install/lvm2: look for a add_systemd_unit "function" specifically
Replace command -v with declare -F to be consistent with the mdadm_udev
hook.
Redirect any potential stderr output to /dev/null too, since we only care about the return code.
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Replace command -v with declare -F to be consistent with the mdadm_udev
hook.
Redirect any potential stderr output to /dev/null too, since we only care about the return code.