dotfiles/.bashrc

362 lines
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Bash

#!/bin/bash - not strictly necessary, but helps nano with syntax highlighting.
__find_ssh_agent_sock() {
# Find an *active* ssh agent socket.
# Returns: 0 = Found an active socket.
# 1 = Did not find a viable socket.
local I
# Search the SSH_AUTH_SOCKS array for a viable socket.
for ((I = 0; I < ${#SSH_AUTH_SOCKS[@]}; I++)); do
[[ "${SSH_AUTH_SOCKS[$I]}" =~ ^[[:blank:]]*$ ]] && continue
SSH_AUTH_SOCK="${SSH_AUTH_SOCKS[$I]}" ssh-add -l >/dev/null 2>&1
(( $? <= 1 )) && {
export SSH_AUTH_SOCK="${SSH_AUTH_SOCKS[$I]}"
return 0
}
unset SSH_AUTH_SOCK
done
return 1
}
__read_ssh_agents() {
# Read all the known ssh agent sockets into an array.
# Returns: 0 = Processed and read the agents file without issue.
# 1 = Error processing/reading the agents file.
local ERR FD I PLATFORM SOCK
[[ ! -e "$HOME/.ssh/agents" ]] && touch "$HOME/.ssh/agents"
# Determine the platform being logged into.
PLATFORM="$(uname -s)"
# Lock the ~/.ssh/agents file.
if [[ "$PLATFORM" == "Linux" ]]; then
# Linux has 'flock', thankfully.
exec {FD}<"$HOME/.ssh/agents" && flock -E 10 -e -w 0.5 "$FD"
ERR=$?
if (( ERR == 10 )); then
printf "\\033[1;31;40m%s\\033[0;39m\\n" "Failed to obtain lock on ~/.ssh/agents." >&2
return 1
elif (( ERR > 0 )); then
printf "\\033[1;31;40m%s\\033[0;39m\\n" "Flock usage error." >&2
return 1
fi
# Make note of the mtime for use in write_ssh_agents.
SSH_AGENTS_MTIME="$(stat --format=%.9Y "$HOME/.ssh/agents")"
elif [[ "$PLATFORM" == "Darwin" ]]; then
# Do locking the sucky way on macOS.
for ((I = 0; I <= 5; I++)); do
if shlock -p "$$" -f "$HOME/.ssh/agents.lock"; then
exec {FD}<"$HOME/.ssh/agents"
# Make note of the mtime for use in write_ssh_agents.
SSH_AGENTS_MTIME="$(stat -f %Fm "$HOME/.ssh/agents")"
ERR=0
break
else
ERR=1
sleep 0.1
fi
done
(( ERR != 0 )) && {
printf "\\033[1;31;40m%s\\033[0;39m\\n" "Failed to obtain lock on ~/.ssh/agents." >&2
return 1
}
else
printf "\\033[1;31;40m%s\\033[0;39m\\n" "File locking unsupported on '$PLATFORM'." >&2
return 1
fi
# Read the socket list (bash v2+ compliant)
while read -u "$FD" -r SOCK; do
[[ -n "$SOCK" ]] && SSH_AUTH_SOCKS+=("$SOCK")
done
ERR=$?
# Close the file descriptor (which on Linux releases the flock too).
exec {FD}<&-
# On Darwin, release the lock on the file.
rm -f "$HOME/.ssh/agents.lock"
# Remove the . in the mtime.
SSH_AGENTS_MTIME="${SSH_AGENTS_MTIME/\.}"
# Error out if the data couldn't be read.
(( ERR != 0 )) && {
printf "\\033[1;31;40m%s\\033[0;39m\\n" "Failed to read ssh-agent socket list." >&2
