![]() # Switch to working from that directory, it's as if we did a permanent `cd` into it WORKDIR /valgrind_project_tmp/ # Run any pre-build commands, or run `:` by default, which is a no-op RUN # Add all the project files to a temporary directory inside the container ADD. # Install build toolchain, valgrind and let the user specify any additional dependencies RUN apt-get install -y build-essential valgrind # ubuntu:18.04 is the default image, the user can change it FROM ubuntu:18.04 # Update apt-get RUN apt-get update -y Sure to remove that Dockerfile and not mess up the user's project, so it does the job Maybe I'm dumb and misread the docs, but I make System: while the lib is very useful, for some reason it only lets me specify aĭockerfile inside the build directory I give Docker, so I need to actually put theĭockerfile in the project's directory. Project with temp files? This is actually because of the Python docker library I'm using to interface with Docker on the host This might sound weird, I mean why infect the user's neat So how does it work? Well, it first creates a Dockerfile in the project directory The same temporary folder in the container, so we need to be able to find the binary ![]() ![]() The path must be relative to the project directoryīecause Docker will only copy the contents of the project directory in the container weĭon't care if the project is 10 layers deep in your machine, it's gonna end up living in Where, after building, the binary we want to test can be found under $ macgrind ~/my_c_project/ bin/my_program ![]() In short, the interface with the user looks like: Thus needs to be fed the actual path of the project. Will not be able to copy stuff that's out of the path provided to the container, and The binary to test with Valgrind, relative to the directory. This is why Macgrind needs at least two arguments: the directory of the project, and Machine the same executable will not run natively in the container, meaning we can't We would just be able to run Valgrind and not bother with any of this, obviously),īecause the container and the OS would share the kernel, but since we're on a macOS This would work if we were on a Linux machine (in which case The project and run it with Valgrind, all while capturing the container's output andīut why do we need to rebuild the project inside the container? Can't we just run it Install basic tools (gcc, make etc), Valgrind and any additional dependencies, build The principle is very simple: instead of spinning up a heavy VM, we can just use a README on Macgrind's repo explains how it can be used, so here I'm going to explain Options so that you can integrate it with little effort in your build process. Python program that basically handles all of that logic and offers some additional That's why I decided to write Macgrind, a What if it needs to run other commands before building? Well, I need toĪdd them to the shell command that runs the Docker container. Has dependencies? Well, I need to remember to install them via the apt-get command in It's indeed way more elegant than a VM, but still very inflexible: what if my program Of course, I'm not the first person to come up with this solution. Yeah yeah, I know, it's kind of a trend to use Docker everywhere,īut here it really makes sense. A VM is another solution, but all of these "heavy" solutions seem very veryīulky and inefficient I just want to be able to run Valgrind on a project in a way thatĬan easily be automated (for CI purposes for example, or even local tests). ![]() Iĭon't have the necessary real estate for that on the MacBook, so that's out of the I mean, there are relatively simple solutions to this. The latest version of Valgrind does not support macOS > 10.13. Which is definitely not the latest version right now): The problem is that I often develop on my MacBook, and as of the time of this writing,Īny macOS release past 10.13 (macOS High Sierra) is not supported (I run macOS 10.14 Leak checks it can even help spot times where you use uninitialized variables forĮxample, even if the bug doesn't come up in runtime. It actually does much more than simple memory I've used Valgrind throughout (andĮven before) my uni years, and I love it. There's a great tool for helping you verify that your program does not have The trouble is that you often forget to free some of it, or accidentally free Via malloc() or something like that, and then you're supposed to free it using, well,įree(). That means that you usually need to go and "ask" for a piece of memory What's a memory leak? Well, in C and C++ (but mostly C), you manage If you have developed anything on C/C++, you probably have gotten into dreaded memory Macgrind: containerized Valgrind on macOS! ![]()
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