/usr/lib/xen-4.4/bin/pygrub is in xen-utils-4.4 4.4.0-0ubuntu5.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 | #! /usr/bin/python2.7
#
# pygrub - simple python-based bootloader for Xen
#
# Copyright 2005-2006 Red Hat, Inc.
# Jeremy Katz <katzj@redhat.com>
#
# This software may be freely redistributed under the terms of the GNU
# general public license.
#
# 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., 675 Mass Ave, Cambridge, MA 02139, USA.
#
import os, sys, string, struct, tempfile, re, traceback
import copy
import logging
import platform
import curses, _curses, curses.wrapper, curses.textpad, curses.ascii
import getopt
sys.path.insert(1, sys.path[0] + '/../lib/python')
import fsimage
import grub.GrubConf
import grub.LiloConf
import grub.ExtLinuxConf
PYGRUB_VER = 0.6
FS_READ_MAX = 1024 * 1024
def enable_cursor(ison):
if ison:
val = 2
else:
val = 0
try:
curses.curs_set(val)
except _curses.error:
pass
DISK_TYPE_RAW, DISK_TYPE_HYBRIDISO, DISK_TYPE_DOS = range(3)
def identify_disk_image(file):
"""Detect DOS partition table or HybridISO format."""
fd = os.open(file, os.O_RDONLY)
buf = os.read(fd, 0x8006)
os.close(fd)
if len(buf) >= 512 and \
struct.unpack("H", buf[0x1fe: 0x200]) == (0xaa55,):
# HybridISO contains a DOS partition table for booting from USB devices, but really is an ISO image
if len(buf) >= 0x8006 and buf[0x8001:0x8006] == 'CD001':
return DISK_TYPE_HYBRIDISO
return DISK_TYPE_DOS
return DISK_TYPE_RAW
SECTOR_SIZE=512
DK_LABEL_LOC=1
DKL_MAGIC=0xdabe
V_ROOT=0x2
def get_solaris_slice(file, offset):
"""Find the root slice in a Solaris VTOC."""
fd = os.open(file, os.O_RDONLY)
os.lseek(fd, offset + (DK_LABEL_LOC * SECTOR_SIZE), 0)
buf = os.read(fd, 512)
os.close(fd)
if struct.unpack("<H", buf[508:510])[0] != DKL_MAGIC:
raise RuntimeError, "Invalid disklabel magic"
nslices = struct.unpack("<H", buf[30:32])[0]
for i in range(nslices):
sliceoff = 72 + 12 * i
slicetag = struct.unpack("<H", buf[sliceoff:sliceoff+2])[0]
slicesect = struct.unpack("<L", buf[sliceoff+4:sliceoff+8])[0]
if slicetag == V_ROOT:
return slicesect * SECTOR_SIZE
raise RuntimeError, "No root slice found"
def get_fs_offset_gpt(file):
fd = os.open(file, os.O_RDONLY)
os.lseek(fd, SECTOR_SIZE, 0)
buf = os.read(fd, 512)
partcount = struct.unpack("<L", buf[80:84])[0]
partsize = struct.unpack("<L", buf[84:88])[0]
i = partcount
offsets = []
while i>0:
buf = os.read(fd, partsize)
offsets.append(struct.unpack("<Q", buf[32:40])[0] * SECTOR_SIZE)
i -= 1
os.close(fd)
return offsets
FDISK_PART_SOLARIS=0xbf
FDISK_PART_SOLARIS_OLD=0x82
FDISK_PART_GPT=0xee
def get_partition_offsets(file):
image_type = identify_disk_image(file)
if image_type == DISK_TYPE_RAW:
# No MBR: assume whole disk filesystem, which is like a
# single partition starting at 0
return [0]
elif image_type == DISK_TYPE_HYBRIDISO:
# A HybridISO contains an ISO filesystem at 0 in addition
# to the DOS partition table
part_offs = [0]
elif image_type == DISK_TYPE_DOS:
part_offs = []
else:
raise ValueError('Unhandled image type returnd by identify_disk_image(): %d' % (image_type,))
fd = os.open(file, os.O_RDONLY)
buf = os.read(fd, 512)
os.close(fd)
for poff in (446, 462, 478, 494): # partition offsets
# MBR contains a 16 byte descriptor per partition
partbuf = buf[poff:poff+16]
offset = struct.unpack("<L", partbuf[8:12])[0] * SECTOR_SIZE
type = struct.unpack("<B", partbuf[4:5])[0]
# offset == 0 implies this partition is not enabled
if offset == 0:
continue
if type == FDISK_PART_SOLARIS or type == FDISK_PART_SOLARIS_OLD:
try:
offset += get_solaris_slice(file, offset)
except RuntimeError:
continue # no solaris magic at that offset, ignore partition
if type == FDISK_PART_GPT:
for offset in get_fs_offset_gpt(file):
part_offs.append(offset)
