236 lines
8.3 KiB
Bash
236 lines
8.3 KiB
Bash
# Functions.
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_agent_prompt_command() {
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hash ssh-add >/dev/null 2>&1 && {
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local SOCK
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declare -g _SSH_PROMPT_ERROR_ISSUED
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# Check the ssh agent socket is still alive.
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ssh-add -l >/dev/null 2>&1
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if (($? >= 2)); then
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# Auth socket has become unusable, search for a new one.
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SOCK="$(_find_agent_sock)"
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if ((${PIPESTATUS[0]} == 0)); then
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export SSH_AUTH_SOCK="$SOCK"
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_SSH_PROMPT_ERROR_ISSUED=0
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echo "Connected to alternate ssh-agent - you may need to re-add keys."
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else
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if [[ -z "$(egrep -v '^$' ~/.ssh/agents)" ]]; then
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((${_SSH_PROMPT_ERROR_ISSUED:-0} == 0)) && {
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echo "$(tput setaf 1 || tput AF 1)Lost connection to ssh-agent - no alternate available!$(tput op)"
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unset SSH_AUTH_SOCK
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_SSH_PROMPT_ERROR_ISSUED=1
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}
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else
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((${_SSH_PROMPT_ERROR_ISSUED:-0} == 0)) && {
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echo "$(tput setaf 1 || tput AF 1)Lost connection to ssh-agent - failed to connect to new agent!$(tput op)"
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unset SSH_AUTH_SOCK
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_SSH_PROMPT_ERROR_ISSUED=1
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}
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fi
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fi
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else
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_SSH_PROMPT_ERROR_ISSUED=0
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fi
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unset SOCK
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}
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}
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_clean_agent_socks() {
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local I SSH_AUTH_SOCK
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# Go through the array of sockets and validate each one.
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for ((I = 0; I < ${#SOCKS[@]}; I++)); do
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SSH_AUTH_SOCK="${SOCKS[$I]}" ssh-add -l >/dev/null 2>&1
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(($? >= 2)) && {
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unset SOCKS[$I]
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}
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done
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}
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_find_agent_sock() {
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local I IFS=$'\n' REPLY SOCKS=() SSH_AUTH_SOCK="$SSH_AUTH_SOCK"
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# Load the array of sockets, minus the one we know is unusable.
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if ((${BASH_VERSINFO[0]} >= 4)); then
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mapfile -t SOCKS < <(egrep -v "^$SSH_AUTH_SOCK\$" ~/.ssh/agents 2>/dev/null)
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else
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while read -r; do
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SOCKS+=("$REPLY")
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done < <(egrep -v "^$SSH_AUTH_SOCK\$" ~/.ssh/agents 2>/dev/null)
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fi
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# Search backwards through the list to find an active socket.
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for ((I = (${#SOCKS[@]} - 1); I >= 0; I--)); do
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SSH_AUTH_SOCK="${SOCKS[$I]}" ssh-add -l >/dev/null 2>&1
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(($? <= 1)) && [[ ! -z "${SOCKS[$I]}" ]] && {
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printf "%s" "${SOCKS[$I]}"
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return 0
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}
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done
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return 1
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}
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_lock_agents_file() {
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local I
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# Lock the ~/.ssh/agents file.
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if [[ "$_PLATFORM" == "Linux" ]]; then
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# Linux has 'flock', thankfully.
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if exec 9>~/.ssh/agents.lock && flock -E 10 -w 0.5 9; then
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return 0
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else
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echo "$(tput setaf 1 || tput AF 1)Failed to obtain lockfile!$(tput op)"
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fi
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elif [[ "$_PLATFORM" == "Darwin" ]]; then
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# Do locking the sucky way on OSX.
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for ((I=0; I < 5; I++)); do
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if shlock -f "/tmp/agents.lock.$$" -p "$$"; then
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return 0
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else
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sleep 0.1
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fi
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done
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[[ "${_GOT_LOCK:-0}" == "0" ]] && echo "$(tput setaf 1 || tput AF 1)Failed to obtain lockfile!$(tput op)"
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else
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echo "$(tput setaf 1 || tput AF 1)File locking unsupported - skipping update of agents file!$(tput op)"
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fi
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return 1
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}
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_pop_agent_sock() {
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local I IFS=$'\n' REPLY SOCKS=()
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# Read the current list of auth sockets.
