./backup_mysql.sh in Alpine requires `coreutils`

[jcalfee]

Without coreutils:

/var/vmail/backup

bash-5.0# ./backup_mysql.sh 
[...]
++ date '--date=90 days ago' +%Y
date: invalid date '90 days ago'
+ shift_year=
++ date '--date=90 days ago' +%m
date: invalid date '90 days ago'
+ shift_month=
++ date '--date=90 days ago' +%d
date: invalid date '90 days ago'
+ shift_day=
+ export REMOVED_BACKUP_DIR=/var/vmail/backup/mysql///
+ REMOVED_BACKUP_DIR=/var/vmail/backup/mysql///
+ export REMOVED_BACKUP_MONTH_DIR=/var/vmail/backup/mysql//
+ REMOVED_BACKUP_MONTH_DIR=/var/vmail/backup/mysql//
+ export REMOVED_BACKUP_YEAR_DIR=/var/vmail/backup/mysql/
+ REMOVED_BACKUP_YEAR_DIR=/var/vmail/backup/mysql/
+ export LOGFILE=/var/vmail/backup/mysql/2020/12/19/2020-12-19-21-27-11.log
+ LOGFILE=/var/vmail/backup/mysql/2020/12/19/2020-12-19-21-27-11.log
[...]
==> Backup completed successfully.
+ '[' XYES == XYES -a -d /var/vmail/backup/mysql/// ']'
+ echo -e '* Old backup found. Deleting: /var/vmail/backup/mysql///.'
+ rm -rf /var/vmail/backup/mysql///
+ rmdir /var/vmail/backup/mysql//
+ rmdir /var/vmail/backup/mysql/
+ sql_log_msg='INSERT INTO log (event, loglevel, msg, admin, ip, timestamp) VALUES ('\''backup'\'', '\''info'\'', '\''Remove old backup: /var/vmail/backup/mysql///.'\'', '\''cron_backup_sql'\'', '\''127.0.0.1'\'', UTC_TIMESTAMP());'
+ mysql --defaults-file=/root/.my.cnf -uroot iredadmin -e 'INSERT INTO log (event, loglevel, msg, admin, ip, timestamp) VALUES ('\''backup'\'', '\''info'\'', '\''Remove old backup: /var/vmail/backup/mysql///.'\'', '\''cron_backup_sql'\'', '\''127.0.0.1'\'', UTC_TIMESTAMP());'
+ echo '==> Detailed log (/var/vmail/backup/mysql/2020/12/19/2020-12-19-21-27-11.log):'
==> Detailed log (/var/vmail/backup/mysql/2020/12/19/2020-12-19-21-27-11.log):
+ echo =========================
=========================
+ cat /var/vmail/backup/mysql/2020/12/19/2020-12-19-21-27-11.log
cat: can't open '/var/vmail/backup/mysql/2020/12/19/2020-12-19-21-27-11.log': No such file or directory

Added:

# apk add coreutils
fetch http://dl-cdn.alpinelinux.org/alpine/v3.12/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.12/community/x86_64/APKINDEX.tar.gz
(1/3) Installing libacl (2.2.53-r0)
(2/3) Installing libattr (2.4.48-r0)
(3/3) Installing coreutils (8.32-r0)
Executing busybox-1.31.1-r19.trigger
OK: 430 MiB in 267 packages
bash-5.0# date --date='90 day ago' +%y%m%d
200920

With coreutils:

[...]
+ cat /var/vmail/backup/mysql/2020/12/19/2020-12-19-21-37-07.log
* Starting backup: 2020-12-19-21-37-07.
* Backup directory: /var/vmail/backup/mysql/2020/12/19.
* Backing up databases: mysql vmail amavisd iredapd iredadmin roundcubemail sogo sa_bayes.
* File size:
----
12K	amavisd-2020-12-19-21-37-07.sql.bz2
4.0K	iredadmin-2020-12-19-21-37-07.sql.bz2
4.0K	iredapd-2020-12-19-21-37-07.sql.bz2
276K	mysql-2020-12-19-21-37-07.sql.bz2
8.0K	roundcubemail-2020-12-19-21-37-07.sql.bz2
8.0K	sa_bayes-2020-12-19-21-37-07.sql.bz2
4.0K	vmail-2020-12-19-21-37-07.sql.bz2
----
* Backup completed (Success? YES).

[iRedMail]

Thanks for the feedback. Fixed moment ago, nightly build should be available on Docker Hub in minutes. :)