break
# Active partition has 0x80 as the first byte.
# If active, prepend to front of list, otherwise append to back.
if struct.unpack("<c", buf[poff:poff+1]) == ('\x80',):
part_offs.insert(0, offset)
else:
part_offs.append(offset)
return part_offs
class GrubLineEditor(curses.textpad.Textbox):
def __init__(self, screen, startx, starty, line = ""):
screen.addstr(startx, starty, "> ")
screen.noutrefresh()
win = curses.newwin(1, 74, startx, starty + 2)
curses.textpad.Textbox.__init__(self, win)
self.line = list(line)
self.pos = len(line)
self.cancelled = False
self.show_text()
def show_text(self):
"""Show the text. One of our advantages over standard textboxes
is that we can handle lines longer than the window."""
self.win.erase()
p = self.pos
off = 0
while p > 70:
p -= 55
off += 55
l = self.line[off:off+70]
self.win.addstr(0, 0, string.join(l, ("")))
if self.pos > 70:
self.win.addch(0, 0, curses.ACS_LARROW)
self.win.move(0, p)
def do_command(self, ch):
# we handle escape as well as moving the line around, so have
# to override some of the default handling
self.lastcmd = ch
if ch == 27: # esc
self.cancelled = True
return 0
elif curses.ascii.isprint(ch):
self.line.insert(self.pos, chr(ch))
self.pos += 1
elif ch == curses.ascii.SOH: # ^a
self.pos = 0
elif ch in (curses.ascii.STX,curses.KEY_LEFT):
if self.pos > 0:
self.pos -= 1
elif ch in (curses.ascii.BS,curses.KEY_BACKSPACE):
if self.pos > 0:
self.pos -= 1
if self.pos < len(self.line):
self.line.pop(self.pos)
elif ch == curses.ascii.EOT: # ^d
if self.pos < len(self.line):
self.line.pop(self.pos)
elif ch == curses.ascii.ENQ: # ^e
self.pos = len(self.line)
elif ch in (curses.ascii.ACK, curses.KEY_RIGHT):
if self.pos < len(self.line):
self.pos +=1
elif ch == curses.ascii.VT: # ^k
self.line = self.line[:self.pos]
else:
return curses.textpad.Textbox.do_command(self, ch)
self.show_text()
return 1
def edit(self):
curses.doupdate()
r = curses.textpad.Textbox.edit(self)
if self.cancelled:
return None
return string.join(self.line, "")
class Grub:
ENTRY_WIN_LINES = 8
def __init__(self, file, fs = None):
self.screen = None
self.entry_win = None
self.text_win = None
if file:
self.read_config(file, fs)
def draw_main_windows(self):
if self.screen is None: #only init stuff once
self.screen = curses.initscr()
self.screen.timeout(1000)
if hasattr(curses, 'use_default_colors'):
try:
curses.use_default_colors()
except:
pass # Not important if we can't use colour
enable_cursor(False)
self.entry_win = curses.newwin(Grub.ENTRY_WIN_LINES + 2, 74, 2, 1)
self.text_win = curses.newwin(10, 70, 12, 5)
curses.def_prog_mode()
curses.reset_prog_mode()
self.screen.erase()
# create basic grub screen with a box of entries and a textbox
self.screen.addstr(1, 4, "pyGRUB version %s" %(PYGRUB_VER,))
self.entry_win.box()
self.screen.noutrefresh()
def fill_entry_list(self):
self.entry_win.erase()
self.entry_win.box()
maxy = self.entry_win.getmaxyx()[0]-3 # maxy - 2 for the frame + index