unset SSH_AUTH_SOCKS SSH_AGENTS_MTIME
return 1
}
return 0
}
__write_ssh_agents() {
# Write all unique ssh agent sockets into the ~/.ssh/agents file.
# Returns: 0 = Processed and wrote the agents file without issue.
# 1 = Error processing/writing the agents file.
# 2 = The SSH_AUTH_SOCKS array may be out of date as the agents file'a mtime has changed.
local FD ERR I J MTIME SOCKS
# Add the current agent socket to the sockets array.
SSH_AUTH_SOCKS=("$SSH_AUTH_SOCK" "${SSH_AUTH_SOCKS[@]}")
# Remove any duplicates from SSH_AUTH_SOCKS.
for ((I = 0; I < ${#SSH_AUTH_SOCKS[@]}; I++)); do
[[ -z "${SSH_AUTH_SOCKS[$I]}" ]] && continue
for ((J = 0; J < ${#SOCKS[@]}; J++)); do
[[ "${SSH_AUTH_SOCKS[$I]}" == "${SOCKS[$J]}" ]] && continue 2
done
# Only add the socket if it's still viable.
SSH_AUTH_SOCK="${SSH_AUTH_SOCKS[$I]}" ssh-add -l >/dev/null 2>&1
(( $? <= 1 )) && SOCKS+=("${SSH_AUTH_SOCKS[$I]}")
done
# Determine the platform being logged into.
PLATFORM="$(uname -s)"
# Lock the ~/.ssh/agents file.
if [[ "$PLATFORM" == "Linux" ]]; then
# Make sure SSH_AUTH_SOCKS has the most up to date data.
MTIME="$(stat --format=%.9Y "$HOME/.ssh/agents")"
(( ${MTIME/\.} > SSH_AGENTS_MTIME )) && return 2
# Lock the agents file.
exec {FD}<"$HOME/.ssh/agents" && flock -E 10 -e -w 0.5 "$FD"
ERR=$?
if (( ERR == 10 )); then
printf "\\033[1;31;40m%s\\033[0;39m\\n" "Failed to obtain lock on ~/.ssh/agents." >&2
return 1
elif (( ERR > 0 )); then
printf "\\033[1;31;40m%s\\033[0;39m\\n" "Flock usage error." >&2
return 1
fi
elif [[ "$(uname -s)" == "Darwin" ]]; then
# Make sure SSH_AUTH_SOCKS has the most up to date data.
MTIME="$(stat --format=%.9Y "$HOME/.ssh/agents")"
(( ${MTIME/\.} > SSH_AGENTS_MTIME )) && return 2
# Do locking the sucky way on OSX.
for ((I = 0; I <= 5; I++)); do
if shlock -p "$$" -f "$HOME/.ssh/agents.lock"; then
exec {FD}<"$HOME/.ssh/agents"
ERR=0
break
else
ERR=1
sleep 0.1
fi
done
(( ERR != 0 )) && {
printf "\\033[1;31;40m%s\\033[0;39m\\n" "Failed to obtain lock on ~/.ssh/agents." >&2
return 1
}
else
printf "\\033[1;31;40m%s\\033[0;39m\\n" "File locking unsupported on '$PLATFORM'." >&2
return 1
fi
# Write the cleaned array to disk.
ERR=-1
[[ -n "${SOCKS[*]}" ]] && { printf "%s\\n" "${SOCKS[@]}" >"$HOME/.ssh/agents" 2>/dev/null; ERR=$?; }
# Release locks.
exec {FD}>&-
rm -f "$HOME/.ssh/agents.lock"
# Error out if the data couldn't be written.
if (( ERR == -1 )); then
rm -f "$HOME/.ssh/agents" 2>/dev/null
elif (( ERR >= 1 )); then
rm -f "$HOME/.ssh/agents" 2>/dev/null
printf "\\033[1;31;40m%s\\033[0;39m\\n" "Failed to write ssh-agent socket list." >&2
return 1
fi
return 0
}
__ssh_agent_prompt_command() {
# If necessary, find and activate a new ssh agent socket before each prompt is displayed.
# Returns: 0 = All is good.
# 1 = An error occured.
local ERR
if [[ -z "$SSH_AUTH_SOCK" ]]; then
ERR=2
else
ssh-add -l >/dev/null 2>&1
ERR=$?
