Use josh-sync instead of miri-script for Josh synchronization

.github/workflows/ci.yml

@@ -147,35 +147,48 @@ jobs:
       - uses: actions/checkout@v4
         with:
           fetch-depth: 256 # get a bit more of the history
-      - name: install josh-proxy
-        run: cargo +stable install josh-proxy --git https://github.com/josh-project/josh --tag r24.10.04
+      - name: install josh-sync
+        run: cargo +stable install --locked --git https://github.com/rust-lang/josh-sync
       - name: setup bot git name and email
         run: |
           git config --global user.name 'The Miri Cronjob Bot'
           git config --global user.email 'miri@cron.bot'
       - name: Install nightly toolchain
         run: rustup toolchain install nightly --profile minimal
-      - name: get changes from rustc
-        run: ./miri rustc-pull
       - name: Install rustup-toolchain-install-master
         run: cargo install -f rustup-toolchain-install-master
-      - name: format changes (if any)
+      - name: Push changes to a branch and create PR
         run: |
+          # Make it easier to see what happens.
+          set -x
+          # Temporarily disable early exit to examine the status code of rustc-josh-sync
+          set +e
+          rustc-josh-sync pull
+          exitcode=$?
+          set -e
+
+          # If there were no changes to pull, rustc-josh-sync returns status code 2.
+          # In that case, skip the rest of the job.
+          if [ $exitcode -eq 2 ]; then
+            echo "Nothing changed in rustc, skipping PR"
+            exit 0
+          elif [ $exitcode -ne 0 ]; then
+            # If return code was not 0 or 2, rustc-josh-sync actually failed
+            echo "error: rustc-josh-sync failed"
+            exit ${exitcode}
+          fi
+
+          # Format changes
           ./miri toolchain
           ./miri fmt --check || (./miri fmt && git commit -am "fmt")
-      - name: Push changes to a branch and create PR
-        run: |
-          # `git diff --exit-code` "succeeds" if the diff is empty.
-          if git diff --exit-code HEAD^; then echo "Nothing changed in rustc, skipping PR"; exit 0; fi
-          # The diff is non-empty, create a PR.
+
+          # Create a PR
           BRANCH="rustup-$(date -u +%Y-%m-%d)"
           git switch -c $BRANCH
           git push -u origin $BRANCH
           gh pr create -B master --title 'Automatic Rustup' --body 'Please close and re-open this PR to trigger CI, then enable auto-merge.'
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          ZULIP_BOT_EMAIL: ${{ secrets.ZULIP_BOT_EMAIL }}
-          ZULIP_API_TOKEN: ${{ secrets.ZULIP_API_TOKEN }}
 
   cron-fail-notify:
     name: cronjob failure notification

CONTRIBUTING.md

@@ -297,25 +297,27 @@ You can also directly run Miri on a Rust source file:
 
 ## Advanced topic: Syncing with the rustc repo
 
-We use the [`josh` proxy](https://github.com/josh-project/josh) to transmit changes between the
+We use the [`josh-sync`](https://github.com/rust-lang/josh-sync) tool to transmit changes between the
 rustc and Miri repositories. You can install it as follows:
 
 ```sh
-cargo +stable install josh-proxy --git https://github.com/josh-project/josh --tag r24.10.04
+cargo install --locked --git https://github.com/rust-lang/josh-sync
 ```
 
-Josh will automatically be started and stopped by `./miri`.
+The commands below will automatically install and manage the [Josh](https://github.com/josh-project/josh) proxy that performs the actual work.
 
 ### Importing changes from the rustc repo
 
 *Note: this usually happens automatically, so these steps rarely have to be done by hand.*
 
 We assume we start on an up-to-date master branch in the Miri repo.
 
+1) First, create a branch for the pull, e.g. `git checkout -b rustup`
+2) Then run the following:
 ```sh
 # Fetch and merge rustc side of the history. Takes ca 5 min the first time.
 # This will also update the `rustc-version` file.
-./miri rustc-pull
+rustc-josh-sync pull
 # Update local toolchain and apply formatting.
 ./miri toolchain && ./miri fmt
 git commit -am "rustup"
@@ -328,12 +330,12 @@ needed.
 
 ### Exporting changes to the rustc repo
 
-We will use the josh proxy to push to your fork of rustc. Run the following in the Miri repo,
+We will use the `josh-sync` tool to push to your fork of rustc. Run the following in the Miri repo,
 assuming we are on an up-to-date master branch:
 
 ```sh
 # Push the Miri changes to your rustc fork (substitute your github handle for YOUR_NAME).
-./miri rustc-push YOUR_NAME miri
+rustc-josh-sync push miri YOUR_NAME
 ```
 
 This will create a new branch called `miri` in your fork, and the output should include a link that

josh-sync.toml

@@ -0,0 +1,2 @@
+repo = "miri"
+filter = ":rev(75dd959a3a40eb5b4574f8d2e23aa6efbeb33573:prefix=src/tools/miri):/src/tools/miri"

miri-script/Cargo.toml

@@ -22,7 +22,6 @@ anyhow = "1.0"
 xshell = "0.2.6"
 rustc_version = "0.4"
 dunce = "1.0.4"
-directories = "6"
 serde = "1"
 serde_json = "1"
 serde_derive = "1"