summaryrefslogtreecommitdiff
path: root/git-remote-testgit.py
blob: e4a99a33eff4affccb32ceac08296decf02cc8ec (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
#!/usr/bin/env python

# hashlib is only available in python >= 2.5
try:
    import hashlib
    _digest = hashlib.sha1
except ImportError:
    import sha
    _digest = sha.new
import sys
import os
sys.path.insert(0, os.getenv("GITPYTHONLIB","."))

from git_remote_helpers.util import die, debug, warn
from git_remote_helpers.git.repo import GitRepo
from git_remote_helpers.git.exporter import GitExporter
from git_remote_helpers.git.importer import GitImporter
from git_remote_helpers.git.non_local import NonLocalGit

def get_repo(alias, url):
    """Returns a git repository object initialized for usage.
    """

    repo = GitRepo(url)
    repo.get_revs()
    repo.get_head()

    hasher = _digest()
    hasher.update(repo.path)
    repo.hash = hasher.hexdigest()

    repo.get_base_path = lambda base: os.path.join(
        base, 'info', 'fast-import', repo.hash)

    prefix = 'refs/testgit/%s/' % alias
    debug("prefix: '%s'", prefix)

    repo.gitdir = ""
    repo.alias = alias
    repo.prefix = prefix

    repo.exporter = GitExporter(repo)
    repo.importer = GitImporter(repo)
    repo.non_local = NonLocalGit(repo)

    return repo


def local_repo(repo, path):
    """Returns a git repository object initalized for usage.
    """

    local = GitRepo(path)

    local.non_local = None
    local.gitdir = repo.gitdir
    local.alias = repo.alias
    local.prefix = repo.prefix
    local.hash = repo.hash
    local.get_base_path = repo.get_base_path
    local.exporter = GitExporter(local)
    local.importer = GitImporter(local)

    return local


def do_capabilities(repo, args):
    """Prints the supported capabilities.
    """

    print "import"
    print "export"
    print "gitdir"
    print "refspec refs/heads/*:%s*" % repo.prefix

    print # end capabilities


def do_list(repo, args):
    """Lists all known references.

    Bug: This will always set the remote head to master for non-local
    repositories, since we have no way of determining what the remote
    head is at clone time.
    """

    for ref in repo.revs:
        debug("? refs/heads/%s", ref)
        print "? refs/heads/%s" % ref

    if repo.head:
        debug("@refs/heads/%s HEAD" % repo.head)
        print "@refs/heads/%s HEAD" % repo.head
    else:
        debug("@refs/heads/master HEAD")
        print "@refs/heads/master HEAD"

    print # end list


def update_local_repo(repo):
    """Updates (or clones) a local repo.
    """

    if repo.local:
        return repo

    path = repo.non_local.clone(repo.gitdir)
    repo.non_local.update(repo.gitdir)
    repo = local_repo(repo, path)
    return repo


def do_import(repo, args):
    """Exports a fast-import stream from testgit for git to import.
    """

    if len(args) != 1:
        die("Import needs exactly one ref")

    if not repo.gitdir:
        die("Need gitdir to import")

    repo = update_local_repo(repo)
    repo.exporter.export_repo(repo.gitdir, args)


def do_export(repo, args):
    """Imports a fast-import stream from git to testgit.
    """

    if not repo.gitdir:
        die("Need gitdir to export")

    dirname = repo.get_base_path(repo.gitdir)

    if not os.path.exists(dirname):
        os.makedirs(dirname)

    path = os.path.join(dirname, 'testgit.marks')
    print path
    if os.path.exists(path):
        print path
    else:
        print ""
    sys.stdout.flush()

    update_local_repo(repo)
    repo.importer.do_import(repo.gitdir)
    repo.non_local.push(repo.gitdir)


def do_gitdir(repo, args):
    """Stores the location of the gitdir.
    """

    if not args:
        die("gitdir needs an argument")

    repo.gitdir = ' '.join(args)


COMMANDS = {
    'capabilities': do_capabilities,
    'list': do_list,
    'import': do_import,
    'export': do_export,
    'gitdir': do_gitdir,
}


def sanitize(value):
    """Cleans up the url.
    """

    if value.startswith('testgit::'):
        value = value[9:]

    return value


def read_one_line(repo):
    """Reads and processes one command.
    """

    line = sys.stdin.readline()

    cmdline = line

    if not cmdline:
        warn("Unexpected EOF")
        return False

    cmdline = cmdline.strip().split()
    if not cmdline:
        # Blank line means we're about to quit
        return False

    cmd = cmdline.pop(0)
    debug("Got command '%s' with args '%s'", cmd, ' '.join(cmdline))

    if cmd not in COMMANDS:
        die("Unknown command, %s", cmd)

    func = COMMANDS[cmd]
    func(repo, cmdline)
    sys.stdout.flush()

    return True


def main(args):
    """Starts a new remote helper for the specified repository.
    """

    if len(args) != 3:
        die("Expecting exactly three arguments.")
        sys.exit(1)

    if os.getenv("GIT_DEBUG_TESTGIT"):
        import git_remote_helpers.util
        git_remote_helpers.util.DEBUG = True

    alias = sanitize(args[1])
    url = sanitize(args[2])

    if not alias.isalnum():
        warn("non-alnum alias '%s'", alias)
        alias = "tmp"

    args[1] = alias
    args[2] = url

    repo = get_repo(alias, url)

    debug("Got arguments %s", args[1:])

    more = True

    while (more):
        more = read_one_line(repo)

if __name__ == '__main__':
    sys.exit(main(sys.argv))