aws-micro-cli

This tool is a minimalist replacement for aws, the command line interface to Amazon Web Services. It's implemented in Bash with only a few dependencies to other tools. The requests to the AWS API endpoints are done with curl.

It can be used for example together with lightweight Linux distributions such as Alpine Linux to build very small docker images. It only supports a very limited number of commands and options but for these commands and options it aims to be as close as possible to the original. For example

    aws s3 cp foo.css s3://some-bucket/ --content-type text/css

can be replaced with the exact same commands/options

    aws-micro s3 cp foo.css s3://some-bucket/ --content-type text/css

This tool is not associated with Amazon in any way.

Installation

Download the latest release, move it to some convenient location (e.g. /usr/local/bin/), set the environment variables AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY and you're ready to go.

Make sure you have required unix tools installed. Assuming a fresh installation of macOS and minimal docker container images for the Linux distributions, you need to install:

OS	required packages	optional packages
macOS	-	-
Rocky Linux	openssl	file
Ubuntu	openssl, curl	file
Debian	openssl, curl	file
Alpine Linux	openssl, curl, bash	file

The package file is needed for content type detection.

If you clone the repo, be aware that aws-micro sources additional files and can only be run from the repo directory. The release version has everything merged into one single file.

Compatibility

Supported services: s3, s3api, sts

Configuration settings and credentials set in ~/.aws are ignored, with the exception of profiles (see below). The path to the configuration file can be set with AWS_CONFIG_FILE. It defaults to $HOME/.aws/config. Credentials must be configured via the environment variables AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY. The region can be set either via command line option or AWS_DEFAULT_REGION. The output of aws-micro will in many cases differ from aws.

The s3 commands work also with S3-compatible services like minio and probably others.

Supported commands and options

For a detailed description of the commands and option have a look at the aws-cli documentation.

Global options:

   --debug (boolean)

   --dryrun (boolean)
   (Contrary to `aws` this will work on all commands)

   --endpoint-url (string)

   --profile (string)
   (only `role_arn` in combination with `credential_source=Environment` is currently supported, no
   caching of temporary credentials)

   --region (string)

   --version (string)

   --no-sign-request (boolean)

s3

aws-micro will only use virtual-hosted–style requests when used with AWS. This could break e.g. requests to buckets with . in the name. If a custom endpoint-url is set, a path-style request is used. See https://docs.aws.amazon.com/AmazonS3/latest/dev/VirtualHosting.html and https://aws.amazon.com/blogs/aws/amazon-s3-path-deprecation-plan-the-rest-of-the-story/

S3Uri with S3 access points are not supported.

The content type detection will differ from aws. aws-micro should be able to detect more file types because it uses the file command which utilizes libmagic. See also aws/aws-cli#2163. If file is not available no content type is set and a warning is print.

---

cp <LocalPath> <S3Uri> or <S3Uri> <LocalPath>

Not supported:

cp <S3Uri> <S3Uri>

Options:

--acl (string)
--no-guess-mime-type (boolean)
--sse (string)
--storage-class (string)
--content-type (string)

---

ls <S3Uri> or NONE

Output date/time will always be in UTC while aws would calculate the date/time for your timezone. No additional option supported.

Known bugs:

• If the response is too big and split into multiple chunks (tag <NextContinuationToken> in the response), only the keys of the first response are shown and no further requests are done.

---

mb <S3Uri>

s3api

create-bucket

Options:

--bucket <value>

sts

assume-role

Options:

--role-arn <value>
--role-session-name <value>

The output is in XML while aws will transform the output to JSON.

Changelog

All notable changes to this project will be documented here.

The format is based on Keep a Changelog and this project adheres to Semantic Versioning.

v0.3.0 - 2023-11-12

Added

• Command s3 mb implemented.
• Basic help for each command implemented.

Changed

• Various changes in GitHub Actions for testing different Linux distributions and versions:
  • Removed Ubuntu 18.04 as it's out of support and fails with actions/checkout v4.
  • Added Ubuntu "rolling" and Debian "unstable-slim".
  • Removed macos-10, added macos-13.
  • Removed Alpine 3.14 and 3.15, added 3.17 and 3.18

Fixed

• Set digest explicitly when calling openssl sha256 to support Rocky Linux 9.

v0.2.1 - 2022-08-02

Fixed

• s3 ls lists keys inside folders correctly

v0.2.0 - 2020-06-28

Added

• Command s3api create-bucket implemented.
• Command sts assume-role implemented.
• Option --acl for s3 cp implemented.
• Option --no-guess-mime-type for s3 cp implemented.
• Option --sse for s3 cp implemented.
• Option --storage-class for s3 cp implemented.
• Option --no-sign-request implemented.
• Option --profile implemented.
• Environment variable AWS_CONFIG_FILE supported.

Changed

• If file is missing, no content type is set and a warning is print.
• When region us-east-1 is set, the local endpoint will be used (e.g. bucket.s3.us-east-1.amazonaws.com) instead of the global one.

Fixed

• Environment variable AWS_DEFAULT_REGION was ignored
• Handle different date format when listing buckets
• Output was missing when downloading files from S3
• s3 ls works now also without s3:// prefix
• Support of AWS S3 global endpoint if no region is specified

v0.1.0 - 2020-05-23

• Initial public release.

Contributing

Pull requests are welcome. The unit tests are written with https://github.com/bats-core/bats-core. Run with bats tests/. Make use of the excellent tool shellcheck (https://www.shellcheck.net/). Run with shellcheck -x -a aws-micro.

License

Copyright 2020 Thilo Uttendorfer

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License version 3 as published by the Free Software Foundation.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see https://www.gnu.org/licenses/.