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libutil: Don't use std::filesystem

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Just in case making libutil depend on std::filesystem is unacceptable,
here is the non-filesystem approach.
This commit is contained in:
Cole Helbling 2022-04-01 10:24:31 -07:00
parent 435848cef1
commit 7f5caaa7c0
1 changed files with 8 additions and 8 deletions
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16
src/libutil/util.cc
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@ -10,7 +10,6 @@
#include <cstdio> #include <cstdio>
#include <cstdlib> #include <cstdlib>
#include <cstring> #include <cstring>
#include <filesystem>
#include <future> #include <future>
#include <iostream> #include <iostream>
#include <mutex> #include <mutex>
@ -1691,7 +1690,7 @@ void setStackSize(size_t stackSize)
#if __linux__ #if __linux__
static AutoCloseFD fdSavedMountNamespace; static AutoCloseFD fdSavedMountNamespace;
std::optional<std::filesystem::path> savedCwd; std::optional<Path> savedCwd;
#endif #endif
void saveMountNamespace() void saveMountNamespace()
@ -1699,7 +1698,11 @@ void saveMountNamespace()
#if __linux__ #if __linux__
static std::once_flag done; static std::once_flag done;
std::call_once(done, []() { std::call_once(done, []() {
savedCwd.emplace(std::filesystem::current_path()); char* cwd = getcwd(NULL, 0);
if (cwd == NULL) throw SysError("getting cwd");
savedCwd.emplace(cwd);
free(cwd);
AutoCloseFD fd = open("/proc/self/ns/mnt", O_RDONLY); AutoCloseFD fd = open("/proc/self/ns/mnt", O_RDONLY);
if (!fd) if (!fd)
throw SysError("saving parent mount namespace"); throw SysError("saving parent mount namespace");
@ -1717,11 +1720,8 @@ void restoreMountNamespace()
} catch (Error & e) { } catch (Error & e) {
debug(e.msg()); debug(e.msg());
} }
try { if (savedCwd && chdir(savedCwd->c_str()) == -1) {
if (savedCwd) throw SysError("restoring cwd");
std::filesystem::current_path(*savedCwd);
} catch (std::filesystem::filesystem_error const &e) {
debug(e.what());
} }
#endif #endif
} }