fi
(( ERR == 2 )) && {
# Read alternative sockets from ~/.ssh/agents.
__read_ssh_agents || {
unset SSH_AUTH_SOCK
return 1
}
# Find a new socket to use.
if __find_ssh_agent_sock; then
printf "\\033[1;33;40m%s\\033[0;39m\\n" "Connected to existing ssh-agent socket."
else
# Start a new agent.
eval "$(ssh-agent -s 2>/dev/null | grep -v 'echo'; printf "%s" "ERR=${PIPESTATUS[0]}")"
(( ERR > 0 )) && {
printf "\\033[1;31;40m%s\\033[0;39m\\n" "Failed to start new ssh-agent - continuing with no agent."
return 1
}
printf "\\033[1;32;40m%s\\033[0;39m\\n" "Started new ssh-agent."
fi
}
return 0
}
imagebin() {
[[ -z "$1" ]] && {
printf "%s: %s\\n" "Usage" "${FUNCNAME[0]} <filename>" >&2
return 1
}
curl -F file="@$1" https://imagebin.ca/upload.php | grep '^url:' | cut -d: -f2-
}
# Make bash a little more pleasent - these are valid for all versions.
shopt -s cdspell checkhash checkwinsize cmdhist histappend no_empty_cmd_completion
# Exit the shell on a Ctl+D.
IGNOREEOF=0
# History control.
HISTCONTROL="ignoredups"
HISTFILE="$HOME/.bash_history-${HOSTNAME%%.*}"
HISTFILESIZE=1000000
HISTIGNORE="bg:bg *:fg:fg *:jobs:exit:clear:history"
HISTSIZE=-1
HISTTIMEFORMAT="%d/%m/%y %H:%M:%S "
history -r
# Determine the colour of the username in the prompt.
if [[ "$LOGNAME" == "root" ]]; then
COLOUR=1 # Red
elif [[ "$LOGNAME" == "tadgy" ]]; then
COLOUR=2 # Green
else
COLOUR=5 # Purple
fi
# Version specific set up.
if (( BASH_VERSINFO[0] >= 4 )); then
# Add to the shopts.
shopt -s checkjobs dirspell
# Trim the path in the prompt.
PROMPT_DIRTRIM=2
# Coloured username + host + directory:
PS1="[\[$(tput bold)$(tput setaf "$COLOUR")\]\u\[$(tput sgr0)\]@\[$(tput bold)$(tput setaf 3)\]\h\[$(tput sgr0)\]] \[$(tput bold)$(tput setaf 4)\]\w\[$(tput sgr0)\] ->"
else
# Set the prompts.
# Coloured username + host + directory:
# shellcheck disable=SC2154
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}}')\[$(tput sgr0)\] ->"
fi
unset COLOUR
# Set the debugger prompt.
# shellcheck disable=SC2155
export PS4="+(\[\e[1;33;40m\]\$?\[$(tput sgr0)\]) \[$(tput bold)$(tput setaf 4)\]\${BASH_SOURCE##*/}\[$(tput sgr0)\]\${FUNCNAME[0]:+(\[$(tput bold)$(tput setaf 2)\]\${FUNCNAME[0]}\[$(tput sgr0)\])}:\[$(tput bold)$(tput setaf 1)\]\$LINENO\[$(tput sgr0)\]: "
# The commands to execute before the prompt is displayed.
PROMPT_COMMAND="__ssh_agent_prompt_command"
# Common aliases.
hash bc >/dev/null 2>&1 && alias bc='bc -lq'
hash diff >/dev/null 2>&1 && alias diff='diff --color=auto -u'
hash gpg2 >/dev/null 2>&1 && {
alias gpg='command gpg2'
alias gpg2='gpg2 --pinentry-mode=loopback'
}
hash grep >/dev/null 2>&1 && {
alias egrep='grep -E --color=auto'
alias fgrep='grep -F --color=auto'
alias grep='grep --color=auto'
}
hash nc >/dev/null 2>&1 && alias pastebin='nc termbin.com 9999'
# Auto start the ssh agent and add keys for scp/sftp/ssh.
hash scp ssh ssh-add >/dev/null 2>&1 && alias scp='_EXEC=scp ssh'
hash sftp ssh ssh-add >/dev/null 2>&1 && alias sftp='_EXEC=sftp ssh'
hash ssh ssh-add >/dev/null 2>&1 && ssh() {
local ERR
if [[ -z "$SSH_AUTH_SOCK" ]]; then
ERR=2
else
ssh-add -l >/dev/null 2>&1
ERR=$?
