lockfile | 易学教程

How to enforce only one running instance of a process in python Django framework?

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问题 I have a python Django manage command that should be called upon receiving an input file but this command is not safe for parallel calls. So an input file should be processed only and only when there is no other file being processed. One solution that I have is to use a lock file. Basically, create a lock file at the start of the process and delete it at the end. I'm worried that if the process crashes the lock file won't be deleted and consequently none of the other files would be processed

How to have yarn fail on yarn install when package.json and yarn.lock are out of sync?

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问题 On a project I have replaced npm with yarn to get the benefits of it, and also enforce our dependencies are locked in via the yarn.lock . Now, a developer added a library with npm@4, which only changed the package.json, and not of course the the yarn.lock. I would have expected the yarn install command to crash on the build server, yet yarn has the--to me unexpected behavior--of adding those libraries in their most current version and then updating the yarn.lock on the remote: $ yarn install

Detecting that files are being copied in a folder

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问题 I am running a script which copies one folder from a specific location if it does not exist( or is not consistent). The problems appears when I run concurently the script 2+ times. As the first script is trying to copy the files, the second comes and tryes the same thing resulting in a mess. How could I avoid this situation? Something like system wide mutex. I tryed a simple test with -w , I manually copied the folder and while the folder was copying I run the script: use strict; use warnings

What is the best way to ensure only one instance of a Bash script is running? [duplicate]

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问题 This question already has answers here : Quick-and-dirty way to ensure only one instance of a shell script is running at a time (39 answers) Closed 2 years ago . What is the simplest/best way to ensure only one instance of a given script is running - assuming it's Bash on Linux? At the moment I'm doing: ps -C script.name.sh > /dev/null 2>&1 || ./script.name.sh but it has several issues: it puts the check outside of script it doesn't let me run the same script from separate accounts - which I

I don't understand the results from #service tomcat6 status

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问题 I'm trying to get Tomcat 6 running on Fedora 14. I'm quite new to this sort of thing, though I have managed to get Apache running before. I suspect I've made mistakes on some quite basic levels, because the test page (http://localhost:8080) can't be found. If I try to check the service's status, as root or as an ordinary user, this is what I get: tomcat6 (pid) is running...[OK] tomcat6 lockfile exists but process is not running [FAILED] So I'm confused, because I seem to be being told that

NPM lockfiles/shrinkwrap get random “dl” parameter tacked on to the “resolved” URL

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问题 Our company uses an Artifactory repository for storing internally-published packages and as a proxy for the NPM registry. Sometimes the resolved field in lockfiles/shrinkwrap files is as expected, containing URLs for our internal repository, but occasionally they show up as something like this (line break added for clarity): https://our.repository.com/artifactory/api/npm/some-repo/lodash/-/lodash-3.10.1.tgz ?dl=https://registry.npmjs.org/lodash/-/lodash-3.10.1.tgz Then, from pull request to

Waiting for another flutter command to release the startup lock

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问题 When I run my flutter application it show Waiting for another flutter command to release the startup lock this messages and not proceed further. 回答1: In my case, following command in Terminal helped (as suggested by Günter): killall -9 dart On Windows (as suggested by upupming): taskkill /F /IM dart.exe 回答2: Remove this file: <YOUR FLUTTER FOLDER>/bin/cache/lockfile This releases the occupied lock and makes you able to run other commands. 回答3: In Windows : Press: Ctrl + Alt + Delete In task

NPM lockfiles/shrinkwrap get random “dl” parameter tacked on to the “resolved” URL

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Our company uses an Artifactory repository for storing internally-published packages and as a proxy for the NPM registry. Sometimes the resolved field in lockfiles/shrinkwrap files is as expected, containing URLs for our internal repository, but occasionally they show up as something like this (line break added for clarity): https://our.repository.com/artifactory/api/npm/some-repo/lodash/-/lodash-3.10.1.tgz ?dl=https://registry.npmjs.org/lodash/-/lodash-3.10.1.tgz Then, from pull request to pull requests, these dl parameters constantly oscillate to being present or removed depending on which

Waiting for another flutter command to release the startup lock

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When I run my flutter application it show Waiting for another flutter command to release the startup lock this messages and not proceed further. Sukhi In my case, following command in Terminal helped (as suggested by Günter): killall -9 dart On Windows (as suggested by upupming): taskkill /F /IM dart.exe Remove this file: <YOUR FLUTTER FOLDER>/bin/cache/lockfile This releases the occupied lock and makes you able to run other commands. deep soft In Windows : Press: Ctrl + Alt + Delete In task manager find out your editor such as VS Studio or Android Studio In that Find "dart" and End that Task

Python: module for creating PID-based lockfile?

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I'm writing a Python script that may or may not (depending on a bunch of things) run for a long time, and I'd like to make sure that multiple instances (started via cron) don't step on each others toes. The logical way to do this seems to be a PID-based lockfile… But I don't want to re-invent the wheel if there is already code to do this. So, is there a Python module out there which will manage the details of a PID-based lockfile? If you can use GPLv2, Mercurial has a module for that: http://bitbucket.org/mirror/mercurial/src/tip/mercurial/lock.py Example usage: from mercurial import error,