86 lines
2.3 KiB
Go
86 lines
2.3 KiB
Go
package jailer
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import (
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"context"
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"os"
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"os/exec"
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"path"
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"strconv"
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"strings"
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"sync"
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"time"
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"github.com/pkg/errors"
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"github.com/rancher/rancher/pkg/settings"
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"github.com/sirupsen/logrus"
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)
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const BaseJailPath = "/opt/jail"
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var lock = sync.Mutex{}
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// CreateJail sets up the named directory for use with chroot
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func CreateJail(name string) error {
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if os.Getenv("CATTLE_DEV_MODE") != "" {
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return os.MkdirAll(path.Join(BaseJailPath, name), 0700)
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}
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logrus.Debugf("CreateJail: called for [%s]", name)
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lock.Lock()
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defer lock.Unlock()
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jailPath := path.Join(BaseJailPath, name)
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logrus.Debugf("CreateJail: jailPath is [%s]", jailPath)
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// Check for the done file, if that exists the jail is ready to be used
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_, err := os.Stat(path.Join(jailPath, "done"))
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if err == nil {
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logrus.Debugf("CreateJail: done file found at [%s], jail is ready", path.Join(jailPath, "done"))
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return nil
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}
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// If the base dir exists without the done file rebuild the directory
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_, err = os.Stat(jailPath)
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if err == nil {
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logrus.Debugf("CreateJail: basedir for jail exists but no done file found, removing jailPath [%s]", jailPath)
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if err := os.RemoveAll(jailPath); err != nil {
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return err
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}
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}
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t := settings.JailerTimeout.Get()
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timeout, err := strconv.Atoi(t)
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if err != nil {
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timeout = 60
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logrus.Warnf("error converting jailer-timeout setting to int, using default of 60 seconds - error: [%v]", err)
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}
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logrus.Debugf("CreateJail: Running script to create jail for [%s]", name)
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ctx, cancel := context.WithTimeout(context.Background(), time.Duration(timeout)*time.Second)
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defer cancel()
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cmd := exec.CommandContext(ctx, "/usr/bin/jailer.sh", name)
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out, err := cmd.CombinedOutput()
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if len(out) > 0 {
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logrus.Tracef("CreateJail: output from jail script for [%s]: [%v]", name, string(out))
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} else {
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logrus.Tracef("CreateJail: no output from jail script for [%s]", name)
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}
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if err != nil {
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if strings.HasSuffix(err.Error(), "signal: killed") {
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return errors.WithMessage(err, "error running the jail command: timed out waiting for the script to complete")
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}
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return errors.WithMessage(err, "error running the jail command")
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}
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return nil
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}
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func getWhitelistedEnvVars(envvars []string) []string {
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settings.IterateWhitelistedEnvVars(func(name, value string) {
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envvars = append(envvars, name+"="+value)
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})
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return envvars
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}
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