 14:
+        print("Ignoring invalid MOZ_BUILD_DATE: %s" % buildid, file=sys.stderr)
+        buildid = None
+    if not buildid:
+        buildid = datetime.now().strftime("%Y%m%d%H%M%S")
+    output.write("#define MOZ_BUILDID %s\n" % buildid)
+
+
+def get_program_output(*command):
+    try:
+        with open(os.devnull) as stderr:
+            return subprocess.check_output(
+                command, stderr=stderr, universal_newlines=True
+            )
+    except Exception:
+        return ""
+
+
+def get_hg_info(workdir):
+    repo = get_program_output("hg", "-R", workdir, "path", "default")
+    if repo:
+        repo = repo.strip()
+        if repo.startswith("ssh://"):
+            repo = "https://" + repo[6:]
+        repo = repo.rstrip("/")
+
+    changeset = get_hg_changeset(workdir)
+
+    return repo, changeset
+
+
+def get_hg_changeset(path):
+    return get_program_output("hg", "-R", path, "parent", "--template={node}")
+
+
+def get_info_from_sourcestamp(sourcestamp_path):
+    """Read the repository and changelog information from the sourcestamp
+    file. This assumes that the file exists and returns the results as a list
+    (either strings or None in case of error).
+    """
+
+    # Load the content of the file.
+    lines = None
+    with open(sourcestamp_path) as f:
+        lines = f.read().splitlines()
+
+    # Parse the repo and the changeset. The sourcestamp file is supposed to
+    # contain two lines: the first is the build id and the second is the source
+    # URL.
+    if len(lines) != 2 or not lines[1].startswith("http"):
+        # Just return if the file doesn't contain what we expect.
+        return None, None
+
+    # Return the repo and the changeset.
+    return lines[1].split("/rev/")
+
+
+def source_repo_header(output):
+    # We allow the source repo and changeset to be specified via the
+    # environment (see configure)
+    import buildconfig
+
+    repo = buildconfig.substs.get("MOZ_SOURCE_REPO")
+    changeset = buildconfig.substs.get("MOZ_SOURCE_CHANGESET")
+    source = ""
+
+    if not repo:
+        sourcestamp_path = os.path.join(buildconfig.topsrcdir, SOURCESTAMP_FILENAME)
+        if os.path.exists(os.path.join(buildconfig.topsrcdir, ".hg")):
+            repo, changeset = get_hg_info(buildconfig.topsrcdir)
+        elif os.path.exists(sourcestamp_path):
+            repo, changeset = get_info_from_sourcestamp(sourcestamp_path)
+    elif not changeset:
+        changeset = get_hg_changeset(buildconfig.topsrcdir)
+        if not changeset:
+            raise Exception(
+                "could not resolve changeset; " "try setting MOZ_SOURCE_CHANGESET"
+            )
+
+    if changeset:
+        output.write("#define MOZ_SOURCE_STAMP %s\n" % changeset)
+
+    if repo and buildconfig.substs.get("MOZ_INCLUDE_SOURCE_INFO"):
+        source = "%s/rev/%s" % (repo, changeset)
+        output.write("#define MOZ_SOURCE_REPO %s\n" % repo)
+        output.write("#define MOZ_SOURCE_URL %s\n" % source)
+
+
+def main(args):
+    if len(args):
+        func = globals().get(args[0])
+        if func:
+            return func(sys.stdout, *args[1:])
+
+
+if __name__ == "__main__":
+    sys.exit(main(sys.argv[1:]))