summaryrefslogtreecommitdiff
path: root/pkg/domain/infra/runtime_libpod.go
blob: 5cbee2e7670875b479335d7ea8cd32e3fd982606 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
// +build !remote

package infra

import (
	"context"
	"fmt"
	"os"
	"os/signal"
	"sync"

	"github.com/containers/podman/v3/cmd/podman/utils"
	"github.com/containers/podman/v3/libpod"
	"github.com/containers/podman/v3/pkg/cgroups"
	"github.com/containers/podman/v3/pkg/domain/entities"
	"github.com/containers/podman/v3/pkg/namespaces"
	"github.com/containers/podman/v3/pkg/rootless"
	"github.com/containers/storage/pkg/idtools"
	"github.com/containers/storage/types"
	"github.com/pkg/errors"
	"github.com/sirupsen/logrus"
	flag "github.com/spf13/pflag"
)

var (
	// runtimeSync only guards the non-specialized runtime
	runtimeSync sync.Once
	// The default GetRuntime() always returns the same object and error
	runtimeLib *libpod.Runtime
	runtimeErr error
)

type engineOpts struct {
	name     string
	renumber bool
	migrate  bool
	noStore  bool
	withFDS  bool
	config   *entities.PodmanConfig
}

// GetRuntimeMigrate gets a libpod runtime that will perform a migration of existing containers
func GetRuntimeMigrate(ctx context.Context, fs *flag.FlagSet, cfg *entities.PodmanConfig, newRuntime string) (*libpod.Runtime, error) {
	return getRuntime(ctx, fs, &engineOpts{
		name:     newRuntime,
		renumber: false,
		migrate:  true,
		noStore:  false,
		withFDS:  true,
		config:   cfg,
	})
}

// GetRuntimeDisableFDs gets a libpod runtime that will disable sd notify
func GetRuntimeDisableFDs(ctx context.Context, fs *flag.FlagSet, cfg *entities.PodmanConfig) (*libpod.Runtime, error) {
	return getRuntime(ctx, fs, &engineOpts{
		renumber: false,
		migrate:  false,
		noStore:  false,
		withFDS:  false,
		config:   cfg,
	})
}

// GetRuntimeRenumber gets a libpod runtime that will perform a lock renumber
func GetRuntimeRenumber(ctx context.Context, fs *flag.FlagSet, cfg *entities.PodmanConfig) (*libpod.Runtime, error) {
	return getRuntime(ctx, fs, &engineOpts{
		renumber: true,
		migrate:  false,
		noStore:  false,
		withFDS:  true,
		config:   cfg,
	})
}

// GetRuntime generates a new libpod runtime configured by command line options
func GetRuntime(ctx context.Context, flags *flag.FlagSet, cfg *entities.PodmanConfig) (*libpod.Runtime, error) {
	runtimeSync.Do(func() {
		runtimeLib, runtimeErr = getRuntime(ctx, flags, &engineOpts{
			renumber: false,
			migrate:  false,
			noStore:  false,
			withFDS:  true,
			config:   cfg,
		})
	})
	return runtimeLib, runtimeErr
}

// GetRuntimeNoStore generates a new libpod runtime configured by command line options
func GetRuntimeNoStore(ctx context.Context, fs *flag.FlagSet, cfg *entities.PodmanConfig) (*libpod.Runtime, error) {
	return getRuntime(ctx, fs, &engineOpts{
		renumber: false,
		migrate:  false,
		noStore:  true,
		withFDS:  true,
		config:   cfg,
	})
}

func getRuntime(ctx context.Context, fs *flag.FlagSet, opts *engineOpts) (*libpod.Runtime, error) {
	options := []libpod.RuntimeOption{}
	storageOpts := types.StoreOptions{}
	cfg := opts.config

	storageSet := false

	uidmapFlag := fs.Lookup("uidmap")
	gidmapFlag := fs.Lookup("gidmap")
	subuidname := fs.Lookup("subuidname")
	subgidname := fs.Lookup("subgidname")
	if (uidmapFlag != nil && gidmapFlag != nil && subuidname != nil && subgidname != nil) &&
		(uidmapFlag.Changed || gidmapFlag.Changed || subuidname.Changed || subgidname.Changed) {
		userns, _ := fs.GetString("userns")
		uidmapVal, _ := fs.GetStringSlice("uidmap")
		gidmapVal, _ := fs.GetStringSlice("gidmap")
		subuidVal, _ := fs.GetString("subuidname")
		subgidVal, _ := fs.GetString("subgidname")
		mappings, err := ParseIDMapping(namespaces.UsernsMode(userns), uidmapVal, gidmapVal, subuidVal, subgidVal)
		if err != nil {
			return nil, err
		}
		storageOpts.UIDMap = mappings.UIDMap
		storageOpts.GIDMap = mappings.GIDMap

