build: add shm-size support

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

build/build.go

@@ -57,6 +57,7 @@ type Options struct {
 	ImageIDFile string
 	ExtraHosts  []string
 	NetworkMode string
+	ShmSize     opts.MemBytes
 	Ulimits     *opts.UlimitOpt
 
 	NoCache   bool
@@ -556,6 +557,11 @@ func toSolveOpt(ctx context.Context, d driver.Driver, multiDriver bool, opt Opti
 	}
 	so.FrontendAttrs["add-hosts"] = extraHosts
 
+	// setup shm size
+	if opt.ShmSize.Value() > 0 {
+		so.FrontendAttrs["shm-size"] = strconv.FormatInt(opt.ShmSize.Value(), 10)
+	}
+
 	// setup ulimits
 	ulimits, err := toBuildkitUlimits(opt.Ulimits)
 	if err != nil {

commands/build.go

@@ -47,6 +47,7 @@ type buildOptions struct {
 	extraHosts  []string
 	networkMode string
 	quiet       bool
+	shmSize     opts.MemBytes
 	ulimits     *opts.UlimitOpt
 
 	// unimplemented
@@ -127,6 +128,7 @@ func runBuild(dockerCli command.Cli, in buildOptions) (err error) {
 		ImageIDFile: in.imageIDFile,
 		ExtraHosts:  in.extraHosts,
 		NetworkMode: in.networkMode,
+		ShmSize:     in.shmSize,
 		Ulimits:     in.ulimits,
 	}
 
@@ -313,6 +315,7 @@ func buildCmd(dockerCli command.Cli, rootOpts *rootOptions) *cobra.Command {
 	flags.StringSliceVar(&options.extraHosts, "add-host", []string{}, "Add a custom host-to-IP mapping (format: `host:ip`)")
 	flags.SetAnnotation("add-host", "docs.external.url", []string{"https://docs.docker.com/engine/reference/commandline/build/#add-entries-to-container-hosts-file---add-host"})
 	flags.StringVar(&options.imageIDFile, "iidfile", "", "Write the image ID to the file")
+	flags.Var(&options.shmSize, "shm-size", "Size of `/dev/shm`")
 	flags.Var(options.ulimits, "ulimit", "Ulimit options")
 
 	// not implemented
@@ -332,8 +335,6 @@ func buildCmd(dockerCli command.Cli, rootOpts *rootOptions) *cobra.Command {
 	flags.MarkHidden("memory")
 	flags.StringVar(&ignore, "memory-swap", "", "Swap limit equal to memory plus swap: `-1` to enable unlimited swap")
 	flags.MarkHidden("memory-swap")
-	flags.StringVar(&ignore, "shm-size", "", "Size of `/dev/shm`")
-	flags.MarkHidden("shm-size")
 	flags.Int64VarP(&ignoreInt, "cpu-shares", "c", 0, "CPU shares (relative weight)")
 	flags.MarkHidden("cpu-shares")
 	flags.Int64Var(&ignoreInt, "cpu-period", 0, "Limit the CPU CFS (Completely Fair Scheduler) period")

docs/reference/buildx_build.md

@@ -35,6 +35,7 @@ Start a build
 | [`--push`](#push) | Shorthand for `--output=type=registry` |
 | `-q`, `--quiet` | Suppress the build output and print image ID on success |
 | `--secret stringArray` | Secret file to expose to the build (format: `id=mysecret,src=/local/secret`) |
+| [`--shm-size bytes`](#shm-size) | Size of `/dev/shm` |
 | `--ssh stringArray` | SSH agent socket or keys to expose to the build (format: `default\|<id>[=<socket>\|<key>[,<key>]]`) |
 | [`-t`](https://docs.docker.com/engine/reference/commandline/build/#tag-an-image--t), [`--tag stringArray`](https://docs.docker.com/engine/reference/commandline/build/#tag-an-image--t) | Name and optionally a tag (format: `name:tag`) |
 | [`--target string`](https://docs.docker.com/engine/reference/commandline/build/#specifying-target-build-stage---target) | Set the target build stage to build. |
@@ -319,6 +320,12 @@ $ docker buildx create --use --name insecure-builder --buildkitd-flags '--allow-
 $ docker buildx build --allow security.insecure .
 ```
 
+### <a name="shm-size"></a> Size of `/dev/shm` (--shm-size)
+
+The format is `<number><unit>`. `number` must be greater than `0`. Unit is
+optional and can be `b` (bytes), `k` (kilobytes), `m` (megabytes), or `g`
+(gigabytes). If you omit the unit, the system uses bytes.
+
 ### <a name="ulimit"></a> Set ulimits (--ulimit)
 
 `--ulimit` is specified with a soft and hard limit as such: