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
|
package buildah
import (
"archive/tar"
"bufio"
"io"
"os"
"strconv"
"strings"
"sync"
"github.com/containers/image/docker/reference"
"github.com/containers/image/pkg/sysregistries"
"github.com/containers/image/types"
"github.com/containers/storage/pkg/archive"
"github.com/containers/storage/pkg/chrootarchive"
"github.com/containers/storage/pkg/idtools"
"github.com/containers/storage/pkg/reexec"
rspec "github.com/opencontainers/runtime-spec/specs-go"
"github.com/pkg/errors"
)
// InitReexec is a wrapper for reexec.Init(). It should be called at
// the start of main(), and if it returns true, main() should return
// immediately.
func InitReexec() bool {
return reexec.Init()
}
func copyStringStringMap(m map[string]string) map[string]string {
n := map[string]string{}
for k, v := range m {
n[k] = v
}
return n
}
func copyStringSlice(s []string) []string {
t := make([]string, len(s))
copy(t, s)
return t
}
func stringInSlice(s string, slice []string) bool {
for _, v := range slice {
if v == s {
return true
}
}
return false
}
func convertStorageIDMaps(UIDMap, GIDMap []idtools.IDMap) ([]rspec.LinuxIDMapping, []rspec.LinuxIDMapping) {
uidmap := make([]rspec.LinuxIDMapping, 0, len(UIDMap))
gidmap := make([]rspec.LinuxIDMapping, 0, len(GIDMap))
for _, m := range UIDMap {
uidmap = append(uidmap, rspec.LinuxIDMapping{
HostID: uint32(m.HostID),
ContainerID: uint32(m.ContainerID),
Size: uint32(m.Size),
})
}
for _, m := range GIDMap {
gidmap = append(gidmap, rspec.LinuxIDMapping{
HostID: uint32(m.HostID),
ContainerID: uint32(m.ContainerID),
Size: uint32(m.Size),
})
}
return uidmap, gidmap
}
func convertRuntimeIDMaps(UIDMap, GIDMap []rspec.LinuxIDMapping) ([]idtools.IDMap, []idtools.IDMap) {
uidmap := make([]idtools.IDMap, 0, len(UIDMap))
gidmap := make([]idtools.IDMap, 0, len(GIDMap))
for _, m := range UIDMap {
uidmap = append(uidmap, idtools.IDMap{
HostID: int(m.HostID),
ContainerID: int(m.ContainerID),
Size: int(m.Size),
})
}
for _, m := range GIDMap {
gidmap = append(gidmap, idtools.IDMap{
HostID: int(m.HostID),
ContainerID: int(m.ContainerID),
Size: int(m.Size),
})
}
return uidmap, gidmap
}
// copyFileWithTar returns a function which copies a single file from outside
// of any container into our working container, mapping permissions using the
// container's ID maps, possibly overridden using the passed-in chownOpts
func (b *Builder) copyFileWithTar(chownOpts *idtools.IDPair, hasher io.Writer) func(src, dest string) error {
convertedUIDMap, convertedGIDMap := convertRuntimeIDMaps(b.IDMappingOptions.UIDMap, b.IDMappingOptions.GIDMap)
untarMappings := idtools.NewIDMappingsFromMaps(convertedUIDMap, convertedGIDMap)
archiver := chrootarchive.NewArchiverWithChown(nil, chownOpts, untarMappings)
if hasher != nil {
originalUntar := archiver.Untar
archiver.Untar = func(tarArchive io.Reader, dest string, options *archive.TarOptions) error {
contentReader, contentWriter, err := os.Pipe()
if err != nil {
return err
}
defer contentReader.Close()
defer contentWriter.Close()
var hashError error
var hashWorker sync.WaitGroup
hashWorker.Add(1)
go func() {
t := tar.NewReader(contentReader)
_, err := t.Next()
if err != nil {
hashError = err
}
if _, err = io.Copy(hasher, t); err != nil && err != io.EOF {
hashError = err
}
hashWorker.Done()
}()
err = originalUntar(io.TeeReader(tarArchive, contentWriter), dest, options)
hashWorker.Wait()
if err == nil {
err = hashError
}
return err
}
}
return archiver.CopyFileWithTar
}
// copyWithTar returns a function which copies a directory tree from outside of
// any container into our working container, mapping permissions using the
// container's ID maps, possibly overridden using the passed-in chownOpts
func (b *Builder) copyWithTar(chownOpts *idtools.IDPair, hasher io.Writer) func(src, dest string) error {
convertedUIDMap, convertedGIDMap := convertRuntimeIDMaps(b.IDMappingOptions.UIDMap, b.IDMappingOptions.GIDMap)
untarMappings := idtools.NewIDMappingsFromMaps(convertedUIDMap, convertedGIDMap)
archiver := chrootarchive.NewArchiverWithChown(nil, chownOpts, untarMappings)
if hasher != nil {
originalUntar := archiver.Untar
archiver.Untar = func(tarArchive io.Reader, dest string, options *archive.TarOptions) error {
return originalUntar(io.TeeReader(tarArchive, hasher), dest, options)
}
}
return archiver.CopyWithTar
}
// untarPath returns a function which extracts an archive in a specified
// location into our working container, mapping permissions using the
// container's ID maps, possibly overridden using the passed-in chownOpts
func (b *Builder) untarPath(chownOpts *idtools.IDPair, hasher io.Writer) func(src, dest string) error {
convertedUIDMap, convertedGIDMap := convertRuntimeIDMaps(b.IDMappingOptions.UIDMap, b.IDMappingOptions.GIDMap)
untarMappings := idtools.NewIDMappingsFromMaps(convertedUIDMap, convertedGIDMap)
archiver := chrootarchive.NewArchiverWithChown(nil, chownOpts, untarMappings)
if hasher != nil {
originalUntar := archiver.Untar
archiver.Untar = func(tarArchive io.Reader, dest string, options *archive.TarOptions) error {
return originalUntar(io.TeeReader(tarArchive, hasher), dest, options)
}
}
return archiver.UntarPath
}
// tarPath returns a function which creates an archive of a specified
// location in the container's filesystem, mapping permissions using the
// container's ID maps
func (b *Builder) tarPath() func(path string) (io.ReadCloser, error) {
convertedUIDMap, convertedGIDMap := convertRuntimeIDMaps(b.IDMappingOptions.UIDMap, b.IDMappingOptions.GIDMap)
tarMappings := idtools.NewIDMappingsFromMaps(convertedUIDMap, convertedGIDMap)
return func(path string) (io.ReadCloser, error) {
return archive.TarWithOptions(path, &archive.TarOptions{
Compression: archive.Uncompressed,
UIDMaps: tarMappings.UIDs(),
GIDMaps: tarMappings.GIDs(),
})
}
}
// getProcIDMappings reads mappings from the named node under /proc.
func getProcIDMappings(path string) ([]rspec.LinuxIDMapping, error) {
var mappings []rspec.LinuxIDMapping
f, err := os.Open(path)
if err != nil {
return nil, errors.Wrapf(err, "error reading ID mappings from %q", path)
}
defer f.Close()
scanner := bufio.NewScanner(f)
for scanner.Scan() {
line := scanner.Text()
fields := strings.Fields(line)
if len(fields) != 3 {
return nil, errors.Errorf("line %q from %q has %d fields, not 3", line, path, len(fields))
}
cid, err := strconv.ParseUint(fields[0], 10, 32)
if err != nil {
return nil, errors.Wrapf(err, "error parsing container ID value %q from line %q in %q", fields[0], line, path)
}
hid, err := strconv.ParseUint(fields[1], 10, 32)
if err != nil {
return nil, errors.Wrapf(err, "error parsing host ID value %q from line %q in %q", fields[1], line, path)
}
size, err := strconv.ParseUint(fields[2], 10, 32)
if err != nil {
return nil, errors.Wrapf(err, "error parsing size value %q from line %q in %q", fields[2], line, path)
}
mappings = append(mappings, rspec.LinuxIDMapping{ContainerID: uint32(cid), HostID: uint32(hid), Size: uint32(size)})
}
return mappings, nil
}
// getHostIDs uses ID mappings to compute the host-level IDs that will
// correspond to a UID/GID pair in the container.
func getHostIDs(uidmap, gidmap []rspec.LinuxIDMapping, uid, gid uint32) (uint32, uint32, error) {
uidMapped := true
for _, m := range uidmap {
uidMapped = false
if uid >= m.ContainerID && uid < m.ContainerID+m.Size {
uid = (uid - m.ContainerID) + m.HostID
uidMapped = true
break
}
}
if !uidMapped {
return 0, 0, errors.Errorf("container uses ID mappings, but doesn't map UID %d", uid)
}
gidMapped := true
for _, m := range gidmap {
gidMapped = false
if gid >= m.ContainerID && gid < m.ContainerID+m.Size {
gid = (gid - m.ContainerID) + m.HostID
gidMapped = true
break
}
}
if !gidMapped {
return 0, 0, errors.Errorf("container uses ID mappings, but doesn't map GID %d", gid)
}
return uid, gid, nil
}
// getHostRootIDs uses ID mappings in spec to compute the host-level IDs that will
// correspond to UID/GID 0/0 in the container.
func getHostRootIDs(spec *rspec.Spec) (uint32, uint32, error) {
if spec.Linux == nil {
return 0, 0, nil
}
return getHostIDs(spec.Linux.UIDMappings, spec.Linux.GIDMappings, 0, 0)
}
// getRegistries obtains the list of registries defined in the global registries file.
func getRegistries() ([]string, error) {
registryConfigPath := ""
envOverride := os.Getenv("REGISTRIES_CONFIG_PATH")
if len(envOverride) > 0 {
registryConfigPath = envOverride
}
searchRegistries, err := sysregistries.GetRegistries(&types.SystemContext{SystemRegistriesConfPath: registryConfigPath})
if err != nil {
return nil, errors.Wrapf(err, "unable to parse the registries.conf file")
}
return searchRegistries, nil
}
// hasRegistry returns a bool/err response if the image has a registry in its
// name
func hasRegistry(imageName string) (bool, error) {
imgRef, err := reference.Parse(imageName)
if err != nil {
return false, err
}
registry := reference.Domain(imgRef.(reference.Named))
if registry != "" {
return true, nil
}
return false, nil
}
|
