Restore kops from versioned S3

restore-kops.sh

#!/usr/bin/env bash
set -euo pipefail
IFS=$'\n\t'
DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"

# 2018-01-30T11:53:46.000Z
RESTORE_BEFORE="$1"

BUCKET="k8s.example.com"
PREFIX="eu-central-1.k8s.example.com"

function restore {
    FILE="$1"
    VERSION="$2"

    TMP="/tmp/file"
    set -x
    aws s3api get-object --version-id="$VERSION" --bucket="$BUCKET" --key "$FILE" "$TMP" >/tmp/log.txt
    aws s3 cp "$TMP" "s3://$BUCKET/$FILE"
    { set +x; } 2>/dev/null
}

IFS=$'\n'
for LINE in $(aws s3 ls --recursive "$BUCKET/$PREFIX/"); do
    FILE="$(echo "$LINE" | awk '{print $4}')"
    echo "$FILE"

    for PAIR in $(aws s3api list-object-versions --bucket "$BUCKET" --prefix "$FILE" | jq -r '.Versions[] | "\(.LastModified) \(.VersionId)"'); do
        CREATED_AT="$(echo "$PAIR" | awk '{print $1}')"
        if [[ "$CREATED_AT" < "$RESTORE_BEFORE" ]]; then
            echo "  $CREATED_AT is good"
            VERSION="$(echo "$PAIR" | awk '{print $2}')"
            echo "    restore $VERSION"
            restore "$FILE" "$VERSION"
            break
        else
            echo "  $CREATED_AT skipped"
        fi
    done
    read
done

usage.txt

restore all files to versions older than "2018-01-30T11:53"
```
restore-kops.sh "2018-01-30T11:53"
```

restore all files to versions older than "2018-01-30" (eg <="2018-01-29")
```
restore-kops.sh "2018-01-30"
```