Remove unneeded commit information from build logs (#345)

* Remove unneeded commit information from stdout

src/git-command-manager.ts

@@ -31,7 +31,7 @@ export interface IGitCommandManager {
   isDetached(): Promise<boolean>
   lfsFetch(ref: string): Promise<void>
   lfsInstall(): Promise<void>
-  log1(): Promise<string>
+  log1(format?: string): Promise<string>
   remoteAdd(remoteName: string, remoteUrl: string): Promise<void>
   removeEnvironmentVariable(name: string): void
   revParse(ref: string): Promise<string>
@@ -254,8 +254,10 @@ class GitCommandManager {
     await this.execGit(['lfs', 'install', '--local'])
   }
 
-  async log1(): Promise<string> {
-    const output = await this.execGit(['log', '-1'])
+  async log1(format?: string): Promise<string> {
+    var args = format ? ['log', '-1', format] : ['log', '-1']
+    var silent = format ? false : true
+    const output = await this.execGit(args, false, silent)
     return output.stdout
   }
 
@@ -390,7 +392,8 @@ class GitCommandManager {
 
   private async execGit(
     args: string[],
-    allowAllExitCodes = false
+    allowAllExitCodes = false,
+    silent = false
   ): Promise<GitOutput> {
     fshelper.directoryExistsSync(this.workingDirectory, true)
 
@@ -409,6 +412,7 @@ class GitCommandManager {
     const options = {
       cwd: this.workingDirectory,
       env,
+      silent,
       ignoreReturnCode: allowAllExitCodes,
       listeners: {
         stdout: (data: Buffer) => {

src/git-source-provider.ts

@@ -201,9 +201,12 @@ export async function getSource(settings: IGitSourceSettings): Promise<void> {
       }
     }
 
-    // Dump some info about the checked out commit
+    // Get commit information
     const commitInfo = await git.log1()
 
+    // Log commit sha
+    await git.log1("--format='%H'")
+
     // Check for incorrect pull request merge commit
     await refHelper.checkCommitInfo(
       settings.authToken,