if self.selected_image > self.start_image + maxy:
self.start_image = self.selected_image
if self.selected_image < self.start_image:
self.start_image = self.selected_image
for y in range(self.start_image, len(self.cf.images)):
i = self.cf.images[y]
if y > self.start_image + maxy:
break
if y == self.selected_image:
self.entry_win.attron(curses.A_REVERSE)
self.entry_win.addstr(y + 1 - self.start_image, 2, i.title.expandtabs().ljust(70))
if y == self.selected_image:
self.entry_win.attroff(curses.A_REVERSE)
self.entry_win.noutrefresh()
def edit_entry(self, origimg):
def draw():
self.draw_main_windows()
self.text_win.addstr(0, 0, "Use the U and D keys to select which entry is highlighted.")
self.text_win.addstr(1, 0, "Press 'b' to boot, 'e' to edit the selected command in the")
self.text_win.addstr(2, 0, "boot sequence, 'c' for a command-line, 'o' to open a new line")
self.text_win.addstr(3, 0, "after ('O' for before) the selected line, 'd' to remove the")
self.text_win.addstr(4, 0, "selected line, or escape to go back to the main menu.")
self.text_win.addch(0, 8, curses.ACS_UARROW)
self.text_win.addch(0, 14, curses.ACS_DARROW)
(y, x) = self.text_win.getmaxyx()
self.text_win.move(y - 1, x - 1)
self.text_win.noutrefresh()
curline = 0
pos = 0
img = copy.deepcopy(origimg)
while 1:
draw()
self.entry_win.erase()
rs = 0
re = len(img.lines)
idp = 1
if re > Grub.ENTRY_WIN_LINES:
rs = curline - pos
re = rs + Grub.ENTRY_WIN_LINES
for idx in range(rs, re):
# current line should be highlighted
if idx == curline:
self.entry_win.attron(curses.A_REVERSE)
# trim the line
l = img.lines[idx].expandtabs().ljust(70)
if len(l) > 70:
l = l[:69] + ">"
self.entry_win.addstr(idp, 2, l)
if idx == curline:
self.entry_win.attroff(curses.A_REVERSE)
idp += 1
self.entry_win.box()
self.entry_win.noutrefresh()
curses.doupdate()
c = self.screen.getch()
if c in (ord('q'), 27): # 27 == esc
break
elif c == curses.KEY_UP:
curline -= 1
if pos > 0:
pos -= 1
elif c == curses.KEY_DOWN:
curline += 1
if pos < Grub.ENTRY_WIN_LINES - 1:
pos += 1
elif c == ord('b'):
self.isdone = True
break
elif c == ord('e'):
l = self.edit_line(img.lines[curline])
if l is not None:
img.set_from_line(l, replace = curline)
elif c == ord('d'):
img.lines.pop(curline)
elif c == ord('o'):
img.lines.insert(curline+1, "")
curline += 1
elif c == ord('O'):
img.lines.insert(curline, "")
elif c == ord('c'):
self.command_line_mode()
if self.isdone:
return
# bound at the top and bottom
if curline < 0:
curline = 0
elif curline >= len(img.lines):
curline = len(img.lines) - 1
if self.isdone:
# Fix to allow pygrub command-line editing in Lilo bootloader (used by IA64)
if platform.machine() == 'ia64':
origimg.reset(img.lines, img.path)
else:
origimg.reset(img.lines)
def edit_line(self, line):
self.screen.erase()
self.screen.addstr(1, 2, "[ Minimal BASH-like line editing is supported. ")
self.screen.addstr(2, 2, " ESC at any time cancels. ENTER at any time accepts your changes. ]")
