Pro ios continuous integration pdf

Trends in iOS DevOps

Other companies work with MacStadium to add dedicated Mac mini or Mac Pro servers to their environment or go a step further to set up private clouds that allow them to create macOS VMs as build and test machines for the ultimate in scalability and performance. We surveyed over 40 MacStadium customers running CI use cases to learn more about their organizations, processes and teams. These include some big, well-known brands as well as new startups that you may not have heard of.

While it does correlate with the company sizes nearly half of the respondents work in organizations with 50 employees or fewer , large companies can have small iOS development teams as well. Less than a quarter are developing primarily for macOS. While nearly half of the respondents said their average app build time takes 5 to 10 minutes, reported build times ranged from a few seconds to over an hour.

For example, macOS apps are often more complex with more lines of code than iOS apps, resulting in longer build times. Also note that these times typically do not include testing associated with the integration process. The majority of surveyed MacStadium customers run build jobs per day. However, some larger companies reported running over 1, builds per day!

One such respondent runs builds on every commit and supports a large team of developers. Some of our customers do this using VMware and linked clones on a private cloud with Mac Pro hardware.


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There are a lot of great continuous integration tools available in the market today, but based on our survey data, Jenkins is still leading the pack. This may be due to its free and open-source status. When asked what other DevOps tools are being used at their organization, respondents said…. The UI is now built right into Xcode. Code coverage data alone means nothing, if you are not constantly keeping track of it. Once your tests suite grows to something near the scale we are working at this can become harder than one might think.

Our tests, even with ludicrous speed enabled, take about 10 minutes to complete for one configuration. Typically, we are testing all the major iOS versions we support on both the iPhone and iPad. Luckily, Xcode 7 has you covered here as well. There are multiple reasons for this but mainly it boils down to the fact that it simply does not work with our GitHub based workflow.

Even with third party tools, like Buildasaur , it all just takes way too long for our massive mono-repo. Instead of Xcode Server, we rely on Jenkins for all our continuous integration needs.

Xcode Continuous Integration for iOS Tutorial - (Jenkins, CI, TDD, SVN, OCUnit, TestFlight)

Before Xcode 7, we already had code coverage reporting set up with Jenkins. We generated coverage data in the gcov format and used LCOV together with a custom script to integrate the coverage data into Jenkins. It all worked pretty well. However, with the introduction of Xcode 7, Apple dropped support for the legacy gcc coverage file format and introduced a format of its own: Of course this broke our setup as soon as we migrated our CI servers to Xcode 7. As framework developers, we always have to be early adopters of the latest iOS versions, so we can make sure our code is ready before our clients make the switch.

Unfortunately, this means in some cases we need to make a few compromises.

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In this particular circumstance, it meant dropping code coverage because there were simply no convenient tools around to get the data into Jenkins. Xcode ships with llvm-cov , a command line tool that can convert the coverage data into a more human readable format. However, there is still quite a bit of work needed to get it into a format that Jenkins could handle. We still had coverage enabled locally, but due to the aforementioned test suite run times, it wasn't much help.

Soon after we discovered Slather , a great little Ruby tool that can convert gcc coverage data to various other formats, we saw there was some work underway for it to handle the new profdata format.


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  • Unfortunately, we had bigger fish to fry at that time, so we couldn't help much but continued to keep one eye on the progress being made. We have been flying blind for over a year now, so it really was time to finally get code coverage back on track. There have been some great new additions made to Slather recently, so it seemed like a good time to give it a try. For our setup, we were mostly interested in the Cobertura XML format.

    Jenkins has a decent Cobertura plugin , which is what we had used with our previous setup. Like most things with Jenkins, it does not look all that great but it gets the job done. We already used a Rake script to drive our command line builds, so getting Slather in as a dependency was pretty straightforward. We wanted the latest and greatest features so we set up our Gemfile to use the latest master version:.

    Pro iOS Continuous Integration | Romain Pouclet | Apress

    You can pass in configuration options to Slather as command line arguments or put them inside a. In our setup, we use a combination of both. In most cases you should be fine with just putting everything in. Normally tests would be part of your main app project. However, back in the day when we distributed source code builds, we decided to separate them out so they were not included in those builds. Now a days, our setup is actually even more complex than before.

    CI is more popular now than ever, as iOS developers realize how time-consuming building and deploying an application for testing purposes and quality assurance can be. This book shows you how to make your developing life easier, with real-world applications and examples. With this book, you will learn what continuous integration and continuous delivery really are and how they can be used in your iOS projects. You'll understand how to leverage the power of the command line to build your projects, and run your tests.

    You'll use Jenkins and Bamboo to architect automatic builds and automate the whole build process. In addition, you'll also learn how to use Xcode server and bots, what quality assurance tools can be used to measure the quality of your code, and how to send builds to your beta testers. Author Romain Pouclet provides hands-on, practical experience in iOS continuous integration and, using this book, you will see that it's not actually that hard to set up a fully-featured continuous integration platform, whether you are an independent iOS developer working from home or a member of a team in a big company.

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