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//go:build linux
package buildah
import (
"context"
"errors"
"fmt"
"maps"
"os"
"path/filepath"
"slices"
"strings"
"sync"
"syscall"
"github.com/containers/buildah/bind"
"github.com/containers/buildah/chroot"
"github.com/containers/buildah/copier"
"github.com/containers/buildah/define"
"github.com/containers/buildah/internal"
"github.com/containers/buildah/internal/tmpdir"
"github.com/containers/buildah/internal/volumes"
"github.com/containers/buildah/pkg/binfmt"
"github.com/containers/buildah/pkg/overlay"
"github.com/containers/buildah/pkg/parse"
butil "github.com/containers/buildah/pkg/util"
"github.com/containers/buildah/util"
"github.com/containers/common/libnetwork/etchosts"
"github.com/containers/common/libnetwork/pasta"
"github.com/containers/common/libnetwork/resolvconf"
"github.com/containers/common/libnetwork/slirp4netns"
nettypes "github.com/containers/common/libnetwork/types"
netUtil "github.com/containers/common/libnetwork/util"
"github.com/containers/common/pkg/capabilities"
"github.com/containers/common/pkg/chown"
"github.com/containers/common/pkg/config"
"github.com/containers/common/pkg/hooks"
hooksExec "github.com/containers/common/pkg/hooks/exec"
"github.com/containers/image/v5/types"
"github.com/containers/storage/pkg/fileutils"
"github.com/containers/storage/pkg/idtools"
"github.com/containers/storage/pkg/ioutils"
"github.com/containers/storage/pkg/lockfile"
"github.com/containers/storage/pkg/mount"
"github.com/containers/storage/pkg/stringid"
"github.com/containers/storage/pkg/unshare"
"github.com/docker/go-units"
"github.com/opencontainers/runtime-spec/specs-go"
"github.com/opencontainers/runtime-tools/generate"
"github.com/sirupsen/logrus"
"golang.org/x/sys/unix"
"tags.cncf.io/container-device-interface/pkg/cdi"
"tags.cncf.io/container-device-interface/pkg/parser"
)
// binfmtRegistered makes sure we only try to register binfmt_misc
// interpreters once, the first time we handle a RUN instruction.
var binfmtRegistered sync.Once
func setChildProcess() error {
if err := unix.Prctl(unix.PR_SET_CHILD_SUBREAPER, uintptr(1), 0, 0, 0); err != nil {
fmt.Fprintf(os.Stderr, "prctl(PR_SET_CHILD_SUBREAPER, 1): %v\n", err)
return err
}
return nil
}
func (b *Builder) cdiSetupDevicesInSpec(deviceSpecs []string, configDir string, spec *specs.Spec) ([]string, error) {
var configDirs []string
defConfig, err := config.Default()
if err != nil {
return nil, fmt.Errorf("failed to get container config: %w", err)
}
// The CDI cache prioritizes entries from directories that are later in
// the list of ones it scans, so start with our general config, then
// append values passed to us through API layers.
configDirs = slices.Clone(defConfig.Engine.CdiSpecDirs.Get())
if b.CDIConfigDir != "" {
configDirs = append(configDirs, b.CDIConfigDir)
}
if configDir != "" {
configDirs = append(configDirs, configDir)
}
if len(configDirs) == 0 {
// No directories to scan for CDI configuration means that CDI
// won't have any details for setting up any devices, so we
// don't need to be doing anything here.
return deviceSpecs, nil
}
var qualifiedDeviceSpecs, unqualifiedDeviceSpecs []string
for _, deviceSpec := range deviceSpecs {
if parser.IsQualifiedName(deviceSpec) {
qualifiedDeviceSpecs = append(qualifiedDeviceSpecs, deviceSpec)
} else {
unqualifiedDeviceSpecs = append(unqualifiedDeviceSpecs, deviceSpec)
}
}
if len(qualifiedDeviceSpecs) == 0 {
// None of the specified devices were in the form that would be
// handled by CDI, so we don't need to do anything here.
return deviceSpecs, nil
}
if err := cdi.Configure(cdi.WithSpecDirs(configDirs...)); err != nil {
return nil, fmt.Errorf("CDI default registry ignored configured directories %v: %w", configDirs, err)
}
leftoverDevices := slices.Clone(deviceSpecs)
if err := cdi.Refresh(); err != nil {
logrus.Warnf("CDI default registry refresh: %v", err)
} else {
leftoverDevices, err = cdi.InjectDevices(spec, qualifiedDeviceSpecs...)
if err != nil {
return nil, fmt.Errorf("CDI device injection (leftover devices: %v): %w", leftoverDevices, err)
}
}
removed := slices.DeleteFunc(slices.Clone(deviceSpecs), func(t string) bool { return slices.Contains(leftoverDevices, t) })
logrus.Debugf("CDI taking care of devices %v, leaving devices %v, skipped %v", removed, leftoverDevices, unqualifiedDeviceSpecs)
return append(leftoverDevices, unqualifiedDeviceSpecs...), nil
}
// Extract the device list so that we can still try to make it work if
// we're running rootless and can't just mknod() the device nodes.
func separateDevicesFromRuntimeSpec(g *generate.Generator) define.ContainerDevices {
var result define.ContainerDevices
if g.Config != nil && g.Config.Linux != nil {
for _, device := range g.Config.Linux.Devices {
var bDevice define.BuildahDevice
bDevice.Path = device.Path
switch device.Type {
case "b":
bDevice.Type = 'b'
case "c":
bDevice.Type = 'c'
case "u":
bDevice.Type = 'u'
case "p":
bDevice.Type = 'p'
}
bDevice.Major = device.Major
bDevice.Minor = device.Minor
if device.FileMode != nil {
bDevice.FileMode = *device.FileMode
}
if device.UID != nil {
bDevice.Uid = *device.UID
}
if device.GID != nil {
bDevice.Gid = *device.GID
}
bDevice.Source = device.Path
bDevice.Destination = device.Path
result = append(result, bDevice)
}
}
g.ClearLinuxDevices()
return result
}
// Run runs the specified command in the container's root filesystem.
func (b *Builder) Run(command []string, options RunOptions) error {
var runArtifacts *runMountArtifacts
if len(options.ExternalImageMounts) > 0 {
defer func() {
if runArtifacts == nil {
// we didn't add ExternalImageMounts to the
// list of images that we're going to unmount
// yet and make a deferred call that cleans
// them up, but the caller is expecting us to
// unmount these for them because we offered to
for _, image := range options.ExternalImageMounts {
if _, err := b.store.UnmountImage(image, false); err != nil {
logrus.Debugf("umounting image %q: %v", image, err)
}
}
}
}()
}
if os.Getenv("container") != "" {
os, arch, variant, err := parse.Platform("")
if err != nil {
return fmt.Errorf("reading the current default platform")
}
platform := b.OCIv1.Platform
if os != platform.OS || arch != platform.Architecture || variant != platform.Variant {
binfmtRegistered.Do(func() {
if err := binfmt.Register(nil); err != nil {
logrus.Warnf("registering binfmt_misc interpreters: %v", err)
}
})
}
}
p, err := os.MkdirTemp(tmpdir.GetTempDir(), define.Package)
if err != nil {
return err
}
// On some hosts like AH, /tmp is a symlink and we need an
// absolute path.