self.screen.noutrefresh()
t = GrubLineEditor(self.screen, 5, 2, line)
enable_cursor(True)
ret = t.edit()
if ret:
return ret
return None
def command_line_mode(self):
self.screen.erase()
self.screen.addstr(1, 2, "[ Minimal BASH-like line editing is supported. ESC at any time ")
self.screen.addstr(2, 2, " exits. Typing 'boot' will boot with your entered commands. ] ")
self.screen.noutrefresh()
y = 5
lines = []
while 1:
t = GrubLineEditor(self.screen, y, 2)
enable_cursor(True)
ret = t.edit()
if ret:
if ret in ("quit", "return"):
break
elif ret != "boot":
y += 1
lines.append(ret)
continue
# if we got boot, then we want to boot the entered image
img = self.cf.new_image("entered", lines)
self.cf.add_image(img)
self.selected_image = len(self.cf.images) - 1
self.isdone = True
break
# else, we cancelled and should just go back
break
def read_config(self, fn, fs = None):
"""Read the given file to parse the config. If fs = None, then
we're being given a raw config file rather than a disk image."""
if not os.access(fn, os.R_OK):
raise RuntimeError, "Unable to access %s" %(fn,)
if platform.machine() == 'ia64':
cfg_list = map(lambda x: (x,grub.LiloConf.LiloConfigFile),
# common distributions
["/efi/debian/elilo.conf", "/efi/gentoo/elilo.conf",
"/efi/redflag/elilo.conf", "/efi/redhat/elilo.conf",
"/efi/SuSE/elilo.conf",] +
# fallbacks
["/efi/boot/elilo.conf", "/elilo.conf",])
else:
cfg_list = map(lambda x: (x,grub.GrubConf.Grub2ConfigFile),
["/boot/grub/grub.cfg", "/grub/grub.cfg",
"/boot/grub2/grub.cfg", "/grub2/grub.cfg"]) + \
map(lambda x: (x,grub.ExtLinuxConf.ExtLinuxConfigFile),
["/boot/isolinux/isolinux.cfg",
"/boot/extlinux/extlinux.conf",
"/boot/extlinux.conf"]) + \
map(lambda x: (x,grub.GrubConf.GrubConfigFile),
["/boot/grub/menu.lst", "/boot/grub/grub.conf",
"/grub/menu.lst", "/grub/grub.conf"])
if not fs:
# set the config file and parse it
for f,parser in cfg_list:
self.cf = parser()
self.cf.filename = fn
self.cf.parse()
return
for f,parser in cfg_list:
if fs.file_exists(f):
print >>sys.stderr, "Using %s to parse %s" % (parser,f)
self.cf = parser()
self.cf.filename = f
break
if self.__dict__.get('cf', None) is None:
raise RuntimeError, "couldn't find bootloader config file in the image provided."
f = fs.open_file(self.cf.filename)
# limit read size to avoid pathological cases
buf = f.read(FS_READ_MAX)
del f
self.cf.parse(buf)
def run(self):
timeout = int(self.cf.timeout)
self.selected_image = self.cf.default
# If the selected (default) image doesn't exist we select the first entry
if self.selected_image > len(self.cf.images):
self.selected_image = 0
self.isdone = False
while not self.isdone:
self.run_main(timeout)
timeout = -1
return self.selected_image
def run_main(self, timeout = -1):
def draw():
# set up the screen
self.draw_main_windows()
if not self.cf.hasPassword() or self.cf.hasPasswordAccess():
self.text_win.addstr(0, 0, "Use the U and D keys to select which entry is highlighted.")
