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Merge "Actually try making a userns before assuming they don't work" into main

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jade 2024-05-05 03:58:44 +00:00 committed by Gerrit Code Review
commit 47fb494676
1 changed files with 23 additions and 22 deletions
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45
src/libutil/namespaces.cc
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@ -8,31 +8,31 @@
namespace nix {
static void diagnoseUserNamespaces()
{
if (!pathExists("/proc/self/ns/user")) {
warn("'/proc/self/ns/user' does not exist; your kernel was likely built without CONFIG_USER_NS=y");
}
Path maxUserNamespaces = "/proc/sys/user/max_user_namespaces";
if (!pathExists(maxUserNamespaces) ||
trim(readFile(maxUserNamespaces)) == "0")
{
warn("user namespaces appear to be disabled; check '/proc/sys/user/max_user_namespaces'");
}
Path procSysKernelUnprivilegedUsernsClone = "/proc/sys/kernel/unprivileged_userns_clone";
if (pathExists(procSysKernelUnprivilegedUsernsClone)
&& trim(readFile(procSysKernelUnprivilegedUsernsClone)) == "0")
{
warn("user namespaces appear to be disabled for unprivileged users; check '/proc/sys/kernel/unprivileged_userns_clone'");
}
}
bool userNamespacesSupported()
{
static auto res = [&]() -> bool
{
if (!pathExists("/proc/self/ns/user")) {
debug("'/proc/self/ns/user' does not exist; your kernel was likely built without CONFIG_USER_NS=y");
return false;
}
Path maxUserNamespaces = "/proc/sys/user/max_user_namespaces";
if (!pathExists(maxUserNamespaces) ||
trim(readFile(maxUserNamespaces)) == "0")
{
debug("user namespaces appear to be disabled; check '/proc/sys/user/max_user_namespaces'");
return false;
}
Path procSysKernelUnprivilegedUsernsClone = "/proc/sys/kernel/unprivileged_userns_clone";
if (pathExists(procSysKernelUnprivilegedUsernsClone)
&& trim(readFile(procSysKernelUnprivilegedUsernsClone)) == "0")
{
debug("user namespaces appear to be disabled; check '/proc/sys/kernel/unprivileged_userns_clone'");
return false;
}
try {
Pid pid = startProcess([&]()
{
@ -44,7 +44,8 @@ bool userNamespacesSupported()
auto r = pid.wait();
assert(!r);
} catch (SysError & e) {
debug("user namespaces do not work on this system: %s", e.msg());
warn("user namespaces do not work on this system: %s", e.msg());
diagnoseUserNamespaces();
return false;
}