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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>
#include <mach-o/loader.h>
#include <mach-o/swap.h>
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");
}
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(FILE *obj_file, struct load_command cmd) {
fpos_t pos;
fgetpos(obj_file, &pos);
struct dylib_command dylc;
dylc.cmd = cmd.cmd;
dylc.cmdsize = cmd.cmdsize;
fread(&dylc.dylib, sizeof(struct dylib), 1, obj_file);
char *dylib_name = (char*)calloc(cmd.cmdsize, sizeof(char));
fseek(obj_file,
// offset is calculated from the beginning of the load command, which is two
// uint32_t's backwards
dylc.dylib.name.offset - (sizeof(uint32_t) * 2) + pos,
SEEK_SET);
fread(dylib_name, sizeof(char), cmd.cmdsize, obj_file);
fseek(obj_file, pos, SEEK_SET);
return std::string(dylib_name);
}
bool seekMach64Blob(FILE *obj_file, enum NXByteOrder end) {
struct fat_header head;
fread(&head, sizeof(struct fat_header), 1, obj_file);
swap_fat_header(&head, end);
for(uint32_t narches = 0; narches < head.nfat_arch; narches++) {
struct fat_arch arch;
fread(&arch, sizeof(struct fat_arch), 1, obj_file);
swap_fat_arch(&arch, 1, end);
if(arch.cputype == CPU_TYPE_X86_64) {
fseek(obj_file, arch.offset, SEEK_SET);
return true;
}
}
return false;
}
std::set<std::string> runResolver(const Path & filename) {
FILE *obj_file = fopen(filename.c_str(), "rb");
uint32_t magic;
fread(&magic, sizeof(uint32_t), 1, obj_file);
fseek(obj_file, 0, SEEK_SET);
enum NXByteOrder endianness;
if(magic == 0xBEBAFECA) {
endianness = NX_BigEndian;
if(!seekMach64Blob(obj_file, endianness)) {
std::cerr << "Could not find any mach64 blobs in file " << filename << ", continuing..." << std::endl;
return std::set<string>();
}
}
struct mach_header_64 header;
fread(&header, sizeof(struct mach_header_64), 1, obj_file);
if(!(header.magic == MH_MAGIC_64 || header.magic == MH_CIGAM_64)) {
std::cerr << "Not a mach-o object file: " << filename << std::endl;
return std::set<string>();
}
std::set<string> libs;
for(uint32_t i = 0; i < header.ncmds; i++) {
struct load_command cmd;
fread(&cmd.cmd, sizeof(cmd.cmd), 1, obj_file);
fread(&cmd.cmdsize, sizeof(cmd.cmdsize), 1, obj_file);
switch(cmd.cmd) {
case LC_LOAD_DYLIB:
case LC_LOAD_UPWARD_DYLIB:
case LC_REEXPORT_DYLIB:
libs.insert(findDylibName(obj_file, cmd));
break;
}
fseek(obj_file, cmd.cmdsize - (sizeof(uint32_t) * 2), SEEK_CUR);
}
fclose(obj_file);
libs.erase(filename);
return libs;
}
bool isSymlink(const Path & path) {
struct stat st;
if(lstat(path.c_str(), &st))
throw SysError(format("getting attributes of path ‘%1%’") % path);
return S_ISLNK(st.st_mode);
}
Path resolveSymlink(const Path & path) {
char buf[PATH_MAX];
ssize_t len = readlink(path.c_str(), buf, sizeof(buf) - 1);
if(len != -1) {
buf[len] = 0;
return Path(buf);
} else {
throw SysError(format("readlink('%1%')") % path);
}
}
std::set<string> resolveTree(const Path & path, PathSet & deps) {
std::set<string> results;
if(deps.find(path) != deps.end()) {
return std::set<string>();
}
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) {
Path cacheFile = resolveCacheFile(path);
if(pathExists(cacheFile)) {
return readCacheFile(cacheFile);
}
std::set<string> deps;
std::set<string> paths;
paths.insert(path);
Path next_path = Path(path);
while(isSymlink(next_path)) {
next_path = resolveSymlink(next_path);
paths.insert(next_path);
}
for(auto & t : resolveTree(next_path, deps)) {
paths.insert(t);
}
writeCacheFile(cacheFile, paths);
return paths;
}
int main(int argc, char ** argv) {
return handleExceptions(argv[0], [&]() {
initNix();
struct utsname _uname;
uname(&_uname);
cacheDir = (format("%1%/dependency-maps/%2%-%3%-%4%")
% settings.nixStateDir
% _uname.machine
% _uname.sysname
% _uname.release).str();
auto store = openStore();
auto drv = store->derivationFromPath(Path(argv[1]));
Strings impurePaths = tokenizeString<Strings>(get(drv.env, "__impureHostDeps"));
std::set<string> all_paths;
for (auto & path : impurePaths) {
for(auto & p : getPath(path)) {
all_paths.insert(p);
}
}
std::cout << "extra-chroot-dirs" << std::endl;
for(auto & path : all_paths) {
std::cout << path << std::endl;
}
std::cout << std::endl;
});
}
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