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cmake: Add -E create_hardlink

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Fixes: #20950
Signed-off-by: Sibi Siddharthan <sibisiddharthan.github@gmail.com>
This commit is contained in:
Sibi Siddharthan 2020-07-14 21:54:04 +05:30
parent 2da778664d
commit 2fad00940d
13 changed files with 90 additions and 0 deletions
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7
Help/manual/cmake.1.rst
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@ -598,6 +598,13 @@ Available commands are:
.. note::
Path to where ``<new>`` symbolic link will be created has to exist beforehand.
``create_hardlink <old> <new>``
Create a hard link ``<new>`` naming ``<old>``.
.. note::
Path to where ``<new>`` hard link will be created has to exist beforehand.
``<old>`` has to exist beforehand.
``echo [<string>...]``
Displays arguments as text.

5
Help/release/dev/cmake-E-create_hardlink.rst Normal file
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@ -0,0 +1,5 @@
cmake-E-create_hardlink
-----------------------
* The :manual:`cmake(1)` gained a ``-E create_hardlink`` command-line tool
that can be used to create hardlinks between files.

29
Source/cmcmd.cxx
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@ -126,6 +126,7 @@ void CMakeCommandUsage(const char* program)
<< " touch <file>... - touch a <file>.\n"
<< " touch_nocreate <file>... - touch a <file> but do not create it.\n"
<< " create_symlink old new - create a symbolic link new -> old\n"
<< " create_hardlink old new - create a hard link new -> old\n"
<< " true - do nothing with an exit code of 0\n"
<< " false - do nothing with an exit code of 1\n"
#if defined(_WIN32) && !defined(__CYGWIN__)
@ -1034,6 +1035,34 @@ int cmcmd::ExecuteCMakeCommand(std::vector<std::string> const& args)
return 0;
}
// Command to create a hard link. Fails on platforms not
// supporting them.
if (args[1] == "create_hardlink" && args.size() == 4) {
const char* SouceFileName = args[2].c_str();
const char* destinationFileName = args[3].c_str();
if (!cmSystemTools::FileExists(SouceFileName)) {
std::cerr << "failed to create hard link because source path '"
<< SouceFileName << "' does not exist \n";
return 1;
}
if ((cmSystemTools::FileExists(destinationFileName) ||
cmSystemTools::FileIsSymlink(destinationFileName)) &&
!cmSystemTools::RemoveFile(destinationFileName)) {
std::string emsg = cmSystemTools::GetLastSystemError();
std::cerr << "failed to create hard link '" << destinationFileName
<< "' because existing path cannot be removed: " << emsg
<< "\n";
return 1;
}
if (!cmSystemTools::CreateLink(args[2], args[3])) {
return 1;
}
return 0;
}
// Command to do nothing with an exit code of 0.
if (args[1] == "true") {
return 0;

1
Tests/RunCMake/CommandLine/E_create_hardlink-no-arg-result.txt Normal file
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@ -0,0 +1 @@
1

3
Tests/RunCMake/CommandLine/E_create_hardlink-no-arg-stderr.txt Normal file
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@ -0,0 +1,3 @@
^CMake Error: cmake version .*
Usage: .* -E <command> \[arguments\.\.\.\]
Available commands:

1
Tests/RunCMake/CommandLine/E_create_hardlink-no-directory-result.txt Normal file
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@ -0,0 +1 @@
1

1
Tests/RunCMake/CommandLine/E_create_hardlink-no-directory-stderr.txt Normal file
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@ -0,0 +1 @@
^CMake Error: failed to create link .* no such file or directory

1
Tests/RunCMake/CommandLine/E_create_hardlink-non-existent-source-result.txt Normal file
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@ -0,0 +1 @@
1

1
Tests/RunCMake/CommandLine/E_create_hardlink-non-existent-source-stderr.txt Normal file
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@ -0,0 +1 @@
^failed to create hard link because source path .* does not exist

3
Tests/RunCMake/CommandLine/E_create_hardlink-unresolved-symlink-prereq-check.cmake Normal file
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@ -0,0 +1,3 @@
if(${actual_stderr_var} MATCHES "operation not permitted")
unset(msg)
endif()

1
Tests/RunCMake/CommandLine/E_create_hardlink-unresolved-symlink-result.txt Normal file
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@ -0,0 +1 @@
1

1
Tests/RunCMake/CommandLine/E_create_hardlink-unresolved-symlink-stderr.txt Normal file
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@ -0,0 +1 @@
^failed to create hard link because source path .* does not exist

36
Tests/RunCMake/CommandLine/RunCMakeTest.cmake
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@ -348,6 +348,42 @@ run_cmake_command(E_create_symlink-no-replace-dir
${CMAKE_COMMAND} -E create_symlink T .
)
#create hard link tests
run_cmake_command(E_create_hardlink-no-arg
${CMAKE_COMMAND} -E create_hardlink
)
set(dir ${RunCMake_BINARY_DIR}/hardlink_tests)
file(REMOVE_RECURSE "${dir}")
file(MAKE_DIRECTORY ${dir})
run_cmake_command(E_create_hardlink-non-existent-source
${CMAKE_COMMAND} -E create_hardlink ${dir}/I_dont_exist ${dir}/link
)
file(TOUCH ${dir}/1)
run_cmake_command(E_create_hardlink-ok
${CMAKE_COMMAND} -E create_hardlink ${dir}/1 ${dir}/1-link
)
run_cmake_command(E_create_hardlink-no-directory
${CMAKE_COMMAND} -E create_hardlink ${dir}/1 ${dir}/a/1-link
)
#On Windows, if the user does not have sufficient privileges
#don't fail this test
set(RunCMake_DEFAULT_stderr "(operation not permitted)?")
run_cmake_command(E_create_hardlink-unresolved-symlink-prereq
${CMAKE_COMMAND} -E create_symlink ${dir}/1 ${dir}/1-symlink
)
file(REMOVE ${dir}/1)
run_cmake_command(E_create_hardlink-unresolved-symlink
${CMAKE_COMMAND} -E create_hardlink ${dir}/1-symlink ${dir}/1s-link
)
unset(RunCMake_DEFAULT_stderr)
set(in ${RunCMake_SOURCE_DIR}/copy_input)
set(out ${RunCMake_BINARY_DIR}/copy_output)
file(REMOVE_RECURSE "${out}")