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Merge pull request #133 from vrtdev/feature/entrypoint
feat: add support for custom scripts in /docker-entrypoint.d and run custom scripts in order
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,19 +1,117 @@ | ||
| #!/bin/bash | ||
| # bash is required to pass ENV vars with dots as sh cannot | ||
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| set -e | ||
| set -o errexit # exit on any command failure; use `whatever || true` to accept failures | ||
| # use `if something; then` instead of `something; if [ $? -eq 0 ]; then` | ||
| # use `rv=0; something || rv=$?` if you really need the exact exit code | ||
| set -o pipefail # pipes fail when any command fails, not just the last one. Use: ( whatever || true ) | somethingelse | ||
| set -o nounset # exit on use of undeclared var, use `${possibly_undefined-}` to substitute the empty string in that case | ||
| # You can assign default values like this: | ||
| # `: ${possibly_undefined=default}` | ||
| # `: ${possibly_undefined_or_empty:=default}` will also replace an empty (but declared) value | ||
| # set -o xtrace | ||
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| for f in /docker-entrypoint.d/*.sh; do | ||
| pid=0 | ||
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| echoerr() { echo "$@" 1>&2; } | ||
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| echoerr "Entrypoint PID $$" | ||
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| ## Pre execution handler | ||
| pre_execution_handler() { | ||
| for f in /docker-entrypoint.d/*.sh; do | ||
| echo "Running $f" | ||
| "$f" | ||
| done | ||
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| if [ -d /docker-custom-entrypoint.d/ ]; then | ||
| done | ||
| if [ -d /docker-custom-entrypoint.d/ ]; then | ||
| find /docker-custom-entrypoint.d/ -type f -name "*.sh" \ | ||
| -exec chmod +x {} \; | ||
| -exec chmod +x {} \; | ||
| sync | ||
| find /docker-custom-entrypoint.d/ -type f -name "*.sh" \ | ||
| -exec echo Running {} \; -exec {} \; | ||
| fi | ||
| for f in /docker-custom-entrypoint.d/*.sh; do | ||
| echo "Running $f" | ||
| "$f" | ||
| done | ||
| fi | ||
| } | ||
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| ## Post startup handler | ||
| post_startup_handler() { | ||
| if [ -d /docker-custom-entrypoint.d/ ]; then | ||
| if [ -d /docker-custom-entrypoint.d/post-startup/ ]; then | ||
| find /docker-custom-entrypoint.d/post-startup/ -type f -name "*.sh" \ | ||
| -exec chmod +x {} \; | ||
| sync | ||
| for f in /docker-custom-entrypoint.d/post-startup/*.sh; do | ||
| echo "Running $f" | ||
| "$f" | ||
| done | ||
| fi | ||
| fi | ||
| } | ||
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| ## Post execution handler | ||
| post_execution_handler() { | ||
| if [ -d /docker-custom-entrypoint.d/ ]; then | ||
| if [ -d /docker-custom-entrypoint.d/post-execution/ ]; then | ||
| find /docker-custom-entrypoint.d/post-execution/ -type f -name "*.sh" \ | ||
| -exec chmod +x {} \; | ||
| sync | ||
| for f in /docker-custom-entrypoint.d/post-execution/*.sh; do | ||
| echo "Running $f" | ||
| "$f" | ||
| done | ||
| fi | ||
| fi | ||
| } | ||
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| ## Sigterm Handler | ||
| sigterm_handler() { | ||
| echoerr "Catching SIGTERM" | ||
| if [ $pid -ne 0 ]; then | ||
| echoerr "sigterm_handler for PID '${pid}' triggered" | ||
| # the above if statement is important because it ensures | ||
| # that the application has already started. without it you | ||
| # could attempt cleanup steps if the application failed to | ||
| # start, causing errors. | ||
| if [ -d /docker-custom-entrypoint.d/ ]; then | ||
| if [ -d /docker-custom-entrypoint.d/sigterm-handler/ ]; then | ||
| find /docker-custom-entrypoint.d/sigterm-handler/ -type f -name "*.sh" \ | ||
| -exec chmod +x {} \; | ||
| sync | ||
| for f in /docker-custom-entrypoint.d/sigterm-handler/*.sh; do | ||
| echo "Running $f" | ||
| "$f" | ||
| done | ||
| fi | ||
| fi | ||
| kill -15 "$pid" | ||
| wait "$pid" | ||
| post_execution_handler | ||
| fi | ||
| exit 143; # 128 + 15 -- SIGTERM | ||
| } | ||
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| ## Setup signal trap | ||
| # on callback execute the specified handler | ||
| trap sigterm_handler SIGTERM | ||
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| ## Initialization | ||
| pre_execution_handler | ||
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| ## Start Process | ||
| echoerr "Starting Puppetserver" | ||
| # run process in background and record PID | ||
| /opt/puppetlabs/bin/puppetserver "$@" & | ||
| pid="$!" | ||
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| ## Post Startup | ||
| post_startup_handler | ||
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| ## Wait forever until app dies | ||
| wait "$pid" | ||
| return_code="$?" | ||
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| exec /opt/puppetlabs/bin/puppetserver "$@" | ||
| ## Cleanup | ||
| post_execution_handler | ||
| # echo the return code of the application | ||
| exit $return_code |