How to cache bunx folder ?

[seepine]

I found the BUN_INSTALL_CACHE_DIR env, but it doesn't seem to be effective for Bunx.

Dockerfile

FROM oven/bun:alpine
RUN apk add --no-cache libstdc++

WORKDIR /workspace
ENV WORKSPACE_FOLDER=/workspace
EXPOSE 3000
ENTRYPOINT ["/bin/sh", "-c", "BUN_INSTALL_CACHE_DIR=$WORKSPACE_FOLDER/.bun/install/cache && bunx xxx"]

And

docker run --rm -v ./data:/workspace bun-demo

But i cannot found .bun dir in my ./data

[SX110903]

el problema es que BUN_INSTALL_CACHE_DIR solo afecta al cache de paquetes instalados, no al de bunx que va por otro lado. para cachear bunx en docker tienes que montar el directorio ~/.bun directamente:

FROM oven/bun:alpine
WORKDIR /workspace
VOLUME /root/.bun
ENTRYPOINT ["bunx", "xxx"]

y luego en el docker run:

docker run --rm -v bun-cache:/root/.bun tu-imagen

con un named volume se mantiene entre ejecuciones. si estas en ci/cd la mayoria tienen soporte para cachear volumes de docker directamente. la ruta exacta del cache de bunx suele ser ~/.bun/install/cache pero el volumen entero es lo mas facil de gestionar

[Shubrathshetty]

Your ENV is set only inside the ENTRYPOINT command:
ENTRYPOINT ["/bin/sh", "-c", "BUN_INSTALL_CACHE_DIR=$WORKSPACE_FOLDER/.bun/install/cache && bunx xxx"]
This sets the var too late / only for that line — sometimes bunx ignores it or doesn't create dirs if no download happens.
Fix (short version)
Move the env var to Dockerfile level + pre-create the dir:
FROM oven/bun:alpine
RUN apk add --no-cache libstdc++

WORKDIR /workspace
ENV WORKSPACE_FOLDER=/workspace
ENV BUN_INSTALL_CACHE_DIR=/workspace/.bun/install/cache

Pre-create so permissions are good (runs as root)

RUN mkdir -p $BUN_INSTALL_CACHE_DIR

EXPOSE 3000
ENTRYPOINT ["bunx", "xxx"] # or keep shell if needed
Now, when bunx xxx downloads anything:
Cache goes to /workspace/.bun/install/cache
After docker run -v ./data:/workspace ..., you'll see ./data/.bun/install/cache populated.
If xxx is a one-off tool that doesn't download (or already cached in image), nothing new appears. Test with something like bunx cowsay hello to force a download.