self.text_win.addstr(1, 0, "Press enter to boot the selected OS, 'e' to edit the")
self.text_win.addstr(2, 0, "commands before booting, 'a' to modify the kernel arguments ")
self.text_win.addstr(3, 0, "before booting, or 'c' for a command line.")
else:
self.text_win.addstr(0, 0, "Use the U and D keys to select which entry is highlighted.")
self.text_win.addstr(1, 0, "Press enter to boot the selected OS or `p` to enter a")
self.text_win.addstr(2, 0, "password to unlock the next set of features.")
self.text_win.addch(0, 8, curses.ACS_UARROW)
self.text_win.addch(0, 14, curses.ACS_DARROW)
(y, x) = self.text_win.getmaxyx()
self.text_win.move(y - 1, x - 1)
self.text_win.noutrefresh()
# now loop until we hit the timeout or get a go from the user
mytime = 0
self.start_image = 0
while (timeout == -1 or mytime < int(timeout)):
draw()
if timeout != -1 and mytime != -1:
self.screen.addstr(20, 5, "Will boot selected entry in %2d seconds"
%(int(timeout) - mytime))
else:
self.screen.addstr(20, 5, " " * 80)
self.fill_entry_list()
curses.doupdate()
c = self.screen.getch()
if c == -1:
# Timed out waiting for a keypress
if mytime != -1:
mytime += 1
if mytime >= int(timeout):
self.isdone = True
break
else:
# received a keypress: stop the timer
mytime = -1
self.screen.timeout(-1)
# handle keypresses
if c == ord('c') and self.cf.hasPasswordAccess():
self.command_line_mode()
break
elif c == ord('a') and self.cf.hasPasswordAccess():
# find the kernel line, edit it and then boot
img = self.cf.images[self.selected_image]
for line in img.lines:
if line.startswith("kernel") or line.startswith("linux"):
l = self.edit_line(line)
if l is not None:
img.set_from_line(l, replace = True)
self.isdone = True
break
break
elif c == ord('e') and self.cf.hasPasswordAccess():
img = self.cf.images[self.selected_image]
self.edit_entry(img)
break
elif c == ord('p') and self.cf.hasPassword():
self.text_win.addstr(6, 1, "Password: ")
pwd = self.text_win.getstr(6, 8)
if not self.cf.checkPassword(pwd):
self.text_win.addstr(6, 1, "Password: ")
if self.cf.passExc is not None:
self.text_win.addstr(7, 0, "Exception: %s"
% self.cf.passExc)
else:
self.text_win.addstr(7, 0, "Failed!")
self.cf.setPasswordAccess( False )
else:
self.cf.setPasswordAccess( True )
break
elif c in (curses.KEY_ENTER, ord('\n'), ord('\r')):
self.isdone = True
break
elif c == curses.KEY_UP:
self.selected_image -= 1
elif c == curses.KEY_DOWN:
self.selected_image += 1
# elif c in (ord('q'), 27): # 27 == esc
# self.selected_image = -1
# self.isdone = True
# break
# bound at the top and bottom
if self.selected_image < 0:
self.selected_image = 0
elif self.selected_image >= len(self.cf.images):
self.selected_image = len(self.cf.images) - 1
def get_entry_idx(cf, entry):
# first, see if the given entry is numeric
try:
idx = string.atoi(entry)
return idx
except ValueError:
pass
# it's not, now check the labels for a match
for i in range(len(cf.images)):
if entry == cf.images[i].title:
return i
return None
def run_grub(file, entry, fs, cfg_args):
global g
global sel
def run_main(scr, *args):
global sel
global g
sel = g.run()
g = Grub(file, fs)
if list_entries:
for i in range(len(g.cf.images)):
img = g.cf.images[i]
print "title: %s" % img.title
print " root: %s" % img.root
print " kernel: %s" % img.kernel[1]
print " args: %s" % img.args
print " initrd: %s" % img.initrd[1]
if interactive and not list_entries:
curses.wrapper(run_main)
else:
sel = g.cf.default
# set the entry to boot as requested
if entry is not None:
idx = get_entry_idx(g.cf, entry)
if idx is not None and idx >= 0 and idx < len(g.cf.images):
sel = idx
if sel == -1:
print "No kernel image selected!"
