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# corrupt a GPT table; ensure parted takes notice
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# Copyright (C) 2009-2012 Free Software Foundation, Inc.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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. "${srcdir=.}/init.sh"; path_prepend_ ../parted
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dd if=/dev/null of=$dev bs=$ss seek=$n_sectors || fail=1
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parted -s $dev mklabel gpt > empty 2>&1 || fail=1
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compare /dev/null empty || fail=1
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# print the empty table
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parted -m -s $dev unit s print > t 2>&1 || fail=1
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sed "s,.*/$dev:,$dev:," t > out || fail=1
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# check for expected output
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printf "BYT;\n$dev:${n_sectors}s:file:$sector_size_:$sector_size_:gpt::;\n" \
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compare exp out || fail=1
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parted -s $dev mkpart sw linux-swap 2048s 4095s > empty 2>&1 || fail=1
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compare /dev/null empty || fail=1
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# We're going to change the name of the first partition,
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# thus invalidating the PartitionEntryArrayCRC32 checksum.
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orig_byte=$(gpt_corrupt_primary_table_ $dev $ss) || fail=1
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# printing the table must succeed, but with a scary diagnostic.
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parted -s $dev print > err 2>&1 || fail=1
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grep Error: err > k && mv k err || fail=1
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# check for expected diagnostic
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echo 'Error: The primary GPT table is corrupt, but the backup appears OK,' \
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'so that will be used.' > exp || fail=1
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compare exp err || fail=1
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# ----------------------------------------------------------
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# Now, restore things, and corrupt the MyLBA in the alternate GUID table.
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# Restore original byte
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gpt_restore_primary_table_ $dev $ss "$orig_byte" || fail=1
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parted -s $dev print > out 2> err || fail=1
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compare /dev/null err || fail=1
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# The MyLBA member of the alternate table is in the last sector,
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# $n_sectors, 8-byte field starting at offset 24.
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alt_my_lba_offset=$(expr $n_sectors \* $ss - $ss + 24)
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# get the first byte of MyLBA
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byte=$(peek_ $dev $alt_my_lba_offset) || fail=1
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test x"$byte" = xA && new_byte=B || new_byte=A
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# Replace good byte with the bad one.
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poke_ $dev $alt_my_lba_offset "$new_byte" || fail=1
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# attempting to set partition name must print a diagnostic
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parted -m -s $dev name 1 foo > err 2>&1 || fail=1
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# check for expected diagnostic
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echo 'Error: The backup GPT table is corrupt, but the primary appears OK,' \
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'so that will be used.' > exp || fail=1
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compare exp err || fail=1
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# corruption is fixed; printing the table now elicits no diagnostic
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parted -m -s $dev u s print > out 2>&1 || fail=1
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# check for expected output
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printf "BYT;\nfile\n1:2048s:4095s:2048s::foo:;\n" > exp || fail=1
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sed "s/.*gpt::;/file/" out > k && mv k out || fail=1
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compare exp out || fail=1
added
removed
tests/t0280-gpt-corrupt.sh
