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3d53e7fe1c
* src/copy.c (copy_reg): Don't truncate an existing file, to support copying attributes between existing files. The original use case only considered creating new files, and it would be a very unusual use case to be relying on the truncating behavior. * doc/coreutils.texi (cp invocation): Mention the non truncating behavior. * tests/cp/attr-existing: A new test to ensure O_TRUNC skipped. * tests/Makefile.am: Reference the new test. * NEWS: Mention the change in behavior.
30 lines
965 B
Bash
Executable File
30 lines
965 B
Bash
Executable File
#!/bin/sh
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# Make sure cp --attributes-only doesn't truncate existing data
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# Copyright 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_ ../src
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print_ver_ cp
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printf '1' > file1
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printf '2' > file2
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printf '2' > file2.exp
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cp --attributes-only file1 file2 || fail=1
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cmp file2 file2.exp || fail=1
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Exit $fail
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