Convenience wrapper around rpm hdr class rpm hdr provides all the RPM

"""
Convenience wrapper around rpm.hdr class.

rpm.hdr provides all the RPM fields by the indexes defined in rpm module, which
is not convenient. This wrapper adds RpmHeader class with .field_name access to
the RPM header values.

Accessors are not generated on-the-fly, so dir(RpmHeader) and code completion in
interactive shell will work properly.
"""

class RpmHeader(object):
    def __init__(self, hdr):
        self.hdr = hdr

    def __repr__(self):
        if self.epoch:
            return "<RPM header %d:%s-%s.%s>" % (self.epoch, self.name, self.version, self.release)
        else:
            return "<RPM header %s-%s.%s>" % (self.name, self.version, self.release)

def _add_getter_to_rpmheader(name, value):
    def getter(self):
        return self.hdr[value]
    setattr(RpmHeader, name, property(getter))

def _populate_rpm_header_class():
    import rpm

    for tag in dir(rpm):
        if tag.startswith('RPMTAG_'):
            _add_getter_to_rpmheader(tag[7:].lower(), getattr(rpm, tag))

_populate_rpm_header_class()

def read_file(f):
    import rpm
    return map(RpmHeader, rpm.readHeaderListFromFile(f))