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[vcpkg] implement copy_symlink working for non-elevated processes (#12400)

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* [vcpkg] implement copy_symlink working for non-elevated processes

* [vcpkg] read_symlink Windows implementation

* [vcpkg] normalize_path on Windows only

* Update toolsrc/src/vcpkg/base/files.cpp

Co-authored-by: nicole mazzuca <mazzucan@outlook.com>

* Update toolsrc/src/vcpkg/base/files.cpp

Co-authored-by: nicole mazzuca <mazzucan@outlook.com>

* Update toolsrc/src/vcpkg/base/files.cpp

Co-authored-by: nicole mazzuca <mazzucan@outlook.com>

* remove normalization

* Update toolsrc/src/vcpkg/base/files.cpp

Co-authored-by: nicole mazzuca <mazzucan@outlook.com>

* Update toolsrc/src/vcpkg/base/files.cpp

Co-authored-by: nicole mazzuca <mazzucan@outlook.com>

* Update toolsrc/src/vcpkg/base/files.cpp

Co-authored-by: nicole mazzuca <mazzucan@outlook.com>

* Update toolsrc/src/vcpkg/base/files.cpp

Co-authored-by: nicole mazzuca <mazzucan@outlook.com>

* Update toolsrc/src/vcpkg/base/files.cpp

Co-authored-by: nicole mazzuca <mazzucan@outlook.com>

* use unique_ptr

* comments

Co-authored-by: nicole mazzuca <mazzucan@outlook.com>
This commit is contained in:
Maksim Moisiuk 2020-07-16 00:13:54 +02:00 committed by GitHub
parent 830893fb8e
commit 8254d3be9f
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1 changed files with 56 additions and 1 deletions
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57
toolsrc/src/vcpkg/base/files.cpp
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@ -102,6 +102,61 @@ namespace vcpkg::Files
return status_implementation(false, p, ec);
}
fs::path read_symlink_implementation(const fs::path& oldpath, std::error_code& ec)
{
#if defined(_WIN32) && !VCPKG_USE_STD_FILESYSTEM
ec.clear();
auto handle = CreateFileW(oldpath.c_str(),
0, // open just the metadata
FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
nullptr /* no security attributes */,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
nullptr /* no template file */);
if (handle == INVALID_HANDLE_VALUE)
{
ec.assign(GetLastError(), std::system_category());
return oldpath;
}
fs::path target;
const DWORD maxsize = 32768;
const std::unique_ptr<wchar_t[]> buffer(new wchar_t[maxsize]);
const auto rc = GetFinalPathNameByHandleW(handle, buffer.get(), maxsize, 0);
if (rc > 0 && rc < maxsize)
{
target = buffer.get();
}
else
{
ec.assign(GetLastError(), std::system_category());
}
CloseHandle(handle);
return target;
#else // ^^^ defined(_WIN32) && !VCPKG_USE_STD_FILESYSTEM // !defined(_WIN32) || VCPKG_USE_STD_FILESYSTEM vvv
return fs::stdfs::read_symlink(oldpath, ec);
#endif // ^^^ !defined(_WIN32) || VCPKG_USE_STD_FILESYSTEM
}
void copy_symlink_implementation(const fs::path& oldpath, const fs::path& newpath, std::error_code& ec)
{
#if defined(_WIN32) && !VCPKG_USE_STD_FILESYSTEM
const auto target = read_symlink_implementation(oldpath, ec);
if (ec) return;
const DWORD flags = SYMBOLIC_LINK_FLAG_ALLOW_UNPRIVILEGED_CREATE;
if (!CreateSymbolicLinkW(newpath.c_str(), target.c_str(), flags))
{
const auto err = GetLastError();
ec.assign(err, std::system_category());
return;
}
ec.clear();
return;
#else // ^^^ defined(_WIN32) && !VCPKG_USE_STD_FILESYSTEM // !defined(_WIN32) || VCPKG_USE_STD_FILESYSTEM vvv
return fs::stdfs::copy_symlink(oldpath, newpath, ec);
#endif // ^^^ !defined(_WIN32) || VCPKG_USE_STD_FILESYSTEM
}
// does _not_ follow symlinks
void set_writeable(const fs::path& path, std::error_code& ec) noexcept
{
@ -800,7 +855,7 @@ namespace vcpkg::Files
}
virtual void copy_symlink(const fs::path& oldpath, const fs::path& newpath, std::error_code& ec) override
{
return fs::stdfs::copy_symlink(oldpath, newpath, ec);
return Files::copy_symlink_implementation(oldpath, newpath, ec);
}
virtual fs::file_status status(const fs::path& path, std::error_code& ec) const override