Revert "Use the new component dependency option of the rust-toolchain file"

This reverts commit 648caced6e.

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.github/workflows/bootstrap_rustc.yml

@@ -34,7 +34,6 @@ jobs:
       run: |
         git config --global user.email "user@example.com"
         git config --global user.name "User"
-        rustup self update
         ./prepare.sh
 
     - name: Test

.github/workflows/main.yml

@@ -40,7 +40,6 @@ jobs:
       run: |
         git config --global user.email "user@example.com"
         git config --global user.name "User"
-        rustup self update
         ./prepare.sh
 
     - name: Test

prepare.sh

@@ -1,6 +1,7 @@
 #!/bin/bash --verbose
 set -e
 
+rustup component add rust-src rustc-dev llvm-tools-preview
 ./build_sysroot/prepare_sysroot_src.sh
 cargo install hyperfine || echo "Skipping hyperfine install"
 

rust-toolchain

@@ -1,3 +1 @@
-[toolchain]
-channel = "nightly-2020-11-27"
-components = ["rust-src", "rustc-dev", "llvm-tools-preview"]
+nightly-2020-11-27

scripts/cargo.sh

@@ -4,7 +4,7 @@ dir=$(dirname "$0")
 source "$dir/config.sh"
 
 # read nightly compiler from rust-toolchain file
-TOOLCHAIN=$(cat "$dir/rust-toolchain" | grep channel | sed "s/channel = \"\(.*\)\"/\1/")
+TOOLCHAIN=$(cat "$dir/rust-toolchain")
 
 cmd=$1
 shift || true

scripts/rustup.sh

@@ -8,7 +8,7 @@ case $1 in
 
         echo "=> Installing new nightly"
         rustup toolchain install --profile minimal "nightly-${TOOLCHAIN}" # Sanity check to see if the nightly exists
-        sed -i "s/\"nightly-.*\"/\"nightly-${TOOLCHAIN}\"/" rust-toolchain
+        echo "nightly-${TOOLCHAIN}" > rust-toolchain
         rustup component add rustfmt || true
 
         echo "=> Uninstalling all old nighlies"