#! /usr/bin/python
# Copyright (C) 2007 - 2010 by Intevation GmbH
# Authors:
# Bernhard Herzog <bh@intevation.de>
# Bjoern Ricks    <bjoern.ricks@intevation.de>
#
# This program is free software under the GPL (>=v2)
# Read the file COPYING coming with the software for details.

import os.path

import util
from treepkg.run import call, capture_output
from treepkg.cmdexpand import cmdexpand

def remove_trailing_slashes(s):
    return s.rstrip("/")

def expand_filename(filename):
    """
    Applies os.path.expanduser and os.path.expandvars to filename
    """
    return os.path.expandvars(os.path.expanduser(filename))

def prefix_for_remote_command(user, host):
    """Returns the ssh call needed to run a command on a remote host.
    If host is empty, the function assumes the command is to be run on
    the local host as the same user that exectutes this function, so
    that no ssh or other call is needed.
    """
    prefix = []
    if host:
        prefix.extend(["ssh", "%s@%s" % (user, host)])
    return prefix

def copy_arch_to_publishdir(variables, dist, section, arch=None, quiet=False,
                            create=True):
    if not arch:
        cachedir = variables["cachedir"]
    else:
        cachedir = os.path.join(variables["cachedir"], arch)

    # if cachedir does not exist rsync will fail therefore
    # it must be created or skipped. if it is created remote
    # content will be deleted
    if not os.path.exists(cachedir):
        if create:
            util.ensure_directory(cachedir)
        else:
            return

    destdir = os.path.join(variables["publish_dir"], dist, section)
    remote_destdir = destdir
    if variables["publish_host"]:
        remote_destdir = (("%(publish_user)s@%(publish_host)s:" % variables)
                          + remote_destdir)
    runremote = prefix_for_remote_command(variables["publish_user"],
                                          variables["publish_host"])

    call(cmdexpand("@runremote mkdir --parents $destdir",
                   runremote=runremote, destdir=destdir, **variables))
    rsync_flags = []
    if variables["publish_remove_old_packages"]:
        rsync_flags.append("--delete")
    if quiet:
        rsync_flags.append("--quiet")
    cmd = cmdexpand("rsync @rsync_flags -r --perms --times --omit-dir-times"  
                   " $cachedir $remote_destdir/",
                   rsync_flags=rsync_flags, remote_destdir=remote_destdir,
                   cachedir=cachedir)
    #print "rsync cmd: %s" % cmd
    call(cmd)



def copy_to_publishdir(variables, dist, section, arch=None, quiet=False):
    if not arch:
        destdir = os.path.join(variables["publish_dir"], dist, section)
    else:
        destdir = os.path.join(variables["publish_dir"], dist, section, arch)
    remote_destdir = destdir
    if variables["publish_host"]:
        remote_destdir = (("%(publish_user)s@%(publish_host)s:" % variables)
                          + remote_destdir)
    runremote = prefix_for_remote_command(variables["publish_user"],
                                          variables["publish_host"])

    call(cmdexpand("@runremote mkdir --parents $destdir",
                   runremote=runremote, destdir=destdir, **variables))
    rsync_flags = []
    if variables["publish_remove_old_packages"]:
        rsync_flags.append("--delete")
    if quiet:
        rsync_flags.append("--quiet")
    call(cmdexpand("rsync @rsync_flags -r --perms --times --omit-dir-times"  
                   " $cachedir/ $remote_destdir/",
                   rsync_flags=rsync_flags, remote_destdir=remote_destdir,
                   **variables))