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mattermost-dl-job.sh
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mattermost-dl-job.sh
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#!/bin/sh
set -o errexit
print_help() {
cat >&2 <<EOF
This script runs mattermost-dl noninteractively, typically from scheduler system
Stays silent on success, calls error report handler sh script (with application's output) on failure
Usage:
$0 <OPTS> [-- <EXTRA_ARGS>]
Options:
--cwd <DIR> Use given current working directory
--conf <CONF> [default: none (inherited from mattermost-dl defaults]
--handler <CMD> [default: printing downloader's output into report file]
Describes handling of case where mattermost-dl failed (produced content on
standard error output). Takes form of line evaluated as sh script,
with following substituable wildcards:
{retcode} - return code of the invocation
{date} - time of invocation in format viable for inclusion in filenames
{stdout} - temporary file containing downloader's standard output
{stderr} - temporary file containing downloader's standard error output
{report} - report file
example:
'cat {stdout} {stderr} >~/mattermost-dl-fail-report-{date}.txt'
--report-file <REPORT>
[default: standard output]
File used for reporting on failed download.
Used as templating parameter of (default) failure handling, being
easier than replacing the entire handler
EOF
}
require_tool() {
if ! which $1 >/dev/null; then
echo "Cannot find required tool '$1' in path." >&2
exit 1
fi
}
require_tool mattermost-dl
require_tool date
require_tool sed
require_tool tr
parse_args() {
CONFIG_PATH="" # Invalid value
REPORT_FILE='&1'
ERR_HANDLER="(printf 'Invocation of mattermost-dl failed with status code {retcode}.\nProgram output:\n===\n'; cat {stdout}; printf '===\nProgram error output:\n===\n'; cat {stderr}) >{report}"
EXTRA_ARGS=""
while [ $# -gt 0 ]; do
case "$1" in
--help)
print_help
exit 0
;;
--cwd)
if [ $# -eq 1 ]; then
echo "Missing argument for '$1'." >&2
print_help
exit 1
fi
cd "$2"
shift
;;
--conf)
if [ $# -eq 1 ]; then
echo "Missing argument for '$1'." >&2
print_help
exit 1
fi
CONFIG_PATH="$2"
shift
;;
--handler)
if [ $# -eq 1 ]; then
echo "Missing argument for '$1'." >&2
print_help
exit 1
fi
ERR_HANDLER="$2"
shift
;;
--report-file)
if [ $# -eq 1 ]; then
echo "Missing argument for '$1'." >&2
print_help
exit 1
fi
REPORT_FILE="$2"
shift
;;
--)
shift
EXTRA_ARGS="$@"
return 0
;;
*)
echo "Unknown argument '$1'." >&2
print_help
exit 1
esac
shift
done
}
parse_args "$@"
get_date_str() {
date --iso-8601=minutes | tr ':' '-'
}
sed_quote() {
sed -e 's/[\\\/&]/\\&/g'
}
TEMP_STDOUT=$(mktemp)
TEMP_STDERR=$(mktemp)
trap "rm -f '$TEMP_STDOUT' '$TEMP_STDERR'" EXIT
RETCODE=0
if [ -z "$CONFIG_PATH" ]; then
mattermost-dl $EXTRA_ARGS >"$TEMP_STDOUT" 2>"$TEMP_STDERR" || RETCODE=$?
else
mattermost-dl --conf "$CONFIG_PATH" $EXTRA_ARGS >"$TEMP_STDOUT" 2>"$TEMP_STDERR" || RETCODE=$?
fi
if [ $RETCODE -gt 0 ]; then
eval "$(printf '%s' "$ERR_HANDLER" \
| sed s/{report}/"$(printf '%s' "$REPORT_FILE" | sed_quote)"/g \
| sed s/{date}/"$(get_date_str)"/g \
| sed s/{retcode}/"$RETCODE"/g \
| sed s/{stdout}/"$(printf '%s' "$TEMP_STDOUT" | sed_quote)"/g \
| sed s/{stderr}/"$(printf '%s' "$TEMP_STDERR" | sed_quote)"/g \
)"
fi
exit $RETCODE