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Save cwd fd instead of path #6386

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Save cwd fd instead of path #6386

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8 changes: 5 additions & 3 deletions src/libutil/util.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -1801,11 +1801,13 @@ void restoreMountNamespace()
{
#if __linux__
try {
auto savedCwd = absPath(".");

AutoCloseFD fdSavedCwd = open("/proc/self/cwd", O_RDONLY);
if (!fdSavedCwd) {
throw SysError("saving cwd");
}
if (fdSavedMountNamespace && setns(fdSavedMountNamespace.get(), CLONE_NEWNS) == -1)
throw SysError("restoring parent mount namespace");
if (chdir(savedCwd.c_str()) == -1) {
if (fdSavedCwd && fchdir(fdSavedCwd.get()) == -1) {
throw SysError("restoring cwd");
}
} catch (Error & e) {
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