scheduled_merge.sh

#!/bin/bash

GITLAB_TOKEN="$(cat .token)"
[ "$GITLAB_TOKEN" = "" ] && echo "please create .token file and fill it with your GitLab access token" && exit 1

#[ ! "${BASH_VERSINFO[0]}" -ge 4 ] && echo "you need bash version 4 or greater in order to run this script" && exit 1

[ ! "$#" -eq 4 ] && echo "usage: ./script.sh <repoID> <mrID> <dd-mm-yyyy> <HH:MM> (24hr format)" && exit 1

#echo "working with repo $1, MR $2, to be merged at $4 on $3"

repo_info_resp="$(curl --silent --header "PRIVATE-TOKEN: $GITLAB_TOKEN" "https://gitlab.com/api/v4/projects/$1")"
repo_name="$(echo "$repo_info_resp" | jq -r '.name')"
[ "$repo_name" = "null" ] && echo "you must have provided wrong repoID, please check again" && exit 1

mr_info_resp="$(curl --silent --header "PRIVATE-TOKEN: $GITLAB_TOKEN" "https://gitlab.com/api/v4/projects/$1/merge_requests/$2")"
mr_title="$(echo "$mr_info_resp" | jq -r '.title')"
mr_author="$(echo "$mr_info_resp" | jq -r '.author.name')"

echo "it seems we are working on project \"$repo_name\""
echo "with merge request made by $mr_author titled as \"$mr_title\""
echo "to be merged at $4 on $3 (please be sure date formats are correct)"
echo -n "are you absolutely sure you wish to proceed? [N/y]: "
read -r ANS
[ ! "$ANS" = "y" ] && [ ! "$ANS" = "Y" ] && echo "abort" && exit 1

echo
echo "alright then, gonna merge the MR when the time comes ;)"

TARGET_TIMESTAMP="$(date -j -f "%d-%m-%Y %H:%M:%S" "$3 $4:00" "+%s")"
CURRENT_TIMESTAMP=$(date +%s)

[ "$CURRENT_TIMESTAMP" -gt "$TARGET_TIMESTAMP" ] && echo "dumbass, that date time is already in the past" && exit 1

DIFFERENCE=$((TARGET_TIMESTAMP - CURRENT_TIMESTAMP))

DAYS=$((DIFFERENCE / 86400))
HOURS=$(( (DIFFERENCE % 86400) / 3600 ))
MINUTES=$(( (DIFFERENCE % 3600) / 60 ))
SECONDS=$((DIFFERENCE % 60))

echo "execution in $DAYS days, $HOURS hours, $MINUTES minutes, and $SECONDS seconds"
sleep $DIFFERENCE
echo "time for action!"

merged_at="$(curl --silent --header "PRIVATE-TOKEN: $GITLAB_TOKEN" "https://gitlab.com/api/v4/projects/$1/merge_requests/$2/merge" --request PUT | jq -r '.merged_at')"
if [ "$merged_at" = "null" ]; then
	echo "something went wrong whilst trying to merge the request"
	repeat 10 afplay failure.mp4
else
	echo "successfully merged the request"
fi