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[Xen-devel] [PATCH v2 14/27] tools/python: Conversion utility for legacy migration streams



This utility will take a legacy stream as in input, and produce a v2 stream as
an output.  It is exec()'d by libxl to provide backwards compatibility.

Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Acked-by: Ian Campbell <Ian.Campbell@xxxxxxxxxx>
CC: Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
CC: Wei Liu <wei.liu2@xxxxxxxxxx>
---
 tools/python/Makefile                      |    4 +
 tools/python/scripts/convert-legacy-stream |  678 ++++++++++++++++++++++++++++
 2 files changed, 682 insertions(+)
 create mode 100755 tools/python/scripts/convert-legacy-stream

diff --git a/tools/python/Makefile b/tools/python/Makefile
index e933be8..df942a7 100644
--- a/tools/python/Makefile
+++ b/tools/python/Makefile
@@ -17,9 +17,13 @@ build: genwrap.py $(XEN_ROOT)/tools/libxl/libxl_types.idl \
 
 .PHONY: install
 install:
+       $(INSTALL_DIR) $(DESTDIR)$(PRIVATE_BINDIR)
+
        CC="$(CC)" CFLAGS="$(PY_CFLAGS)" $(PYTHON) setup.py install \
                $(PYTHON_PREFIX_ARG) --root="$(DESTDIR)" --force
 
+       $(INSTALL_PROG) scripts/convert-legacy-stream 
$(DESTDIR)$(PRIVATE_BINDIR)
+
 .PHONY: test
 test:
        export LD_LIBRARY_PATH=$$(readlink -f ../libxc):$$(readlink -f 
../xenstore); $(PYTHON) test.py -b -u
diff --git a/tools/python/scripts/convert-legacy-stream 
b/tools/python/scripts/convert-legacy-stream
new file mode 100755
index 0000000..d54fa22
--- /dev/null
+++ b/tools/python/scripts/convert-legacy-stream
@@ -0,0 +1,678 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+"""
+Convert a legacy migration stream to a v2 stream.
+"""
+
+import sys
+import os, os.path
+import syslog
+import traceback
+
+from struct import calcsize, unpack, pack
+
+from xen.migration import legacy, public, libxc, libxl, xl
+
+__version__ = 1
+
+fin = None             # Input file/fd
+fout = None            # Output file/fd
+twidth = 0             # Legacy toolstack bitness (32 or 64)
+pv = None              # Boolean (pv or hvm)
+qemu = True            # Boolean - process qemu record?
+log_to_syslog = False  # Boolean - Log to syslog instead of stdout/err?
+verbose = False        # Boolean - Summarise stream contents
+
+def stream_read(_ = None):
+    """Read from the input"""
+    return fin.read(_)
+
+def stream_write(_):
+    """Write to the output"""
+    return fout.write(_)
+
+def info(msg):
+    """Info message, routed to appropriate destination"""
+    if verbose:
+        if log_to_syslog:
+            for line in msg.split("\n"):
+                syslog.syslog(syslog.LOG_INFO, line)
+        else:
+            print msg
+
+def err(msg):
+    """Error message, routed to appropriate destination"""
+    if log_to_syslog:
+        for line in msg.split("\n"):
+            syslog.syslog(syslog.LOG_ERR, line)
+    print >> sys.stderr, msg
+
+class StreamError(StandardError):
+    """Error with the incoming migration stream"""
+    pass
+
+class VM(object):
+    """Container of VM parameters"""
+
+    def __init__(self, fmt):
+        # Common
+        self.p2m_size = 0
+
+        # PV
+        self.max_vcpu_id = 0
+        self.online_vcpu_map = []
+        self.width = 0
