git: alternative github context and additional methods

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

src/buildx/install.ts

@@ -73,7 +73,7 @@ export class Install {
     if (ref.match(/^[0-9a-fA-F]{40}$/)) {
       vspec = ref;
     } else {
-      vspec = await Git.getRemoteSha(repo, ref);
+      vspec = await Git.remoteSha(repo, ref);
     }
     core.debug(`Install.build: tool version spec ${vspec}`);
 

src/git.ts

@@ -15,21 +15,81 @@
  */
 
 import {Exec} from './exec';
+import {Context} from '@actions/github/lib/context';
+import {Context as GitContext} from './types/git';
 
 export class Git {
-  public static async getRemoteSha(repo: string, ref: string): Promise<string> {
-    return await Exec.getExecOutput(`git`, ['ls-remote', repo, ref], {
-      ignoreReturnCode: true,
-      silent: true
-    }).then(res => {
-      if (res.stderr.length > 0 && res.exitCode != 0) {
-        throw new Error(res.stderr);
-      }
-      const [rsha] = res.stdout.trim().split(/[\s\t]/);
+  public static async context(): Promise<GitContext> {
+    const ctx = new Context();
+    ctx.ref = await Git.ref();
+    ctx.sha = await Git.fullCommit();
+    return ctx;
+  }
+
+  public static async isInsideWorkTree(): Promise<boolean> {
+    return await Git.exec(['rev-parse', '--is-inside-work-tree'])
+      .then(out => {
+        return out === 'true';
+      })
+      .catch(() => {
+        return false;
+      });
+  }
+
+  public static async remoteSha(repo: string, ref: string): Promise<string> {
+    return await Git.exec(['ls-remote', repo, ref]).then(out => {
+      const [rsha] = out.split(/[\s\t]/);
       if (rsha.length == 0) {
         throw new Error(`Cannot find remote ref for ${repo}#${ref}`);
       }
       return rsha;
     });
   }
+
+  public static async remoteURL(): Promise<string> {
+    return await Git.exec(['remote', 'get-url', 'origin']).then(rurl => {
+      if (rurl.length == 0) {
+        return Git.exec(['remote', 'get-url', 'upstream']).then(rurl => {
+          if (rurl.length == 0) {
+            throw new Error(`Cannot find remote URL for origin or upstream`);
+          }
+          return rurl;
+        });
+      }
+      return rurl;
+    });
+  }
+
+  public static async ref(): Promise<string> {
+    return await Git.exec(['symbolic-ref', 'HEAD']);
+  }
+
+  public static async fullCommit(): Promise<string> {
+    return await Git.exec(['show', '--format=%H', 'HEAD', '--quiet', '--']);
+  }
+
+  public static async shortCommit(): Promise<string> {
+    return await Git.exec(['show', '--format=%h', 'HEAD', '--quiet', '--']);
+  }
+
+  public static async tag(): Promise<string> {
+    return await Git.exec(['tag', '--points-at', 'HEAD', '--sort', '-version:creatordate']).then(tags => {
+      if (tags.length == 0) {
+        return Git.exec(['describe', '--tags', '--abbrev=0']);
+      }
+      return tags.split('\n')[0];
+    });
+  }
+
+  private static async exec(args: string[] = []): Promise<string> {
+    return await Exec.getExecOutput(`git`, args, {
+      ignoreReturnCode: true,
+      silent: true
+    }).then(res => {
+      if (res.stderr.length > 0 && res.exitCode != 0) {
+        throw new Error(res.stderr);
+      }
+      return res.stdout.trim();
+    });
+  }
 }

src/types/git.ts

@@ -0,0 +1,19 @@
+/**
+ * Copyright 2023 actions-toolkit authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import {Context as GitHubContext} from '@actions/github/lib/context';
+
+export type Context = GitHubContext;