Janus is a tool for versioning and deploying builds to Google Cloud Provider (GCP) Storage from the CI environment.

Install

CI System Requirements:

• JSON GCP Service Account Key, with access to GCP Storage enabled.
• CI environment variable GCP_PASSWD to be set if the key is encrypted.
• openssl is required for key decryption. This is standard on Travis. AppVeyor may require that you add some extra things to your PATH, but you may not have to install anything extra.
• gpg is required to verify the Janus binary. This is standard on Travis and AppVeyor.
• gpg can also be used for key decryption (with symmetric cipher). This solution is more portable than openssl encryption.
• rev, curl, and a few other basic bash commands are required for the installer script. Standard on Travis, can be added to PATH for AppVeyor as per example below

Install Janus:

Travis

- curl -sL https://raw.githubusercontent.com/ETCDEVTeam/janus/master/get.sh | bash
- export PATH=./janusbin:$PATH

AppVeyor

- set PATH=C:\msys64\mingw64\bin;C:\msys64\usr\bin\;%PATH%
- curl -sL https://raw.githubusercontent.com/ETCDEVTeam/janus/master/get-windows.sh | bash
- set PATH=./janusbin;%PATH%

Security note: The installer scripts get.sh and get-windows.sh will use GPG to verify the latest Janus release binary against the signing GPG key downloaded from a specific commit at ethereumproject/volunteer. For an additional layer of security, you may use the provided installer script signatures (./*.sig) to verify the installer script itself before using Janus to deploy from your CI build. For maximum security, use a locally tracked version of the signing key in your own repo. Alternatively, you can mimic the installer script itself, and use curl to download the key from the specific commit as mentioned previously. The link is:

https://raw.githubusercontent.com/ethereumproject/volunteer/7a78a94307d67a0b20e418568b7bccac83c3d143/Volunteer-Public-Keys/isaac.ardis%40gmail.com

In practice, this would look like:

 - curl -sLO https://raw.githubusercontent.com/ethereumproject/volunteer/7a78a94307d67a0b20e418568b7bccac83c3d143/Volunteer-Public-Keys/isaac.ardis%40gmail.com
 - gpg --import isaac.ardis@gmail.com
 - curl -sLO https://raw.githubusercontent.com/ETCDEVTeam/janus/master/get.sh
 - curl -sLO https://raw.githubusercontent.com/ETCDEVTeam/janus/master/get.sh.sig
 - gpg --verify get.sh.sig get.sh
 - chmod +x get.sh
 - bash get.sh

Note that if you implement this additional layer and the signing key changes, you'll need to update either your tracked version of the key or download link accordingly.

Usage

Janus has two subcommands: deploy and version.

Deploy

Janus can use an encrypted or decrypted .json GCP service key file. In case of an encrypted JSON key file, Janus will attempt to decrypt it using openssl, and depends on an environment variable GCP_PASSWD to be set. After successfully decrypting the key and deploying the files, Janus will automatically destroy (rm) the decrypted key from the CI.

flag	example	description
-to	builds.etcdevteam.com/go-ethereum/v3.5.x/	bucket, followed by 'directory' in which to hold the uploaded archive
-files	./dist/*.zip	file(s) to upload, can use relative or absolute path and/or wildcard globbing
-key	./gcloud-travis.enc.json	encrypted or decrypted JSON GCP service key file

$ janus deploy -to builds.etcdevteam.com/go-ethereum/v3.5.x/ -files ./dist/*.zip -key gcloud-service-encrypted-or-decrypted.json
> Deploying...

Version

version uses git subcommands to produce a version number, as defined by -format

$ janus version -format='v%M.%m.%P+%C-%S'
> v3.5.0+55-asdf123

-format=value takes the interpolated forms:

%M, _M - major version
%m, _m - minor version
%P, _P - patch version
%B, _B - hybrid patch version: `(%P * 100) + %C`
%C, _C - commit count since last tag
%S, _S - HEAD sha1 (first 7 characters)

Note: you may use either %M or _M syntax to interpolate version variables, since escaping % in batch scripts is rather tricky.

So this:

sed output (.txt)	format syntax
version-base.txt	-format v%M.%m.x
version-app.txt	-format v%M.%m.%P+%C-%S

replaces this:

- git describe --tags --always > version.txt
- sed -E 's/v([[:digit:]]+\.[[:digit:]]+)\.[[:digit:]]-([[:digit:]]+)-g([a-f0-9]+)/v\1.\2+\3/' version.txt > version-app.txt
- sed -E 's/v([[:digit:]]+\.[[:digit:]]+)\.[[:digit:]]-([[:digit:]]+).+/v\1.\2/' version.txt > version-only.txt
- sed -E 's/v([[:digit:]]+\.[[:digit:]]+)\.[[:digit:]]-([[:digit:]]+).+/v\1.x/' version.txt > version-base.txt

Examples and notes

Please visit the /examples directory to find example Travis and AppVeyor configuration files, deploy script, and service key.

Encrypting files

With OpenSSL

To encrypt file with openssl you should use following command:

openssl aes-256-cbc -e -in input_file.json -out output_file.json.enc

With GPG

To encrypt file with gpg you should use following command:

gpg --symmetric --cipher-algo AES-256 --output output_file.json.enc input_file.json

Different --cipher-algo may be used as well.

Gotchas

The same version of openssl should be used for file encryption and decryption.

---

If you use a script deploy for Travis, ensure that the deploy script is executable, eg.

deploy:
  skip_cleanup: true
  provider: script
  script: ./deploy.sh # <-- chmod +x
  on:
    branch: master
  tags: true

---

An encrypted GCP_PASSWD cannot be used between repos; each GCP_PASSWD encryption should be specific to a repo.

For Appveyor and Travis there are two ways to establish environment variables:

1. In the configuration file itself, eg.

# Encrypt GCP_PASSWD for Travis
$ travis encrypt GCP_PASSWD=abcd
> 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

# .travis.yml
env:
  global:
    - secure: "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"

2. In the CI GUI under Environment or Settings. In this case you should use the unencrypted password. Don't worry, it won't be visible in the logs.

In both cases, environment GCP_PASSWD will be now available for use.

---

In ancient Roman religion and myth, Janus (/ˈdʒeɪnəs/; Latin: Iānus, pronounced [ˈjaː.nus]) is the god of beginnings, gates, transitions, time, duality, doorways,[1] passages, and endings.

• https://en.wikipedia.org/wiki/Janus