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fix(ccache): set max-size + compression via ENV (image-build config was shadowed) 

The previous bump to 8G (PR #153) didn't take effect on prod. Verified
post-deploy:

    Cache size (GB):  2.0 / 2.0 (99.95%)

Cause: $CCACHE_DIR (/var/cache/ccache) is a named docker volume. Any
config we wrote into it via `ccache --set-config max_size 8G` during
the RUN step gets masked at runtime by the mount of the existing
volume — which still contained the original 2 GB config from when the
cache was first populated.

Fix: set CCACHE_MAXSIZE / CCACHE_COMPRESS / CCACHE_COMPRESSLEVEL as
ENV in the Dockerfile. ccache reads those at runtime and they
override any conf-file value, including whatever stale config is
sitting in the volume.

After this lands and the submodule bumps, `ccache -s` should report
the new 8 GB max immediately on container start without needing to
wipe or re-init the cache volume.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
davidmonterocrespo24 2026-05-09 17:11:49 +02:00
parent 8664e13ca9
commit e7157b7f05
1 changed files with 11 additions and 4 deletions
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15
Dockerfile.standalone
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@ -191,10 +191,17 @@ ENV IDF_CCACHE_ENABLE=1
# ccache hit across compiles even though some flags (-I, -fmacro-prefix-map)
# embed absolute paths into the command line.
ENV CCACHE_BASEDIR=/var/lib/velxio-build
RUN mkdir -p /var/cache/ccache \
&& ccache --max-size=8G \
&& ccache --set-config=compression=true \
&& ccache --set-config=compression_level=6
# Cache cap, compression. These are set as env vars (rather than written
# to /var/cache/ccache/ccache.conf via `ccache --set-config` at image-build
# time) because $CCACHE_DIR is a named volume — anything we write into it
# during build is masked at runtime by the volume mount, so config in the
# image gets shadowed by whatever's already in the volume. ccache reads
# CCACHE_MAXSIZE / CCACHE_COMPRESS / CCACHE_COMPRESSLEVEL at runtime,
# overriding any conf-file value.
ENV CCACHE_MAXSIZE=8G
ENV CCACHE_COMPRESS=1
ENV CCACHE_COMPRESSLEVEL=6
RUN mkdir -p /var/cache/ccache
# Install ESP-IDF Python dependencies using the final image's Python
# The requirements.txt has version constraints required by ESP-IDF 4.4.x