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Enable the unix:// store on Windows

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Windows now has some basic Unix Domain Socket support, see
https://devblogs.microsoft.com/commandline/af_unix-comes-to-windows/

Building `nix daemon` on Windows I've left for later, because the daemon
currently forks per connection but this is not an option on Windows. But
we can get the client part working right away.
This commit is contained in:
John Ericson 2024-04-18 16:49:52 -04:00
parent 3a3c205fa7
commit b973cd494f
10 changed files with 164 additions and 87 deletions
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107
src/libutil/unix/unix-domain-socket.cc
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@ -1,107 +0,0 @@
#include "file-system.hh"
#include "processes.hh"
#include "unix-domain-socket.hh"
#include "util.hh"
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
namespace nix {
AutoCloseFD createUnixDomainSocket()
{
AutoCloseFD fdSocket = socket(PF_UNIX, SOCK_STREAM
#ifdef SOCK_CLOEXEC
| SOCK_CLOEXEC
#endif
, 0);
if (!fdSocket)
throw SysError("cannot create Unix domain socket");
closeOnExec(fdSocket.get());
return fdSocket;
}
AutoCloseFD createUnixDomainSocket(const Path & path, mode_t mode)
{
auto fdSocket = nix::createUnixDomainSocket();
bind(fdSocket.get(), path);
if (chmod(path.c_str(), mode) == -1)
throw SysError("changing permissions on '%1%'", path);
if (listen(fdSocket.get(), 100) == -1)
throw SysError("cannot listen on socket '%1%'", path);
return fdSocket;
}
static void bindConnectProcHelper(
std::string_view operationName, auto && operation,
int fd, const std::string & path)
{
struct sockaddr_un addr;
addr.sun_family = AF_UNIX;
// Casting between types like these legacy C library interfaces
// require is forbidden in C++. To maintain backwards
// compatibility, the implementation of the bind/connect functions
// contains some hints to the compiler that allow for this
// special case.
auto * psaddr = reinterpret_cast<struct sockaddr *>(&addr);
if (path.size() + 1 >= sizeof(addr.sun_path)) {
Pipe pipe;
pipe.create();
Pid pid = startProcess([&] {
try {
pipe.readSide.close();
Path dir = dirOf(path);
if (chdir(dir.c_str()) == -1)
throw SysError("chdir to '%s' failed", dir);
std::string base(baseNameOf(path));
if (base.size() + 1 >= sizeof(addr.sun_path))
throw Error("socket path '%s' is too long", base);
memcpy(addr.sun_path, base.c_str(), base.size() + 1);
if (operation(fd, psaddr, sizeof(addr)) == -1)
throw SysError("cannot %s to socket at '%s'", operationName, path);
writeFull(pipe.writeSide.get(), "0\n");
} catch (SysError & e) {
writeFull(pipe.writeSide.get(), fmt("%d\n", e.errNo));
} catch (...) {
writeFull(pipe.writeSide.get(), "-1\n");
}
});
pipe.writeSide.close();
auto errNo = string2Int<int>(chomp(drainFD(pipe.readSide.get())));
if (!errNo || *errNo == -1)
throw Error("cannot %s to socket at '%s'", operationName, path);
else if (*errNo > 0) {
errno = *errNo;
throw SysError("cannot %s to socket at '%s'", operationName, path);
}
} else {
memcpy(addr.sun_path, path.c_str(), path.size() + 1);
if (operation(fd, psaddr, sizeof(addr)) == -1)
throw SysError("cannot %s to socket at '%s'", operationName, path);
}
}
void bind(int fd, const std::string & path)
{
unlink(path.c_str());
bindConnectProcHelper("bind", ::bind, fd, path);
}
void connect(int fd, const std::string & path)
{
bindConnectProcHelper("connect", ::connect, fd, path);
}
}

31
src/libutil/unix/unix-domain-socket.hh
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@ -1,31 +0,0 @@
#pragma once
///@file
#include "types.hh"
#include "file-descriptor.hh"
#include <unistd.h>
namespace nix {
/**
* Create a Unix domain socket.
*/
AutoCloseFD createUnixDomainSocket();
/**
* Create a Unix domain socket in listen mode.
*/
AutoCloseFD createUnixDomainSocket(const Path & path, mode_t mode);
/**
* Bind a Unix domain socket to a path.
*/
void bind(int fd, const std::string & path);
/**
* Connect to a Unix domain socket.
*/
void connect(int fd, const std::string & path);
}