It read 'dev' on the live site, so it was decoration rather than evidence.
Cause: Coolify does not pass a commit SHA into a Docker Compose build, so my
${BUILD_SHA:-dev} fallback always won.
Read from build.txt in the repo instead, which cannot drift from what is
deployed. Two things that took a try each:
- Docker's ENV does not evaluate $(cat file), so the file is copied into the
image and read at startup.
- Streamlit executes app.py in an exec context where __file__ is not
guaranteed; a bare reference to it inside build_sha() would have taken the
whole app down. It now walks a list of candidate paths and never raises.
Verified: docker build ok; build.txt inside the image reads e1f4127;
build_sha() resolves to e1f4127 in the container; the sidebar renders it.
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