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#!/bin/sh
# Exercise cp --link's behavior regarding the dereferencing of symbolic links.
# Copyright (C) 2013-2021 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
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