Add make archives scripts.

pre_commit/make_archives.py

@@ -0,0 +1,65 @@
+from __future__ import absolute_import
+from __future__ import print_function
+from __future__ import unicode_literals
+
+import os.path
+import shutil
+from plumbum import local
+
+from pre_commit.util import tarfile_open
+from pre_commit.util import tmpdir
+
+
+# This is a script for generating the tarred resources for git repo
+# dependencies.  Currently it's just for "vendoring" ruby support packages.
+
+
+REPOS = (
+    ('rbenv', 'git://github.com/sstephenson/rbenv', '13a474c'),
+    ('ruby-build', 'git://github.com/sstephenson/ruby-build', 'd3d5fe0'),
+    (
+        'ruby-download',
+        'git://github.com/garnieretienne/rvm-download',
+        'f2e9f1e',
+    ),
+)
+
+
+RESOURCES_DIR = os.path.abspath(
+    os.path.join(os.path.dirname(__file__), 'resources')
+)
+
+
+def make_archive(name, repo, ref, destdir):
+    """Makes an archive of a repository in the given destdir.
+
+    :param text name: Name to give the archive.  For instance foo.  The file
+    that is created will be called foo.tar.gz.
+    :param text repo: Repository to clone.
+    :param text ref: Tag/SHA/branch to check out.
+    :param text destdir: Directory to place archives in.
+    """
+    output_path = os.path.join(destdir, name + '.tar.gz')
+    with tmpdir() as tempdir:
+        # Clone the repository to the temporary directory
+        local['git']('clone', repo, tempdir)
+        with local.cwd(tempdir):
+            local['git']('checkout', ref)
+
+        # We don't want the '.git' directory
+        shutil.rmtree(os.path.join(tempdir, '.git'))
+
+        with tarfile_open(output_path, 'w|gz') as tf:
+            tf.add(tempdir, name)
+
+    return output_path
+
+
+def main():
+    for archive_name, repo, ref in REPOS:
+        print('Making {0}.tar.gz for {1}@{2}'.format(archive_name, repo, ref))
+        make_archive(archive_name, repo, ref, RESOURCES_DIR)
+
+
+if __name__ == '__main__':
+    exit(main())

pre_commit/util.py

@@ -7,6 +7,8 @@ import os
 import os.path
 import shutil
 import sys
+import tarfile
+import tempfile
 
 
 def memoize_by_cwd(func):
@@ -65,3 +67,25 @@ def hex_md5(s):
     :param text s:
     """
     return hashlib.md5(s.encode('utf-8')).hexdigest()
+
+
+@contextlib.contextmanager
+def tarfile_open(*args, **kwargs):
+    """Compatibility layer because python2.6"""
+    tf = tarfile.open(*args, **kwargs)
+    try:
+        yield tf
+    finally:
+        tf.close()
+
+
+@contextlib.contextmanager
+def tmpdir():
+    """Contextmanager to create a temporary directory.  It will be cleaned up
+    afterwards.
+    """
+    tempdir = tempfile.mkdtemp()
+    try:
+        yield tempdir
+    finally:
+        shutil.rmtree(tempdir)