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yadm/contrib/hooks/parsing_full_command_example/pre_log
2020-01-27 07:31:58 -06:00

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#!/bin/bash
# yadm exposes all parameters of the command which triggers a hook. Those
# parameters are exported as the environment variable YADM_HOOK_FULL_COMMAND.
# Any spaces, tabs, or backslashes in those parameters are escaped with a
# backslash. The function `parse_full_command()` is a demonstration of parsing
# those values which may be escaped.
function parse_full_command() {
local delim=$'\x1e' # ASCII Record Separator
local space=$'\x1f' # ASCII Unit Separator
local tab=$'\t' # ASCII TAB
local cmd
cmd="$YADM_HOOK_FULL_COMMAND"
cmd="${cmd//\\ /$space}" # swap escaped spaces for `1f`
cmd="${cmd//\\\\/\\}" # fix escaped backslashes
cmd="${cmd//\\$tab/$tab}" # fix escaped tabs
cmd="${cmd// /$delim}" # convert space delimiters to `1c`
cmd="${cmd//$space/ }" # convert `1f` back to spaces
# parse data into an array
IFS=$delim read -r -a full_cmd <<< "$cmd"
}
parse_full_command
for param in "${full_cmd[@]}"; do
echo "Parameter: '$param'"
done