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Share ccache volume across checkouts, cap at 2G

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The ccache named volume had no explicit name, so Docker Compose
namespaced it under the per-checkout project name (derived from
UNIQUE_ID), giving each checkout its own cache even though
docker/README.md already documented them as shared. Give the volume
a fixed name so all checkouts attach the same one.

Measured cache size after a full build (IfcParse+IfcGeom+IfcConvert+
wrapper, one Python version) is ~300MB, only ~5% of the previous 5G
cap. Shrink CCACHE_MAXSIZE to 2G, which comfortably covers the shared
baseline plus per-branch deltas from several diverging checkouts.

Generated with the assistance of an AI coding tool.

(cherry picked from commit b1470223d3)
This commit is contained in:
Stephen Boddy
2026-07-13 06:37:51 +01:00
committed by Dion Moult
parent 4f0e1f718d
commit eadd12cad4
2 changed files with 5 additions and 1 deletions
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docker/Dockerfile
+4 -1
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@@ -28,8 +28,11 @@ RUN git config --system --add safe.directory '*'
# volume mount point at runtime - anything `ccache -M` writes to a config
# file under it during this build gets shadowed once the real volume is
# mounted, so the size cap only actually takes effect via the env var.
# 2G is generous: a full build (IfcParse+IfcGeom+IfcConvert+wrapper, one
# Python version) measures ~300MB, and the volume is now shared across all
# checkouts (see compose.yaml), so this covers several diverging branches.
ENV CCACHE_DIR=/ccache
ENV CCACHE_MAXSIZE=5G
ENV CCACHE_MAXSIZE=2G
ENV PATH="/usr/lib/ccache:$PATH"
# Non-root user matching the host UID/GID that bind-mounts the repo (default