mirror of
https://github.com/NixOS/nix
synced 2025-06-26 07:31:15 +02:00
Build a minimized Nix with MinGW
At this point many features are stripped out, but this works:
- Can run libnix{util,store,expr} unit tests
- Can run some Nix commands
Co-Authored-By volth <volth@volth.com>
Co-Authored-By Brian McKenna <brian@brianmckenna.org>
This commit is contained in:
John Ericson
parent
2248a3f545
commit
8433027e35
111 changed files with 1162 additions and 140 deletions
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@ -1,5 +1,6 @@
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#include "environment-variables.hh"
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#include "file-system.hh"
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#include "file-path.hh"
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#include "file-path-impl.hh"
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#include "signals.hh"
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#include "finally.hh"
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@ -18,6 +19,10 @@
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#include <sys/time.h>
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#include <unistd.h>
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#ifdef _WIN32
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# include <io.h>
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#endif
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namespace fs = std::filesystem;
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namespace nix {
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@ -128,10 +133,10 @@ std::string_view baseNameOf(std::string_view path)
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return "";
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auto last = path.size() - 1;
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while (last > 0 && path[last] == '/')
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while (last > 0 && NativePathTrait::isPathSep(path[last]))
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last -= 1;
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auto pos = path.rfind('/', last);
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auto pos = NativePathTrait::rfindPathSep(path, last);
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if (pos == path.npos)
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pos = 0;
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else
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@ -164,11 +169,16 @@ struct stat stat(const Path & path)
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return st;
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}
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#ifdef _WIN32
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# define STAT stat
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#else
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# define STAT lstat
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#endif
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struct stat lstat(const Path & path)
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{
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struct stat st;
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if (lstat(path.c_str(), &st))
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if (STAT(path.c_str(), &st))
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throw SysError("getting status of '%1%'", path);
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return st;
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}
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@ -177,7 +187,7 @@ struct stat lstat(const Path & path)
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std::optional<struct stat> maybeLstat(const Path & path)
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{
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std::optional<struct stat> st{std::in_place};
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if (lstat(path.c_str(), &*st))
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if (STAT(path.c_str(), &*st))
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{
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if (errno == ENOENT || errno == ENOTDIR)
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st.reset();
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@ -207,6 +217,7 @@ bool pathAccessible(const Path & path)
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Path readLink(const Path & path)
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{
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#ifndef _WIN32
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checkInterrupt();
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std::vector<char> buf;
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for (ssize_t bufSize = PATH_MAX/4; true; bufSize += bufSize/2) {
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@ -220,13 +231,16 @@ Path readLink(const Path & path)
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else if (rlSize < bufSize)
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return std::string(buf.data(), rlSize);
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}
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#else
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// TODO modern Windows does in fact support symlinks
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throw UnimplementedError("reading symbolic link '%1%'", path);
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#endif
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}
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bool isLink(const Path & path)
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{
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struct stat st = lstat(path);
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return S_ISLNK(st.st_mode);
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return getFileType(path) == DT_LNK;
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}
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@ -274,7 +288,12 @@ unsigned char getFileType(const Path & path)
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std::string readFile(const Path & path)
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{
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AutoCloseFD fd = open(path.c_str(), O_RDONLY | O_CLOEXEC);
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AutoCloseFD fd = toDescriptor(open(path.c_str(), O_RDONLY
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// TODO
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#ifndef _WIN32
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| O_CLOEXEC
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#endif
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));
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if (!fd)
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throw SysError("opening file '%1%'", path);
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return readFile(fd.get());
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@ -283,7 +302,12 @@ std::string readFile(const Path & path)
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void readFile(const Path & path, Sink & sink)
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{
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AutoCloseFD fd = open(path.c_str(), O_RDONLY | O_CLOEXEC);
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AutoCloseFD fd = toDescriptor(open(path.c_str(), O_RDONLY
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// TODO
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#ifndef _WIN32
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| O_CLOEXEC
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#endif
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));
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if (!fd)
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throw SysError("opening file '%s'", path);
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drainFD(fd.get(), sink);
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@ -292,7 +316,12 @@ void readFile(const Path & path, Sink & sink)
