[Archery] Crossbow refuses to run on the main branch of a fork #39996
Description
Describe the bug, including details regarding any error messages, version, and platform.
When invoking @github-actions crossbow submit ... on a PR made from a fork's main branch, Archery fails triggering the builds. Example:
#39878 (comment)
Result:
https://github.com/apache/arrow/actions/runs/7828116460/job/21357317509#step:5:18
Run archery trigger-bot \
archery trigger-bot \
--event-name issue_comment \
--event-payload /home/runner/work/_temp/_github_workflow/event.json
shell: /usr/bin/bash -e {0}
env:
pythonLocation: /opt/hostedtoolcache/Python/3.8.18/x64
PKG_CONFIG_PATH: /opt/hostedtoolcache/Python/3.8.18/x64/lib/pkgconfig
Python_ROOT_DIR: /opt/hostedtoolcache/Python/3.8.18/x64
Python2_ROOT_DIR: /opt/hostedtoolcache/Python/3.8.18/x64
Python3_ROOT_DIR: /opt/hostedtoolcache/Python/3.8.18/x64
LD_LIBRARY_PATH: /opt/hostedtoolcache/Python/3.8.18/x64/lib
ARROW_GITHUB_TOKEN: ***
CROSSBOW_GITHUB_TOKEN: ***
fatal: not a git repository (or any of the parent directories): .git
Cloning into '/tmp/tmpze7d9_8y/arrow'...
fatal: refusing to fetch into branch 'refs/heads/main' checked out at '/tmp/tmpze7d9_8y/arrow'
ERROR:archery:Command '['git', '-C', '/tmp/tmpze7d9_8y/arrow', 'fetch', 'origin', 'pull/39878/head:main']' returned non-zero exit status 128.
Component(s)
Archery, Continuous Integration