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build-rust: make rustup's install paths group-writable for crate-pinned toolchains #140

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Merged
Jonathan Gangi (JAVGan) merged 1 commit into from
Nov 10, 2026
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build-rust: make rustup's install paths group-writable for crate-pinned toolchains #140

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10 changes: 10 additions & 0 deletions build_scripts/build-rust.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -74,6 +74,16 @@ cp -r "${RUSTUP_HOME}" /manylinux-rootfs"${PREFIX}"/
mkdir -p /manylinux-rootfs"${PREFIX}"/cargo/{registry,git}
chmod -R g+w /manylinux-rootfs"${PREFIX}"/cargo/{registry,git}/

# A crate can pin a different toolchain via rust-toolchain.toml, which makes
# rustup install it at build time. That writes to tmp, downloads, toolchains and
# update-hashes, and updates settings.toml. Not recursive: toolchains/ only needs
# to be writable so a new toolchain directory can be created, and -R here would
# make already-installed toolchain binaries writable too.
mkdir -p /manylinux-rootfs"${PREFIX}"/rustup/{tmp,downloads,toolchains,update-hashes}
chmod g+w /manylinux-rootfs"${PREFIX}"/rustup \
/manylinux-rootfs"${PREFIX}"/rustup/{tmp,downloads,toolchains,update-hashes}
chmod g+w /manylinux-rootfs"${PREFIX}"/rustup/settings.toml

# Create wrapper scripts that set environment variables
mkdir -p /manylinux-rootfs/usr/local/bin
cat > /manylinux-rootfs/usr/local/bin/rustc <<EOF
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