path, err := filepath.EvalSymlinks(p)
if err != nil {
return err
}
logrus.Debugf("using %q to hold bundle data", path)
defer func() {
if err2 := os.RemoveAll(path); err2 != nil {
options.Logger.Error(err2)
}
}()
gp, err := generate.New("linux")
if err != nil {
return fmt.Errorf("generating new 'linux' runtime spec: %w", err)
}
g := &gp
isolation := options.Isolation
if isolation == define.IsolationDefault {
isolation = b.Isolation
if isolation == define.IsolationDefault {
isolation, err = parse.IsolationOption("")
if err != nil {
logrus.Debugf("got %v while trying to determine default isolation, guessing OCI", err)
isolation = IsolationOCI
} else if isolation == IsolationDefault {
isolation = IsolationOCI
}
}
}
if err := checkAndOverrideIsolationOptions(isolation, &options); err != nil {
return err
}
// hardwire the environment to match docker build to avoid subtle and hard-to-debug differences due to containers.conf
b.configureEnvironment(g, options, []string{"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"})
if b.CommonBuildOpts == nil {
return fmt.Errorf("invalid format on container you must recreate the container")
}
if err := addCommonOptsToSpec(b.CommonBuildOpts, g); err != nil {
return err
}
workDir := b.WorkDir()
if options.WorkingDir != "" {
g.SetProcessCwd(options.WorkingDir)
workDir = options.WorkingDir
} else if b.WorkDir() != "" {
g.SetProcessCwd(b.WorkDir())
workDir = b.WorkDir()
}
if workDir == "" {
workDir = string(os.PathSeparator)
}
setupSelinux(g, b.ProcessLabel, b.MountLabel)
mountPoint, err := b.Mount(b.MountLabel)
if err != nil {
return fmt.Errorf("mounting container %q: %w", b.ContainerID, err)
}
defer func() {
if err := b.Unmount(); err != nil {
options.Logger.Errorf("error unmounting container: %v", err)
}
}()
g.SetRootPath(mountPoint)
if len(command) > 0 {
command = runLookupPath(g, command)
g.SetProcessArgs(command)
} else {
g.SetProcessArgs(nil)
}
// Combine the working container's set of devices with the ones for just this run.
deviceSpecs := slices.Concat(options.DeviceSpecs, b.DeviceSpecs)
deviceSpecs, err = b.cdiSetupDevicesInSpec(deviceSpecs, options.CDIConfigDir, g.Config) // makes changes to more than just the device list
if err != nil {
return err
}
devices := separateDevicesFromRuntimeSpec(g)
for _, deviceSpec := range deviceSpecs {
device, err := parse.DeviceFromPath(deviceSpec)
if err != nil {
return fmt.Errorf("setting up device %q: %w", deviceSpec, err)
}
devices = append(devices, device...)
}
devices = append(append(devices, options.Devices...), b.Devices...)
// Mount devices, if any, and if we're rootless attempt to work around not
// being able to create device nodes by bind-mounting them from the host, like podman does.
if unshare.IsRootless() {
// We are going to create bind mounts for devices
// but we need to make sure that we don't override
// anything which is already in OCI spec.
mounts := make(map[string]any)
for _, m := range g.Mounts() {
mounts[m.Destination] = true
}
newMounts := []specs.Mount{}
for _, d := range devices {
// Default permission is read-only.
perm := "ro"
// Get permission configured for this device but only process `write`
// permission in rootless since `mknod` is not supported anyways.
if strings.Contains(string(d.Rule.Permissions), "w") {
perm = "rw"
}
devMnt := specs.Mount{
Destination: d.Destination,
Type: parse.TypeBind,
Source: d.Source,
Options: []string{"slave", "nosuid", "noexec", perm, "rbind"},
}
// Podman parity: podman skips these two devices hence we do the same.
if d.Path == "/dev/ptmx" || strings.HasPrefix(d.Path, "/dev/tty") {
continue
}
// Device is already in OCI spec do not re-mount.
if _, found := mounts[d.Path]; found {
continue
}
newMounts = append(newMounts, devMnt)
}
g.Config.Mounts = append(newMounts, g.Config.Mounts...)
} else {
for _, d := range devices {
sDev := specs.LinuxDevice{
Type: string(d.Type),
Path: d.Path,
Major: d.Major,
Minor: d.Minor,
FileMode: &d.FileMode,
UID: &d.Uid,
GID: &d.Gid,
}
g.AddDevice(sDev)
g.AddLinuxResourcesDevice(true, string(d.Type), &d.Major, &d.Minor, string(d.Permissions))
}
}
setupMaskedPaths(g, b.CommonBuildOpts)
setupReadOnlyPaths(g)
setupTerminal(g, options.Terminal, options.TerminalSize)
configureNetwork, networkString, err := b.configureNamespaces(g, &options)
if err != nil {
return err
}
homeDir, err := b.configureUIDGID(g, mountPoint, options)
if err != nil {
return err
}
g.SetProcessNoNewPrivileges(b.CommonBuildOpts.NoNewPrivileges)
g.SetProcessApparmorProfile(b.CommonBuildOpts.ApparmorProfile)
// Now grab the spec from the generator. Set the generator to nil so that future contributors
// will quickly be able to tell that they're supposed to be modifying the spec directly from here.
spec := g.Config
g = nil
// Set the seccomp configuration using the specified profile name. Some syscalls are
// allowed if certain capabilities are to be granted (example: CAP_SYS_CHROOT and chroot),
// so we sorted out the capabilities lists first.
if err = setupSeccomp(spec, b.CommonBuildOpts.SeccompProfilePath); err != nil {
return err
}
uid, gid := spec.Process.User.UID, spec.Process.User.GID
if spec.Linux != nil {
uid, gid, err = util.GetHostIDs(spec.Linux.UIDMappings, spec.Linux.GIDMappings, uid, gid)
if err != nil {
return err
}
}
idPair := &idtools.IDPair{UID: int(uid), GID: int(gid)}
mode := os.FileMode(0o755)
coptions := copier.MkdirOptions{
ChownNew: idPair,
ChmodNew: &mode,
}
if err := copier.Mkdir(mountPoint, filepath.Join(mountPoint, spec.Process.Cwd), coptions); err != nil {
return err
}
bindFiles := make(map[string]string)
volumes := b.Volumes()
// Figure out who owns files that will appear to be owned by UID/GID 0 in the container.
