Use string array instead of map

Signed-off-by: Mauricio Vásquez <[email protected]>

Author: mauriciovasquezbernal

config-linux.md

@@ -632,7 +632,7 @@ The following parameters can be specified to set up seccomp:
     If sending to this socket fails, the runtime MUST [generate an error](runtime.md#errors).
     If the `SCMP_ACT_NOTIFY` action is not used this value is ignored.
 
-    The runtime sends the following file descriptors using `SCM_RIGHTS` and set their corresponding indexes in the `fdIndexes` map of the [container process state](#containerprocessstate):
+    The runtime sends the following file descriptors using `SCM_RIGHTS` and set their names in the `fds` array of the [container process state](#containerprocessstate):
 
     * **`seccompFd`** (int, REQUIRED) is the seccomp file descriptor returned by the seccomp syscall.
     * **`pidFd`** (int, OPTIONAL) is the process file descriptor (e.g as returned by `pidfd_open(2)` or by `clone(2)` with the `CLONE_PID` flag).
@@ -713,7 +713,7 @@ If more than one `sendmsg(2)` is used, the file descriptors MUST be sent only in
 The container processs state includes the following properties:
 
 * **`ociVersion`** (string, REQUIRED) is version of the Open Container Initiative Runtime Specification with which the container processs state complies.
-* **`fdIndexes`** (map, OPTIONAL) are the indexes of the file descriptors in the `SCM_RIGHTS` array.
+* **`fds`** (array, OPTIONAL) is a string array containing the names of the file descriptors passed. The index of the name in this array corresponds to index of the file descriptor the `SCM_RIGHTS` array.
 * **`pid`** (int, REQUIRED) is the container process ID, as seen by the runtime.
 * **`metadata`** (string, OPTIONAL) opaque metadata.
 * **`state`** (map, REQUIRED) is the [state](runtime.md#state) of the container.
@@ -723,10 +723,10 @@ Example:
 ```json
 {
     "ociVersion": "0.2.0",
-    "fdIndexes": {
-        "seccompFd": 0,
-        "pidFd": 1
-    },
+    "fds": [
+        "seccompFd",
+        "pidFd"
+    ],
     "pid": 4422,
     "metadata": "MKNOD=/dev/null,/dev/net/tun;BPF_MAP_TYPES=hash,array",
     "state": {

specs-go/state.go

@@ -34,22 +34,21 @@ type State struct {
 	Annotations map[string]string `json:"annotations,omitempty"`
 }
 
-// FdIndexKey is the key used in the FdIndexes map of the ContainerProcessState struct.
-type FdIndexKey string
-
 const (
-	// SeccompFdIndexKey is the index of the seccomp notify file descriptor.
-	SeccompFdIndexKey FdIndexKey = "seccompFd"
-	// PidFdIndexKey is the index of the target process file descriptor.
-	PidFdIndexKey FdIndexKey = "pidFd"
+	// SeccompFdName is the name of the seccomp notify file descriptor.
+	SeccompFdName string = "seccompFd"
+	// PidFdName is the name of the target process file descriptor.
+	PidFdName string = "pidFd"
 )
 
 // ContainerProcessState holds information about the state of a container process.
 type ContainerProcessState struct {
 	// Version is the version of the specification that is supported.
 	Version string `json:"ociVersion"`
-	// FdIndexes is a map containing the indexes of the file descriptors in the `SCM_RIGHTS` array.
-	FdIndexes map[FdIndexKey]int `json:"fdIndexes"`
+	// Fds is a string array containing the names of the file descriptors passed.
+	// The index of the name in this array corresponds to index of the file
+	// descriptor the `SCM_RIGHTS` array.
+	Fds []string `json:"fds"`
 	// Pid is the process ID as seen by the runtime.
 	Pid int `json:"pid"`
 	// Opaque metadata.