+        self.levels = 0
+        self.basic_len = 0
+        self.extd = False
+        self.xsave_len = 0
+
+        # libxl
+        self.libxl = fmt == "libxl"
+        self.xenstore = [] # Deferred "toolstack" records
+
+def write_libxc_ihdr():
+    stream_write(pack(libxc.IHDR_FORMAT,
+                      libxc.IHDR_MARKER,  # Marker
+                      libxc.IHDR_IDENT,   # Ident
+                      libxc.IHDR_VERSION, # Version
+                      libxc.IHDR_OPT_LE,  # Options
+                      0, 0))              # Reserved
+
+def write_libxc_dhdr():
+    if pv:
+        dtype = libxc.DHDR_TYPE_x86_pv
+    else:
+        dtype = libxc.DHDR_TYPE_x86_hvm
+
+    stream_write(pack(libxc.DHDR_FORMAT,
+                      dtype,        # Type
+                      12,           # Page size
+                      0,            # Reserved
+                      0,            # Xen major (converted)
+                      __version__)) # Xen minor (converted)
+
+def write_libxl_hdr():
+    stream_write(pack(libxl.HDR_FORMAT,
+                      libxl.HDR_IDENT,     # Ident
+                      libxl.HDR_VERSION,   # Version 2
+                      libxl.HDR_OPT_LE |   # Options
+                      libxl.HDR_OPT_LEGACY # Little Endian and Legacy
+                      ))
+
+def write_record(rt, *argl):
+    alldata = ''.join(argl)
+    length = len(alldata)
+
+    record = pack(libxc.RH_FORMAT, rt, length) + alldata
+    plen = (8 - (length & 7)) & 7
+    record += '\x00' * plen
+
+    stream_write(record)
+
+def write_libxc_pv_info(vm):
+    write_record(libxc.REC_TYPE_x86_pv_info,
+                 pack(libxc.X86_PV_INFO_FORMAT,
+                      vm.width, vm.levels, 0, 0))
+
+def write_libxc_pv_p2m_frames(vm, pfns):
+    write_record(libxc.REC_TYPE_x86_pv_p2m_frames,
+                 pack(libxc.X86_PV_P2M_FRAMES_FORMAT,
+                      0, vm.p2m_size - 1),
+                 pack("Q" * len(pfns), *pfns))
+
+def write_libxc_pv_vcpu_basic(vcpu_id, data):
+    write_record(libxc.REC_TYPE_x86_pv_vcpu_basic,
+                 pack(libxc.X86_PV_VCPU_HDR_FORMAT, vcpu_id, 0), data)
+
+def write_libxc_pv_vcpu_extd(vcpu_id, data):
+    write_record(libxc.REC_TYPE_x86_pv_vcpu_extended,
+                 pack(libxc.X86_PV_VCPU_HDR_FORMAT, vcpu_id, 0), data)
+
+def write_libxc_pv_vcpu_xsave(vcpu_id, data):
+    write_record(libxc.REC_TYPE_x86_pv_vcpu_xsave,
+                 pack(libxc.X86_PV_VCPU_HDR_FORMAT, vcpu_id, 0), data)
+
+def write_page_data(pfns, pages):
+    if fout is None: # Save copying 1M buffers around for no reason
+        return
+
+    new_pfns = [(((x & 0xf0000000) << 32) | (x & 0x0fffffff)) for x in pfns]
+
+    # Optimise the needless buffer copying in write_record()
+    stream_write(pack(libxc.RH_FORMAT,
+                      libxc.REC_TYPE_page_data,
+                      8 + (len(new_pfns) * 8) + len(pages)))
+    stream_write(pack(libxc.PAGE_DATA_FORMAT, len(new_pfns), 0))
+    stream_write(pack("Q" * len(new_pfns), *new_pfns))
+    stream_write(pages)
+
+def write_libxc_tsc_info(mode, khz, nsec, incarn):
+    write_record(libxc.REC_TYPE_tsc_info,
+                 pack(libxc.TSC_INFO_FORMAT,
+                      mode, khz, nsec, incarn, 0))
+
+def write_libxc_hvm_params(params):
