[OE-Core][PATCH v1] wic: implement reproducible Disk GUID

[OE-Core][PATCH v1] wic: implement reproducible Disk GUID

[Adithya Balakumar]

From: Adithya Balakumar <adithya.balakumar@toshiba-tsip.com>

GPT based disks have a disk guid apart from the 32-bit disk identifier.
This commit implements reproducible disk guid by using SOURCE_DATE_EPOCH (if available) value as a random seed

Signed-off-by: Adithya Balakumar <adithya.balakumar@toshiba-tsip.com>
---
 scripts/lib/wic/plugins/imager/direct.py | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/scripts/lib/wic/plugins/imager/direct.py b/scripts/lib/wic/plugins/imager/direct.py
index 9b619e41c1..d0f8481c2e 100644
--- a/scripts/lib/wic/plugins/imager/direct.py
+++ b/scripts/lib/wic/plugins/imager/direct.py
@@ -530,6 +530,21 @@ class PartitionedImage():
         exec_native_cmd("parted -s %s mklabel %s" % (device, ptable_format),
                         self.native_sysroot)
 
+    def _write_disk_guid(self):
+        if os.getenv('SOURCE_DATE_EPOCH'):
+            if self.ptable_format in ('gpt', 'gpt-hybrid'):
+                self.disk_guid = uuid.UUID(int=int(os.getenv('SOURCE_DATE_EPOCH')))
+            elif self.ptable_format == "msdos":
+                self.disk_guid = '0x' + str(uuid.UUID(int=int(os.getenv('SOURCE_DATE_EPOCH'))).int & 0xFFFFFFFF)[:8]
+        else:
+            if self.ptable_format in ('gpt', 'gpt-hybrid'):
+                self.disk_guid = uuid.uuid4()
+            elif self.ptable_format == "msdos":
+                self.disk_guid = '0x' + str(uuid.uuid4())[:8]
+
+        logger.debug("Set disk guid %s", self.disk_guid)
+        sfdisk_cmd = "sfdisk --disk-id %s %s" % (self.path, self.disk_guid)
+        exec_native_cmd(sfdisk_cmd, self.native_sysroot)
 
     def create(self):
         self._make_disk(self.path,
@@ -537,6 +552,7 @@ class PartitionedImage():
                         self.min_size)
 
         self._write_identifier(self.path, self.identifier)
+        self._write_disk_guid()
 
         if self.ptable_format == "gpt-hybrid":
             mbr_path = self.path + ".mbr"
-- 
2.39.2

Re: [OE-Core][PATCH v1] wic: implement reproducible Disk GUID

[Alexandre Belloni]

Hello,

This causes oe-selftest failures:

https://autobuilder.yoctoproject.org/typhoon/#/builders/79/builds/6342/steps/15/logs/stdio

2024-01-25 02:21:53,130 - oe-selftest - INFO - RESULTS - runqemu.RunqemuTests.test_boot_machine_slirp_qcow2: ERROR (1028.13s)
2024-01-25 02:21:53,131 - oe-selftest - INFO - RESULTS - runqemu.RunqemuTests.test_boot_recipe_image_vdi: ERROR (1031.11s)
2024-01-25 02:21:53,131 - oe-selftest - INFO - RESULTS - runqemu.RunqemuTests.test_boot_recipe_image_vmdk: ERROR (1075.13s)
2024-01-25 02:21:53,131 - oe-selftest - INFO - RESULTS - wic.Wic2.test_biosplusefi_plugin_qemu: ERROR (1037.31s)
2024-01-25 02:21:53,131 - oe-selftest - INFO - RESULTS - wic.Wic2.test_efi_plugin_unified_kernel_image_qemu: ERROR (1953.51s)
2024-01-25 02:21:53,131 - oe-selftest - INFO - RESULTS - wic.Wic2.test_rawcopy_plugin_qemu: ERROR (1187.55s)

On 22/01/2024 17:55:21+0530, Adithya Balakumar wrote:
> From: Adithya Balakumar <adithya.balakumar@toshiba-tsip.com>
> 
> GPT based disks have a disk guid apart from the 32-bit disk identifier.
> This commit implements reproducible disk guid by using SOURCE_DATE_EPOCH (if available) value as a random seed
> 
> Signed-off-by: Adithya Balakumar <adithya.balakumar@toshiba-tsip.com>
> ---
>  scripts/lib/wic/plugins/imager/direct.py | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/scripts/lib/wic/plugins/imager/direct.py b/scripts/lib/wic/plugins/imager/direct.py
> index 9b619e41c1..d0f8481c2e 100644
> --- a/scripts/lib/wic/plugins/imager/direct.py
> +++ b/scripts/lib/wic/plugins/imager/direct.py
> @@ -530,6 +530,21 @@ class PartitionedImage():
>          exec_native_cmd("parted -s %s mklabel %s" % (device, ptable_format),
>                          self.native_sysroot)
>  
> +    def _write_disk_guid(self):
> +        if os.getenv('SOURCE_DATE_EPOCH'):
> +            if self.ptable_format in ('gpt', 'gpt-hybrid'):
> +                self.disk_guid = uuid.UUID(int=int(os.getenv('SOURCE_DATE_EPOCH')))
> +            elif self.ptable_format == "msdos":
> +                self.disk_guid = '0x' + str(uuid.UUID(int=int(os.getenv('SOURCE_DATE_EPOCH'))).int & 0xFFFFFFFF)[:8]
> +        else:
> +            if self.ptable_format in ('gpt', 'gpt-hybrid'):
> +                self.disk_guid = uuid.uuid4()
> +            elif self.ptable_format == "msdos":
> +                self.disk_guid = '0x' + str(uuid.uuid4())[:8]
> +
> +        logger.debug("Set disk guid %s", self.disk_guid)
> +        sfdisk_cmd = "sfdisk --disk-id %s %s" % (self.path, self.disk_guid)
> +        exec_native_cmd(sfdisk_cmd, self.native_sysroot)
>  
>      def create(self):
>          self._make_disk(self.path,
> @@ -537,6 +552,7 @@ class PartitionedImage():
>                          self.min_size)
>  
>          self._write_identifier(self.path, self.identifier)
> +        self._write_disk_guid()
>  
>          if self.ptable_format == "gpt-hybrid":
>              mbr_path = self.path + ".mbr"
> -- 
> 2.39.2
> 
> 

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-- 
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com