Merge branch 'js/rerere-forget-protect-against-NUL' into maint
[git] / git_remote_helpers / git / importer.py
1 import os
2 import subprocess
3
4 from git_remote_helpers.util import check_call, check_output
5
6
7 class GitImporter(object):
8     """An importer for testgit repositories.
9
10     This importer simply delegates to git fast-import.
11     """
12
13     def __init__(self, repo):
14         """Creates a new importer for the specified repo.
15         """
16
17         self.repo = repo
18
19     def get_refs(self, gitdir):
20         """Returns a dictionary with refs.
21
22         Note that the keys in the returned dictionary are byte strings as
23         read from git.
24         """
25         args = ["git", "--git-dir=" + gitdir, "for-each-ref", "refs/heads"]
26         lines = check_output(args).strip().split('\n'.encode('ascii'))
27         refs = {}
28         for line in lines:
29             value, name = line.split(' '.encode('ascii'))
30             name = name.strip('commit\t'.encode('ascii'))
31             refs[name] = value
32         return refs
33
34     def do_import(self, base):
35         """Imports a fast-import stream to the given directory.
36
37         Simply delegates to git fast-import.
38         """
39
40         dirname = self.repo.get_base_path(base)
41         if self.repo.local:
42             gitdir = self.repo.gitpath
43         else:
44             gitdir = os.path.abspath(os.path.join(dirname, '.git'))
45         path = os.path.abspath(os.path.join(dirname, 'testgit.marks'))
46
47         if not os.path.exists(dirname):
48             os.makedirs(dirname)
49
50         refs_before = self.get_refs(gitdir)
51
52         args = ["git", "--git-dir=" + gitdir, "fast-import", "--quiet", "--export-marks=" + path]
53
54         if os.path.exists(path):
55             args.append("--import-marks=" + path)
56
57         check_call(args)
58
59         refs_after = self.get_refs(gitdir)
60
61         changed = {}
62
63         for name, value in refs_after.iteritems():
64             if refs_before.get(name) == value:
65                 continue
66
67             changed[name] = value
68
69         return changed