Merge pull request #17 from ojacobson/auto-update-nightly

Automate periodic Rust Nightly upgrades.

6 files changed, 48 insertions, 11 deletions

diff --git a/.github/workflows/nightly-rust-update.yml b/.github/workflows/nightly-rust-update.yml
new file mode 100644
index 0000000..00ff6e6
--- /dev/null
+++ b/.github/workflows/nightly-rust-update.yml
@@ -0,0 +1,27 @@
+name: Update Rust nightly
+on:
+    workflow_dispatch:
+    schedule:
+        # Nothing magic here, I just wanted to avoid the midnight thundering
+        # herd on the first of each month.
+        - cron: '0 5 8 * *'
+
+jobs:
+    nightly-update:
+        name: Update Rust nightly
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v2
+            - run: tools/update-nightly
+            - run: tools/install-tool-dependencies
+            - run: tools/checks
+            - uses: peter-evans/create-pull-request@v3
+              with:
+                commit-message: Update Rust nightly version.
+                branch: rust-nightly-update
+                title: Update Rust nightly version
+                body: |
+                    If these changes look good, merge this pull request to
+                    update to the latest Nightly as of today.
+                    
+                    Automatically generated by the nightly-rust-update workflow.
diff --git a/.travis.yml b/.travis.yml
index 5e41e58..64c0120 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,8 +5,7 @@ rust:
 cache: cargo
 
 install:
-    - rustup component add clippy rustfmt
-    - cargo install cargo-udeps
+    - tools/install-tool-dependencies
     - cargo build
 
 script:
diff --git a/README.md b/README.md
index 4dc7c75..e8ff197 100644
--- a/README.md
+++ b/README.md
@@ -45,16 +45,10 @@ you're willing to take that chance.
 
 To set this up:
 
-* Install additional Rust components:
+* Install additional Rust components and Cargo binaries:
 
     ```bash
-    rustup component add clippy rustfmt
-    ```
-
-* Install `cargo-udeps`:
-
-    ```bash
-    cargo install cargo-udeps
+    tools/install-tool-dependencies
     ```
 
 * Configure Git to use these hooks:
diff --git a/rust-toolchain b/rust-toolchain
index 4eabcfe..4aec5c6 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -1 +1 @@
-nightly-2020-07-26
+nightly-2020-06-10
diff --git a/tools/install-tool-dependencies b/tools/install-tool-dependencies
new file mode 100755
index 0000000..27a9015
--- /dev/null
+++ b/tools/install-tool-dependencies
@@ -0,0 +1,9 @@
+#!/bin/bash -ex
+
+# tools/install-tool-dependencies
+#
+# Install Rust and Cargo components used by tool scripts, which are not part of
+# Cargo.toml.
+
+rustup component add clippy rustfmt
+cargo install cargo-udeps
\ No newline at end of file
diff --git a/tools/update-nightly b/tools/update-nightly
new file mode 100755
index 0000000..7567110
--- /dev/null
+++ b/tools/update-nightly
@@ -0,0 +1,8 @@
+#!/bin/bash -ex
+
+# tools/update-nightly
+#
+# Install today's nightly Rust release.
+
+date "+nightly-%Y-%m-%d" > rust-toolchain
+rustup install --profile minimal "$(< rust-toolchain)"