ci: update token retrieval method for gantt charts

When the gantt chart service was first implemented, the read_token()
function would attempt to read from the default token file if the token
argument was missing.

Now it's necessary to call a separate function to look in the default
token file, so if the token argument is not provided, expressly call
get_token_from_default_dir().

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32637>

bin/ci/ci_gantt_chart.py

@@ -16,7 +16,8 @@ import plotly.graph_objs as go
 from gitlab import Gitlab, base
 from gitlab.v4.objects import ProjectPipeline
 from gitlab_common import (GITLAB_URL, get_gitlab_pipeline_from_url,
-                           pretty_duration, read_token)
+                           get_token_from_default_dir, pretty_duration,
+                           read_token)
 
 
 def calculate_queued_at(job) -> datetime:
@@ -157,6 +158,9 @@ def main(
     output: str | None,
     ci_timeout: float = 60,
 ):
+    if token is None:
+        token = get_token_from_default_dir()
+
     token = read_token(token)
     gl = Gitlab(url=GITLAB_URL, private_token=token, retry_transient_errors=True)
 

bin/ci/ci_post_gantt.py

@@ -21,7 +21,8 @@ from ci_gantt_chart import generate_gantt_chart
 from gitlab import Gitlab
 from gitlab.base import RESTObject
 from gitlab.v4.objects import Project, ProjectPipeline
-from gitlab_common import GITLAB_URL, get_gitlab_pipeline_from_url, read_token
+from gitlab_common import (GITLAB_URL, get_gitlab_pipeline_from_url,
+                           get_token_from_default_dir, read_token)
 
 
 class MockGanttExit(Exception):
@@ -115,6 +116,9 @@ def main(
     ci_timeout: float = 60,
 ):
     log.basicConfig(level=log.INFO)
+    if token is None:
+        token = get_token_from_default_dir()
+
     token = read_token(token)
     gl = Gitlab(url=GITLAB_URL, private_token=token, retry_transient_errors=True)