Implement git init

packages/git/src/subcommands/__exports__.js

@@ -18,9 +18,11 @@
  */
 // Generated by /tools/gen.js
 import module_help from './help.js'
+import module_init from './init.js'
 import module_version from './version.js'
 
 export default {
     "help": module_help,
+    "init": module_init,
     "version": module_version,
 };

packages/git/src/subcommands/init.js

@@ -0,0 +1,97 @@
+/*
+ * Copyright (C) 2024  Puter Technologies Inc.
+ *
+ * This file is part of Puter's Git client.
+ *
+ * Puter's Git client is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+import git from 'isomorphic-git';
+import path from 'path-browserify';
+import { ErrorCodes } from '@heyputer/puter-js-common/src/PosixError.js';
+
+export default {
+    name: 'init',
+    usage: 'git init [--bare] [--initial-branch=BRANCH] [--separate-git-dir=DIR]',
+    description: `Initialize or re-initialize a git repository.`,
+    args: {
+        allowPositionals: true,
+        options: {
+            'bare': {
+                description: 'Create a bare repository',
+                type: 'boolean',
+                default: false,
+            },
+            'initial-branch': {
+                description: 'Name of the initial branch',
+                type: 'string',
+                short: 'b',
+            },
+            'separate-git-dir': {
+                description: 'Name of directory to store the git repository, instead of ./.git/',
+                type: 'string',
+                default: './.git',
+            },
+        },
+    },
+    execute: async (ctx) => {
+        const { io, fs, env, args } = ctx;
+        const { stdout, stderr } = io;
+        const { options, positionals } = args;
+
+        const [ directory, ...extra_positionals ] = positionals ?? [];
+        if (extra_positionals.length) {
+            stderr('Too many parameters');
+            return 1;
+        }
+
+        const dir = directory ? path.resolve(env.PWD, directory) : env.PWD;
+        const gitdir = path.resolve(dir, options['separate-git-dir']);
+        const dot_git_path = path.resolve(dir, './.git');
+
+        // Check if repo already initialized
+        let repo_exists = false;
+        try {
+            const stat = await fs.promises.stat(dot_git_path);
+            repo_exists = true;
+        } catch (e) {
+            if (e.posixCode === ErrorCodes.ENOENT) {
+                repo_exists = false;
+            }
+        }
+
+        if (repo_exists) {
+            // TODO: `git init` in an existing repo re-initializes it without erasing anything.
+            //  If the git dir provided is different than the existing one, it moves the contents to the new location.
+            //  isomorphic-git does not seem to do this, and it's an unusual case, so for now we just prevent `git init`
+            //  for existing repos.
+            stderr('Git repository already initialized');
+            return 1;
+        }
+
+        await git.init({
+            fs,
+            bare: options.bare,
+            dir,
+            gitdir,
+            defaultBranch: options['initial-branch'],
+        }).then(() => {
+            // If we're using a different git dir, create a .git file pointing to it
+            if (gitdir !== dot_git_path) {
+                return fs.promises.writeFile(dot_git_path, `gitdir: ${gitdir}\n`, { encoding: 'utf8' });
+            }
+        });
+
+        stdout(`Initialized empty git repository in ${gitdir}`);
+    }
+}