		storageSet = true
	}

	if fs.Changed("root") {
		storageSet = true
		storageOpts.GraphRoot = cfg.Engine.StaticDir
		storageOpts.GraphDriverOptions = []string{}
	}
	if fs.Changed("runroot") {
		storageSet = true
		storageOpts.RunRoot = cfg.Runroot
	}
	if len(storageOpts.RunRoot) > 50 {
		return nil, errors.New("the specified runroot is longer than 50 characters")
	}
	if fs.Changed("storage-driver") {
		storageSet = true
		storageOpts.GraphDriverName = cfg.StorageDriver
		// Overriding the default storage driver caused GraphDriverOptions from storage.conf to be ignored
		storageOpts.GraphDriverOptions = []string{}
	}
	// This should always be checked after storage-driver is checked
	if len(cfg.StorageOpts) > 0 {
		storageSet = true
		if len(cfg.StorageOpts) == 1 && cfg.StorageOpts[0] == "" {
			storageOpts.GraphDriverOptions = []string{}
		} else {
			storageOpts.GraphDriverOptions = cfg.StorageOpts
		}
	}
	if opts.migrate {
		options = append(options, libpod.WithMigrate())
		if opts.name != "" {
			options = append(options, libpod.WithMigrateRuntime(opts.name))
		}
	}

	if opts.renumber {
		options = append(options, libpod.WithRenumber())
	}

	if len(cfg.RuntimeFlags) > 0 {
		runtimeFlags := []string{}
		for _, arg := range cfg.RuntimeFlags {
			runtimeFlags = append(runtimeFlags, "--"+arg)
		}
		options = append(options, libpod.WithRuntimeFlags(runtimeFlags))
	}

	// Only set this if the user changes storage config on the command line
	if storageSet {
		options = append(options, libpod.WithStorageConfig(storageOpts))
	}

	if !storageSet && opts.noStore {
		options = append(options, libpod.WithNoStore())
	}
	// TODO CLI flags for image config?
	// TODO CLI flag for signature policy?

	if len(cfg.Engine.Namespace) > 0 {
		options = append(options, libpod.WithNamespace(cfg.Engine.Namespace))
	}

	if fs.Changed("runtime") {
		options = append(options, libpod.WithOCIRuntime(cfg.RuntimePath))
	}

	if fs.Changed("conmon") {
		options = append(options, libpod.WithConmonPath(cfg.ConmonPath))
	}
	if fs.Changed("tmpdir") {
		options = append(options, libpod.WithTmpDir(cfg.Engine.TmpDir))
	}
	if fs.Changed("network-cmd-path") {
		options = append(options, libpod.WithNetworkCmdPath(cfg.Engine.NetworkCmdPath))
	}

	if fs.Changed("events-backend") {
		options = append(options, libpod.WithEventsLogger(cfg.Engine.EventsLogger))
	}

	if fs.Changed("cgroup-manager") {
		options = append(options, libpod.WithCgroupManager(cfg.Engine.CgroupManager))
	} else {
		unified, err := cgroups.IsCgroup2UnifiedMode()
		if err != nil {
			return nil, err
		}
		if rootless.IsRootless() && !unified {
			options = append(options, libpod.WithCgroupManager("cgroupfs"))
		}
	}

	// TODO flag to set libpod static dir?
	// TODO flag to set libpod tmp dir?

	if fs.Changed("cni-config-dir") {
		options = append(options, libpod.WithCNIConfigDir(cfg.Network.NetworkConfigDir))
	}
	if fs.Changed("default-mounts-file") {
		options = append(options, libpod.WithDefaultMountsFile(cfg.Containers.DefaultMountsFile))
	}
	if fs.Changed("hooks-dir") {
		options = append(options, libpod.WithHooksDir(cfg.Engine.HooksDir...))
	}
	if fs.Changed("registries-conf") {
		options = append(options, libpod.WithRegistriesConf(cfg.RegistriesConf))
	}

	// TODO flag to set CNI plugins dir?

	if !opts.withFDS {
		options = append(options, libpod.WithEnableSDNotify())
	}
	return libpod.NewRuntime(ctx, options...)
}

