[sonic_installer]Add --skip-platform-check option for sonic_installer…

… when image mismatch (sonic-net#1791)

What I did
Add --skip-platform-check option for sonic_installer;

How I did it
Add --skip-platform-check option for sonic_installer when image ASIC mismatch;
Split verify_binary_image to verify_secureboot_image and verify_image_platform to handle
image verification more accurately.

How to verify it
Installing a bin file which differs the running platform's ASIC will fail. 

Previous command output (if the output of a command-line utility has changed)
sudo sonic-installer install --help
Usage: sonic-installer install [OPTIONS] URL
Install image from local binary or URL
Options:
-y, --yes
-f, --force_install Force installation of an image of a type which
differs from that of the current running image
--skip_migration Do not migrate current configuration to the newly
installed image
--skip-package-migration Do not migrate current packages to the newly
installed image
--help Show this message and exit.

New command output (if the output of a command-line utility has changed)
Options:
-y, --yes
-f, --force, --skip-secure-check
Force installation of an image of a non-
secure type than secure running image
--skip-platform-check Force installation of an image of a type
which is not of the same platform
--skip_migration Do not migrate current configuration to the
newly installed image
--skip-package-migration Do not migrate current packages to the newly
installed image
--help Show this message and exit.

sonic_installer/bootloader/aboot.py

@@ -163,7 +163,10 @@ def get_binary_image_version(self, image_path):
             return None
         return IMAGE_PREFIX + version.strip()
 
-    def verify_binary_image(self, image_path):
+    def verify_image_platform(self, image_path):
+        return os.path.isfile(image_path)
+
+    def verify_secureboot_image(self, image_path):
         try:
             subprocess.check_call(['/usr/bin/unzip', '-tq', image_path])
             return self._verify_secureboot_image(image_path)

sonic_installer/bootloader/bootloader.py

@@ -49,8 +49,12 @@ def get_binary_image_version(self, image_path):
         """returns the version of the image"""
         raise NotImplementedError
 
-    def verify_binary_image(self, image_path):
-        """verify that the image is supported by the bootloader"""
+    def verify_image_platform(self, image_path):
+        """verify that the image is of the same platform than running platform"""
+        raise NotImplementedError
+
+    def verify_secureboot_image(self, image_path):
+        """verify that the image is secure running image"""
         raise NotImplementedError
 
     def verify_next_image(self):

sonic_installer/bootloader/grub.py

@@ -8,13 +8,17 @@
 
 import click
 
+from sonic_py_common import device_info
 from ..common import (
    HOST_PATH,
    IMAGE_DIR_PREFIX,
    IMAGE_PREFIX,
    run_command,
 )
 from .onie import OnieInstallerBootloader
+from .onie import default_sigpipe
+
+MACHINE_CONF = "installer/machine.conf"
 
 class GrubBootloader(OnieInstallerBootloader):
 
@@ -81,6 +85,36 @@ def remove_image(self, image):
         run_command('grub-set-default --boot-directory=' + HOST_PATH + ' 0')
         click.echo('Image removed')
 
+    def verify_image_platform(self, image_path):
+        if not os.path.isfile(image_path):
+            return False
+
+        # Get running platform's ASIC
+        try:
+            version_info = device_info.get_sonic_version_info()
+            if version_info:
+                asic_type = version_info['asic_type']
+            else:
+                asic_type = None
+        except (KeyError, TypeError) as e:
+            click.echo("Caught an exception: " + str(e))
+
+        # Get installing image's ASIC
+        p1 = subprocess.Popen(["sed", "-e", "1,/^exit_marker$/d", image_path], stdout=subprocess.PIPE, preexec_fn=default_sigpipe)
+        p2 = subprocess.Popen(["tar", "xf", "-", MACHINE_CONF, "-O"], stdin=p1.stdout, stdout=subprocess.PIPE, preexec_fn=default_sigpipe)
+        p3 = subprocess.Popen(["sed", "-n", r"s/^machine=\(.*\)/\1/p"], stdin=p2.stdout, stdout=subprocess.PIPE, preexec_fn=default_sigpipe, text=True)
+
+        stdout = p3.communicate()[0]
+        image_asic = stdout.rstrip('\n')
+
+        # Return false if machine is not found or unexpected issue occur
+        if not image_asic:
+            return False
+
+        if asic_type == image_asic:
+            return True
+        return False
+
     @classmethod
     def detect(cls):
         return os.path.isfile(os.path.join(HOST_PATH, 'grub/grub.cfg'))

