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+# Fetch a remote TLS certificate: |
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+function tlscertget {
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+ local domain="${1}"
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+ shift |
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+ openssl s_client \ |
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+ -connect "${domain}" \
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+ -servername "${domain}" \
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+ "$@" < /dev/null 2> /dev/null |\ |
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+ sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' |
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+} |
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+ |
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+# Show (in text form) a certificate passed through stdin; display |
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+# full details (-text) if invoked without any argument. See man x509 for |
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+# possible options. |
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+function tlscertshow {
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+ if [ $# -eq 0 ]; then |
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+ openssl x509 -noout -text |
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+ else |
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+ openssl x509 -noout "$@" |
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+ fi |
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+} |
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+ |
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+# Fetch a remote TLS certificate and display its subject, issuer and dates. |
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+function tlscertcheck {
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+ local domain="${1}"
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+ shift |
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+ tlscertget "${domain}" | tlscertshow -subject -issuer -dates "$@"
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+} |
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+# Declare and fill an associative array providing ANSI colors enclosed between |
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+# \[ and \], as per the "PROMPTING" section of man bash: |
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+function declare_colors {
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+ local ci cj cn |
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+ declare -g -A c |
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+ c['normal']='\[\e[0m\]' |
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+ for cn in {,bright_}{black,red,green,yellow,blue,magenta,cyan,white}; do
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+ c["${cn}"]='\[\e['"${ci:=0};${cj:=30}"'m\]'
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+ ((++cj,(cj==38)?(cj=30,++ci):1)) |
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+ done |
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+} |
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+ |
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+# Generate the PS1 variable; doing that in a function allows to reflect almost |
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+# anything in the prompt. |
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+function generate_ps1 {
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+ # Save the return code value (rcv) |
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+ local rcv=$? |
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+ |
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+ # Color for brackets and braces |
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+ local bc="${c['red']}"
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+ |
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+ # Pick the return code color (rcc) |
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+ local rcc='bright_green' |
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+ [ $rcv -ne 0 ] && rcc='bright_red' |
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+ |
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+ local rc dstamp tstamp user host cwdir es |
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+ printf -v rc "%s[%s${rcv}%s]" "${bc}" "${c[${rcc}]}" "${bc}"
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+ printf -v tstamp '[%s\\t%s]' "${c['bright_yellow']}" "${bc}"
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+ printf -v user '[%s\\u%s]' "${c['cyan']}" "${bc}"
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+ printf -v host '{%s\\h%s}' "${c['cyan']}" "${bc}"
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+ printf -v cwdir '%s\w%s ' "${c['green']}" "${c['normal']}"
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+ printf -v es '%s\$%s ' "${c['red']}" "${c['normal']}"
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+ |
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+ if [ "${PS1_DISPLAY_DATE}" ]; then
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+ printf -v dstamp '[%s\\D{%%F}%s]' "${c['bright_yellow']}" "${bc}"
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+ fi |
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+ |
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+ PS1="${rc}${dstamp}${tstamp}${user}${host}${cwdir}${es}"
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+ |
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+ # Also set PS2 and PS4: |
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+ PS2="${c['bright_green']}"
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+ PS4="+ ${c['cyan']}[trace]${c['normal']} "
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+ |
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+ # It makes sense to export PS4 (so that e.g. "bash foobar.sh" benefit from |
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+ # it): |
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+ export PS4 |
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+} |
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+ |
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+# Provide a helper function to swiftly enable or disable the date in the |
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+# prompt: |
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+function ps1_toggle_date {
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+ if [ "${PS1_DISPLAY_DATE}" ]; then
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+ unset PS1_DISPLAY_DATE |
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+ else |
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+ PS1_DISPLAY_DATE='yes' |
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+ fi |
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+} |
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+ |
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+# Provide a helper function to swiftly enable or disable colors in the |
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+# prompt: |
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+function ps1_toggle_colors {
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+ if [ "${PS1_USE_COLORS}" ]; then
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+ unset PS1_USE_COLORS c |
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+ else |
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+ declare_colors |
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+ PS1_USE_COLORS='yes' |
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+ fi |
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+} |
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+ |
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+# Provide a helper function to swiftly reduce the prompt to '$ ' -- this is |
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+# useful e.g. for documentation purposes, when one wants to run a few commands |
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+# and copy the whole terminal output without the prompt (which usually reflects |
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+# undesired details such as user and hostname): |
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+function ps1_toggle_prompt {
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+ local min_prompt='\$ ' |
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+ if [ "${PS1}" == "${min_prompt}" ]; then
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+ PROMPT_COMMAND='generate_ps1' |
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+ generate_ps1 |
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+ else |
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+ unset PROMPT_COMMAND |
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+ PS1="${min_prompt}"
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+ fi |
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+} |
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+ |
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+# By default, use colors but do not display the date: |
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+ps1_toggle_colors |
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+#ps1_toggle_date |
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+ |
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+# Instruct bash to regenerate PS1 before printing the prompt: |
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+PROMPT_COMMAND='generate_ps1' |
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+ |
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+# Generate PS1 at least once: |
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+generate_ps1 |
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+#!/bin/bash |
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+# Backup files before the resizing operation: |
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+tar czvf "resize-rrd.backup.$(date '+%s').tar.gz" "$@" |
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+ |
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+for file in "$@"; do |
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+ # Munin always creates 12 RRAs: resize them all: |
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+ for num in $(seq 0 11); do |
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+ # Adding 9 times the amount of rows is the same as multiplying it by 10: |
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+ new_size=$(rrdtool info "${file}" | perl -nle "\$num=${num};" -e 'print $1*9 if /^rra\[$num\].rows = (.+)$/')
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+ # Resizing itself: |
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+ rrdtool 'resize' "${file}" "${num}" 'GROW' "${new_size}" || continue
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+ mv 'resize.rrd' "${file}"
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+ done |
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+done |
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\ No newline at end of file |