Add preliminary CI scripts

Indent all C source files with clang-format-12.
At present, "make" is the only way to validate the build.

Author: jserv

.ci/check-format.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+
+set -e -u -o pipefail
+
+SOURCES=$(find $(git rev-parse --show-toplevel) | egrep "\.(c|cxx|cpp|h|hpp)\$")
+
+set -x
+
+for file in ${SOURCES};
+do
+    clang-format-12 ${file} > expected-format
+    diff -u -p --label="${file}" --label="expected coding style" ${file} expected-format
+done
+exit $(clang-format-12 --output-replacements-xml ${SOURCES} | egrep -c "</replacement>")

.ci/check-newline.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+
+set -e -u -o pipefail
+
+ret=0
+show=0
+# Reference: https://medium.com/@alexey.inkin/how-to-force-newline-at-end-of-files-and-why-you-should-do-it-fdf76d1d090e
+while IFS= read -rd '' f; do
+    if file --mime-encoding "$f" | grep -qv binary; then
+        tail -c1 < "$f" | read -r _ || show=1
+        if [ $show -eq 1 ]; then
+            echo "Warning: No newline at end of file $f"
+            ret=1
+            show=0
+        fi
+    fi
+done < <(git ls-files -z src tests/arch-test-target)
+
+exit $ret

.github/workflows/main.yml

@@ -0,0 +1,53 @@
+name: CI
+
+on: [push, pull_request]
+
+jobs:
+  detect-code-related-file-changes:
+    runs-on: ubuntu-22.04
+    outputs:
+      has_code_related_changes: ${{ steps.set_has_code_related_changes.outputs.has_code_related_changes }}
+    steps:
+      - name: Check out the repo
+        uses: actions/checkout@v4
+      - name: Test changed files
+        id: changed-files
+        uses: tj-actions/changed-files@v44
+        with:
+          files: |
+              .ci/**
+              mk/**
+              src/**
+              target/**
+              .clang-format
+              Makefile
+      - name: Set has_code_related_changes
+        id: set_has_code_related_changes
+        run: |
+          if [[ ${{ steps.changed-files.outputs.any_changed }} == true ]]; then
+            echo "has_code_related_changes=true" >> $GITHUB_OUTPUT
+          else
+            echo "has_code_related_changes=false" >> $GITHUB_OUTPUT
+          fi
+
+  host-x64:
+    needs: [detect-code-related-file-changes]
+    if: needs.detect-code-related-file-changes.outputs.has_code_related_changes == 'true'
+    runs-on: ubuntu-22.04
+    steps:
+    - uses: actions/checkout@v4
+    - name: default build
+      run: make
+
+  coding-style:
+    needs: [detect-code-related-file-changes]
+    if: needs.detect-code-related-file-changes.outputs.has_code_related_changes == 'true'
+    runs-on: ubuntu-22.04
+    steps:
+    - uses: actions/checkout@v4
+    - name: coding convention
+      run: |
+            sudo apt-get install -q -y clang-format-12
+            .ci/check-newline.sh
+            .ci/check-format.sh
+      shell: bash

src/diskimg.c

@@ -36,4 +36,4 @@ int diskimg_init(struct diskimg *diskimg, const char *file_path)
 void diskimg_exit(struct diskimg *diskimg)
 {
     close(diskimg->fd);
-}
+}

src/virtio-blk.c

@@ -194,4 +194,4 @@ void virtio_blk_exit(struct virtio_blk_dev *dev)
     virtio_pci_exit(&dev->virtio_pci_dev);
     close(dev->irqfd);
     close(dev->ioeventfd);
-}
+}

src/virtio-blk.h

@@ -41,4 +41,4 @@ void virtio_blk_init_pci(struct virtio_blk_dev *dev,
                          struct diskimg *diskimg,
                          struct pci *pci,
                          struct bus *io_bus,
-                         struct bus *mmio_bus);
+                         struct bus *mmio_bus);

src/virtio-pci.h

@@ -54,4 +54,4 @@ void virtio_pci_init(struct virtio_pci_dev *dev,
                      struct pci *pci,
                      struct bus *io_bus,
                      struct bus *mmio_bus);
-void virtio_pci_exit();
+void virtio_pci_exit();

src/virtq.c

@@ -63,4 +63,4 @@ void virtq_handle_avail(struct virtq *vq)
     virtq_complete_request(vq);
     if (vq->guest_event->flags == VRING_PACKED_EVENT_FLAG_ENABLE)
         virtq_notify_used(vq);
-}
+}

src/virtq.h

@@ -42,4 +42,4 @@ void virtq_complete_request(struct virtq *vq);
 void virtq_notify_used(struct virtq *vq);
 void virtq_deassert_irq(struct virtq *vq);
 void virtq_handle_avail(struct virtq *vq);
-void virtq_init(struct virtq *vq, void *dev, struct virtq_ops *ops);
+void virtq_init(struct virtq *vq, void *dev, struct virtq_ops *ops);