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if ((${BASH_VERSINFO[0]} >= 4)); then
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mapfile -t SOCKS <~/.ssh/agents
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else
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while read -r; do
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SOCKS+=("$REPLY")
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done <~/.ssh/agents
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fi
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# Remove the last instance of the socket in $SSH_AUTH_SOCK.
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for ((I = (${#SOCKS[@]} - 1); I >= 0; I--)); do
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[[ "${SOCKS[$I]}" == "$SSH_AUTH_SOCK" ]] && {
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unset SOCKS[$I]
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break
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}
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done
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# Clean up any dead sockets - this modifies the SOCKS array.
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_clean_agent_socks
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# Write the new list back to disk.
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printf "%s\n" "${SOCKS[@]}" >~/.ssh/agents
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return $?
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}
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_push_agent_sock() {
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local IFS=$'\n' REPLY SOCKS=()
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# Read the current list of auth sockets.
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if ((${BASH_VERSINFO[0]} >= 4)); then
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mapfile -t SOCKS <~/.ssh/agents
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else
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while read -r; do
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SOCKS+=("$REPLY")
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done <~/.ssh/agents
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fi
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# Clean up any dead sockets - this modifies the SOCKS array.
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_clean_agent_socks
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# Write the new list back to disk.
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printf "%s\n" "${SOCKS[@]}" "$SSH_AUTH_SOCK" >~/.ssh/agents
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return $?
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}
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_unlock_agents_file() {
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# Unlock the ~/.ssh/agents file.
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if [[ "$_PLATFORM" == "Linux" ]]; then
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exec 9>&-
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elif [[ "$_PLATFORM" == "Darwin" ]]; then
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rm -f "/tmp/agents.lock.$$"
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fi
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}
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# Make bash a little more pleasent - these are valid for all versions.
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shopt -s cdspell checkhash checkwinsize cmdhist histappend no_empty_cmd_completion
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# Exit the shell on a Ctl+D.
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IGNOREEOF=0
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# History control.
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HISTCONTROL="ignoredups"
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HISTFILESIZE=100000
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HISTIGNORE="w:bg:bg *:fg:fg *:jobs:exit:pwd:clear:history"
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HISTSIZE=-1
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HISTTIMEFORMAT="%d/%m/%y %H:%M:%S "
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history -r
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# Determine the colour of the username in the prompt.
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if (( $(id -u) == 0 )); then
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_COLOUR=1 # Red
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else
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_COLOUR=2 # Green
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fi
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# Version specific set up.
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if (( ${BASH_VERSINFO[0]} >= 4 )); then
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# Add to the shopts.
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shopt -s checkjobs dirspell
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# Set the prompts.
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PROMPT_DIRTRIM=2
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# No colour:
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# PS1="[\u@\h] \w ->"
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# Coloured username:
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# PS1="[\[$(tput bold)$(tput setaf $_COLOUR)\]\u\[$(tput sgr0)\]@\h] \w ->"
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# Coloured username + host:
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# PS1="[\[$(tput bold)$(tput setaf $_COLOUR)\]\u\[$(tput sgr0)\]@\[$(tput bold)$(tput setaf 3)\]\h\[$(tput sgr0)\]] \w ->"
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# Coloured username + host + directory:
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PS1="[\[$(tput bold)$(tput setaf $_COLOUR)\]\u\[$(tput sgr0)\]@\[$(tput bold)$(tput setaf 3)\]\h\[$(tput sgr0)\]] \[$(tput bold)$(tput setaf 4)\]\w\[$(tput sgr0)\] ->"
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else
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# Set the prompts.
