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ff1096a0c2
* NEWS: Mention this. * src/cmp.c (main, cmp): Do not trust st_size == 0, as it may be a /proc file. * tests/brief-vs-stat-zero-kernel-lies: Also test cmp -s.
44 lines
1.6 KiB
Bash
Executable File
44 lines
1.6 KiB
Bash
Executable File
#!/bin/sh
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# Before diff-3.4, diff --brief could mistakenly declare a difference.
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# For example, when comparing a file like /proc/cmdline (for which the linux
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# kernel reports a st_size of 0 even though it is not an empty file) to a
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# copy of that file's contents residing on a "normal" file system.
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. "${srcdir=.}/init.sh"; path_prepend_ ../src
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fail=0
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# Skip the test unless we have an appropriate file.
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boot=/proc/cmdline
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test -r $boot || skip_ no $boot file
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sz=$(stat --format %s $boot) || skip_ stat --format %s does not work
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test $sz = 0 || skip_ $boot has nonzero size
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# /proc/self is not useful on the Hurd, where it always points to "1",
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# so skip this test when /proc/self does not point to a file whose name is
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# the current process ID.
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readlink /proc/self > pid & pid=$!
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wait $pid
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echo $pid > exp
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compare exp pid || skip_ /proc/self is not useful on this system
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# There are two code paths to test: one for non-binary and one for binary files.
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# $boot is non-binary.
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cat $boot > ref || framework_failure_
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diff --brief $boot ref > out 2>&1 || fail=1
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compare /dev/null out || fail=1
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# /proc/self/cmdline is a NUL-terminated list of argv values,
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# so construct the expected output here:
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printf 'diff\0--brief\0/proc/self/cmdline\0bin\0' > bin || framework_failure_
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# And run the command that is embedded in that output:
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diff --brief /proc/self/cmdline bin > out 2>&1 || fail=1
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compare /dev/null out || fail=1
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# Similarly for cmp -s.
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printf 'cmp\0-s\0/proc/self/cmdline\0bin\0' > bin || framework_failure_
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cmp -s /proc/self/cmdline bin > out 2>&1 || fail=1
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compare /dev/null out || fail=1
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Exit $fail
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