tagging fails if there's no ~/.gitconfig, and you get the following error:

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[workspace] $ git tag -a -f -m "Hudson Build #34" hudson-JAMCircle-34
FATAL: Could not apply tag hudson-JAMCircle-34
hudson.plugins.git.GitException: Could not apply tag hudson-JAMCircle-34
at hudson.plugins.git.GitAPI.tag(GitAPI.java:265)
at hudson.plugins.git.GitSCM$4.invoke(GitSCM.java:560)
at hudson.plugins.git.GitSCM$4.invoke(GitSCM.java:521)
at hudson.FilePath.act(FilePath.java:635)
at hudson.plugins.git.GitSCM.checkout(GitSCM.java:521)
at hudson.model.AbstractProject.checkout(AbstractProject.java:830)
at
hudson.model.AbstractBuild$AbstractRunner.checkout(AbstractBuild.java:314)
at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:266)
at hudson.model.Run.run(Run.java:927)
at hudson.model.Build.run(Build.java:112)
at hudson.model.ResourceController.execute(ResourceController.java:93)
at hudson.model.Executor.run(Executor.java:119)
Caused by: hudson.plugins.git.GitException: Error performing git tag -a -f -m
Hudson Build #34 hudson-JAMCircle-34
at hudson.plugins.git.GitAPI.launchCommandIn(GitAPI.java:302)
at hudson.plugins.git.GitAPI.launchCommand(GitAPI.java:276)
at hudson.plugins.git.GitAPI.tag(GitAPI.java:263)
... 11 more
Caused by: hudson.plugins.git.GitException: Command returned status code 128:

• • • Please tell me who you are.

Run

git config --global user.email "you@example.com"
git config --global user.name "Your Name"

to set your account's default identity.
Omit --global to set the identity only in this repository.
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git plugin should recover from this error by setting the user-wide name
information automatically.