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See https://pantheon.io/docs/pantheon-yml on how to change these and here is an example pantheon.yml.
Security Updates
You can't use Drush to apply security updates to a Drupal 7 site on Pantheon.
If you are not using Composer, you may need to pull in security updates through the upstream. Pantheon requires a Pressflow based Drupal 7 distribution which can be applied by pulling in upstream changes from the Drops 7 distribution: https://github.com/pantheon-systems/drops-7
If git gives an error preventing you from "merging unrelated histories", you may need to use this command to pull the upstream changes for a security update:
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git pull --no-rebase --squash -Xtheirs drops-7-upstream master --allow-unrelated-histories |
The command above is the same one used same one used (except the remote is to the Drops-7 upstream instead of Pantheon) when initially migrating to Pantheon if you opted to preserve pre-existing git history (https://pantheon.io/docs/migrate-manual).
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