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new 82b6fa5780 GH-50208: [CI][C++][Python] Disable ccache `hash_dir`
(#50209)
82b6fa5780 is described below
commit 82b6fa57803f8161132a2cb0100ae81873c7b517
Author: Antoine Pitrou <[email protected]>
AuthorDate: Thu Jun 18 11:29:46 2026 +0200
GH-50208: [CI][C++][Python] Disable ccache `hash_dir` (#50209)
### Rationale for this change
By default, ccache hashes the path to the current directory in its cache
key. However, some builds put their source files in a temporary directory (such
as Python builds), which makes caching inefficient as the current directory is
different everytime.
### What changes are included in this PR?
Disable the ccache `hash_dir` option on CI, using an environment variable.
### Are these changes tested?
Yes, by existing CI jobs.
I also checked locally using `ccache -s` that this improves the caching of
compiled C++ artifacts (from the source files in `python/pyarrow/src`) when
building PyArrow.
### Are there any user-facing changes?
No.
* GitHub Issue: #50208
Authored-by: Antoine Pitrou <[email protected]>
Signed-off-by: Antoine Pitrou <[email protected]>
---
ci/scripts/ccache_setup.sh | 2 ++
compose.yaml | 3 +++
2 files changed, 5 insertions(+)
diff --git a/ci/scripts/ccache_setup.sh b/ci/scripts/ccache_setup.sh
index df00efe702..4006a63a73 100755
--- a/ci/scripts/ccache_setup.sh
+++ b/ci/scripts/ccache_setup.sh
@@ -19,10 +19,12 @@
set -eux
+# See similar definitions in compose.yaml under the `x-ccache` key
{
echo "ARROW_USE_CCACHE=ON"
echo "CCACHE_COMPILERCHECK=content"
echo "CCACHE_COMPRESS=1"
echo "CCACHE_COMPRESSLEVEL=6"
echo "CCACHE_MAXSIZE=1G"
+ echo "CCACHE_NOHASHDIR=1"
} >> "$GITHUB_ENV"
diff --git a/compose.yaml b/compose.yaml
index 119a8fc589..dbb22862ae 100644
--- a/compose.yaml
+++ b/compose.yaml
@@ -59,6 +59,9 @@ x-ccache: &ccache
CCACHE_COMPRESSLEVEL: 6
CCACHE_MAXSIZE: 1G
CCACHE_DIR: /ccache
+ # Some builds (such as PyArrow) copy their source files in a temporary
directory,
+ # avoid hashing the current directory to make ccache useful on those builds.
+ CCACHE_NOHASHDIR: 1
x-common: &common
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