+    if pv:
+        raise StreamError("HVM-only param in PV stream")
+    elif len(params) % 2:
+        raise RuntimeError("Expected even length list of hvm parameters")
+
+    write_record(libxc.REC_TYPE_hvm_params,
+                 pack(libxc.HVM_PARAMS_FORMAT, len(params) / 2, 0),
+                 pack("Q" * len(params), *params))
+
+def write_libxl_end():
+    write_record(libxl.REC_TYPE_end, "")
+
+def write_libxl_libxc_context():
+    write_record(libxl.REC_TYPE_libxc_context, "")
+
+def write_libxl_xenstore_data(data):
+    write_record(libxl.REC_TYPE_xenstore_data, data)
+
+def write_libxl_emulator_context(blob):
+    write_record(libxl.REC_TYPE_emulator_context,
+                 pack(libxl.EMULATOR_CONTEXT_FORMAT,
+                      libxl.EMULATOR_ID_unknown, 0) + blob)
+
+def rdexact(nr_bytes):
+    """Read exactly nr_bytes from fin"""
+    _ = stream_read(nr_bytes)
+    if len(_) != nr_bytes:
+        raise IOError("Stream truncated")
+    return _
+
+def unpack_exact(fmt):
+    """Unpack a format from fin"""
+    sz = calcsize(fmt)
+    return unpack(fmt, rdexact(sz))
+
+def unpack_ulongs(nr_ulongs):
+    if twidth == 32:
+        return unpack_exact("I" * nr_ulongs)
+    else:
+        return unpack_exact("Q" * nr_ulongs)
+
+def read_pv_extended_info(vm):
+
+    marker, = unpack_ulongs(1)
+
+    if twidth == 32:
+        expected = 0xffffffff
+    else:
+        expected = 0xffffffffffffffff
+
+    if marker != expected:
+        raise StreamError("Unexpected extended info marker 0x%x" % (marker, ))
+
+    total_length, = unpack_exact("I")
+    so_far = 0
+
+    info("Extended Info: length 0x%x" % (total_length, ))
+
+    while so_far < total_length:
+
+        blkid, datasz = unpack_exact("=4sI")
+        so_far += 8
+
+        info("  Record type: %s, size 0x%x" % (blkid, datasz))
+
+        data = rdexact(datasz)
+        so_far += datasz
+
+        # Eww, but this is how it is done :(
+        if blkid == "vcpu":
+
+            vm.basic_len = datasz
+
+            if datasz == 0x1430:
+                vm.width = 8
+                vm.levels = 4
+                info("    64bit domain, 4 levels")
+            elif datasz == 0xaf0:
+                vm.width = 4
+                vm.levels = 3
+                info("    32bit domain, 3 levels")
+            else:
+                raise StreamError("Unable to determine guest width/level")
+
+            write_libxc_pv_info(vm)
+
+        elif blkid == "extv":
+            vm.extd = True
+
+        elif blkid == "xcnt":
+            vm.xsave_len, = unpack("I", data[:4])
+            info("xcnt sz 0x%x" % (vm.xsave_len, ))
+
+        else:
+            raise StreamError("Unrecognised extended block")
+
+
+    if so_far != total_length:
+        raise StreamError("Overshot Extended Info size by %d bytes"
+                          % (so_far - total_length,))
+
+def read_pv_p2m_frames(vm):
+    fpp = 4096 / vm.width
+    p2m_frame_len = (vm.p2m_size - 1) / fpp + 1
+
+    info("P2M frames: fpp %d, p2m_frame_len %d" % (fpp, p2m_frame_len))
+    write_libxc_pv_p2m_frames(vm, unpack_ulongs(p2m_frame_len))
+
+def read_pv_tail(vm):
+
+    nr_unmapped_pfns, = unpack_exact("I")
+
+    if nr_unmapped_pfns != 0:
+        # "Unmapped" pfns are bogus
