mirror of
https://github.com/openfaas/faasd.git
synced 2025-06-17 12:46:57 +00:00
1c1bfa6759
* Fixes upstream deprecations for containerd * Fixes deprecations in ioutil package usage * Break out separate files for function handlers * Upgrades containerd to 1.7.22 * Fixes default namespace functionality * Pre-deploy checks as per license agreement * Removes extra log messages for payload in HTTP handlers, you can enable FAAS_DEBUG=1 in the CLI instead to see this from the client's perspective * Add additional Google DNS server 8.8.4.4 for functions Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>
54 lines
1.4 KiB
Go
Generated
54 lines
1.4 KiB
Go
Generated
package userns
|
|
|
|
import (
|
|
"bufio"
|
|
"fmt"
|
|
"os"
|
|
"sync"
|
|
)
|
|
|
|
var inUserNS = sync.OnceValue(runningInUserNS)
|
|
|
|
// runningInUserNS detects whether we are currently running in a user namespace.
|
|
//
|
|
// This code was migrated from [libcontainer/runc] and based on an implementation
|
|
// from [lcx/incus].
|
|
//
|
|
// [libcontainer/runc]: https://github.com/opencontainers/runc/blob/3778ae603c706494fd1e2c2faf83b406e38d687d/libcontainer/userns/userns_linux.go#L12-L49
|
|
// [lcx/incus]: https://github.com/lxc/incus/blob/e45085dd42f826b3c8c3228e9733c0b6f998eafe/shared/util.go#L678-L700
|
|
func runningInUserNS() bool {
|
|
file, err := os.Open("/proc/self/uid_map")
|
|
if err != nil {
|
|
// This kernel-provided file only exists if user namespaces are supported.
|
|
return false
|
|
}
|
|
defer file.Close()
|
|
|
|
buf := bufio.NewReader(file)
|
|
l, _, err := buf.ReadLine()
|
|
if err != nil {
|
|
return false
|
|
}
|
|
|
|
return uidMapInUserNS(string(l))
|
|
}
|
|
|
|
func uidMapInUserNS(uidMap string) bool {
|
|
if uidMap == "" {
|
|
// File exist but empty (the initial state when userns is created,
|
|
// see user_namespaces(7)).
|
|
return true
|
|
}
|
|
|
|
var a, b, c int64
|
|
if _, err := fmt.Sscanf(uidMap, "%d %d %d", &a, &b, &c); err != nil {
|
|
// Assume we are in a regular, non user namespace.
|
|
return false
|
|
}
|
|
|
|
// As per user_namespaces(7), /proc/self/uid_map of
|
|
// the initial user namespace shows 0 0 4294967295.
|
|
initNS := a == 0 && b == 0 && c == 4294967295
|
|
return !initNS
|
|
}
|