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void writeFile(const Path & path, std::string_view s, mode_t mode, bool sync)
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{
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AutoCloseFD fd = open(path.c_str(), O_WRONLY | O_TRUNC | O_CREAT | O_CLOEXEC, mode);
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AutoCloseFD fd = toDescriptor(open(path.c_str(), O_WRONLY | O_TRUNC | O_CREAT
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// TODO
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#ifndef _WIN32
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| O_CLOEXEC
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#endif
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, mode));
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if (!fd)
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throw SysError("opening file '%1%'", path);
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try {
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@ -312,7 +341,12 @@ void writeFile(const Path & path, std::string_view s, mode_t mode, bool sync)
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void writeFile(const Path & path, Source & source, mode_t mode, bool sync)
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{
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AutoCloseFD fd = open(path.c_str(), O_WRONLY | O_TRUNC | O_CREAT | O_CLOEXEC, mode);
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AutoCloseFD fd = toDescriptor(open(path.c_str(), O_WRONLY | O_TRUNC | O_CREAT
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// TODO
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#ifndef _WIN32
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| O_CLOEXEC
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#endif
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, mode));
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if (!fd)
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throw SysError("opening file '%1%'", path);
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@ -339,21 +373,23 @@ void writeFile(const Path & path, Source & source, mode_t mode, bool sync)
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void syncParent(const Path & path)
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{
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AutoCloseFD fd = open(dirOf(path).c_str(), O_RDONLY, 0);
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AutoCloseFD fd = toDescriptor(open(dirOf(path).c_str(), O_RDONLY, 0));
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if (!fd)
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throw SysError("opening file '%1%'", path);
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fd.fsync();
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}
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static void _deletePath(int parentfd, const Path & path, uint64_t & bytesFreed)
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static void _deletePath(Descriptor parentfd, const Path & path, uint64_t & bytesFreed)
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{
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#ifndef _WIN32
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checkInterrupt();
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std::string name(baseNameOf(path));
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struct stat st;
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if (fstatat(parentfd, name.c_str(), &st, AT_SYMLINK_NOFOLLOW) == -1) {
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if (fstatat(parentfd, name.c_str(), &st,
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AT_SYMLINK_NOFOLLOW) == -1) {
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if (errno == ENOENT) return;
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throw SysError("getting status of '%1%'", path);
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}
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@ -405,6 +441,10 @@ static void _deletePath(int parentfd, const Path & path, uint64_t & bytesFreed)
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if (errno == ENOENT) return;
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throw SysError("cannot unlink '%1%'", path);
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}
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#else
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// TODO implement
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throw UnimplementedError("_deletePath");
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#endif
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}
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static void _deletePath(const Path & path, uint64_t & bytesFreed)
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@ -413,7 +453,7 @@ static void _deletePath(const Path & path, uint64_t & bytesFreed)
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if (dir == "")
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dir = "/";
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AutoCloseFD dirfd{open(dir.c_str(), O_RDONLY)};
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AutoCloseFD dirfd = toDescriptor(open(dir.c_str(), O_RDONLY));
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if (!dirfd) {
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if (errno == ENOENT) return;
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throw SysError("opening directory '%1%'", path);
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@ -436,11 +476,15 @@ Paths createDirs(const Path & path)
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if (path == "/") return created;
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struct stat st;
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if (lstat(path.c_str(), &st) == -1) {
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if (STAT(path.c_str(), &st) == -1) {
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created = createDirs(dirOf(path));
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if (mkdir(path.c_str(), 0777) == -1 && errno != EEXIST)
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if (mkdir(path.c_str()
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#ifndef _WIN32 // TODO abstract mkdir perms for Windows
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, 0777
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#endif
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) == -1 && errno != EEXIST)
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throw SysError("creating directory '%1%'", path);
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st = lstat(path);
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st = STAT(path);
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created.push_back(path);
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}
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@ -526,7 +570,11 @@ Path createTempDir(const Path & tmpRoot, const Path & prefix,
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while (1) {
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checkInterrupt();
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Path tmpDir = tempName(tmpRoot, prefix, includePid, counter);
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if (mkdir(tmpDir.c_str(), mode) == 0) {
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if (mkdir(tmpDir.c_str()
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#ifndef _WIN32 // TODO abstract mkdir perms for Windows
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, mode
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#endif
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) == 0) {
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#if __FreeBSD__
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/* Explicitly set the group of the directory. This is to
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work around around problems caused by BSD's group
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@ -552,17 +600,24 @@ std::pair<AutoCloseFD, Path> createTempFile(const Path & prefix)
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Path tmpl(defaultTempDir() + "/" + prefix + ".XXXXXX");
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// Strictly speaking, this is UB, but who cares...
