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From 7b5f0fa47cd04c84975250d5b5da7c98e097e99f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?P=C3=A1draig=20Brady?= <P@draigBrady.com>
Date: Wed, 1 Apr 2020 12:51:34 +0100
Subject: cp: ensure --attributes-only doesn't remove files
* src/copy.c (copy_internal): Ensure we don't unlink the destination
unless explicitly requested.
* tests/cp/attr-existing.sh: Add test cases.
Fixes https://bugs.gnu.org/40352
---
NEWS | 7 +++++++
src/copy.c | 9 +++++----
tests/cp/attr-existing.sh | 21 ++++++++++++++++++---
3 files changed, 30 insertions(+), 7 deletions(-)
diff --git a/src/copy.c b/src/copy.c
index 6e5efc708..54601ce07 100644
--- a/src/copy.c
+++ b/src/copy.c
@@ -2211,10 +2211,11 @@ copy_internal (char const *src_name, char const *dst_name,
/* Never unlink dst_name when in move mode. */
&& ! x->move_mode
&& (x->unlink_dest_before_opening
- || (x->preserve_links && 1 < dst_sb.st_nlink)
- || (x->dereference == DEREF_NEVER
- && ! S_ISREG (src_sb.st_mode))
- ))
+ || (x->data_copy_required
+ && ((x->preserve_links && 1 < dst_sb.st_nlink)
+ || (x->dereference == DEREF_NEVER
+ && ! S_ISREG (src_sb.st_mode))))
+ ))
{
if (unlink (dst_name) != 0 && errno != ENOENT)
{
diff --git a/tests/cp/attr-existing.sh b/tests/cp/attr-existing.sh
index 59ce64183..14fc8445c 100755
--- a/tests/cp/attr-existing.sh
+++ b/tests/cp/attr-existing.sh
@@ -19,11 +19,26 @@
. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
print_ver_ cp
-printf '1' > file1
-printf '2' > file2
-printf '2' > file2.exp
+printf '1' > file1 || framework_failure_
+printf '2' > file2 || framework_failure_
+printf '2' > file2.exp || framework_failure_
cp --attributes-only file1 file2 || fail=1
cmp file2 file2.exp || fail=1
+# coreutils v8.32 and before would remove destination files
+# if hardlinked or the source was not a regular file.
+ln file2 link2 || framework_failure_
+cp -a --attributes-only file1 file2 || fail=1
+cmp file2 file2.exp || fail=1
+
+ln -s file1 sym1 || framework_failure_
+returns_ 1 cp -a --attributes-only sym1 file2 || fail=1
+cmp file2 file2.exp || fail=1
+
+# One can still force removal though
+cp -a --remove-destination --attributes-only sym1 file2 || fail=1
+test -L file2 || fail=1
+cmp file1 file2 || fail=1
+
Exit $fail
--
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