Adding upgrade file watcher for cosmovisor.
Currently the comswisor upgrade mechanism relays on parsing log messages. This is not reliable:
+ depends on the log level output (x/upgrade uses INFO)
+ can be hacked by accidentally logging user user content
+ can be broken by using upgrade name which will break the regex pattern.
closes: #7703closes: #8523closes: #8651closes: #8793closes: #8964
**Depends on**:
- #9652
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## Description
Ref: https://github.com/cosmos/cosmos-sdk/issues/9616#issuecomment-873051972
depends: #8590
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This PR adds a full backup option for cosmovisor.
`UNSAFE_SKIP_BACKUP` is an `env` setting introduced newly.
- if `false` (default, **recommended**), cosmovisor will try to take backup and then upgrade. In case of failure while taking backup, it will just halt the process there and won't try the upgrade.
- If `true`, the cosmovisor will try to upgrade without any backup. This setting makes it hard to recover from a failed upgrade. Node operators either need to sync from a healthy node or use a snapshot from others.
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{,cosmosvisor/}Makefile: Add Makefile to cosmovisor/
subdirectory and integrate build target into the
top-directory Makefile.
cosmovisor/:
Create Golang-idiomatic cmd/ subdirectory to make
`cosmosvisor` binary (instead of a binary named `cmd`)
automatically installable with `go get`.
Minor changes to error handling:
- Plain error strings bring more value than the whole
stacktrace in case of dumb configuration errors.
- Output errors to /dev/stderr instead of /dev/stdout.
Remove dependency on github.com/pkg/errors.
Robert Zaremba
Anil Kumar Kammari
Alessio Treglia