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package util
import (
"fmt"
"os"
"path/filepath"
"syscall"
"github.com/containers/podman/v2/pkg/rootless"
"github.com/containers/psgo"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
// GetContainerPidInformationDescriptors returns a string slice of all supported
// format descriptors of GetContainerPidInformation.
func GetContainerPidInformationDescriptors() ([]string, error) {
return psgo.ListDescriptors(), nil
}
// FindDeviceNodes parses /dev/ into a set of major:minor -> path, where
// [major:minor] is the device's major and minor numbers formatted as, for
// example, 2:0 and path is the path to the device node.
// Symlinks to nodes are ignored.
func FindDeviceNodes() (map[string]string, error) {
nodes := make(map[string]string)
err := filepath.Walk("/dev", func(path string, info os.FileInfo, err error) error {
if err != nil {
logrus.Warnf("Error descending into path %s: %v", path, err)
return filepath.SkipDir
}
// If we aren't a device node, do nothing.
if info.Mode()&(os.ModeDevice|os.ModeCharDevice) == 0 {
return nil
}
// We are a device node. Get major/minor.
sysstat, ok := info.Sys().(*syscall.Stat_t)
if !ok {
return errors.Errorf("Could not convert stat output for use")
}
major := sysstat.Rdev / 256
minor := sysstat.Rdev % 256
nodes[fmt.Sprintf("%d:%d", major, minor)] = path
return nil
})
if err != nil {
return nil, err
}
return nodes, nil
}
// CheckRootlessUIDRange checks the uid within the rootless container is in the range from /etc/subuid
func CheckRootlessUIDRange(uid int) error {
uids, _, err := rootless.GetConfiguredMappings()
if err != nil {
return err
}
total := 0
for _, u := range uids {
total += u.Size
}
if uid > total {
return errors.Errorf("requested user's UID %d is too large for the rootless user namespace", uid)
}
return nil
}
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