1 files changed, 47 insertions, 0 deletions
diff --git a/tests/cp/proc-zero-len.sh b/tests/cp/proc-zero-len.sh
new file mode 100755
index 0000000..54bc428
--- /dev/null
+++ b/tests/cp/proc-zero-len.sh
@@ -0,0 +1,47 @@
+#!/bin/sh
+# Ensure that cp copies contents of non-empty "regular" file with st_size==0
+
+# Copyright (C) 2007-2020 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 <https://www.gnu.org/licenses/>.
+
+. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
+print_ver_ cp
+
+touch empty || framework_failure_
+
+f=/proc/cpuinfo
+test -r $f || f=empty
+
+cat $f > out || fail=1
+
+# With coreutils-6.9, this would create a zero-length "exp" file.
+# Skip this test on architectures like aarch64 where the inode
+# number of the file changed during the cp run.
+cp $f exp 2>err \
+  || { fail=1;
+       grep 'replaced while being copied' err \
+         && skip_ "File $f is being replaced while being copied"; }
+
+# Don't simply compare contents; they might differ,
+# e.g., if CPU freq changes between cat and cp invocations.
+# Instead, simply compare whether they're both nonempty.
+test -s out \
+  && { rm -f out; echo nonempty > out; }
+test -s exp \
+  && { rm -f exp; echo nonempty > exp; }
+
+compare exp out || fail=1
+
+Exit $fail