Synnefo » devflow

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import os

import git

import sh

import re

from collections import namedtuple

from configobj import ConfigObj

from devflow import BRANCH_TYPES

def get_repository(path=None):

    """Load the repository from the current working dir."""

    if path is None:

        path = os.getcwd()

    try:

        return git.Repo(path)

    except git.InvalidGitRepositoryError:

        msg = "Cound not retrivie git information. Directory '%s'"\

              " is not a git repository!" % path

        raise RuntimeError(msg)

def get_config(path=None):

    """Load configuration file."""

    if path is None:

        toplevel = get_vcs_info().toplevel

        path = os.path.join(toplevel, "devflow.conf")

    config = ConfigObj(path)

    return config

def get_vcs_info():

    """Return current git HEAD commit information.

    Returns a tuple containing

        - branch name

        - commit id

        - commit count

        - git describe output

        - path of git toplevel directory

    """

    repo = get_repository()

    branch = repo.head.reference

    revid = get_commit_id(branch.commit, branch)

    revno = len(list(repo.iter_commits()))

    toplevel = repo.working_dir

    info = namedtuple("vcs_info", ["branch", "revid", "revno",

                                   "toplevel"])

    return info(branch=branch.name, revid=revid, revno=revno,

                toplevel=toplevel)

def get_commit_id(commit, current_branch):

    """Return the commit ID

    If the commit is a 'merge' commit, and one of the parents is a

    debian branch we return a compination of the parents commits.

    """

    def short_id(commit):

        return commit.hexsha[0:7]

    parents = commit.parents

    cur_br_name = current_branch.name

    if len(parents) == 1:

        return short_id(commit)

    elif len(parents) == 2:

        if cur_br_name.startswith("debian-") or cur_br_name == "debian":

            pr1, pr2 = parents

            return short_id(pr1) + "_" + short_id(pr2)

        else:

            return short_id(commit)

    else:

        raise RuntimeError("Commit %s has more than 2 parents!" % commit)

def get_debian_branch(branch):

    """Find the corresponding debian- branch"""

    distribution = get_distribution_codename()

    repo = get_repository()

    if branch == "master":

        deb_branch = "debian-" + distribution

    else:

        deb_branch = "-".join(["debian", branch, distribution])

    # Check if debian-branch exists (local or origin)

    if _get_branch(deb_branch):

        return deb_branch

    # Check without distribution

    deb_branch = re.sub("-" + distribution + "$", "", deb_branch)

    if _get_branch(deb_branch):

        return deb_branch

    branch_type = BRANCH_TYPES[get_branch_type(branch)]

    # If not try the default debian branch with distribution

    default_branch = branch_type.debian_branch + "-" + distribution

    if _get_branch(default_branch):

        repo.git.branch(deb_branch, default_branch)

        print "Created branch '%s' from '%s'" % (deb_branch, default_branch)

        return deb_branch

    # And without distribution

    default_branch = branch_type.debian_branch

    if _get_branch(default_branch):

        repo.git.branch(deb_branch, default_branch)

        print "Created branch '%s' from '%s'" % (deb_branch, default_branch)

        return deb_branch

    # If not try the debian branch

    repo.git.branch(deb_branch, default_branch)

    print "Created branch '%s' from 'debian'" % deb_branch

    return "debian"

def _get_branch(branch):

    repo = get_repository()

    if branch in repo.branches:

        return branch

    origin_branch = "origin/" + branch

    if origin_branch in repo.refs:

        print "Creating branch '%s' to track '%s'" % (branch, origin_branch)

        repo.git.branch(branch, origin_branch)

        return branch

    else:

        return None

def get_build_mode():

    """Determine the build mode"""

    # Get it from environment if exists

    mode = os.environ.get("DEVFLOW_BUILD_MODE", None)

    if mode is None:

        branch = get_branch_type(get_vcs_info().branch)

        try:

            br_type = BRANCH_TYPES[get_branch_type(branch)]

        except KeyError:

            allowed_branches = ", ".join(x for x in BRANCH_TYPES.keys())

            raise ValueError("Malformed branch name '%s', cannot classify as"

                             " one of %s" % (branch, allowed_branches))

        mode = "snapshot" if br_type.builds_snapshot else "release"

    return mode

def normalize_branch_name(branch_name):

    """Normalize branch name by removing debian- if exists"""

    brnorm = branch_name

    if brnorm == "debian":

        brnorm = "debian-master"

    # If it's a debian branch, ignore starting "debian-"

    if brnorm.startswith("debian-"):

        brnorm = brnorm.replace("debian-", "", 1)

    return brnorm

def get_branch_type(branch_name):

    """Extract the type from a branch name"""

    branch_name = normalize_branch_name(branch_name)

    if "-" in branch_name:

        btypestr = branch_name.split("-")[0]

    else:

        btypestr = branch_name

    return btypestr

def version_to_tag(version):

    return version.replace("~", "")

def undebianize(branch):

    if branch == "debian":

        return "master"

    elif branch.startswith("debian-"):

        return branch.replace("debian-", "")

    else:

        return branch

def get_distribution_codename():

    output = sh.lsb_release("-c")

    _, codename = output.split("\t")

    codename = codename.strip()

    return codename