Merge pull request #445 from karlseguin/capture_git_commit

Make the the short git SHA available within the program

.github/workflows/build.yml

@@ -28,7 +28,7 @@ jobs:
       - uses: ./.github/actions/install
 
       - name: zig build
-        run: zig build --release=safe -Doptimize=ReleaseSafe -Dengine=v8 -Dcpu=x86_64
+        run: zig build --release=safe -Doptimize=ReleaseSafe -Dengine=v8 -Dcpu=x86_64 -Dgit_commit=$(git rev-parse --short ${{ github.sha }})
 
       - name: Rename binary
         run: mv zig-out/bin/lightpanda lightpanda-${{ env.ARCH }}-${{ env.OS }}
@@ -60,7 +60,7 @@ jobs:
           arch: ${{env.ARCH}}
 
       - name: zig build
-        run: zig build --release=safe -Doptimize=ReleaseSafe -Dengine=v8
+        run: zig build --release=safe -Doptimize=ReleaseSafe -Dengine=v8 -Dgit_commit=$(git rev-parse --short ${{ github.sha }})
 
       - name: Rename binary
         run: mv zig-out/bin/lightpanda lightpanda-${{ env.ARCH }}-${{ env.OS }}

Makefile

@@ -59,13 +59,13 @@ download-zig:
 ## Build in release-safe mode
 build:
 	@printf "\e[36mBuilding (release safe)...\e[0m\n"
-	@$(ZIG) build -Doptimize=ReleaseSafe -Dengine=v8 || (printf "\e[33mBuild ERROR\e[0m\n"; exit 1;)
+	$(ZIG) build -Doptimize=ReleaseSafe -Dengine=v8 -Dgit_commit=$$(git rev-parse --short HEAD) || (printf "\e[33mBuild ERROR\e[0m\n"; exit 1;)
 	@printf "\e[33mBuild OK\e[0m\n"
 
 ## Build in debug mode
 build-dev:
 	@printf "\e[36mBuilding (debug)...\e[0m\n"
-	@$(ZIG) build -Dengine=v8 || (printf "\e[33mBuild ERROR\e[0m\n"; exit 1;)
+	@$(ZIG) build -Dengine=v8 -Dgit_commit=$$(git rev-parse --short HEAD) || (printf "\e[33mBuild ERROR\e[0m\n"; exit 1;)
 	@printf "\e[33mBuild OK\e[0m\n"
 
 ## Run the server in debug mode

build.zig

@@ -58,6 +58,15 @@ pub fn build(b: *std.Build) !void {
         .optimize = mode,
     });
     try common(b, exe, options);
+    {
+        var opt = b.addOptions();
+        opt.addOption(
+            []const u8,
+            "git_commit",
+            b.option([]const u8, "git_commit", "Current git commit") orelse "dev",
+        );
+        exe.root_module.addImport("build_info", opt.createModule());
+    }
     b.installArtifact(exe);
 
     // run

src/main.zig

@@ -59,6 +59,10 @@ pub fn main() !void {
 
     switch (args.mode) {
         .help => args.printUsageAndExit(args.mode.help),
+        .version => {
+            std.debug.print("{s}\n", .{@import("build_info").git_commit});
+            return std.process.cleanExit();
+        },
         .serve => |opts| {
             const address = std.net.Address.parseIp4(opts.host, opts.port) catch |err| {
                 log.err("address (host:port) {any}\n", .{err});
@@ -125,12 +129,14 @@ const Command = struct {
         help,
         fetch,
         serve,
+        version,
     };
 
     const Mode = union(ModeType) {
         help: bool, // false when being printed because of an error
         fetch: Fetch,
         serve: Serve,
+        version: void,
     };
 
     const Serve = struct {
@@ -172,10 +178,13 @@ const Command = struct {
             \\--timeout       Inactivity timeout in seconds before disconnecting clients
             \\                Defaults to 3 (seconds)
             \\
+            \\version command
+            \\Displays the version of {s}
+            \\
             \\help command
             \\Displays this message
         ;
-        std.debug.print(usage, .{ self.exec_name, self.exec_name, self.exec_name });
+        std.debug.print(usage, .{ self.exec_name, self.exec_name, self.exec_name, self.exec_name });
         if (success) {
             return std.process.cleanExit();
         }
@@ -210,9 +219,10 @@ fn parseArgs(allocator: Allocator) !Command {
     };
 
     cmd.mode = switch (mode) {
-        .help => Command.Mode{ .help = true },
+        .help => .{ .help = true },
-        .serve => Command.Mode{ .serve = parseServeArgs(allocator, &args) catch return cmd },
+        .serve => .{ .serve = parseServeArgs(allocator, &args) catch return cmd },
-        .fetch => Command.Mode{ .fetch = parseFetchArgs(allocator, &args) catch return cmd },
+        .fetch => .{ .fetch = parseFetchArgs(allocator, &args) catch return cmd },
+        .version => .{ .version = {} },
     };
     return cmd;
 }