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