lix/src/resolve-system-dependencies/resolve-system-dependencies.cc

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#include "derivations.hh"
#include "globals.hh"
#include "shared.hh"
#include "store-api.hh"
#include <sys/utsname.h>
#include <algorithm>
#include <iostream>
#include <fstream>
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#include <sys/mman.h>
#include <fcntl.h>
#include <mach-o/loader.h>
#include <mach-o/swap.h>
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#define DO_SWAP(x, y) ((x) ? OSSwapInt32(y) : (y))
using namespace nix;
static auto cacheDir = Path{};
Path resolveCacheFile(Path lib)
{
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std::replace(lib.begin(), lib.end(), '/', '%');
return cacheDir + "/" + lib;
}
std::set<string> readCacheFile(const Path & file)
{
return tokenizeString<set<string>>(readFile(file), "\n");
}
void writeCacheFile(const Path & file, std::set<string> & deps)
{
std::ofstream fp;
fp.open(file);
for (auto & d : deps)
fp << d << "\n";
fp.close();
}
std::string findDylibName(bool should_swap, ptrdiff_t dylib_command_start)
{
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struct dylib_command *dylc = (struct dylib_command*)dylib_command_start;
return std::string((char*)(dylib_command_start + DO_SWAP(should_swap, dylc->dylib.name.offset)));
}
std::set<std::string> runResolver(const Path & filename)
{
AutoCloseFD fd = open(filename.c_str(), O_RDONLY);
if (!fd)
throw SysError("opening %s", filename);
struct stat st;
if (fstat(fd.get(), &st))
throw SysError("statting %s", filename);
if (!S_ISREG(st.st_mode)) {
printError("file %s is not a regular file", filename);
return {};
}
if (st.st_size < sizeof(mach_header_64)) {
printError("file %s is too short for a MACH binary", filename);
return {};
}
void *obj = mmap(NULL, st.st_size, PROT_READ, MAP_SHARED, fd.get(), 0);
if (!obj)
throw SysError("mmapping %s", filename);
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ptrdiff_t mach64_offset = 0;
uint32_t magic = ((struct mach_header_64*) obj)->magic;
if (magic == FAT_CIGAM || magic == FAT_MAGIC) {
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bool should_swap = magic == FAT_CIGAM;
uint32_t narches = DO_SWAP(should_swap, ((struct fat_header*)obj)->nfat_arch);
for (uint32_t iter = 0; iter < narches; iter++) {
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ptrdiff_t header_offset = (ptrdiff_t)obj + sizeof(struct fat_header) * (iter + 1);
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struct fat_arch* arch = (struct fat_arch*)header_offset;
if (DO_SWAP(should_swap, arch->cputype) == CPU_TYPE_X86_64) {
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mach64_offset = (ptrdiff_t)DO_SWAP(should_swap, arch->offset);
break;
}
}
if (mach64_offset == 0) {
printError(format("Could not find any mach64 blobs in file %1%, continuing...") % filename);
return {};
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}
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} else if (magic == MH_MAGIC_64 || magic == MH_CIGAM_64) {
mach64_offset = 0;
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} else {
printError(format("Object file has unknown magic number %1%, skipping it...") % magic);
return {};
}
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ptrdiff_t mach_header_offset = (ptrdiff_t)obj + mach64_offset;
struct mach_header_64 *m_header = (struct mach_header_64 *)mach_header_offset;
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bool should_swap = magic == MH_CIGAM_64;
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ptrdiff_t cmd_offset = mach_header_offset + sizeof(struct mach_header_64);
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std::set<string> libs;
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for(uint32_t i = 0; i < DO_SWAP(should_swap, m_header->ncmds); i++) {
struct load_command *cmd = (struct load_command*)cmd_offset;
switch(DO_SWAP(should_swap, cmd->cmd)) {
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case LC_LOAD_UPWARD_DYLIB:
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case LC_LOAD_DYLIB:
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case LC_REEXPORT_DYLIB:
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libs.insert(findDylibName(should_swap, cmd_offset));
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break;
}
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cmd_offset += DO_SWAP(should_swap, cmd->cmdsize);
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}
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return libs;
}
bool isSymlink(const Path & path)
{
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struct stat st;
if (lstat(path.c_str(), &st) == -1)
throw SysError("getting attributes of path %1%", path);
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return S_ISLNK(st.st_mode);
}
Path resolveSymlink(const Path & path)
{
auto target = readLink(path);
return hasPrefix(target, "/")
? target
: dirOf(path) + "/" + target;
}
std::set<string> resolveTree(const Path & path, PathSet & deps)
{
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std::set<string> results;
if (deps.count(path))
return {};
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deps.insert(path);
for (auto & lib : runResolver(path)) {
results.insert(lib);
for (auto & p : resolveTree(lib, deps)) {
results.insert(p);
}
}
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return results;
}
std::set<string> getPath(const Path & path)
{
if (hasPrefix(path, "/dev")) return {};
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Path cacheFile = resolveCacheFile(path);
if (pathExists(cacheFile))
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return readCacheFile(cacheFile);
std::set<string> deps, paths;
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paths.insert(path);
Path nextPath(path);
while (isSymlink(nextPath)) {
nextPath = resolveSymlink(nextPath);
paths.insert(nextPath);
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}
for (auto & t : resolveTree(nextPath, deps))
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paths.insert(t);
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writeCacheFile(cacheFile, paths);
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return paths;
}
int main(int argc, char ** argv)
{
return handleExceptions(argv[0], [&]() {
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initNix();
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struct utsname _uname;
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uname(&_uname);
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auto cacheParentDir = (format("%1%/dependency-maps") % settings.nixStateDir).str();
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cacheDir = (format("%1%/%2%-%3%-%4%")
% cacheParentDir
% _uname.machine
% _uname.sysname
% _uname.release).str();
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mkdir(cacheParentDir.c_str(), 0755);
mkdir(cacheDir.c_str(), 0755);
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auto store = openStore();
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auto drv = store->derivationFromPath(Path(argv[1]));
Strings impurePaths = tokenizeString<Strings>(get(drv.env, "__impureHostDeps"));
std::set<string> allPaths;
for (auto & path : impurePaths)
for (auto & p : getPath(path))
allPaths.insert(p);
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std::cout << "extra-chroot-dirs" << std::endl;
for (auto & path : allPaths)
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std::cout << path << std::endl;
std::cout << std::endl;
});
}