sys.exit(1)
try:
img = g.cf.images[sel]
except IndexError:
img = g.cf.images[0]
grubcfg = { "kernel": None, "ramdisk": None, "args": "" }
grubcfg["kernel"] = img.kernel[1]
if img.initrd:
grubcfg["ramdisk"] = img.initrd[1]
if img.args:
grubcfg["args"] += img.args
if cfg_args:
grubcfg["args"] += " " + cfg_args
return grubcfg
def sniff_netware(fs, cfg):
if not fs.file_exists("/nwserver/xnloader.sys"):
return cfg
if not cfg["kernel"]:
cfg["kernel"] = "/nwserver/xnloader.sys"
return cfg
def format_sxp(kernel, ramdisk, args):
s = "linux (kernel %s)" % kernel
if ramdisk:
s += "(ramdisk %s)" % ramdisk
if args:
s += "(args \"%s\")" % args
return s
def format_simple(kernel, ramdisk, args, sep):
s = ("kernel %s" % kernel) + sep
if ramdisk:
s += ("ramdisk %s" % ramdisk) + sep
if args:
s += ("args %s" % args) + sep
s += sep
return s
if __name__ == "__main__":
sel = None
def usage():
print >> sys.stderr, "Usage: %s [-q|--quiet] [-i|--interactive] [-l|--list-entries] [-n|--not-really] [--output=] [--kernel=] [--ramdisk=] [--args=] [--entry=] [--output-directory=] [--output-format=sxp|simple|simple0] [--offset=] <image>" %(sys.argv[0],)
def copy_from_image(fs, file_to_read, file_type, output_directory,
not_really):
if not_really:
if fs.file_exists(file_to_read):
return "<%s:%s>" % (file_type, file_to_read)
else:
sys.exit("The requested %s file does not exist" % file_type)
try:
datafile = fs.open_file(file_to_read)
except Exception, e:
print >>sys.stderr, e
sys.exit("Error opening %s in guest" % file_to_read)
(tfd, ret) = tempfile.mkstemp(prefix="boot_"+file_type+".",
dir=output_directory)
dataoff = 0
while True:
data = datafile.read(FS_READ_MAX, dataoff)
if len(data) == 0:
os.close(tfd)
del datafile
return ret
try:
os.write(tfd, data)
except Exception, e:
print >>sys.stderr, e
os.close(tfd)
os.unlink(ret)
del datafile
sys.exit("Error writing temporary copy of "+file_type)
dataoff += len(data)
try:
opts, args = getopt.gnu_getopt(sys.argv[1:], 'qilnh::',
["quiet", "interactive", "list-entries", "not-really", "help",
"output=", "output-format=", "output-directory=", "offset=",
"entry=", "kernel=",
"ramdisk=", "args=", "isconfig", "debug"])
except getopt.GetoptError:
usage()
sys.exit(1)
if len(args) < 1:
usage()
sys.exit(1)
file = args[0]
output = None
entry = None
interactive = True
list_entries = False
isconfig = False
part_offs = None
debug = False
not_really = False
output_format = "sxp"
output_directory = "/var/run/xend/boot"
# what was passed in
incfg = { "kernel": None, "ramdisk": None, "args": "" }
# what grub or sniffing chose
chosencfg = { "kernel": None, "ramdisk": None, "args": None }
# what to boot
bootcfg = { "kernel": None, "ramdisk": None, "args": None }
for o, a in opts:
if o in ("-q", "--quiet"):
interactive = False
elif o in ("-i", "--interactive"):
interactive = True
elif o in ("-l", "--list-entries"):
list_entries = True
elif o in ("-n", "--not-really"):
not_really = True
elif o in ("-h", "--help"):
usage()
sys.exit()
elif o in ("--output",):
