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autorestic/docs/pages/location/hooks.md

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# Hooks
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If you want to perform some commands before and/or after a backup, you can use hooks.
They consist of a list of commands that will be executed in the same directory as the target `from`.
The following hooks groups are supported, none are required:
- `before`
- `after`
- `failure`
- `success`
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```yml | .autorestic.yml
locations:
my-location:
from: /data
to: my-backend
hooks:
before:
- echo "One"
- echo "Two"
- echo "Three"
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after:
- echo "Byte"
failure:
- echo "Something went wrong"
success:
- echo "Well done!"
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```
## Flowchart
1. `before` hook
2. Run backup
3. `after` hook
4. - `success` hook if no errors were found
- `failure` hook if at least one error was encountered
If the `before` hook encounters errors the backup and `after` hooks will be skipped and only the `failed` hooks will run.
## Environment variables
All hooks are exposed to the `AUTORESTIC_LOCATION` environment variable, which contains the location name.
The `after` and `success` hooks have access to additional information with the following syntax:
```bash
AUTORESTIC_[TYPE]_[I]
AUTORESTIC_[TYPE]_[BACKEND_NAME]
```
Every type of metadata is appended with both the name of the backend associated with and the number in which the backends where executed.
### Available Metadata Types
- `SNAPSHOT_ID`
- `PARENT_SNAPSHOT_ID`
- `FILES_ADDED`
- `FILES_CHANGED`
- `FILES_UNMODIFIED`
- `DIRS_ADDED`
- `DIRS_CHANGED`
- `DIRS_UNMODIFIED`
- `ADDED_SIZE`
- `PROCESSED_FILES`
- `PROCESSED_SIZE`
- `PROCESSED_DURATION`
#### Example
Assuming you have a location `bar` that backs up to a single backend named `foo` you could expect the following env variables:
```bash
AUTORESTIC_LOCATION=bar
AUTORESTIC_FILES_ADDED_0=42
AUTORESTIC_FILES_ADDED_FOO=42
```