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# No colour:
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# PS1="[\u@\h] \$(echo \"\${PWD/#\$HOME/~}\" | awk -F/ '{if (NF>3) {printf \".../\" \$(NF-1) \"/\" \$NF} else {printf \$0}}') ->"
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# Coloured username:
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# PS1="[\[$(tput bold)$(tput setaf $_COLOUR)\]\u\[$(tput sgr0)\]@\h] \$(echo \"\${PWD/#\$HOME/~}\" | awk -F/ '{if (NF>3) {printf \".../\" \$(NF-1) \"/\" \$NF} else {printf \$0}}') ->"
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# Coloured username + host:
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# PS1="[\[$(tput bold)$(tput setaf $_COLOUR)\]\u\[$(tput sgr0)\]@\[$(tput bold)$(tput setaf 3)\]\h\[$(tput sgr0)\]] \$(echo \"\${PWD/#\$HOME/~}\" | awk -F/ '{if (NF>3) {printf \".../\" \$(NF-1) \"/\" \$NF} else {printf \$0}}') ->"
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# Coloured username + host + directory:
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PS1="[\[$(tput bold)$(tput setaf $_COLOUR)\]\u\[$(tput sgr0)\]@\[$(tput bold)$(tput setaf 3)\]\h\[$(tput sgr0)\]] \[$(tput bold)$(tput setaf 4)\]\$(echo \"\${PWD/#\$HOME/~}\" | awk -F/ '{if (NF>3) {printf \".../\" \$(NF-1) \"/\" \$NF} else {printf \$0}}')\[$(tput sgr0)\] ->"
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fi
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unset _COLOUR
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# Set the debugger prompt.
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# PS4="+(\\\$? = \$?) \${BASH_SOURCE##*/}\${FUNCNAME:+(\$FUNCNAME)}:\$LINENO: "
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PS4="+(\[\e[33m\]\\\$? = \$?\[$(tput sgr0)\]) \[$(tput bold)$(tput setaf 4)\]\${BASH_SOURCE##*/}\[$(tput sgr0)\]\${FUNCNAME:+(\[$(tput bold)$(tput setaf 2)\]\$FUNCNAME\[$(tput sgr0)\])}:\[$(tput bold)$(tput setaf 1)\]\$LINENO\[$(tput sgr0)\]: "
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# The commands to execute before the prompt is displayed.
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PROMPT_COMMAND="_agent_prompt_command"
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# Platform specific set up.
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_PLATFORM="$(uname -s)"
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if [[ "$_PLATFORM" = "Linux" ]]; then
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# Linux specific aliases.
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hash ftpwho >/dev/null 2>&1 && alias ftpwho='ftpwho -v'
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hash iftop >/dev/null 2>&1 && alias iftop='TERM=vt100 iftop'
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hash last less >/dev/null 2>&1 && alias laston='last -a | less'
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hash ls >/dev/null 2>&1 && alias ls='ls -bFv --color=auto'
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hash minicom >/dev/null 2>&1 && alias minicom='minicom -m -c on'
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hash mkpasswd >/dev/null 2>&1 && alias pwgen='mkpasswd -m sha512crypt'
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hash pine >/dev/null 2>&1 && alias pine='pine -p "{mail.open-source.co.uk/Service=IMAP/User=darren@afterdark.org.uk/TLS/NoValidate-Cert/NoRsh}.pinerc"'
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hash pinfo >/dev/null 2>&1 && alias info='pinfo'
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hash ping >/dev/null 2>&1 && alias ping='ping -b'
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# Linux specific functions.
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psgrep() {
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ps -auwwx | egrep "(RSS|$1)"
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}
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elif [[ "$_PLATFORM" = "Darwin" ]]; then
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# Darwin specific aliases.
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hash df >/dev/null 2>&1 && alias df='df -P'
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hash ls >/dev/null 2>&1 && alias ls='ls -bFG'
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hash top >/dev/null 2>&1 && alias top='top -o cpu -S'
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else
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echo "${BASH_SOURCE##*/}: unsupported platform: $_PLATFORM" >&2
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fi
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unset _PLATFORM
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# Common aliases.
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hash bc >/dev/null 2>&1 && alias bc='bc -lq'
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hash curl >/dev/null 2>&1 && alias pastebin="curl -F 'sprunge=<-' http://sprunge.us"
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hash diff >/dev/null 2>&1 && alias diff='diff -u'
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hash egrep >/dev/null 2>&1 && alias egrep='egrep --color=auto'
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hash fgrep >/dev/null 2>&1 && alias fgrep='fgrep --color=auto'
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hash grep >/dev/null 2>&1 && alias grep='grep --color=auto'
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hash screen >/dev/null 2>&1 && alias screen='screen -Ua'
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