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// FIXME: use O_TMPFILE.
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AutoCloseFD fd(mkstemp((char *) tmpl.c_str()));
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AutoCloseFD fd = toDescriptor(mkstemp((char *) tmpl.c_str()));
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if (!fd)
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throw SysError("creating temporary file '%s'", tmpl);
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#ifndef _WIN32
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closeOnExec(fd.get());
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#endif
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return {std::move(fd), tmpl};
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}
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void createSymlink(const Path & target, const Path & link)
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{
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#ifndef _WIN32
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if (symlink(target.c_str(), link.c_str()))
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throw SysError("creating symlink from '%1%' to '%2%'", link, target);
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#else
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// TODO modern Windows does in fact support symlinks
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throw UnimplementedError("createSymlink");
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#endif
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}
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void replaceSymlink(const Path & target, const Path & link)
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@ -583,7 +638,8 @@ void replaceSymlink(const Path & target, const Path & link)
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}
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}
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void setWriteTime(const fs::path & p, const struct stat & st)
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#ifndef _WIN32
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static void setWriteTime(const fs::path & p, const struct stat & st)
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{
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struct timeval times[2];
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times[0] = {
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@ -597,11 +653,14 @@ void setWriteTime(const fs::path & p, const struct stat & st)
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if (lutimes(p.c_str(), times) != 0)
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throw SysError("changing modification time of '%s'", p);
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}
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#endif
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void copy(const fs::directory_entry & from, const fs::path & to, bool andDelete)
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{
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#ifndef _WIN32
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// TODO: Rewrite the `is_*` to use `symlink_status()`
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auto statOfFrom = lstat(from.path().c_str());
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#endif
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auto fromStatus = from.symlink_status();
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// Mark the directory as writable so that we can delete its children
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@ -621,7 +680,9 @@ void copy(const fs::directory_entry & from, const fs::path & to, bool andDelete)
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throw Error("file '%s' has an unsupported type", from.path());
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}
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#ifndef _WIN32
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setWriteTime(to, statOfFrom);
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#endif
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if (andDelete) {
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if (!fs::is_symlink(fromStatus))
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fs::permissions(from.path(), fs::perms::owner_write, fs::perm_options::add | fs::perm_options::nofollow);
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@ -648,14 +709,18 @@ void moveFile(const Path & oldName, const Path & newName)
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auto newPath = fs::path(newName);
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// For the move to be as atomic as possible, copy to a temporary
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// directory
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fs::path temp = createTempDir(newPath.parent_path(), "rename-tmp");
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fs::path temp = createTempDir(
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os_string_to_string(PathViewNG { newPath.parent_path() }),
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"rename-tmp");
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Finally removeTemp = [&]() { fs::remove(temp); };
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auto tempCopyTarget = temp / "copy-target";
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if (e.code().value() == EXDEV) {
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fs::remove(newPath);
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warn("Can’t rename %s as %s, copying instead", oldName, newName);
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copy(fs::directory_entry(oldPath), tempCopyTarget, true);
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renameFile(tempCopyTarget, newPath);
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renameFile(
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os_string_to_string(PathViewNG { tempCopyTarget }),
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os_string_to_string(PathViewNG { newPath }));
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}
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}
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}
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