Update readme for postgres restore

postgres-restore-s3/README.md

@@ -1,41 +1,27 @@
-# postgres-backup-s3
+# postgres-restore-s3
 
-Backup PostgresSQL to S3 (supports periodic backups)
+Restore a SQL backup from S3 to PostgresSQL
+
+## Warning
+
+This will potentially put your database in a very bad state or complete destroy your data, be very careful.
+
+## Limitations
+
+This is made to restore a backup made from postgres-backup-s3, if you backup came from somewhere else please check your format.
+
+* Your s3 bucket *must* only contain backups which you wish to restore - it will always grabs the 'latest' based on unix sort with no filtering
+* They must be gzip encoded text sql files
+* If your bucket has more than a 1000 files the latest may not be restore, only one s3 ls command is made
 
 ## Usage
 
 Docker:
 ```sh
-$ docker run -e S3_ACCESS_KEY_ID=key -e S3_SECRET_ACCESS_KEY=secret -e S3_BUCKET=my-bucket -e S3_PREFIX=backup -e POSTGRES_DATABASE=dbname -e POSTGRES_USER=user -e POSTGRES_PASSWORD=password -e POSTGRES_HOST=localhost schickling/postgres-backup-s3
-```
-
-Docker Compose:
-```yaml
-postgres:
-  image: postgres
-  environment:
-    POSTGRES_USER: user
-    POSTGRES_PASSWORD: password
-
-pgbackups3:
-  image: schickling/postgres-backup-s3
-  links:
-    - postgres
-  environment:
-    SCHEDULE: '@daily'
-    S3_REGION: region
-    S3_ACCESS_KEY_ID: key
-    S3_SECRET_ACCESS_KEY: secret
-    S3_BUCKET: my-bucket
-    S3_PREFIX: backup
-    POSTGRES_DATABASE: dbname
-    POSTGRES_USER: user
-    POSTGRES_PASSWORD: password
+$ docker run -e S3_ACCESS_KEY_ID=key -e S3_SECRET_ACCESS_KEY=secret -e S3_BUCKET=my-bucket -e S3_PREFIX=backup -e POSTGRES_DATABASE=dbname -e POSTGRES_USER=user -e POSTGRES_PASSWORD=password -e POSTGRES_HOST=localhost schickling/postgres-restore-s3
 ```
 
-### Automatic Periodic Backups
-
-You can additionally set the `SCHEDULE` environment variable like `-e SCHEDULE="@daily"` to run the backup automatically.
+## Dropping public
 
-More information about the scheduling can be found [here](http://godoc.org/github.com/robfig/cron#hdr-Predefined_schedules).
+If you wish to drop the public schema (drop schema public cascade; create schema public) then set the environment variable DROP_PUBLIC=yes. This is useful for situations where you wish to restore a database which currently has data / schemas in it.