blob: 8f558a1b0a53e1570598dbe685770523cf2284fc (
plain)
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
|
#!/bin/sh
# Copyright (C) 2012 Free Software Foundation, Inc.
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
. "${srcdir=.}/init.sh"; path_prepend_ ../src
print_ver_ dd
require_sparse_support_
# Ensure basic sparse generation works
truncate -s1M sparse
dd bs=32K if=sparse of=sparse.dd conv=sparse
test $(stat -c %s sparse) = $(stat -c %s sparse.dd) || fail=1
# Demonstrate that conv=sparse with oflag=append,
# will do ineffective seeks in the output
printf 'a\000\000b' > file.in
printf 'ab' > exp
dd if=file.in bs=1 conv=sparse oflag=append > out
compare exp out || fail=1
# Demonstrate conv=sparse with conv=notrunc,
# where data in file.out is not overwritten with NULs
printf '____' > out
printf 'a__b' > exp
dd if=file.in bs=1 conv=sparse,notrunc of=out
compare exp out || fail=1
# Ensure we fall back to write if seek fails
dd if=file.in bs=1 conv=sparse | cat > file.out
cmp file.in file.out || fail=1
# Setup for block size tests
dd if=/dev/urandom of=file.in bs=1M count=1
truncate -s+1M file.in
dd if=/dev/urandom of=file.in bs=1M count=1 conv=notrunc oflag=append
# Ensure NUL blocks smaller than the block size are not made sparse
dd if=file.in of=file.out bs=2M conv=sparse
test $(stat -c %s file.in) = $(stat -c %s file.out) || fail=1
test $(stat -c %b file.in) = $(stat -c %b file.out) && fail=1
# Ensure NUL blocks >= block size are made sparse
dd if=file.in of=file.out bs=1M conv=sparse
test $(stat -c %s file.in) = $(stat -c %s file.out) || fail=1
test $(stat -c %b file.in) = $(stat -c %b file.out) || fail=1
Exit $fail
|
