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This began with the want of adding SSH keys to ssh-agend on demand, but because this isn't possible with OpenSSH, I came up with this zsh script instead. But for a reason I can't figure out, instead of only running "before" ssh or git, it is run before anything, even empty commands.

git ssh () {
    # Does the agent handle any keys?
    ssh-add -l &>/dev/null

    # True if last executed command (ssh-add -l) exits non-zero.
    if [ $? -ne 0 ]; then
        ssh-add
    fi

    # Execute git or ssh with all parameters, and not this function
    command $0 "$@"
}

Why does this function execute after every command instead of only when git or ssh is entered?

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I tried the function with zsh -f (which I should have done before posting..), and found that it worked as expected. Something else is causing this issue, so I'm closing this question when able.

EDIT:

For those interested in what the issue was, and how it was solved, look below.

I used the zsh framework ZIM which uses vcs_info to check if the current directory is used by git or not. This requires a call to git. vcs_info itself does not call git directly, it would seem, not by default.

However, thanks to ft on #zsh on Freenode, adding

zstyle ':vcs_info:git:*:-all-' command =git

to ~/.zshrc after the framework has been sourced, has fixed this issue.

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