feat: write changed files to file not env (IN-1254)

[theProf]

TL;DR

Replaces the CHANGED_FILES environment variable (which stored file contents inline) with CHANGED_FILES_FILE, a path to a file containing the list of changed files.

What changed?

The get_changed_files command no longer stores the git diff output in a CHANGED_FILES environment variable. Instead, it writes the output directly to a file (defaulting to /tmp/changed_files.txt) and exports CHANGED_FILES_FILE pointing to that path. All consumers (set-if-file-changed, set-service-data-json, and get_modified_charts.sh) have been updated to read from the file path rather than the inline environment variable.

How to test?

Run a pipeline that uses the get_changed_files command followed by any of the dependent commands (set-if-file-changed, set-service-data-json, or helm chart detection). Verify that changed files are correctly detected and the appropriate environment variables are set as expected.

Why make this change?

Storing large amounts of file change data inline in an environment variable is fragile — it can break with special characters, newlines, or when the diff is large. Writing to a file is more robust. Additionally, using an absolute path (/tmp/changed_files.txt) ensures the file remains accessible to consumers that set a custom working_directory (e.g. helm jobs), where a relative path would not survive the directory change.

[linear-code]

IN-1254

[theProf]

• feat: write changed files to file not env (IN-1254) #391 👈 (View in Graphite)
• master

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[theProf]

Merge activity

• Jun 5, 7:13 PM UTC: A user started a stack merge that includes this pull request via Graphite.
• Jun 5, 7:13 PM UTC: @theProf merged this pull request with Graphite.

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