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path: root/git_remote_helpers/git/importer.py
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import os
import subprocess
 
from git_remote_helpers.util import check_call, check_output
 
 
class GitImporter(object):
    """An importer for testgit repositories.
 
    This importer simply delegates to git fast-import.
    """
 
    def __init__(self, repo):
        """Creates a new importer for the specified repo.
        """
 
        self.repo = repo
 
    def get_refs(self, gitdir):
        """Returns a dictionary with refs.
        """
        args = ["git", "--git-dir=" + gitdir, "for-each-ref", "refs/heads"]
        lines = check_output(args).strip().split('\n')
        refs = {}
        for line in lines:
            value, name = line.split(' ')
            name = name.strip('commit\t')
            refs[name] = value
        return refs
 
    def do_import(self, base):
        """Imports a fast-import stream to the given directory.
 
        Simply delegates to git fast-import.
        """
 
        dirname = self.repo.get_base_path(base)
        if self.repo.local:
            gitdir = self.repo.gitpath
        else:
            gitdir = os.path.abspath(os.path.join(dirname, '.git'))
        path = os.path.abspath(os.path.join(dirname, 'git.marks'))
 
        if not os.path.exists(dirname):
            os.makedirs(dirname)
 
        refs_before = self.get_refs(gitdir)
 
        args = ["git", "--git-dir=" + gitdir, "fast-import", "--quiet", "--export-marks=" + path]
 
        if os.path.exists(path):
            args.append("--import-marks=" + path)
 
        check_call(args)
 
        refs_after = self.get_refs(gitdir)
 
        changed = {}
 
        for name, value in refs_after.iteritems():
            if refs_before.get(name) == value:
                continue
 
            changed[name] = value
 
        return changed