Do not install rustup-toolchain if it is in PATH
I find it quiet annoying because I manually build `rustup-toolchain-install-master`
and install it in `PATH` other than in `~/.cargo/bin`. So everytime I run the script,
it always reinstall `rustup-toolchain-install-master` for me.
changelog: none
#!/bin/bash
# Set up the appropriate rustc toolchain
-cd $(dirname $0)
+cd "$(dirname "$0")"
+
+if ! command -v rustup-toolchain-install-master > /dev/null; then
+ cargo install rustup-toolchain-install-master --debug
+fi
-cargo install rustup-toolchain-install-master --debug || echo "rustup-toolchain-install-master already installed"
RUSTC_HASH=$(git ls-remote https://github.com/rust-lang/rust.git master | awk '{print $1}')
-rustup-toolchain-install-master -f -n master $RUSTC_HASH
+rustup-toolchain-install-master -f -n master "$RUSTC_HASH"
rustup override set master