sonic_installer/bootloader/onie.py

@@ -44,5 +44,5 @@ def get_binary_image_version(self, image_path):
 
         return IMAGE_PREFIX + version_num
 
-    def verify_binary_image(self, image_path):
+    def verify_secureboot_image(self, image_path):
         return os.path.isfile(image_path)

sonic_installer/bootloader/uboot.py

@@ -77,6 +77,9 @@ def remove_image(self, image):
         subprocess.call(['rm','-rf', HOST_PATH + '/' + image_dir])
         click.echo('Done')
 
+    def verify_image_platform(self, image_path):
+        return os.path.isfile(image_path)
+
     @classmethod
     def detect(cls):
         arch = platform.machine()

sonic_installer/main.py

@@ -480,8 +480,10 @@ def sonic_installer():
 @sonic_installer.command('install')
 @click.option('-y', '--yes', is_flag=True, callback=abort_if_false,
               expose_value=False, prompt='New image will be installed, continue?')
-@click.option('-f', '--force', is_flag=True,
-              help="Force installation of an image of a type which differs from that of the current running image")
+@click.option('-f', '--force', '--skip-secure-check', is_flag=True,
+              help="Force installation of an image of a non-secure type than secure running image")
+@click.option('--skip-platform-check', is_flag=True,
+              help="Force installation of an image of a type which is not of the same platform")
 @click.option('--skip_migration', is_flag=True,
               help="Do not migrate current configuration to the newly installed image")
 @click.option('--skip-package-migration', is_flag=True,
@@ -500,7 +502,7 @@ def sonic_installer():
               cls=clicommon.MutuallyExclusiveOption, mutually_exclusive=['skip_setup_swap'],
               callback=validate_positive_int)
 @click.argument('url')
-def install(url, force, skip_migration=False, skip_package_migration=False,
+def install(url, force, skip_platform_check=False, skip_migration=False, skip_package_migration=False,
             skip_setup_swap=False, swap_mem_size=None, total_mem_threshold=None, available_mem_threshold=None):
     """ Install image from local binary or URL"""
     bootloader = get_bootloader()
@@ -530,10 +532,17 @@ def install(url, force, skip_migration=False, skip_package_migration=False,
             echo_and_log('Error: Failed to set image as default', LOG_ERR)
             raise click.Abort()
     else:
-        # Verify that the binary image is of the same type as the running image
-        if not bootloader.verify_binary_image(image_path) and not force:
+        # Verify not installing non-secure image in a secure running image
+        if not bootloader.verify_secureboot_image(image_path) and not force:
             echo_and_log("Image file '{}' is of a different type than running image.\n".format(url) +
-                "If you are sure you want to install this image, use -f|--force.\n" +
+                "If you are sure you want to install this image, use -f|--force|--skip-secure-check.\n" +
+                "Aborting...", LOG_ERR)
+            raise click.Abort()
+
+        # Verify that the binary image is of the same platform type as running platform
+        if not bootloader.verify_image_platform(image_path) and not skip_platform_check:
+            echo_and_log("Image file '{}' is of a different platform type than running platform.\n".format(url) +
+                "If you are sure you want to install this image, use --skip-platform-check.\n" +
                 "Aborting...", LOG_ERR)
             raise click.Abort()