It's not just "sort of" possible to install SwiftLint on Linux. It has been supported for a long time now.

Although the exact steps aren't listed in the readme, so I admit doing so hasn't been very discoverable.

Here's one way to install SwiftLint on Ubunutu from scratch.

Let's create a brand new Linux machine on Digital Ocean and SSH into it:

$ doctl compute droplet create swiftlint --size 16gb \
    --image ubuntu-16-10-x64 --region sfo1
$ doctl compute ssh swiftlint

Once you're in, install Swift (curl here or your preferred installation method e.g. swiftenv):

$ apt-get update
$ apt-get install -y clang libblocksruntime0 libcurl4-openssl-dev
$ SWIFT_VERSION=swift-4.0-RELEASE
$ BASE_URL=https://swift.org/builds/swift-4.0-release/ubuntu1610
$ URL=$BASE_URL/$SWIFT_VERSION/$SWIFT_VERSION-ubuntu16.10.tar.gz
$ curl $URL | tar xz --directory $HOME --strip-components=1

Set $PATH to find the Swift binaries and $LINUX_SOURCEKIT_LIB_PATH to find
SourceKit:

$ export PATH=$HOME/usr/bin:$PATH
$ export LINUX_SOURCEKIT_LIB_PATH=$HOME/usr/lib

Clone, build & run SwiftLint on its own codebase:

$ git clone https://github.com/realm/SwiftLint.git
$ cd SwiftLint
$ swift run -c release swiftlint
Fetching https://github.com/Carthage/Commandant.git
Fetching https://github.com/jpsim/SourceKitten.git
Fetching https://github.com/jpsim/Yams.git
...
Compile Swift Module 'SwiftLintFramework' (208 sources)
Compile Swift Module 'swiftlint' (10 sources)
Linking ./.build/x86_64-unknown-linux/release/swiftlint
Loading configuration from '.swiftlint.yml'
Linting Swift files in current working directory
Linting 'UnusedClosureParameterRule.swift' (1/262)
Linting 'MultipleClosuresWithTrailingClosureRule.swift' (2/262)
Linting 'WeakDelegateRule.swift' (3/262)
Linting 'NimbleOperatorRule.swift' (4/262)
...
Linting 'TodoRuleTests.swift' (259/262)
Linting 'ConfigurationTests+ProjectMock.swift' (260/262)
Linting 'AttributesRuleTests.swift' (261/262)
Linting 'LinuxMain.swift' (262/262)
Done linting! Found 0 violations, 0 serious in 262 files.

To run SwiftLint using a different version of SourceKit, update $LINUX_SOURCEKIT_LIB_PATH.

Support Linux #732

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