Hello Everyone,
I’m trying to generate and apply a delta from $MENDER_ARTIFACT_FROM to $MENDER_ARTIFACT_TO`
these are the steps I took:
$ export MENDER_ARTIFACT_FROM="1/image-qemux86-64-20200420165809.mender"
$ export MENDER_ARTIFACT_TO="2/image-qemux86-64-20200420180715.mender"
$ mender-artifact read $MENDER_ARTIFACT_FROM
Mender artifact:
Name: image-qemux86-64-mo-develop-20200420165809-0.0.2
Format: mender
Version: 3
Signature: no signature
Compatible devices: '[qemux86-64]'
Provides group:
Depends on one of artifact(s): []
Depends on one of group(s): []
State scripts:
Updates:
0:
Type: rootfs-image
Provides: Nothing
Depends: Nothing
Metadata: Nothing
Files:
name: image-qemux86-64.ext4
size: 1056964608
modified: 2020-04-20 17:28:42 +0000 UTC
checksum: e6ae6a20ae563692782e61561786cadfb8a163ec2a5ce7d5b42169f0e9ec0aff
$ mender-artifact read $MENDER_ARTIFACT_TO
Mender artifact:
Name: image-qemux86-64-mo-develop-20200420180715-0.0.2
Format: mender
Version: 3
Signature: no signature
Compatible devices: '[qemux86-64]'
Provides group:
Depends on one of artifact(s): []
Depends on one of group(s): []
State scripts:
Updates:
0:
Type: rootfs-image
Provides: Nothing
Depends: Nothing
Metadata: Nothing
Files:
name: image-qemux86-64.ext4
size: 1056964608
modified: 2020-04-20 18:15:24 +0000 UTC
checksum: 7ff174f1c457e02d83a59022dc851ae191c304a780582c57a8fdb90fe032892c
$ export COMMENT="my-delta"
$ mender-binary-delta-generator -n \
$COMMENT \
-o delta.mender \
$MENDER_ARTIFACT_TO \
$MENDER_ARTIFACT_FROM
$ mender-artifact read delta.mender
Mender artifact:
Name: my-delta
Format: mender
Version: 3
Signature: no signature
Compatible devices: '[qemux86-64]'
Provides group:
Depends on one of artifact(s): []
Depends on one of group(s): []
State scripts:
Updates:
0:
Type: mender-binary-delta
Provides: Nothing
Depends: Nothing
Metadata:
{
"delta_algorithm": "xdelta3",
"rootfs_file_size": 1056964608,
"rootfs_image_checksum": "e6ae6a20ae563692782e61561786cadfb8a163ec2a5ce7d5b42169f0e9ec0aff"
}
Files:
name: image-qemux86-64.ext4.delta
size: 2813261
modified: 2020-04-20 19:20:26 +0000 UTC
checksum: aed49fe3f46bc274a753f7b781f1a159cbf56f57260baeea8215c5440f59abc9
the delta rootfs_image_checksum is equal to the checksum $MENDER_ARTIFACT_FROM but when deployed via mender-client the OTA fails with ‘xdelta3: target window checksum mismatch: XD3_INVALID_INPUT’
Apr 20 19:23:36 qemux86-64 mender[452]: time="2020-04-20T19:23:36Z" level=info msg="State transition: update-fetch [Download_Enter] -> update-store [Download_Enter]" module=mender
Apr 20 19:23:36 qemux86-64 mender[452]: time="2020-04-20T19:23:36Z" level=info msg="no public key was provided for authenticating the artifact" module=installer
Apr 20 19:23:37 qemux86-64 mender[452]: time="2020-04-20T19:23:37Z" level=info msg="Update module output: field artifact_provides not found in the type-info file." module=modules
Apr 20 19:23:37 qemux86-64 mender[452]: time="2020-04-20T19:23:37Z" level=info msg="Update module output: Trying to parse transitional meta-data instead..." module=modules
Apr 20 19:23:38 qemux86-64 mender[452]: time="2020-04-20T19:23:38Z" level=info msg="Update module output: xdelta3: target window checksum mismatch: XD3_INVALID_INPUT" module=modules
Apr 20 19:23:38 qemux86-64 mender[452]: time="2020-04-20T19:23:38Z" level=info msg="Update module output: xdelta3: normally this indicates that the source file is incorrect" module=modules
Apr 20 19:23:38 qemux86-64 mender[452]: time="2020-04-20T19:23:38Z" level=info msg="Update module output: xdelta3: please verify the source file with sha1sum or equivalent" module=modules
Apr 20 19:23:38 qemux86-64 mender[452]: time="2020-04-20T19:23:38Z" level=info msg="Update module output: Failed to apply the delta, err: 1" module=modules
some idea where I’m going wrong?, because I’m definitely making some mistakes 
Thank you!