__init__.py 文件源码

def make_incremental_build(name, basis="live"):
    """
    Archive a build, hard-linking unchanged files from the "basis" build (default live)

    This can significantly reduce the disk space used by multiple builds.

    On mac, requires ``brew install coreutils``
    """
    cp_bin = find_executable('gcp')
    if find_executable('gcp'):
        cp_bin = "gcp"
    else:
        cp_bin = "cp"

    live_name = dealias_build("_live")
    stage_name = dealias_build("_stage")
    if name in (live_name, stage_name):
        abort("Cannot turn the live or stage build into an incremental build")

    basis = dealias_build(basis)

    stop(name)

    with lcd("%s/deploy/builds" % ROOT_DIR):
        local("mv %(name)s %(name)s~" % {'name': name})
        with settings(hide("stderr"), warn_only=True):
            cp_ret = local("%(cp_bin)s -al %(basis)s %(name)s" % {
                'basis': basis,
                'name': name,
                'cp_bin': cp_bin,
            })
        if not cp_ret.succeeded:
            local("mv %(name)s~ %(name)s" % {'name': name})
            abort("Local cp bin does not support -l flag (on mac: brew install coreutils)")
        local("rsync -acH --delete %(name)s~/ %(name)s" % {'name': name})
        local("rm -rf %(name)s~" % {'name': name})