rootUID, rootGID, err := util.GetHostRootIDs(spec)
if err != nil {
return err
}
rootIDPair := &idtools.IDPair{UID: int(rootUID), GID: int(rootGID)}
hostsFile := ""
if !options.NoHosts && !slices.Contains(volumes, config.DefaultHostsFile) && options.ConfigureNetwork != define.NetworkDisabled {
hostsFile, err = b.createHostsFile(path, rootIDPair)
if err != nil {
return err
}
bindFiles[config.DefaultHostsFile] = hostsFile
// Only add entries here if we do not have to do setup network,
// if we do we have to do it much later after the network setup.
if !configureNetwork {
var entries etchosts.HostEntries
isHost := true
if spec.Linux != nil {
for _, ns := range spec.Linux.Namespaces {
if ns.Type == specs.NetworkNamespace {
isHost = false
break
}
}
}
// add host entry for local ip when running in host network
if spec.Hostname != "" && isHost {
ip := netUtil.GetLocalIP()
if ip != "" {
entries = append(entries, etchosts.HostEntry{
Names: []string{spec.Hostname},
IP: ip,
})
}
}
err = b.addHostsEntries(hostsFile, mountPoint, entries, nil, "")
if err != nil {
return err
}
}
}
if !options.NoHostname && !(slices.Contains(volumes, "/etc/hostname")) {
hostnameFile, err := b.generateHostname(path, spec.Hostname, rootIDPair)
if err != nil {
return err
}
// Bind /etc/hostname
bindFiles["/etc/hostname"] = hostnameFile
}
resolvFile := ""
if !slices.Contains(volumes, resolvconf.DefaultResolvConf) && options.ConfigureNetwork != define.NetworkDisabled && (len(b.CommonBuildOpts.DNSServers) != 1 || strings.ToLower(b.CommonBuildOpts.DNSServers[0]) != "none") {
resolvFile, err = b.createResolvConf(path, rootIDPair)
if err != nil {
return err
}
bindFiles[resolvconf.DefaultResolvConf] = resolvFile
// Only add entries here if we do not have to do setup network,
// if we do we have to do it much later after the network setup.
if !configureNetwork {
err = b.addResolvConfEntries(resolvFile, nil, spec, false, true)
if err != nil {
return err
}
}
}
// Empty file, so no need to recreate if it exists
if _, ok := bindFiles["/run/.containerenv"]; !ok {
containerenvPath := filepath.Join(path, "/run/.containerenv")
if err = os.MkdirAll(filepath.Dir(containerenvPath), 0o755); err != nil {
return err
}
rootless := 0
if unshare.IsRootless() {
rootless = 1
}
// Populate the .containerenv with container information
containerenv := fmt.Sprintf(`
engine="buildah-%s"
name=%q
id=%q
image=%q
imageid=%q
rootless=%d
`, define.Version, b.Container, b.ContainerID, b.FromImage, b.FromImageID, rootless)
if err = ioutils.AtomicWriteFile(containerenvPath, []byte(containerenv), 0o755); err != nil {
return err
}
if err := relabel(containerenvPath, b.MountLabel, false); err != nil {
return err
}
bindFiles["/run/.containerenv"] = containerenvPath
}
// Setup OCI hooks
_, err = b.setupOCIHooks(spec, (len(options.Mounts) > 0 || len(volumes) > 0))
if err != nil {
return fmt.Errorf("unable to setup OCI hooks: %w", err)
}
runMountInfo := runMountInfo{
WorkDir: workDir,
ContextDir: options.ContextDir,
Secrets: options.Secrets,
SSHSources: options.SSHSources,
StageMountPoints: options.StageMountPoints,
SystemContext: options.SystemContext,
}
runArtifacts, err = b.setupMounts(mountPoint, spec, path, options.Mounts, bindFiles, volumes, options.CompatBuiltinVolumes, b.CommonBuildOpts.Volumes, options.RunMounts, runMountInfo)
if err != nil {
return fmt.Errorf("resolving mountpoints for container %q: %w", b.ContainerID, err)
}
if runArtifacts.SSHAuthSock != "" {
sshenv := "SSH_AUTH_SOCK=" + runArtifacts.SSHAuthSock
spec.Process.Env = append(spec.Process.Env, sshenv)
}
// Create any mount points that we need that aren't already present in
// the rootfs.
createdMountTargets, err := b.createMountTargets(spec)
if err != nil {
return fmt.Errorf("ensuring mount targets for container %q: %w", b.ContainerID, err)
}
defer func() {
// Attempt to clean up mount targets for the sake of builds
// that don't commit and rebase at each step, and people using
// `buildah run` more than once, who don't expect empty mount
// points to stick around. They'll still get filtered out at
// commit-time if another concurrent Run() is keeping something
// busy.
if _, err := copier.ConditionalRemove(mountPoint, mountPoint, copier.ConditionalRemoveOptions{
UIDMap: b.store.UIDMap(),
GIDMap: b.store.GIDMap(),
Paths: createdMountTargets,
}); err != nil {
options.Logger.Errorf("unable to cleanup run mount targets %v", err)
}
}()
// following run was called from `buildah run`
// and some images were mounted for this run
// add them to cleanup artifacts
if len(options.ExternalImageMounts) > 0 {
runArtifacts.MountedImages = append(runArtifacts.MountedImages, options.ExternalImageMounts...)
}
defer func() {
if err := b.cleanupRunMounts(runArtifacts); err != nil {
options.Logger.Errorf("unable to cleanup run mounts %v", err)
}
}()
// Handle mount flags that request that the source locations for "bind" mountpoints be
// relabeled, and filter those flags out of the list of mount options we pass to the
// runtime.