// ParseIDMapping takes idmappings and subuid and subgid maps and returns a storage mapping
func ParseIDMapping(mode namespaces.UsernsMode, uidMapSlice, gidMapSlice []string, subUIDMap, subGIDMap string) (*types.IDMappingOptions, error) {
	options := types.IDMappingOptions{
		HostUIDMapping: true,
		HostGIDMapping: true,
	}

	if mode.IsAuto() {
		var err error
		options.HostUIDMapping = false
		options.HostGIDMapping = false
		options.AutoUserNs = true
		opts, err := mode.GetAutoOptions()
		if err != nil {
			return nil, err
		}
		options.AutoUserNsOpts = *opts
		return &options, nil
	}
	if mode.IsKeepID() {
		if len(uidMapSlice) > 0 || len(gidMapSlice) > 0 {
			return nil, errors.New("cannot specify custom mappings with --userns=keep-id")
		}
		if len(subUIDMap) > 0 || len(subGIDMap) > 0 {
			return nil, errors.New("cannot specify subuidmap or subgidmap with --userns=keep-id")
		}
		if rootless.IsRootless() {
			min := func(a, b int) int {
				if a < b {
					return a
				}
				return b
			}

			uid := rootless.GetRootlessUID()
			gid := rootless.GetRootlessGID()

			uids, gids, err := rootless.GetConfiguredMappings()
			if err != nil {
				return nil, errors.Wrapf(err, "cannot read mappings")
			}
			maxUID, maxGID := 0, 0
			for _, u := range uids {
				maxUID += u.Size
			}
			for _, g := range gids {
				maxGID += g.Size
			}

			options.UIDMap, options.GIDMap = nil, nil

			options.UIDMap = append(options.UIDMap, idtools.IDMap{ContainerID: 0, HostID: 1, Size: min(uid, maxUID)})
			options.UIDMap = append(options.UIDMap, idtools.IDMap{ContainerID: uid, HostID: 0, Size: 1})
			if maxUID > uid {
				options.UIDMap = append(options.UIDMap, idtools.IDMap{ContainerID: uid + 1, HostID: uid + 1, Size: maxUID - uid})
			}

			options.GIDMap = append(options.GIDMap, idtools.IDMap{ContainerID: 0, HostID: 1, Size: min(gid, maxGID)})
			options.GIDMap = append(options.GIDMap, idtools.IDMap{ContainerID: gid, HostID: 0, Size: 1})
			if maxGID > gid {
				options.GIDMap = append(options.GIDMap, idtools.IDMap{ContainerID: gid + 1, HostID: gid + 1, Size: maxGID - gid})
			}

			options.HostUIDMapping = false
			options.HostGIDMapping = false
		}
		// Simply ignore the setting and do not setup an inner namespace for root as it is a no-op
		return &options, nil
	}

	if subGIDMap == "" && subUIDMap != "" {
		subGIDMap = subUIDMap
	}
	if subUIDMap == "" && subGIDMap != "" {
		subUIDMap = subGIDMap
	}
	if len(gidMapSlice) == 0 && len(uidMapSlice) != 0 {
		gidMapSlice = uidMapSlice
	}
	if len(uidMapSlice) == 0 && len(gidMapSlice) != 0 {
		uidMapSlice = gidMapSlice
	}
	if len(uidMapSlice) == 0 && subUIDMap == "" && os.Getuid() != 0 {
		uidMapSlice = []string{fmt.Sprintf("0:%d:1", os.Getuid())}
	}
	if len(gidMapSlice) == 0 && subGIDMap == "" && os.Getuid() != 0 {
		gidMapSlice = []string{fmt.Sprintf("0:%d:1", os.Getgid())}
	}

	if subUIDMap != "" && subGIDMap != "" {
		mappings, err := idtools.NewIDMappings(subUIDMap, subGIDMap)
		if err != nil {
			return nil, err
		}
		options.UIDMap = mappings.UIDs()
		options.GIDMap = mappings.GIDs()
	}
	parsedUIDMap, err := idtools.ParseIDMap(uidMapSlice, "UID")
	if err != nil {
		return nil, err
	}
	parsedGIDMap, err := idtools.ParseIDMap(gidMapSlice, "GID")
	if err != nil {
		return nil, err
	}
	options.UIDMap = append(options.UIDMap, parsedUIDMap...)
	options.GIDMap = append(options.GIDMap, parsedGIDMap...)
	if len(options.UIDMap) > 0 {
		options.HostUIDMapping = false
	}
	if len(options.GIDMap) > 0 {
		options.HostGIDMapping = false
	}
	return &options, nil
}

// StartWatcher starts a new SIGHUP go routine for the current config.
func StartWatcher(rt *libpod.Runtime) {
	// Setup the signal notifier
	ch := make(chan os.Signal, 1)
	signal.Notify(ch, utils.SIGHUP)

	go func() {
		for {
			// Block until the signal is received
			logrus.Debugf("waiting for SIGHUP to reload configuration")
			<-ch
			if err := rt.Reload(); err != nil {
				logrus.Errorf("unable to reload configuration: %v", err)
				continue
			}
		}
	}()

	logrus.Debugf("registered SIGHUP watcher for config")
}