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122 lines
2.3 KiB
122 lines
2.3 KiB
#!/bin/sh
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RETVAL=0
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FDOUT=/dev/stdout
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FDERR=/dev/stderr
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STACK_NAME=
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CT_NAME=
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STCT_SEP=_
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EXEC_TGT=
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EXEC_AS=0
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EXEC_SHELL=/bin/sh
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EXEC_ARGS=
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usage () {
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cat > /dev/stdout <<EOS
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$0: Execute a command within a docker container roughly matching the given name.
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Usage:
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$0 [-u ID][-s SHELL][-S STACK_NAME] NAME_FRAGMENT
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EOS
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}
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_fmtlog () {
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echo "$1: $2"
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}
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_log () {
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echo "$@" >> $FDOUT
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}
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_notice () {
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_fmtlog NOTICE "$1" >> $FDOUT
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}
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_info () {
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_fmtlog INFO "$1" >> $FDOUT
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}
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_warn () {
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_fmtlog WARN "$1" >> $FDERR
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}
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_err () {
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_fmtlog ERR "$1" >> $FDERR
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if [ "$2" = "" ] || [ "$2" = "0" ]; then exit 1
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else exit "$2"; fi
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}
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ctls () {
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docker ps -f 'status=running' -f "name=~*$1*" --format '{{.Names}} ({{.ID}}) - {{.Status}}'
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}
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ctid () {
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docker ps -f 'status=running' -f "name=~*$1*" --format '{{.ID}}'
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}
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ctc () {
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ctid "$1" | wc -l
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}
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argparse () {
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while :; do case $1 in
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-v|--verbose)
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set -x
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;;
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--stack=?*)
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STACK_NAME=${1#*=}
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;;
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-S|--stack)
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STACK_NAME="$2"; shift
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;;
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--shell=?*)
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EXEC_SHELL=${1#*=}
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;;
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-s|--shell)
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EXEC_SHELL="$2"; shift
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;;
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--uid=?*|--user=?*)
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EXEC_AS=${1#*=}
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;;
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-u|--uid|--user)
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EXEC_AS="$2"; shift
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;;
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--name=?*)
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CT_NAME=${1#*=}
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;;
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-n|--name)
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CT_NAME="$2"; shift
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;;
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--)
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shift; break
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;;
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-h|--help)
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usage; exit $RETVAL
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;;
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-?*)
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$0 --help
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_err "Unrecognised option $1" 1
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;;
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*)
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CT_NAME="$1"; shift
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EXEC_ARGS="$*"
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break
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esac; shift; done
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}
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## TODO: try_shell - retry each in a list of possible shells
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## TODO: least_privileged_user - find the least privileged user of a running CT
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argparse "$@"
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if [ "$CT_NAME" = "" ]; then _err "No container name fragment specified!" 1; fi
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if [ "$CT_NAME" != "" ] && [ "$STACK_NAME" = "" ]; then
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EXEC_TGT="$CT_NAME"
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else
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EXEC_TGT="$STACK_NAME$STCT_SEP$CT_NAME"
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fi
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MATCHED_CTS=$(ctc "$EXEC_TGT")
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if [ "$MATCHED_CTS" -lt 1 ]; then _err "No running containers matched '$EXEC_TGT'" 1; fi
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if [ "$MATCHED_CTS" -gt 1 ]; then
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_err "More than one running container matched '$EXEC_TGT', please refine.
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Matched containers:
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$(ctls "$EXEC_TGT")" 1
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fi
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CTID=$(ctid "$EXEC_TGT")
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# Ignore unquoted args, otherwise bad things happen
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# shellcheck disable=SC2086
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docker exec -it -u "$EXEC_AS" "$CTID" "$EXEC_SHELL" $EXEC_ARGS
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echo "Command exited with status $?"
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