Why does cloning a private git repository via Drush make file fail using SSH authentication?

I have multiple private git accounts set up with SSH system’s keychain authentication for each git repo.

It works to clone private git repos from command line:

git clone git@git_ssh_alias:git-account/some_repo.git

The git_ssh_alias is the alias name declared in .ssh/config file that specifies the SSH key that should be used.

However, this same clone doesn’t work when running from make file via Drush script as following.

From Make file:

projects[theme_name][type] = "theme"
projects[theme_name][version] = 7.x-1.0
projects[theme_name][download][type] = "git"
projects[theme_name][download][url] = "git@git_ssh_alias:git-account/some_repo.git"
projects[theme_name][download][branch] = "master"

From Drush script:

drush_invoke_process('@self', 'make', array($make_file), $options)

where $make_file is a path to a make file and options are:

$options = array();
$options['no-core'] = TRUE;
$options['yes'] = TRUE;
$options['contrib-destination'] = 'sites/all';

My question: How to clone private git repo with local ssh keychain authentication enabled?

This article was republished from its original source.
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Why does cloning a private git repository via Drush make file fail using SSH authentication?

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