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43 lines
1.4 KiB
43 lines
1.4 KiB
#!/bin/bash
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# this file is meant to be sourced, not executed directly
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# if destination argument is not provided, fail
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if [[ $# -lt 1 ]]; then
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echo "$(basename $BASH_SOURCE): error: no destination provided!" >&2
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return 1
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elif [[ $# -gt 1 ]]; then
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echo "$(basename $BASH_SOURCE): error: too many arguments!" >&2
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return 1
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fi
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# provide sshp command for executing commands on remote computer
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sshp() {
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echo "$@" >&$_sshp_in
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echo "echo EOF" >&$_sshp_in
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sed '/EOF/Q' <$_sshp_out
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}
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# assign dest to variable
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_sshp_dest=$1
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# create temporary directory
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_sshp_tmpdir=$(mktemp -d)
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mkfifo $_sshp_tmpdir/in $_sshp_tmpdir/out
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_sshp_out=$_sshp_tmpdir/out
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# assign input to a file descriptor so it doesn't get closed
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exec {_sshp_in}<>$_sshp_tmpdir/in
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# trap exit to do cleanup
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trap "{ exec {_sshp_in}>&-; ssh -O exit -S $_sshp_tmpdir/ssh $_sshp_dest &>/dev/null; rm -rf $_sshp_tmpdir; }" EXIT
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# login with master so ssh can ask password if necessary
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ssh -M -Nf -S $_sshp_tmpdir/ssh $_sshp_dest
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# login with redirection for the persistent connection
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ssh -S $_sshp_tmpdir/ssh medusa 0<&$_sshp_in 1>$_sshp_out 2>$_sshp_out &
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# clear output
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sshp true &> /dev/null
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# ask for password and run sudo so password can be cached
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(printf "[sudo] password for $(sshp echo \$USER)@$(sshp hostname): "
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read -s password
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printf '\n'
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echo "sudo -S true" >&$_sshp_in
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echo $password >&$_sshp_in)
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# clear output again
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sshp true &> /dev/null
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