for i := range spec.Mounts {
switch spec.Mounts[i].Type {
default:
continue
case "bind", "rbind":
// all good, keep going
}
zflag := ""
for _, opt := range spec.Mounts[i].Options {
if opt == "z" || opt == "Z" {
zflag = opt
}
}
if zflag == "" {
continue
}
spec.Mounts[i].Options = slices.DeleteFunc(spec.Mounts[i].Options, func(opt string) bool {
return opt == "z" || opt == "Z"
})
if err := relabel(spec.Mounts[i].Source, b.MountLabel, zflag == "z"); err != nil {
return fmt.Errorf("setting file label %q on %q: %w", b.MountLabel, spec.Mounts[i].Source, err)
}
}
switch isolation {
case define.IsolationOCI:
var moreCreateArgs []string
if options.NoPivot {
moreCreateArgs = append(moreCreateArgs, "--no-pivot")
}
err = b.runUsingRuntimeSubproc(isolation, options, configureNetwork, networkString, moreCreateArgs, spec,
mountPoint, path, define.Package+"-"+filepath.Base(path), b.Container, hostsFile, resolvFile)
case IsolationChroot:
err = chroot.RunUsingChroot(spec, path, homeDir, options.Stdin, options.Stdout, options.Stderr, options.NoPivot)
case IsolationOCIRootless:
moreCreateArgs := []string{"--no-new-keyring"}
if options.NoPivot {
moreCreateArgs = append(moreCreateArgs, "--no-pivot")
}
err = b.runUsingRuntimeSubproc(isolation, options, configureNetwork, networkString, moreCreateArgs, spec,
mountPoint, path, define.Package+"-"+filepath.Base(path), b.Container, hostsFile, resolvFile)
default:
err = errors.New("don't know how to run this command")
}
return err
}
func (b *Builder) setupOCIHooks(config *specs.Spec, hasVolumes bool) (map[string][]specs.Hook, error) {
allHooks := make(map[string][]specs.Hook)
if len(b.CommonBuildOpts.OCIHooksDir) == 0 {
if unshare.IsRootless() {
return nil, nil
}
for _, hDir := range []string{hooks.DefaultDir, hooks.OverrideDir} {
manager, err := hooks.New(context.Background(), []string{hDir}, []string{})
if err != nil {
if errors.Is(err, os.ErrNotExist) {
continue
}
return nil, err
}
ociHooks, err := manager.Hooks(config, b.ImageAnnotations, hasVolumes)
if err != nil {
return nil, err
}
if len(ociHooks) > 0 || config.Hooks != nil {
logrus.Warnf("Implicit hook directories are deprecated; set --hooks-dir=%q explicitly to continue to load ociHooks from this directory", hDir)
}
maps.Copy(allHooks, ociHooks)
}
} else {
manager, err := hooks.New(context.Background(), b.CommonBuildOpts.OCIHooksDir, []string{})
if err != nil {
return nil, err
}
allHooks, err = manager.Hooks(config, b.ImageAnnotations, hasVolumes)
if err != nil {
return nil, err
}
}
hookErr, err := hooksExec.RuntimeConfigFilter(context.Background(), allHooks["precreate"], config, hooksExec.DefaultPostKillTimeout) //nolint:staticcheck
if err != nil {
logrus.Warnf("Container: precreate hook: %v", err)
if hookErr != nil && hookErr != err {
logrus.Debugf("container: precreate hook (hook error): %v", hookErr)
}
return nil, err
}
return allHooks, nil
}
func addCommonOptsToSpec(commonOpts *define.CommonBuildOptions, g *generate.Generator) error {
// Resources - CPU
if commonOpts.CPUPeriod != 0 {
g.SetLinuxResourcesCPUPeriod(commonOpts.CPUPeriod)
}
if commonOpts.CPUQuota != 0 {
g.SetLinuxResourcesCPUQuota(commonOpts.CPUQuota)
}
if commonOpts.CPUShares != 0 {
g.SetLinuxResourcesCPUShares(commonOpts.CPUShares)
}
if commonOpts.CPUSetCPUs != "" {
g.SetLinuxResourcesCPUCpus(commonOpts.CPUSetCPUs)
}
if commonOpts.CPUSetMems != "" {
g.SetLinuxResourcesCPUMems(commonOpts.CPUSetMems)
}
// Resources - Memory
if commonOpts.Memory != 0 {
g.SetLinuxResourcesMemoryLimit(commonOpts.Memory)
}
if commonOpts.MemorySwap != 0 {
g.SetLinuxResourcesMemorySwap(commonOpts.MemorySwap)
}
// cgroup membership
if commonOpts.CgroupParent != "" {
g.SetLinuxCgroupsPath(commonOpts.CgroupParent)
}
defaultContainerConfig, err := config.Default()
if err != nil {
return fmt.Errorf("failed to get container config: %w", err)
}
// Other process resource limits
if err := addRlimits(commonOpts.Ulimit, g, defaultContainerConfig.Containers.DefaultUlimits.Get()); err != nil {
return err
}
logrus.Debugf("Resources: %#v", commonOpts)
return nil
}
func setupSlirp4netnsNetwork(config *config.Config, netns, cid string, options, hostnames []string) (func(), *netResult, error) {
// we need the TmpDir for the slirp4netns code
if err := os.MkdirAll(config.Engine.TmpDir, 0o751); err != nil {
return nil, nil, fmt.Errorf("failed to create tempdir: %w", err)
}
res, err := slirp4netns.Setup(&slirp4netns.SetupOptions{
Config: config,
ContainerID: cid,
Netns: netns,
ExtraOptions: options,
Pdeathsig: syscall.SIGKILL,
})
if err != nil {
return nil, nil, err
}
ip, err := slirp4netns.GetIP(res.Subnet)
if err != nil {
return nil, nil, fmt.Errorf("get slirp4netns ip: %w", err)
}
dns, err := slirp4netns.GetDNS(res.Subnet)
if err != nil {
return nil, nil, fmt.Errorf("get slirp4netns dns ip: %w", err)
}
result := &netResult{
entries: etchosts.HostEntries{{IP: ip.String(), Names: hostnames}},
dnsServers: []string{dns.String()},
ipv6: res.IPv6,
keepHostResolvers: true,
}
return func() {
syscall.Kill(res.Pid, syscall.SIGKILL) //nolint:errcheck
var status syscall.WaitStatus
syscall.Wait4(res.Pid, &status, 0, nil) //nolint:errcheck
}, result, nil
}
func setupPasta(config *config.Config, netns string, options, hostnames []string) (func(), *netResult, error) {
res, err := pasta.Setup(&pasta.SetupOptions{
Config: config,
Netns: netns,
ExtraOptions: options,
})
if err != nil {
return nil, nil, err
}
var entries etchosts.HostEntries
if len(res.IPAddresses) > 0 {
entries = etchosts.HostEntries{{IP: res.IPAddresses[0].String(), Names: hostnames}}
}
mappedIP := ""
if len(res.MapGuestAddrIPs) > 0 {
mappedIP = res.MapGuestAddrIPs[0]
}
result := &netResult{
entries: entries,
dnsServers: res.DNSForwardIPs,
excludeIPs: res.IPAddresses,
ipv6: res.IPv6,
keepHostResolvers: true,
preferredHostContainersInternalIP: mappedIP,
}
return nil, result, nil
}
func (b *Builder) runConfigureNetwork(pid int, isolation define.Isolation, options RunOptions, network, containerName string, hostnames []string) (func(), *netResult, error) {
netns := fmt.Sprintf("/proc/%d/ns/net", pid)
var configureNetworks []string
defConfig, err := config.Default()
if err != nil {
return nil, nil, fmt.Errorf("failed to get container config: %w", err)
}
name, networkOpts, hasOpts := strings.Cut(network, ":")
var netOpts []string
if hasOpts {
netOpts = strings.Split(networkOpts, ",")
}
if isolation == IsolationOCIRootless && name == "" {
switch defConfig.Network.DefaultRootlessNetworkCmd {
case slirp4netns.BinaryName, "":
name = slirp4netns.BinaryName
case pasta.BinaryName:
name = pasta.BinaryName
default:
return nil, nil, fmt.Errorf("invalid default_rootless_network_cmd option %q",
defConfig.Network.DefaultRootlessNetworkCmd)
}
}
switch {
case name == slirp4netns.BinaryName:
return setupSlirp4netnsNetwork(defConfig, netns, containerName, netOpts, hostnames)
case name == pasta.BinaryName:
return setupPasta(defConfig, netns, netOpts, hostnames)
// Basically default case except we make sure to not split an empty
// name as this would return a slice with one empty string which is
// not a valid network name.