+        _ = unpack_ulongs(nr_unmapped_pfns)
+        info("discarding %d bogus 'unmapped pfns'" % (nr_unmapped_pfns, ))
+
+    for vcpu_id in vm.online_vcpu_map:
+
+        basic = rdexact(vm.basic_len)
+        info("Got VCPU basic (size 0x%x)" % (vm.basic_len, ))
+        write_libxc_pv_vcpu_basic(vcpu_id, basic)
+
+        if vm.extd:
+            extd = rdexact(128)
+            info("Got VCPU extd (size 0x%x)" % (128, ))
+            write_libxc_pv_vcpu_extd(vcpu_id, extd)
+
+        if vm.xsave_len:
+            mask, size = unpack_exact("QQ")
+            assert vm.xsave_len - 16 == size
+
+            xsave = rdexact(size)
+            info("Got VCPU xsave (mask 0x%x, size 0x%x)" % (mask, size))
+            write_libxc_pv_vcpu_xsave(vcpu_id, xsave)
+
+    shinfo = rdexact(4096)
+    info("Got shinfo")
+
+    write_record(libxc.REC_TYPE_shared_info, shinfo)
+    write_record(libxc.REC_TYPE_end, "")
+
+
+def read_chunks(vm):
+
+    hvm_params = []
+
+    while True:
+
+        marker, = unpack_exact("=i")
+        if marker <= 0:
+            info("Chunk: %d - %s" %
+                 (marker, legacy.chunk_type_to_str.get(marker, "unknown")))
+
+        if marker == legacy.CHUNK_end:
+            info("  End")
+
+            if hvm_params:
+                write_libxc_hvm_params(hvm_params)
+
+            return
+
+        elif marker > 0:
+
+            if marker > legacy.MAX_BATCH:
+                raise StreamError("Page batch (%d) exceeded MAX_BATCH (%d)"
+                                  % (marker, legacy.MAX_BATCH))
+            pfns = unpack_ulongs(marker)
+
+            # xc_domain_save() leaves many XEN_DOMCTL_PFINFO_XTAB records for
+            # sequences of pfns it cant map.  Drop these.
+            pfns = [ x for x in pfns if x != 0xf0000000 ]
+
+            if len(set(pfns)) != len(pfns):
+                raise StreamError("Duplicate pfns in batch")
+
+            nr_pages = len([x for x in pfns if (x & 0xf0000000) < 0xd0000000])
+            pages = rdexact(nr_pages * 4096)
+
+            write_page_data(pfns, pages)
+
+        elif marker == legacy.CHUNK_enable_verify_mode:
+            # For debugging purposes only.  Will not be seen in real migration
+            raise RuntimeError("Unable to convert a debug stream")
+
+        elif marker == legacy.CHUNK_vcpu_info:
+            max_id, = unpack_exact("i")
+
+            if max_id > legacy.MAX_VCPU_ID:
+                raise StreamError("Vcpu max_id out of range: %d > %d"
+                                  % (max_id, legacy.MAX_VCPU_ID))
+
+            vm.max_vcpu_id = max_id
+            bitmap = unpack_exact("Q" * ((max_id/64) + 1))
+
+            for idx, word in enumerate(bitmap):
+                bit_idx = 0
+
+                while word > 0:
+                    if word & 1:
+                        vm.online_vcpu_map.append((idx * 64) + bit_idx)
+
+                    bit_idx += 1
+                    word >>= 1
+
+            info("  Vcpu info: max_id %d, online map %s"
+                 % (vm.max_vcpu_id, vm.online_vcpu_map))
+
+        elif marker == legacy.CHUNK_hvm_ident_pt:
+            _, ident_pt = unpack_exact("=IQ")
+            info("  EPT Identity Pagetable: 0x%x" % (ident_pt, ))
+            hvm_params.extend([public.HVM_PARAM_IDENT_PT, ident_pt])
