This is some code which modifies the parse tree after parsing to adjust the precedence of operators. The way pest deals with this is with the precedence climber. Is not permitted because expr has itself as the most left most rule. This means that if you want to write a simple calculator, you have to re-write rules in a non-left recursive way, in other words the left-most rule in a definition cannot be the rule itself. pest uses PEG grammars, without left recursion. LR(1) complexity makes it hard to reason about. ![]() I’ve read Parsing Techniques by Dick Grune just to fully grok what can be done with LR(1) grammars. The grammar contains all sorts of tricks to avoid shift-reduce errors, which make the grammar totally unreadable. The Solang Solidity Compiler uses an lalrpop grammar. This can make it very hard to write some grammars often you’ll be faced with the dreaded shift-reduce errors. This means there can only be one token lookahead, and no backtracking. First of all, there is lalrpop, which uses LR(1) grammars. When you want to use a parser generator with rust, there are a few options. This PEG parser generator allows left recursion which makes PEG grammars much more useful. I’d like to introduce a new PEG parser generator for rust, called lrpeg. You can always connect to the console of the actions runner with virsh console actions-runner. Systemctl -user enable rviceĪnd you should be in business. Print( 'error: failed to start action-runner')ĭef lifecycle (conn, dom, event, detail, opaque):Ĭonn.domainEventRegister(lifecycle, None)Ĭreate a file ~/.config/systemd/user/rvice: 1ĮxecStart=/home/sean/runner-image/actions-vm-respawn.py Os.system( 'qemu-img snapshot -a restore-me sean-ci-linux-arm64.qcow2') Print( 'error: cannot find action-runner') Print( 'error: failed to connect to the hypervisor')ĭom0 = conn.lookupByName( 'action-runner') 1ĮventLoopThread = threading.Thread(target=virEventLoopNativeRun, name= "libvirtEventLoop") I could not find a way of doing this in shell script, so this is done using the python libvirt api. ![]() Now we’re going to create a script which restores the snapshot, starts the VM, and loops when the VM shuts down. Qemu-img snapshot -c restore-me sean-ci-linux-arm64.qcow Once it is shutdown, create a snapshot using: 1 Now your VM should be ready for snapshotting, so shut it down with shutdown -h now. WorkingDirectory=/home/runner/actions-runner 1ĮxecStart=/home/runner/actions-runner/runshutdown.sh Note this could probably be a user service. In the same directory as the runner, create a shell script called runshutdown.sh with the following contents: 1Īlso create a service in /etc/systemd/system/rvice. Do not install the service, we will be creating our own. Now in your VM, download the github runner as instructed by github in your project settings, and configure it and register it using. You can remove a password with passwd -d. I would create a user called runner, with no password and no root password either, so that sudo apt-get install foo. disk /home/sean/runner-image/sean-ci-linux-arm64.qcow2,device=disk,bus=virtio \ ![]() Virt-install -n action-runner -memory 16384 -arch aarch64 -vcpus 8 \ Qemu-img create /home/sean/runner-image/sean-ci-linux-arm64.qcow2 -f qcow2 200G So, I think the best way to go about this is to run the runner in a VM, which then shuts itself down after each run, and then is restored from a VM snapshot. The other consideration is that you would like each time that your runner executes some code, it has a clean environment with no residue from the last run. There are a few attack vectors here: someone could create a pull request with some malicious code in it ( there is some mitigation against this), or github itself might be coerced into sending malicious commands to your runner. This software connects to github, and listens to instructions of what jobs to run. In order to run the runner, you run some dotnet code called the GitHub Actions Runner. So, I bought a Traverse Ten64 with the hope of using it as a github actions runner for the Solang Solidity Compiler. Github actions is great, but it does not offer any arm hardware to run your tests on.
0 Comments
Leave a Reply. |