case len(network) > 0:
// old syntax allow comma separated network names
configureNetworks = strings.Split(network, ",")
}
if isolation == IsolationOCIRootless {
return nil, nil, errors.New("cannot use networks as rootless")
}
if len(configureNetworks) == 0 {
configureNetworks = []string{b.NetworkInterface.DefaultNetworkName()}
}
// Make sure we can access the container's network namespace,
// even after it exits, to successfully tear down the
// interfaces. Ensure this by opening a handle to the network
// namespace, and using our copy to both configure and
// deconfigure it.
netFD, err := unix.Open(netns, unix.O_RDONLY, 0)
if err != nil {
return nil, nil, fmt.Errorf("opening network namespace: %w", err)
}
mynetns := fmt.Sprintf("/proc/%d/fd/%d", unix.Getpid(), netFD)
networks := make(map[string]nettypes.PerNetworkOptions, len(configureNetworks))
for i, network := range configureNetworks {
networks[network] = nettypes.PerNetworkOptions{
InterfaceName: fmt.Sprintf("eth%d", i),
}
}
opts := nettypes.NetworkOptions{
ContainerID: containerName,
ContainerName: containerName,
Networks: networks,
}
netStatus, err := b.NetworkInterface.Setup(mynetns, nettypes.SetupOptions{NetworkOptions: opts})
if err != nil {
return nil, nil, err
}
teardown := func() {
err := b.NetworkInterface.Teardown(mynetns, nettypes.TeardownOptions{NetworkOptions: opts})
if err != nil {
options.Logger.Errorf("failed to cleanup network: %v", err)
}
}
return teardown, netStatusToNetResult(netStatus, hostnames), nil
}
// Create pipes to use for relaying stdio.
func runMakeStdioPipe(uid, gid int) ([][]int, error) {
stdioPipe := make([][]int, 3)
for i := range stdioPipe {
stdioPipe[i] = make([]int, 2)
if err := unix.Pipe(stdioPipe[i]); err != nil {
return nil, fmt.Errorf("creating pipe for container FD %d: %w", i, err)
}
}
if err := unix.Fchown(stdioPipe[unix.Stdin][0], uid, gid); err != nil {
return nil, fmt.Errorf("setting owner of stdin pipe descriptor: %w", err)
}
if err := unix.Fchown(stdioPipe[unix.Stdout][1], uid, gid); err != nil {
return nil, fmt.Errorf("setting owner of stdout pipe descriptor: %w", err)
}
if err := unix.Fchown(stdioPipe[unix.Stderr][1], uid, gid); err != nil {
return nil, fmt.Errorf("setting owner of stderr pipe descriptor: %w", err)
}
return stdioPipe, nil
}
func setupNamespaces(_ *logrus.Logger, g *generate.Generator, namespaceOptions define.NamespaceOptions, idmapOptions define.IDMappingOptions, policy define.NetworkConfigurationPolicy) (configureNetwork bool, networkString string, configureUTS bool, err error) {
defaultContainerConfig, err := config.Default()
if err != nil {
return false, "", false, fmt.Errorf("failed to get container config: %w", err)
}
addSysctl := func(prefixes []string) error {
for _, sysctl := range defaultContainerConfig.Sysctls() {
splitn := strings.SplitN(sysctl, "=", 2)
if len(splitn) > 2 {
return fmt.Errorf("sysctl %q defined in containers.conf must be formatted name=value", sysctl)
}
for _, prefix := range prefixes {
if strings.HasPrefix(splitn[0], prefix) {
g.AddLinuxSysctl(splitn[0], splitn[1])
}
}
}
return nil
}
// Set namespace options in the container configuration.
configureUserns := false
specifiedNetwork := false
for _, namespaceOption := range namespaceOptions {
switch namespaceOption.Name {
case string(specs.IPCNamespace):
if !namespaceOption.Host {
if err := addSysctl([]string{"fs.mqueue"}); err != nil {
return false, "", false, err
}
}
case string(specs.UserNamespace):
configureUserns = false
if !namespaceOption.Host && namespaceOption.Path == "" {
configureUserns = true
}
case string(specs.NetworkNamespace):
specifiedNetwork = true
configureNetwork = false
if !namespaceOption.Host && (namespaceOption.Path == "" || !filepath.IsAbs(namespaceOption.Path)) {
if namespaceOption.Path != "" && !filepath.IsAbs(namespaceOption.Path) {
networkString = namespaceOption.Path
namespaceOption.Path = ""
}
configureNetwork = (policy != define.NetworkDisabled)
}
case string(specs.UTSNamespace):
configureUTS = false
if !namespaceOption.Host {
if namespaceOption.Path == "" {
configureUTS = true
}
if err := addSysctl([]string{"kernel.hostname", "kernel.domainame"}); err != nil {
return false, "", false, err
}
}
}
if namespaceOption.Host {
if err := g.RemoveLinuxNamespace(namespaceOption.Name); err != nil {
return false, "", false, fmt.Errorf("removing %q namespace for run: %w", namespaceOption.Name, err)
}
} else if err := g.AddOrReplaceLinuxNamespace(namespaceOption.Name, namespaceOption.Path); err != nil {
if namespaceOption.Path == "" {
return false, "", false, fmt.Errorf("adding new %q namespace for run: %w", namespaceOption.Name, err)
}
return false, "", false, fmt.Errorf("adding %q namespace %q for run: %w", namespaceOption.Name, namespaceOption.Path, err)
}
}
// If we've got mappings, we're going to have to create a user namespace.