+
+        elif marker == legacy.CHUNK_hvm_vm86_tss:
+            _, vm86_tss = unpack_exact("=IQ")
+            info("  VM86 TSS: 0x%x" % (vm86_tss, ))
+            hvm_params.extend([public.HVM_PARAM_VM86_TSS, vm86_tss])
+
+        elif marker == legacy.CHUNK_tmem:
+            raise RuntimeError("todo")
+
+        elif marker == legacy.CHUNK_tmem_extra:
+            raise RuntimeError("todo")
+
+        elif marker == legacy.CHUNK_tsc_info:
+            mode, nsec, khz, incarn = unpack_exact("=IQII")
+            info("  TSC_INFO: mode %s, %d ns, %d khz, %d incarn"
+                 % (mode, nsec, khz, incarn))
+            write_libxc_tsc_info(mode, khz, nsec, incarn)
+
+        elif marker == legacy.CHUNK_hvm_console_pfn:
+            _, console_pfn = unpack_exact("=IQ")
+            info("  Console pfn: 0x%x" % (console_pfn, ))
+            hvm_params.extend([public.HVM_PARAM_CONSOLE_PFN, console_pfn])
+
+        elif marker == legacy.CHUNK_last_checkpoint:
+            info("  Last Checkpoint")
+            # Nothing to do
+
+        elif marker == legacy.CHUNK_hvm_acpi_ioports_location:
+            _, loc = unpack_exact("=IQ")
+            info("  ACPI ioport location: 0x%x" % (loc, ))
+            hvm_params.extend([public.HVM_PARAM_ACPI_IOPORTS_LOCATION, loc])
+
+        elif marker == legacy.CHUNK_hvm_viridian:
+            _, loc = unpack_exact("=IQ")
+            info("  Viridian location: 0x%x" % (loc, ))
+            hvm_params.extend([public.HVM_PARAM_VIRIDIAN, loc])
+
+        elif marker == legacy.CHUNK_compressed_data:
+            sz, = unpack_exact("I")
+            data = rdexact(sz)
+            info("  Compressed Data: sz 0x%x" % (sz, ))
+            raise RuntimeError("todo")
+
+        elif marker == legacy.CHUNK_enable_compression:
+            raise RuntimeError("todo")
+
+        elif marker == legacy.CHUNK_hvm_generation_id_addr:
+            _, genid_loc = unpack_exact("=IQ")
+            info("  Generation ID Address: 0x%x" % (genid_loc, ))
+            hvm_params.extend(
+                [public.HVM_PARAM_VM_GENERATION_ID_ADDR, genid_loc])
+
+        elif marker == legacy.CHUNK_hvm_paging_ring_pfn:
+            _, pfn = unpack_exact("=IQ")
+            info("  Paging ring pfn: 0x%x" % (pfn, ))
+            hvm_params.extend([public.HVM_PARAM_PAGING_RING_PFN, pfn])
+
+        elif marker == legacy.CHUNK_hvm_monitor_ring_pfn:
+            _, pfn = unpack_exact("=IQ")
+            info("  Monitor ring pfn: 0x%x" % (pfn, ))
+            hvm_params.extend([public.HVM_PARAM_MONITOR_RING_PFN, pfn])
+
+        elif marker == legacy.CHUNK_hvm_sharing_ring_pfn:
+            _, pfn = unpack_exact("=IQ")
+            info("  Sharing ring pfn: 0x%x" % (pfn, ))
+            hvm_params.extend([public.HVM_PARAM_SHARING_RING_PFN, pfn])
+
+        elif marker == legacy.CHUNK_toolstack:
+            sz, = unpack_exact("I")
+
+            if sz:
+                data = rdexact(sz)
+                info("  Toolstack Data: sz 0x%x" % (sz, ))
+
+                if vm.libxl:
+                    vm.xenstore.append(data)
+                else:
+                    info("    Discarding")
+
+        elif marker == legacy.CHUNK_hvm_ioreq_server_pfn:
+            _, pfn = unpack_exact("=IQ")
