Detects the shell running on the host reachable via exec and returns a map describing it.

Arguments

Takes a map with:

• :exec - an executor function that runs a script string on the target host and returns {:exit int :out string :err string}.

Returns

A map with:

• :type - keyword identifying the detected shell family: :bash, :zsh, :sh, :dash, :ksh, :busybox, :fish, :nu, :powershell or :cmd-exe. This is the type of the currently executing shell we are inside.
• :version - the shell version string, e.g. "5.2.15(1)-release".
• :shell - path of the currently running shell executable, i.e. the process actually executing the probe scripts. This is obtained from the running process (POSIX /proc/$$/exe / $0, the Windows process path, …) and not from $SHELL, so it reflects the shell actually executing rather than the configured login shell, e.g. "/usr/bin/bash".
• :login-shell - path of the users login shell $SHELL e.g. "/bin/bash".
• :canonical-path - fully resolved path of the users login shell binary, e.g. "/usr/bin/bash". (For :cmd-exe there is a :path key instead, holding the value of %COMSPEC%.)

The returned map is the :shell input expected by the other fact gatherers (eyre.os/gather-os, eyre.hardware/gather-hardware, eyre.users/gather-users, eyre.filesystem/gather-filesystem, eyre.network/gather-network and eyre.bins/gather-paths), which use :type to select the appropriate embedded collection script.

Detection runs small embedded probe scripts through exec and inspects their output, so nothing needs to be installed on the target host. Asserts if any probe script exits non-zero.

Example

(shell/gather-shell {:exec local-exec})
;; => {:type :bash
;;     :version "5.2.15(1)-release"
;;     :shell "/usr/bin/bash"
;;     :login-shell "/bin/bash"
;;     :canonical-path "/usr/bin/bash"}