feat(version): add --signoff git flag

commands/version/README.md

@@ -71,6 +71,7 @@ Running `lerna version --conventional-commits` without the above flags will rele
     - [`--no-private`](#--no-private)
     - [`--no-push`](#--no-push)
     - [`--preid`](#--preid)
+    - [`--signoff-git-commit`](#--signoff-git-commit)
     - [`--sign-git-commit`](#--sign-git-commit)
     - [`--sign-git-tag`](#--sign-git-tag)
     - [`--force-git-tag`](#--force-git-tag)
@@ -212,8 +213,8 @@ When run with this flag, `lerna version` will release with bumped prerelease ver
 
 ```sh
 Changes:
- - major: 1.0.0-alpha.0 => 2.0.0-alpha.0 
- - minor: 1.0.0-alpha.0 => 1.1.0-alpha.0 
+ - major: 1.0.0-alpha.0 => 2.0.0-alpha.0
+ - minor: 1.0.0-alpha.0 => 1.1.0-alpha.0
  - patch: 1.0.0-alpha.0 => 1.0.1-alpha.0
 ```
 
@@ -412,6 +413,12 @@ lerna version prepatch --preid next
 When run with this flag, `lerna version` will increment `premajor`, `preminor`, `prepatch`, or `prerelease` semver
 bumps using the specified [prerelease identifier](http://semver.org/#spec-item-9).
 
+### `--signoff-git-commit`
+
+Adds the `--signoff` flag to the git commit done by lerna version when executed.
+
+> Note: This is different from `--sign-git-commit` which is about gpg signatures.
+
 ### `--sign-git-commit`
 
 This option is analogous to the `npm version` [option](https://docs.npmjs.com/misc/config#sign-git-commit) of the same name.

commands/version/__tests__/git-commit.test.js

@@ -43,4 +43,10 @@ describe("git commit", () => {
     await gitCommit("nice", { signGitCommit: true }, opts);
     expect(childProcess.exec).toHaveBeenLastCalledWith("git", ["commit", "--gpg-sign", "-m", "nice"], opts);
   });
+
+  test("--signoff-git-commit", async () => {
+    const opts = { cwd: "signed-off" };
+    await gitCommit("nice", { signoffGitCommit: true }, opts);
+    expect(childProcess.exec).toHaveBeenLastCalledWith("git", ["commit", "--signoff", "-m", "nice"], opts);
+  });
 });

commands/version/command.js

@@ -150,6 +150,10 @@ exports.builder = (yargs, composed) => {
       describe: "Pass the `--gpg-sign` flag to `git commit`.",
       type: "boolean",
     },
+    "signoff-git-commit": {
+      describe: "Pass the `--signoff` flag to `git commit`.",
+      type: "boolean",
+    },
     "sign-git-tag": {
       describe: "Pass the `--sign` flag to `git tag`.",
       type: "boolean",

commands/version/index.js

@@ -68,6 +68,7 @@ class VersionCommand extends Command {
       granularPathspec = true,
       push = true,
       signGitCommit,
+      signoffGitCommit,
       signGitTag,
       forceGitTag,
       tagVersionPrefix = "v",
@@ -96,6 +97,7 @@ class VersionCommand extends Command {
       commitHooks,
       granularPathspec,
       signGitCommit,
+      signoffGitCommit,
       signGitTag,
       forceGitTag,
     };

commands/version/lib/git-commit.js

@@ -12,7 +12,7 @@ module.exports.gitCommit = gitCommit;
  * @param {{ amend: boolean; commitHooks: boolean; signGitCommit: boolean; }} gitOpts
  * @param {import("@lerna/child-process").ExecOpts} opts
  */
-function gitCommit(message, { amend, commitHooks, signGitCommit }, opts) {
+function gitCommit(message, { amend, commitHooks, signGitCommit, signoffGitCommit }, opts) {
   log.silly("gitCommit", message);
   const args = ["commit"];
 
@@ -24,6 +24,10 @@ function gitCommit(message, { amend, commitHooks, signGitCommit }, opts) {
     args.push("--gpg-sign");
   }
 
+  if (signoffGitCommit) {
+    args.push("--signoff");
+  }
+
   if (amend) {
     args.push("--amend", "--no-edit");
   } else if (message.indexOf(EOL) > -1) {