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Clarify OVERWRITE_OLD_IMAGE docs

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There has been some confusion about what this environment variable
controls, and it isnt very clear in the docs.

Change-Id: Id21b3c5ce361c4d1121eb7015020235b4c0a2f36
This commit is contained in:
Gregory Haynes 2016-08-15 12:13:52 -07:00
parent cf2030c2f6
commit 62efc03732
1 changed files with 3 additions and 1 deletions
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doc/source/developer/invocation.rst
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@ -19,7 +19,9 @@ to the end of the path if a path is supplied.
By default, the image building scripts will not overwrite existing
disk images, allowing you to compare the newly built image with the
existing one. To change that behaviour, set the variable
``OVERWRITE_OLD_IMAGE`` to any value that isn't ``0``.
``OVERWRITE_OLD_IMAGE`` to any value that isn't ``0``. If this value is
zero then any existing image will be moved before the new image is
written to the destination.
Setting the variable ``DIB_SHOW_IMAGE_USAGE`` will print out a
summarised disk-usage report for the final image of files and