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Type: Bug
Resolution: Unresolved
Priority: Minor
Component/s: git-client-plugin, ssh-agent-plugin
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When using different SSH keys (even with the same username, like git) with multiple repos, then the correct key is used for corresponding repo and everything works fine.

If the username of the SSH key (key 1) used in Git SCM checkout matches the username of the SSH key (key 2) used in ssh-agent, git checkout gets broken.

When one removes SSH key (key 2) with same username from ssh-agent, git checkouts work.

This is the error first scenario renders:

08:57:55 Cloning the remote Git repository
08:57:55 Cloning repository git@github.com:example/my-super-repo.git
08:57:55  > git init /home/jenkins/jenkins_root/workspace/my-super-repo-deploy # timeout=10
08:57:55 Fetching upstream changes from git@github.com:example/my-super-repo.git
08:57:55  > git --version # timeout=10
08:57:55 using GIT_SSH to set credentials jenkins/my-super-repo
08:57:55  > git fetch --tags --progress git@github.com:example/my-super-repo.git +refs/heads/:refs/remotes/origin/
08:57:56 ERROR: Error cloning remote repo 'origin'
08:57:56 hudson.plugins.git.GitException: Command "git fetch --tags --progress git@github.com:example/my-super-repo.git +refs/heads/:refs/remotes/origin/" returned status code 128:
08:57:56 stdout:
08:57:56 stderr: ERROR: Repository not found.
08:57:56 fatal: Could not read from remote repository.
08:57:56
08:57:56 Please make sure you have the correct access rights
08:57:56 and the repository exists.
08:57:56
08:57:56        at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandIn(CliGitAPIImpl.java:1903)
08:57:56        at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandWithCredentials(CliGitAPIImpl.java:1622)
08:57:56        at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.access$300(CliGitAPIImpl.java:71)
08:57:56        at org.jenkinsci.plugins.gitclient.CliGitAPIImpl$1.execute(CliGitAPIImpl.java:348)
08:57:56        at org.jenkinsci.plugins.gitclient.CliGitAPIImpl$2.execute(CliGitAPIImpl.java:545)
08:57:56        at org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler$1.call(RemoteGitImpl.java:153)
08:57:56        at org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler$1.call(RemoteGitImpl.java:146)
08:57:56        at hudson.remoting.UserRequest.perform(UserRequest.java:181)
08:57:56        at hudson.remoting.UserRequest.perform(UserRequest.java:52)
08:57:56        at hudson.remoting.Request$2.run(Request.java:336)
08:57:56        at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:68)
08:57:56        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
08:57:56        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
08:57:56        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
08:57:56        at java.lang.Thread.run(Thread.java:745)
08:57:56        at ......remote call to jenkins-slave01-test(Native Method)
08:57:56        at hudson.remoting.Channel.attachCallSiteStackTrace(Channel.java:1554)
08:57:56        at hudson.remoting.UserResponse.retrieve(UserRequest.java:281)
08:57:56        at hudson.remoting.Channel.call(Channel.java:839)
08:57:56        at org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler.execute(RemoteGitImpl.java:146)
08:57:56        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
08:57:56        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
08:57:56        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
08:57:56        at java.lang.reflect.Method.invoke(Method.java:498)
08:57:56        at org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler.invoke(RemoteGitImpl.java:132)
08:57:56        at com.sun.proxy.$Proxy127.execute(Unknown Source)
08:57:56        at hudson.plugins.git.GitSCM.retrieveChanges(GitSCM.java:1070)
08:57:56        at hudson.plugins.git.GitSCM.checkout(GitSCM.java:1110)
08:57:56        at hudson.scm.SCM.checkout(SCM.java:495)
08:57:56        at hudson.model.AbstractProject.checkout(AbstractProject.java:1212)
08:57:56        at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:566)
08:57:56        at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:86)
08:57:56        at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:491)
08:57:56        at hudson.model.Run.execute(Run.java:1737)
08:57:56        at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
08:57:56        at hudson.model.ResourceController.execute(ResourceController.java:97)
08:57:56        at hudson.model.Executor.run(Executor.java:419)

I presume that ssh-agent somehow screws up git SCM plugin credentials.

Since github uses hardcoded username "git" for every github repo, this causes a problem if you need ssh-agent to log in to git@oneof.yourservers.com ...

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