if len(idmapOptions.UIDMap) > 0 || len(idmapOptions.GIDMap) > 0 || configureUserns {
if err := g.AddOrReplaceLinuxNamespace(string(specs.UserNamespace), ""); err != nil {
return false, "", false, fmt.Errorf("adding new %q namespace for run: %w", string(specs.UserNamespace), err)
}
hostUidmap, hostGidmap, err := unshare.GetHostIDMappings("")
if err != nil {
return false, "", false, err
}
for _, m := range idmapOptions.UIDMap {
g.AddLinuxUIDMapping(m.HostID, m.ContainerID, m.Size)
}
if len(idmapOptions.UIDMap) == 0 {
for _, m := range hostUidmap {
g.AddLinuxUIDMapping(m.ContainerID, m.ContainerID, m.Size)
}
}
for _, m := range idmapOptions.GIDMap {
g.AddLinuxGIDMapping(m.HostID, m.ContainerID, m.Size)
}
if len(idmapOptions.GIDMap) == 0 {
for _, m := range hostGidmap {
g.AddLinuxGIDMapping(m.ContainerID, m.ContainerID, m.Size)
}
}
if !specifiedNetwork {
if err := g.AddOrReplaceLinuxNamespace(string(specs.NetworkNamespace), ""); err != nil {
return false, "", false, fmt.Errorf("adding new %q namespace for run: %w", string(specs.NetworkNamespace), err)
}
configureNetwork = (policy != define.NetworkDisabled)
}
} else {
if err := g.RemoveLinuxNamespace(string(specs.UserNamespace)); err != nil {
return false, "", false, fmt.Errorf("removing %q namespace for run: %w", string(specs.UserNamespace), err)
}
if !specifiedNetwork {
if err := g.RemoveLinuxNamespace(string(specs.NetworkNamespace)); err != nil {
return false, "", false, fmt.Errorf("removing %q namespace for run: %w", string(specs.NetworkNamespace), err)
}
}
}
if configureNetwork {
if err := addSysctl([]string{"net"}); err != nil {
return false, "", false, err
}
}
return configureNetwork, networkString, configureUTS, nil
}
func (b *Builder) configureNamespaces(g *generate.Generator, options *RunOptions) (bool, string, error) {
defaultNamespaceOptions, err := DefaultNamespaceOptions()
if err != nil {
return false, "", err
}
namespaceOptions := defaultNamespaceOptions
namespaceOptions.AddOrReplace(b.NamespaceOptions...)
namespaceOptions.AddOrReplace(options.NamespaceOptions...)
networkPolicy := options.ConfigureNetwork
// Nothing was specified explicitly so network policy should be inherited from builder
if networkPolicy == NetworkDefault {
networkPolicy = b.ConfigureNetwork
// If builder policy was NetworkDisabled and
// we want to disable network for this run.
// reset options.ConfigureNetwork to NetworkDisabled
// since it will be treated as source of truth later.
if networkPolicy == NetworkDisabled {
options.ConfigureNetwork = networkPolicy
}
}
if networkPolicy == NetworkDisabled {
namespaceOptions.AddOrReplace(define.NamespaceOptions{{Name: string(specs.NetworkNamespace), Host: false}}...)
}
configureNetwork, networkString, configureUTS, err := setupNamespaces(options.Logger, g, namespaceOptions, b.IDMappingOptions, networkPolicy)
if err != nil {
return false, "", err
}
if configureUTS {
if options.Hostname != "" {
g.SetHostname(options.Hostname)
} else if b.Hostname() != "" {
g.SetHostname(b.Hostname())
} else {
hostname := stringid.TruncateID(b.ContainerID)
defConfig, err := config.Default()
if err != nil {
return false, "", fmt.Errorf("failed to get container config: %w", err)
}
if defConfig.Containers.ContainerNameAsHostName {
if mapped := mapContainerNameToHostname(b.Container); mapped != "" {
hostname = mapped
}
}
g.SetHostname(hostname)
}
} else {
g.SetHostname("")
}
found := false
spec := g.Config
for i := range spec.Process.Env {
if strings.HasPrefix(spec.Process.Env[i], "HOSTNAME=") {
found = true
break
}
}
if !found {
spec.Process.Env = append(spec.Process.Env, fmt.Sprintf("HOSTNAME=%s", spec.Hostname))
}
return configureNetwork, networkString, nil
}
func runSetupBoundFiles(bundlePath string, bindFiles map[string]string) (mounts []specs.Mount) {
for dest, src := range bindFiles {
options := []string{"rbind"}
if strings.HasPrefix(src, bundlePath) {
options = append(options, bind.NoBindOption)
}
mounts = append(mounts, specs.Mount{
Source: src,
Destination: dest,
Type: "bind",
Options: options,
})
}
return mounts
}
func addRlimits(ulimit []string, g *generate.Generator, defaultUlimits []string) error {
var (
ul *units.Ulimit
err error
// setup rlimits
nofileSet bool
nprocSet bool
)
ulimit = append(defaultUlimits, ulimit...)
