1 files changed, 126 insertions, 0 deletions
diff --git a/tests/cp/link-deref.sh b/tests/cp/link-deref.sh
new file mode 100755
index 0000000..28b20a2
--- /dev/null
+++ b/tests/cp/link-deref.sh
@@ -0,0 +1,126 @@
+#!/bin/sh
+# Exercise cp --link's behavior regarding the dereferencing of symbolic links.
+
+# Copyright (C) 2013-2023 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/>.
+
+. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
+print_ver_ cp
+
+if { grep '^#define HAVE_LINKAT 1' "$CONFIG_HEADER" > /dev/null \
+     && grep '#undef LINKAT_SYMLINK_NOTSUP' "$CONFIG_HEADER" > /dev/null; } \
+   || grep '^#define LINK_FOLLOWS_SYMLINKS 0' "$CONFIG_HEADER" > /dev/null; then
+  # With this config cp will attempt to linkat() to hardlink a symlink.
+  # So now double check the current file system supports this operation.
+  ln -s testtarget test_sl || framework_failure_
+  ln -P test_sl test_hl_sl || framework_failure_
+  ino_sl="$(stat -c '%i' test_sl)" || framework_failure_
+  ino_hl="$(stat -c '%i' test_hl_sl)" || framework_failure_
+  test "$ino_sl" = "$ino_hl" && can_hardlink_to_symlink=1
+fi
+
+mkdir dir              || framework_failure_
+> file                 || framework_failure_
+ln -s dir     dirlink  || framework_failure_
+ln -s file    filelink || framework_failure_
+ln -s nowhere danglink || framework_failure_
+
+# printf format of the output line.
+outformat='%s|result=%s|inode=%s|type=%s|error=%s\n'
+
+for src in dirlink filelink danglink; do
+  # Get symlink's target.
+  tgt=$(readlink $src) || framework_failure_
+  # Get inodes and file type of the symlink (src) and its target (tgt).
+  # Note: this will fail for 'danglink'; catch it.
+  ino_src="$(stat -c '%i' $src)" || framework_failure_
+  typ_src="$(stat -c '%F' $src)" || framework_failure_
+  ino_tgt="$(stat -c '%i' $tgt 2>/dev/null)" || ino_tgt=
+  typ_tgt="$(stat -c '%F' $tgt 2>/dev/null)" || typ_tgt=
+
+  for o in '' -L -H -P; do
+
+    # Skip the -P case where we don't or can't hardlink symlinks
+    ! test "$can_hardlink_to_symlink" && test "$o" = '-P' && continue
+
+    for r in '' -R; do
+
+      command="cp --link $o $r $src dst"
+      $command 2> err
+      result=$?
+
+      # Get inode and file type of the destination (which may fail, too).
+      ino_dst="$(stat -c '%i' dst 2>/dev/null)" || ini_dst=
+      typ_dst="$(stat -c '%F' dst 2>/dev/null)" || typ_dst=
+
+      # Print the actual result in a certain format.
+      printf "$outformat" \
+        "$command"   \
+        "$result"   \
+        "$ino_dst"  \
+        "$typ_dst"  \
+        "$(cat err)"  \
+        > out
+
+      # What was expected?
+      if [ "$o" = "-P" ]; then
+        # cp --link should not dereference if -P is given.
+        exp_result=0
+        exp_inode=$ino_src
+        exp_ftype=$typ_src
+        exp_error=
+      elif [ "$src" = 'danglink' ]; then
+        # Dereferencing should fail for the 'danglink'.
+        exp_result=1
+        exp_inode=
+        exp_ftype=
+        exp_error="cp: cannot stat 'danglink': No such file or directory"
+      elif [ "$src" = 'dirlink' ] && [ "$r" != '-R' ]; then
+        # Dereferencing should fail for the 'dirlink' without -R.
+        exp_result=1
+        exp_inode=
+        exp_ftype=
+        exp_error="cp: -r not specified; omitting directory 'dirlink'"
+      elif [ "$src" = 'dirlink' ]; then
+        # cp --link -R 'dirlink' should create a new directory.
+        exp_result=0
+        exp_inode=$ino_dst
+        exp_ftype=$typ_dst
+        exp_error=
+      else
+        # cp --link 'filelink' should create a hard link to the target.
+        exp_result=0
+        exp_inode=$ino_tgt
+        exp_ftype=$typ_tgt
+        exp_error=
+      fi
+
+      # Print the expected result in a certain format.
+      printf "$outformat" \
+        "$command"   \
+        "$exp_result" \
+        "$exp_inode"  \
+        "$exp_ftype"  \
+        "$exp_error"  \
+        > exp
+
+      compare exp out || { ls -lid $src $tgt dst; fail=1; }
+
+      rm -rf dst err exp out || framework_failure_
+    done
+  done
+done
+
+Exit $fail