fi
if (( ERR == 1 )); then
ssh-add
elif (( ERR == 2 )); then
__ssh_agent_prompt_command
ssh-add
fi
command "${_EXEC:-${FUNCNAME[0]}}" "$@"
}
# Determine the platform being logged into.
PLATFORM="$(uname -s)"
# Platform specific set up.
if [[ "$PLATFORM" = "Linux" ]]; then
# Linux specific functions.
hash nano >/dev/null 2>&1 && nano() {
# shellcheck disable=SC2155
local NANO_VER="$(command nano --version | awk '/version/ { print $4 }' | cut -d. -f1)"
if [[ -f "$HOME/.nanorc-$NANO_VER" ]]; then
command nano -f "$HOME/.nanorc-$NANO_VER" "$@"
else
printf "%s: %s\\n" "${FUNCNAME[0]}" "no .nanorc for version '$NANO_VER'" >&2
return 1
fi
}
hash ps grep >/dev/null 2>&1 && psgrep() {
if [[ -n "$1" ]]; then
# shellcheck disable=SC2009
ps -auwwx | grep -E --color=always -- "(.*RSS.*|$1)" | grep -F -v '(.*RSS.*|'
else
printf "%s: %s\\n" "Usage" "${FUNCNAME[0]} <something>" >&2
return 1
fi
}
# Linux specific aliases.
hash ftpwho >/dev/null 2>&1 && alias ftpwho='ftpwho -v'
hash iftop >/dev/null 2>&1 && alias iftop='TERM=vt100 iftop'
hash iotop >/dev/null 2>&1 && alias iotop='TERM=linux iotop'
hash ip >/dev/null 2>&1 && alias ip='ip -color=auto'
hash last less >/dev/null 2>&1 && alias laston='last -a | less'
hash ls >/dev/null 2>&1 && alias ls='ls -bFv --color=auto'
hash minicom >/dev/null 2>&1 && alias minicom='minicom -m -c on'
hash mkpasswd >/dev/null 2>&1 && alias mkpasswd='mkpasswd -m sha512crypt'
hash mkpasswd >/dev/null 2>&1 && alias pwgen='mkpasswd -m sha512crypt'
hash pinfo >/dev/null 2>&1 && alias info='pinfo'
hash ping >/dev/null 2>&1 && alias ping='ping -b'
elif [[ "$PLATFORM" = "Darwin" ]]; then
# Create .nanorc symlink if necessary.
[[ ! -e "$HOME/.nanorc" ]] && {
NANO_VER="$(command nano --version | awk '/version/ { print $4 }' | cut -d. -f1)"
if [[ -f "$HOME/.nanorc-$NANO_VER" ]]; then
( cd "$HOME" && ln -sf ".nanorc-$NANO_VER" .nanorc ) || printf "%s: %s\\n" "${BASH_SOURCE##*/}" "failed to create .nanorc symlink" >&2
else
printf "%s: %s\\n" "${BASH_SOURCE##*/}" "no .nanorc for version '$NANO_VER'" >&2
fi
}
# Darwin specific aliases.
hash df >/dev/null 2>&1 && alias df='df -P'
hash ls >/dev/null 2>&1 && alias ls='ls -bFG'
hash top >/dev/null 2>&1 && alias top='top -o cpu -S'
else
echo "${BASH_SOURCE##*/}: unsupported platform: $PLATFORM" >&2
fi
unset PLATFORM