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// Copyright (c) 2022, Sylabs Inc. All rights reserved.
// This software is licensed under a 3-clause BSD license. Please consult the
// LICENSE.md file distributed with the sources of this project regarding your
// rights to use or distribute this software.
package launcher
import (
"fmt"
"os"
"strings"
"github.com/sylabs/singularity/v4/pkg/sylog"
"github.com/sylabs/singularity/v4/pkg/util/fs/proc"
)
// WithPrivilege calls fn if cond is satisfied, and we are uid 0.
func WithPrivilege(cond bool, desc string, fn func() error) error {
if !cond {
return nil
}
if os.Getuid() != 0 {
return fmt.Errorf("%s requires root privileges", desc)
}
return fn()
}
// HidepidProc checks if hidepid is set on the /proc mount point.
//
// If this is set then an instance started in the with setuid workflow cannot be
// joined later or stopped correctly.
func HidepidProc() bool {
entries, err := proc.GetMountInfoEntry("/proc/self/mountinfo")
if err != nil {
sylog.Warningf("while reading /proc/self/mountinfo: %s", err)
return false
}
for _, e := range entries {
if e.Point == "/proc" {
for _, o := range e.SuperOptions {
if strings.HasPrefix(o, "hidepid=") {
return true
}
}
}
}
return false
}
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