output = a
elif o in ("--kernel",):
incfg["kernel"] = a
elif o in ("--ramdisk",):
incfg["ramdisk"] = a
elif o in ("--args",):
incfg["args"] = a
elif o in ("--offset",):
try:
part_offs = [ int(a) ]
except ValueError:
print "offset value must be an integer"
usage()
sys.exit(1)
elif o in ("--entry",):
entry = a
# specifying the entry to boot implies non-interactive
interactive = False
elif o in ("--isconfig",):
isconfig = True
elif o in ("--debug",):
debug = True
elif o in ("--output-format",):
if a not in ["sxp", "simple", "simple0"]:
print "unknown output format %s" % a
usage()
sys.exit(1)
output_format = a
elif o in ("--output-directory",):
output_directory = a
if debug:
logging.basicConfig(level=logging.DEBUG)
if output is None or output == "-":
fd = sys.stdout.fileno()
else:
fd = os.open(output, os.O_WRONLY)
# debug
if isconfig:
chosencfg = run_grub(file, entry, fs, incfg["args"])
print " kernel: %s" % chosencfg["kernel"]
if chosencfg["ramdisk"]:
print " initrd: %s" % chosencfg["ramdisk"]
print " args: %s" % chosencfg["args"]
sys.exit(0)
# if boot filesystem is set then pass to fsimage.open
bootfsargs = '"%s"' % incfg["args"]
bootfsgroup = re.findall('zfs-bootfs=(.*?)[\s\,\"]', bootfsargs)
if bootfsgroup:
bootfsoptions = bootfsgroup[0]
else:
bootfsoptions = ""
# get list of offsets into file which start partitions
if part_offs is None:
part_offs = get_partition_offsets(file)
for offset in part_offs:
try:
fs = fsimage.open(file, offset, bootfsoptions)
chosencfg = sniff_netware(fs, incfg)
if not chosencfg["kernel"]:
chosencfg = run_grub(file, entry, fs, incfg["args"])
# Break as soon as we've found the kernel so that we continue
# to use this fsimage object
if chosencfg["kernel"]:
break
fs = None
except:
# IOErrors raised by fsimage.open
# RuntimeErrors raised by run_grub if no menu.lst present
if debug:
traceback.print_exc()
fs = None
continue
if list_entries:
sys.exit(0)
# Did looping through partitions find us a kernel?
if not fs:
raise RuntimeError, "Unable to find partition containing kernel"
bootcfg["kernel"] = copy_from_image(fs, chosencfg["kernel"], "kernel",
output_directory, not_really)
if chosencfg["ramdisk"]:
try:
bootcfg["ramdisk"] = copy_from_image(fs, chosencfg["ramdisk"],
"ramdisk", output_directory,
not_really)
except:
if not not_really:
os.unlink(bootcfg["kernel"])
raise
else:
initrd = None
args = None
if chosencfg["args"]:
zfsinfo = fsimage.getbootstring(fs)
if zfsinfo is not None:
e = re.compile("zfs-bootfs=[\w\-\.\:@/]+" )
(chosencfg["args"],count) = e.subn(zfsinfo, chosencfg["args"])
if count == 0:
chosencfg["args"] += " -B %s" % zfsinfo
args = chosencfg["args"]
if output_format == "sxp":
ostring = format_sxp(bootcfg["kernel"], bootcfg["ramdisk"], args)
elif output_format == "simple":
ostring = format_simple(bootcfg["kernel"], bootcfg["ramdisk"], args, "\n")
elif output_format == "simple0":
ostring = format_simple(bootcfg["kernel"], bootcfg["ramdisk"], args, "\0")
sys.stdout.flush()
os.write(fd, ostring)
|