+            info("  IOREQ server pfn: 0x%x" % (pfn, ))
+            hvm_params.extend([public.HVM_PARAM_IOREQ_SERVER_PFN, pfn])
+
+        elif marker == legacy.CHUNK_hvm_nr_ioreq_server_pages:
+            _, nr_pages = unpack_exact("=IQ")
+            info("  IOREQ server pages: %d" % (nr_pages, ))
+            hvm_params.extend(
+                [public.HVM_PARAM_NR_IOREQ_SERVER_PAGES, nr_pages])
+
+        else:
+            raise StreamError("Unrecognised chunk %d" % (marker,))
+
+def read_hvm_tail(vm):
+
+    io, bufio, store = unpack_exact("QQQ")
+    info("Magic pfns: 0x%x 0x%x 0x%x" % (io, bufio, store))
+    write_libxc_hvm_params([public.HVM_PARAM_IOREQ_PFN,    io,
+                            public.HVM_PARAM_BUFIOREQ_PFN, bufio,
+                            public.HVM_PARAM_STORE_PFN,    store])
+
+    blobsz, = unpack_exact("I")
+    info("Got HVM Context (0x%x bytes)" % (blobsz, ))
+    blob = rdexact(blobsz)
+
+    write_record(libxc.REC_TYPE_hvm_context, blob)
+    write_record(libxc.REC_TYPE_end, "")
+
+
+
+def read_qemu(vm):
+
+    rawsig = rdexact(21)
+    sig, = unpack("21s", rawsig)
+    info("Qemu signature: %s" % (sig, ))
+
+    if sig == "DeviceModelRecord0002":
+        rawsz = rdexact(4)
+        sz, = unpack("I", rawsz)
+        qdata = rdexact(sz)
+
+        if vm.libxl:
+            write_libxl_emulator_context(qdata)
+        else:
+            stream_write(rawsig)
+            stream_write(rawsz)
+            stream_write(qdata)
+
+    else:
+        raise RuntimeError("Unrecognised Qemu sig '%s'" % (sig, ))
+
+
+def skip_xl_header(fmt):
+    """Skip over an xl header in the stream"""
+
+    hdr = rdexact(len(xl.MAGIC))
+    if hdr != xl.MAGIC:
+        raise StreamError("No xl header")
+
+    byteorder, mflags, oflags, optlen = unpack_exact(xl.HEADER_FORMAT)
+
+    if fmt == "libxl":
+        mflags |= xl.MANDATORY_FLAG_STREAMV2
+
+    opts = pack(xl.HEADER_FORMAT, byteorder, mflags, oflags, optlen)
+
+    optdata = rdexact(optlen)
+
+    info("Processed xl header")
+
+    stream_write(hdr)
+    stream_write(opts)
+    stream_write(optdata)
+
+def read_legacy_stream(vm):
+
+    try:
+        vm.p2m_size, = unpack_ulongs(1)
+        info("P2M Size: 0x%x" % (vm.p2m_size,))
+
+        if vm.libxl:
+            write_libxl_hdr()
+            write_libxl_libxc_context()
+
+        write_libxc_ihdr()
+        write_libxc_dhdr()
+
+        if pv:
+            read_pv_extended_info(vm)
+            read_pv_p2m_frames(vm)
+
+        read_chunks(vm)
+
+        if pv:
+            read_pv_tail(vm)
+        else:
+            read_hvm_tail(vm)
+
+        if vm.libxl:
+            for rec in vm.xenstore:
+                write_libxl_xenstore_data(rec)
+
+        if not pv and (vm.libxl or qemu):
+            read_qemu(vm)
+
+        if vm.libxl:
+            write_libxl_end()
+
+    except (IOError, StreamError):
+        err("Stream Error:")
+        err(traceback.format_exc())
+        return 1
+
+    except RuntimeError:
+        err("Script Error:")
+        err(traceback.format_exc())
+        err("Please fix me")
+        return 2
+    return 0
+
+def open_file_or_fd(val, mode):
+    """
+    If 'val' looks like a decimal integer, open it as an fd.  If not, try to
+    open it as a regular file.
