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# vim: set fileencoding=utf-8 : 

# 

# (C) 2011 Guido Guenther <agx@sigxcpu.org> 

#    This program is free software; you can redistribute it and/or modify 

#    it under the terms of the GNU General Public License as published by 

#    the Free Software Foundation; either version 2 of the License, or 

#    (at your option) any later version. 

# 

#    This program is distributed in the hope that it will be useful, 

#    but WITHOUT ANY WARRANTY; without even the implied warranty of 

#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 

#    GNU General Public License for more details. 

# 

#    You should have received a copy of the GNU General Public License 

#    along with this program; if not, write to the Free Software 

#    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 

"""Git fast import class""" 

 

import subprocess 

import time 

from gbp.errors import GbpError 

 

class FastImport(object): 

    """Add data to a git repository using I{git fast-import}""" 

    _bufsize = 1024 

 

    m_regular = 644 

    m_exec    = 755 

    m_symlink = 120000 

 

    def __init__(self, repo): 

        """ 

        @param repo: the git repository L{FastImport} acts on 

        @type repo: L{GitRepository} 

        """ 

        self._repo = repo 

        try: 

            self._fi = subprocess.Popen([ 'git', 'fast-import', '--quiet'], 

                                        stdin=subprocess.PIPE, cwd=repo.path) 

            self._out = self._fi.stdin 

        except OSError as err: 

            raise GbpError("Error spawning git fast-import: %s" % err) 

        except ValueError as err: 

            raise GbpError( 

                "Invalid argument when spawning git fast-import: %s" % err) 

 

    def _do_data(self, fd, size): 

        self._out.write("data %s\n" % size) 

        while True: 

            data = fd.read(self._bufsize) 

            self._out.write(data) 

            if len(data) != self._bufsize: 

                break 

        self._out.write("\n") 

 

    def _do_file(self, filename, mode, fd, size): 

        name = "/".join(filename.split('/')[1:]) 

        self._out.write("M %d inline %s\n" % (mode, name)) 

        self._do_data(fd, size) 

 

    def add_file(self, filename, fd, size, mode=m_regular): 

        """ 

        Add a file 

 

        @param filename: the name of the file to add 

        @type filename: C{str} 

        @param fd: stream to read data from 

        @type fd: C{File} like object 

        @param size: size of the file to add 

        @type size: C{int} 

        @param mode: file mode, default is L{FastImport.m_regular}. 

        @type mode: C{int} 

        """ 

        self._do_file(filename, mode, fd, size) 

 

    def add_symlink(self, linkname, linktarget): 

        """ 

        Add a symlink 

 

        @param linkname: the symbolic link's name 

        @param linkname: C{str} 

        @param linktarget: the target the symlink points to 

        @type linktarget: C{str} 

        """ 

        self._out.write("M %d inline %s\n" % (self.m_symlink, linkname)) 

        self._out.write("data %s\n" % len(linktarget)) 

        self._out.write("%s\n" % linktarget) 

 

    def start_commit(self, branch, committer, msg): 

        """ 

        Start a fast import commit 

 

        @param branch: branch to commit on 

        @type branch: C{str} 

        @param committer: the committer information 

        @type committer: L{GitModifier} 

        @param msg: the commit message 

        @type msg: C{str} 

        """ 

        length = len(msg) 

        if not committer.date: 

            committer.date = "%d %s" % (time.time(), 

                                        time.strftime("%z")) 

 

        if self._repo.has_branch(branch): 

            from_ = "from refs/heads/%(branch)s^0\n" 

        else: 

            from_ = '' 

 

        self._out.write("""commit refs/heads/%(branch)s 

committer %(name)s <%(email)s> %(time)s 

data %(length)s 

%(msg)s%(from)s""" % 

            { 'branch': branch, 

              'name':   committer.name, 

              'email':  committer.email, 

              'time':   committer.date, 

              'length': length, 

              'msg': msg, 

              'from': from_, 

              }) 

 

    def deleteall(self): 

        """ 

        Issue I{deleteall} to fastimport so we start from a empty tree 

        """ 

        self._out.write("deleteall\n") 

 

    def close(self): 

        """ 

        Close fast-import issuing all pending actions 

        """ 

        if self._out: 

            self._out.close() 

        if self._fi: 

            self._fi.wait() 

 

    def __del__(self): 

        self.close()