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39 changes: 38 additions & 1 deletion docs/source/el7toel8/envars.md
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Actors in the el7toel8 repository use environment variables specified below.
All these envars use the suggested prefixes specified in
[the best practices document](../best-practices.html#use-the-leapp-and-leapp-devel-prefixes-for-new-envars)
[the best practices document](../best-practices#use-the-leapp-and-leapp-devel-prefixes-for-new-envars)
for the leapp project to distinguish their purpose: *production* or *devel* use.

If the argument for envars below is not specified, it is expected to set `0`
(false) or `1` (true).

## LEAPP_NO_RHSM

Do not use Red Hat Subscription Management for the upgrade. Using it has the
same effect as using the `--no-rhsm` leapp option.

## LEAPP_OVL_SIZE

For any partition that uses XFS with the ftype option set to 0, Leapp is
creating a file of a specific size in order to proceed with the upgrade.
By default, the size of that file is 2048 MB. In case the size needs to be
increased, Leapp informs you in the pre-upgrade report that the environment
variable needs to be specified.


## LEAPP_DEBUG

Enables debug logging. Equivalent to `--debug`, which takes precedence.


## LEAPP_VERBOSE

Enables debug logging. Equivalent to `--verbose`, which takes precedence.


## LEAPP_CONFIG

Overrides the default location of `leapp.conf`. If not specified,
`leapp/leapp.conf` is used when the command is executed inside a leapp
repository, otherwise the default `/etc/leapp/leapp.conf` is used.


## LEAPP_LOGGER_CONFIG

Overrides the default location of `logger.conf`. If not specified, the default
`/etc/leapp/logger.conf` is used.


## LEAPP_UNSUPPORTED

Necessary to use in case you use any envar with the LEAPP_DEVEL prefix
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