+    """
+
+    fd = -1
+    try:
+        # Does it look like an integer?
+        try:
+            fd = int(val, 10)
+        except ValueError:
+            pass
+
+        # Try to open it...
+        if fd != -1:
+            return os.fdopen(fd, mode, 0)
+        else:
+            return open(val, mode, 0)
+
+    except StandardError, e:
+        if fd != -1:
+            err("Unable to open fd %d: %s: %s" %
+                (fd, e.__class__.__name__, e))
+        else:
+            err("Unable to open file '%s': %s: %s" %
+                (val, e.__class__.__name__, e))
+
+    raise SystemExit(1)
+
+
+def main():
+    from optparse import OptionParser
+    global fin, fout, twidth, pv, qemu, verbose
+
+    # Change stdout to be line-buffered.
+    sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 1)
+
+    parser = OptionParser(version = __version__,
+                          usage = ("%prog [options] -i INPUT -o OUTPUT"
+                                   " -w WIDTH -g GUEST"),
+                          description =
+                          "Convert a legacy stream to a v2 stream")
+
+    # Required options
+    parser.add_option("-i", "--in", dest = "fin", metavar = "<FD or FILE>",
+                      help = "Legacy input to convert")
+    parser.add_option("-o", "--out", dest = "fout", metavar = "<FD or FILE>",
+                      help = "v2 format output")
+    parser.add_option("-w", "--width", dest = "twidth",
+                      metavar = "<32/64>", choices = ["32", "64"],
+                      help = "Legacy toolstack bitness")
+    parser.add_option("-g", "--guest-type", dest = "gtype",
+                      metavar = "<pv/hvm>", choices = ["pv", "hvm"],
+                      help = "Type of guest in stream")
+
+    # Optional options
+    parser.add_option("-f", "--format", dest = "format",
+                      metavar = "<libxc|libxl>", default = "libxc",
+                      choices = ["libxc", "libxl"],
+                      help = "Desired format of the outgoing stream " \
+                          "(defaults to libxc)")
+    parser.add_option("-v", "--verbose", action = "store_true", default = 
False,
+                      help = "Summarise stream contents")
+    parser.add_option("-x", "--xl", action = "store_true", default = False,
+                      help = ("Is an `xl` header present in the stream?"
+                              " (default no)"))
+    parser.add_option("--skip-qemu", action = "store_true", default = False,
+                      help = ("Skip processing of the qemu tail?"
+                              " (default no)"))
+    parser.add_option("--syslog", action = "store_true", default = False,
+                      help = "Log to syslog instead of stdout")
+
+    opts, _ = parser.parse_args()
+
+    if (opts.fin is None or opts.fout is None or
+        opts.twidth is None or opts.gtype is None):
+
+        parser.print_help(sys.stderr)
+        raise SystemExit(1)
+
+    if opts.syslog:
+        global log_to_syslog
+
+        syslog.openlog("convert-legacy-stream", syslog.LOG_PID)
+        log_to_syslog = True
+
+    fin     = open_file_or_fd(opts.fin,  "rb")
+    fout    = open_file_or_fd(opts.fout, "wb")
+    twidth  = int(opts.twidth)
+    pv      = opts.gtype == "pv"
+    verbose = opts.verbose
+    if opts.skip_qemu:
+        qemu = False
+
+    if opts.xl:
+        skip_xl_header(opts.format)
+
+    rc = read_legacy_stream(VM(opts.format))
+    fout.close()
+
+    return rc
+
+if __name__ == "__main__":
+    try:
+        sys.exit(main())
+    except SystemExit, e:
+        sys.exit(e.code)
+    except KeyboardInterrupt:
+        sys.exit(1)
-- 
1.7.10.4


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