for _, u := range ulimit {
if ul, err = butil.ParseUlimit(u); err != nil {
return fmt.Errorf("ulimit option %q requires name=SOFT:HARD, failed to be parsed: %w", u, err)
}
if strings.ToUpper(ul.Name) == "NOFILE" {
nofileSet = true
}
if strings.ToUpper(ul.Name) == "NPROC" {
nprocSet = true
}
g.AddProcessRlimits("RLIMIT_"+strings.ToUpper(ul.Name), uint64(ul.Hard), uint64(ul.Soft))
}
if !nofileSet {
lim := define.RLimitDefaultValue
var rlimit unix.Rlimit
if err := unix.Getrlimit(unix.RLIMIT_NOFILE, &rlimit); err == nil {
if lim < rlimit.Max || unshare.IsRootless() {
lim = rlimit.Max
}
} else {
logrus.Warnf("Failed to return RLIMIT_NOFILE ulimit %q", err)
}
g.AddProcessRlimits("RLIMIT_NOFILE", lim, lim)
}
if !nprocSet {
lim := define.RLimitDefaultValue
var rlimit unix.Rlimit
if err := unix.Getrlimit(unix.RLIMIT_NPROC, &rlimit); err == nil {
if lim < rlimit.Max || unshare.IsRootless() {
lim = rlimit.Max
}
} else {
logrus.Warnf("Failed to return RLIMIT_NPROC ulimit %q", err)
}
g.AddProcessRlimits("RLIMIT_NPROC", lim, lim)
}
return nil
}
func (b *Builder) runSetupVolumeMounts(mountLabel string, volumeMounts []string, optionMounts []specs.Mount, idMaps IDMaps) (mounts []specs.Mount, overlayDirs []string, Err error) {
// Make sure the overlay directory is clean before running
containerDir, err := b.store.ContainerDirectory(b.ContainerID)
if err != nil {
return nil, nil, fmt.Errorf("looking up container directory for %s: %w", b.ContainerID, err)
}
if err := overlay.CleanupContent(containerDir); err != nil {
return nil, nil, fmt.Errorf("cleaning up overlay content for %s: %w", b.ContainerID, err)
}
parseMount := func(mountType, host, container string, options []string) (specs.Mount, error) {
var foundrw, foundro, foundz, foundZ, foundO, foundU bool
var rootProp, upperDir, workDir string
for _, opt := range options {
switch opt {
case "rw":
foundrw = true
case "ro":
foundro = true
case "z":
foundz = true
case "Z":
foundZ = true
case "O":
foundO = true
case "U":
foundU = true
case "private", "rprivate", "slave", "rslave", "shared", "rshared":
rootProp = opt
}
if strings.HasPrefix(opt, "upperdir") {
splitOpt := strings.SplitN(opt, "=", 2)
if len(splitOpt) > 1 {
upperDir = splitOpt[1]
}
}
if strings.HasPrefix(opt, "workdir") {
splitOpt := strings.SplitN(opt, "=", 2)
if len(splitOpt) > 1 {
workDir = splitOpt[1]
}
}
}
if !foundrw && !foundro {
options = append(options, "rw")
}
if foundz {
if err := relabel(host, mountLabel, true); err != nil {
return specs.Mount{}, err
}
options = slices.DeleteFunc(options, func(o string) bool { return o == "z" })
}
if foundZ {
if err := relabel(host, mountLabel, false); err != nil {
return specs.Mount{}, err
}
options = slices.DeleteFunc(options, func(o string) bool { return o == "Z" })
}
if foundU {
if err := chown.ChangeHostPathOwnership(host, true, idMaps.processUID, idMaps.processGID); err != nil {
return specs.Mount{}, err
}
options = slices.DeleteFunc(options, func(o string) bool { return o == "U" })
}
if foundO {
if (upperDir != "" && workDir == "") || (workDir != "" && upperDir == "") {
return specs.Mount{}, errors.New("if specifying upperdir then workdir must be specified or vice versa")
}
containerDir, err := b.store.ContainerDirectory(b.ContainerID)
if err != nil {
return specs.Mount{}, err
}
contentDir, err := overlay.TempDir(containerDir, idMaps.rootUID, idMaps.rootGID)
if err != nil {
return specs.Mount{}, fmt.Errorf("failed to create TempDir in the %s directory: %w", containerDir, err)
}
overlayOpts := overlay.Options{
RootUID: idMaps.rootUID,
RootGID: idMaps.rootGID,
UpperDirOptionFragment: upperDir,
WorkDirOptionFragment: workDir,
GraphOpts: slices.Clone(b.store.GraphOptions()),
}
overlayMount, err := overlay.MountWithOptions(contentDir, host, container, &overlayOpts)
if err == nil {
overlayDirs = append(overlayDirs, contentDir)
}
// If chown true, add correct ownership to the overlay temp directories.
if err == nil && foundU {
if err := chown.ChangeHostPathOwnership(contentDir, true, idMaps.processUID, idMaps.processGID); err != nil {
return specs.Mount{}, err
}
}
return overlayMount, err
}
if rootProp == "" {
options = append(options, "private")
}
if mountType != "tmpfs" {
mountType = "bind"
options = append(options, "rbind")
}
return specs.Mount{
Destination: container,
Type: mountType,
Source: host,
Options: options,
}, nil
}
// Bind mount volumes specified for this particular Run() invocation
for _, i := range optionMounts {
logrus.Debugf("setting up mounted volume at %q", i.Destination)
mount, err := parseMount(i.Type, i.Source, i.Destination, i.Options)
if err != nil {
return nil, nil, err
}
mounts = append(mounts, mount)
}
// Bind mount volumes given by the user when the container was created
for _, i := range volumeMounts {
var options []string
spliti := parse.SplitStringWithColonEscape(i)
if len(spliti) > 2 {
options = strings.Split(spliti[2], ",")
}
options = append(options, "rbind")
mount, err := parseMount("bind", spliti[0], spliti[1], options)
if err != nil {
return nil, nil, err
}
mounts = append(mounts, mount)
}
return mounts, overlayDirs, nil
}
func setupMaskedPaths(g *generate.Generator, opts *define.CommonBuildOptions) {
if slices.Contains(opts.Unmasks, "all") {
return
}
nextMaskedPath:
for _, mp := range append(config.DefaultMaskedPaths(), opts.Masks...) {
for _, unmask := range opts.Unmasks {
match, err := filepath.Match(unmask, mp)
if err != nil {
logrus.Warnf("Invalid unmask pattern %q: %v", unmask, err)
continue
}
if match {
continue nextMaskedPath
}
}
g.AddLinuxMaskedPaths(mp)
}
}
func setupReadOnlyPaths(g *generate.Generator) {
for _, rp := range config.DefaultReadOnlyPaths {
g.AddLinuxReadonlyPaths(rp)
}
}
func setupCapAdd(g *generate.Generator, caps ...string) error {
for _, cap := range caps {
if err := g.AddProcessCapabilityBounding(cap); err != nil {
return fmt.Errorf("adding %q to the bounding capability set: %w", cap, err)
}
if err := g.AddProcessCapabilityEffective(cap); err != nil {
return fmt.Errorf("adding %q to the effective capability set: %w", cap, err)
}
if err := g.AddProcessCapabilityPermitted(cap); err != nil {
return fmt.Errorf("adding %q to the permitted capability set: %w", cap, err)
}
}
return nil
}
func setupCapDrop(g *generate.Generator, caps ...string) error {
for _, cap := range caps {
if err := g.DropProcessCapabilityBounding(cap); err != nil {
return fmt.Errorf("removing %q from the bounding capability set: %w", cap, err)
}
if err := g.DropProcessCapabilityEffective(cap); err != nil {
return fmt.Errorf("removing %q from the effective capability set: %w", cap, err)
}
if err := g.DropProcessCapabilityPermitted(cap); err != nil {
return fmt.Errorf("removing %q from the permitted capability set: %w", cap, err)
}
}
return nil
}
func setupCapabilities(g *generate.Generator, defaultCapabilities, adds, drops []string) error {
g.ClearProcessCapabilities()
if err := setupCapAdd(g, defaultCapabilities...); err != nil {
return err
}
for _, c := range adds {
if strings.ToLower(c) == "all" {
adds = capabilities.AllCapabilities()
break
}
}
for _, c := range drops {
if strings.ToLower(c) == "all" {
g.ClearProcessCapabilities()
return nil
}
}
if err := setupCapAdd(g, adds...); err != nil {
return err
}
return setupCapDrop(g, drops...)
