system/fastboot: Add support for fastboot oem shell

To support executing custom commands.

Usage

  fastboot oem shell <command>

Tests

  # Configuration "esp32s3-devkit:fastboot" with `SYSTEM_FASTBOOTD_SHELL` enabled

  $ fastboot --version
  fastboot version 35.0.2-12147458

  $ fastboot oem shell ls /FILE_NOT_EXISTS
  FAILED (remote: 'error detected 0xff00 4')
  fastboot: error: Command failed

  $ fastboot oem shell ps
    PID GROUP PRI POLICY   TYPE    NPX STATE    EVENT     SIGMASK            STACK COMMAND
      0     0   0 FIFO     Kthread   - Ready              0000000000000000 0003056 Idle_Task
      1     0 224 RR       Kthread   - Waiting  Semaphore 0000000000000000 0001976 hpwork 0x3fc8bd50 0x3fc8bd80
      2     2 100 RR       Task      - Waiting  Semaphore 0000000000000000 0004048 nsh_main
      3     3 100 RR       Task      - Ready              0000000000000000 0001992 fastbootd
      4     4 100 RR       Task      - Running            0000000000000000 0001992 popen -c ps
  OKAY [  0.010s]
  Finished. Total time: 0.010s

Signed-off-by: wangjianyu3 <[email protected]>

Author: JianyuWang0623

system/fastboot/Kconfig

@@ -31,4 +31,14 @@ config FASTBOOTD_USB_BOARDCTL
 	---help---
 		Connect usbdev before running fastboot daemon.
 
+config SYSTEM_FASTBOOTD_SHELL
+	bool "Execute custom commands"
+	default n
+	depends on SCHED_CHILD_STATUS
+	depends on SYSTEM_POPEN
+	---help---
+		Enable to support executing custom commands.
+		e.g. fastboot oem shell ps
+		e.g. fastboot oem shell "mkrd -m 10 -s 512 640"
+
 endif # SYSTEM_FASTBOOTD

system/fastboot/fastboot.c

@@ -44,6 +44,7 @@
 #include <sys/statfs.h>
 #include <sys/types.h>
 #include <sys/poll.h>
+#include <sys/wait.h>
 
 /****************************************************************************
  * Pre-processor Definitions
@@ -178,6 +179,10 @@ static void fastboot_memdump(FAR struct fastboot_ctx_s *context,
                              FAR const char *arg);
 static void fastboot_filedump(FAR struct fastboot_ctx_s *context,
                               FAR const char *arg);
+#ifdef CONFIG_SYSTEM_FASTBOOTD_SHELL
+static void fastboot_shell(FAR struct fastboot_ctx_s *context,
+                           FAR const char *arg);
+#endif
 
 /****************************************************************************
  * Private Data
@@ -198,7 +203,10 @@ static const struct fastboot_cmd_s g_fast_cmd[] =
 static const struct fastboot_cmd_s g_oem_cmd[] =
 {
   { "filedump",           fastboot_filedump         },
-  { "memdump",            fastboot_memdump          }
+  { "memdump",            fastboot_memdump          },
+#ifdef CONFIG_SYSTEM_FASTBOOTD_SHELL
+  { "shell",              fastboot_shell            },
+#endif
 };
 
 /****************************************************************************
@@ -774,6 +782,37 @@ static void fastboot_filedump(FAR struct fastboot_ctx_s *context,
   fastboot_okay(context, "");
 }
 
+#ifdef CONFIG_SYSTEM_FASTBOOTD_SHELL
+static void fastboot_shell(FAR struct fastboot_ctx_s *context,
+                           FAR const char *arg)
+{
+  char response[FASTBOOT_MSG_LEN - 4];
+  FILE *fp;
+  int ret;
+
+  fp = popen(arg, "r");
+  if (fp == NULL)
+    {
+      fastboot_fail(context, "popen() fails %d", errno);
+      return;
+    }
+
+  while (fgets(response, sizeof(response), fp))
+    {
+      fastboot_ack(context, "TEXT", response);
+    }
+
+  ret = pclose(fp);
+  if (WIFEXITED(ret) && WEXITSTATUS(ret) == 0)
+    {
+      fastboot_okay(context, "");
+      return;
+    }
+
+  fastboot_fail(context, "error detected 0x%x %d", ret, errno);
+}
+#endif
+
 static void fastboot_upload(FAR struct fastboot_ctx_s *context,
                             FAR const char *arg)
 {