}
func addOrReplaceMount(mounts []specs.Mount, mount specs.Mount) []specs.Mount {
for i := range mounts {
if mounts[i].Destination == mount.Destination {
mounts[i] = mount
return mounts
}
}
return append(mounts, mount)
}
// setupSpecialMountSpecChanges creates special mounts for depending on the namespaces
// logic taken from podman and adapted for buildah
// https://github.com/containers/podman/blob/4ba71f955a944790edda6e007e6d074009d437a7/pkg/specgen/generate/oci.go#L178
func setupSpecialMountSpecChanges(spec *specs.Spec, shmSize string) ([]specs.Mount, error) {
mounts := spec.Mounts
isRootless := unshare.IsRootless()
isNewUserns := false
isNetns := false
isPidns := false
isIpcns := false
for _, namespace := range spec.Linux.Namespaces {
switch namespace.Type {
case specs.NetworkNamespace:
isNetns = true
case specs.UserNamespace:
isNewUserns = true
case specs.PIDNamespace:
isPidns = true
case specs.IPCNamespace:
isIpcns = true
}
}
addCgroup := true
// mount sys when root and no userns or when a new netns is created
canMountSys := (!isRootless && !isNewUserns) || isNetns
if !canMountSys {
addCgroup = false
sys := "/sys"
sysMnt := specs.Mount{
Destination: sys,
Type: "bind",
Source: sys,
Options: []string{bind.NoBindOption, "rprivate", "nosuid", "noexec", "nodev", "ro", "rbind"},
}
mounts = addOrReplaceMount(mounts, sysMnt)
}
gid5Available := true
if isRootless {
_, gids, err := unshare.GetHostIDMappings("")
if err != nil {
return nil, err
}
gid5Available = checkIDsGreaterThan5(gids)
}
if gid5Available && len(spec.Linux.GIDMappings) > 0 {
gid5Available = checkIDsGreaterThan5(spec.Linux.GIDMappings)
}
if !gid5Available {
// If we have no GID mappings, the gid=5 default option would fail, so drop it.
devPts := specs.Mount{
Destination: "/dev/pts",
Type: "devpts",
Source: "devpts",
Options: []string{"rprivate", "nosuid", "noexec", "newinstance", "ptmxmode=0666", "mode=0620"},
}
mounts = addOrReplaceMount(mounts, devPts)
}
isUserns := isNewUserns || isRootless
if isUserns && !isIpcns {
devMqueue := "/dev/mqueue"
devMqueueMnt := specs.Mount{
Destination: devMqueue,
Type: "bind",
Source: devMqueue,
Options: []string{bind.NoBindOption, "bind", "nosuid", "noexec", "nodev"},
}
mounts = addOrReplaceMount(mounts, devMqueueMnt)
}
if isUserns && !isPidns {
proc := "/proc"
procMount := specs.Mount{
Destination: proc,
Type: "bind",
Source: proc,
Options: []string{bind.NoBindOption, "rbind", "nosuid", "noexec", "nodev"},
}
mounts = addOrReplaceMount(mounts, procMount)
}
if addCgroup {
cgroupMnt := specs.Mount{
Destination: "/sys/fs/cgroup",
Type: "cgroup",
Source: "cgroup",
Options: []string{"rprivate", "nosuid", "noexec", "nodev", "relatime", "rw"},
}
mounts = addOrReplaceMount(mounts, cgroupMnt)
}
// if userns and host ipc bind mount shm
if isUserns && !isIpcns {
// bind mount /dev/shm when it exists
if err := fileutils.Exists("/dev/shm"); err == nil {
shmMount := specs.Mount{
Source: "/dev/shm",
Type: "bind",
Destination: "/dev/shm",
Options: []string{bind.NoBindOption, "rbind", "nosuid", "noexec", "nodev"},
}
mounts = addOrReplaceMount(mounts, shmMount)
}
} else if shmSize != "" {
shmMount := specs.Mount{
Source: "shm",
Destination: "/dev/shm",
Type: "tmpfs",
Options: []string{"private", "nodev", "noexec", "nosuid", "mode=1777", "size=" + shmSize},
}
mounts = addOrReplaceMount(mounts, shmMount)
}
return mounts, nil
}
func checkIDsGreaterThan5(ids []specs.LinuxIDMapping) bool {
for _, r := range ids {
if r.ContainerID <= 5 && 5 < r.ContainerID+r.Size {
return true
}
}
return false
}
// Returns a Mount to add to the runtime spec's list of mounts, the ID of an
// image, the path to a mounted filesystem, and the path to an overlay
// filesystem, and an optional lock, or an error.
//
// The caller is expected to, after the command which uses the mount exits,
// clean up the overlay filesystem (if we returned one), unmount the mounted
// filesystem (if we provided the path to its mountpoint) and remove its
// mountpoint, unmount the image (if we mounted one), and release the lock (if
// we took one).
func (b *Builder) getCacheMount(tokens []string, sys *types.SystemContext, stageMountPoints map[string]internal.StageMountDetails, idMaps IDMaps, workDir, tmpDir string) (*specs.Mount, string, string, string, *lockfile.LockFile, error) {
var optionMounts []specs.Mount
optionMount, mountedImage, intermediateMount, overlayMount, targetLock, err := volumes.GetCacheMount(sys, tokens, b.store, b.MountLabel, stageMountPoints, idMaps.uidmap, idMaps.gidmap, workDir, tmpDir)
if err != nil {
return nil, "", "", "", nil, err
}
succeeded := false
defer func() {
if !succeeded {
if overlayMount != "" {
if err := overlay.RemoveTemp(overlayMount); err != nil {
b.Logger.Debug(err.Error())
}
}
if intermediateMount != "" {
if err := mount.Unmount(intermediateMount); err != nil {
b.Logger.Debugf("unmounting %q: %v", intermediateMount, err)
}
if err := os.Remove(intermediateMount); err != nil {
b.Logger.Debugf("removing should-be-empty directory %q: %v", intermediateMount, err)
}
}
if mountedImage != "" {
if _, err := b.store.UnmountImage(mountedImage, false); err != nil {
b.Logger.Debugf("unmounting image %q: %v", mountedImage, err)
}
}
if targetLock != nil {
targetLock.Unlock()
}
}
}()
optionMounts = append(optionMounts, optionMount)
volumes, overlayDirs, err := b.runSetupVolumeMounts(b.MountLabel, nil, optionMounts, idMaps)
if err != nil {
return nil, "", "", "", nil, err
}
if len(overlayDirs) != 0 {
return nil, "", "", "", nil, errors.New("internal error: did not expect a resolved cache mount to use the O flag")
}
succeeded = true
return &volumes[0], mountedImage, intermediateMount, overlayMount, targetLock, nil
}
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