79 lines
2.8 KiB
Bash
Executable File
79 lines
2.8 KiB
Bash
Executable File
#!/bin/bash
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#
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# Backups the configuration files of this docker-composed service.
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# This is a general purpose worker script, doesn't requires customization.
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#
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# Author: Kovács Zoltán <kovacs.zoltan@smartfront.hu>
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# License: GNU/GPL v3+ (https://www.gnu.org/licenses/gpl-3.0.en.html)
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# 2021-09-03 v0.1 Initial release
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# Accepted environment variables and their defaults.
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PAR_BASEDIR=${PAR_BASEDIR:-""} # Service's base folder
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PAR_BACKUPDIR=${PAR_BACKUPDIR:-""} # Folder to dump within
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# Other initialisations.
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BACKUPDIR="storage/backups/tarballs" # Folder to dump within
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USER=${USER:-LOGNAME} # Fix for cron enviroment only
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YMLFILE="docker-compose.yml"
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# Messages.
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MSG_MISSINGDEP="Fatal: missing dependency"
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MSG_MISSINGYML="Fatal: didn't find the docker-compose.yml file"
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MSG_NONWRITE="The target directory isn't writable"
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# Checks the dependencies.
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TR=$(which tr 2>/dev/null)
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if [ -z "$TR" ]; then echo "$MSG_MISSINGDEP tr."; exit 1 ; fi
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for item in date dirname hostname readlink tar
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do
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if [ -n "$(which $item)" ]
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then export $(echo $item | "$TR" '[:lower:]' '[:upper:]' | "$TR" '-' '_')=$(which $item)
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else echo "$MSG_MISSINGDEP $item." >&2; exit 1; fi
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done
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# Where I'm?
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# https://gist.github.com/TheMengzor/968e5ea87e99d9c41782
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SOURCE="$0"
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while [ -h "$SOURCE" ]; do
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# resolve $SOURCE until the file is no longer a symlink
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SCRPATH="$( cd -P "$("$DIRNAME" "$SOURCE" )" && pwd )" #"
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SOURCE="$("$READLINK" "$SOURCE")"
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# if $SOURCE was a relative symlink, we need to resolve it
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# relative to the path where the symlink file was located
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[[ $SOURCE != /* ]] && SOURCE="$SCRPATH/$SOURCE"
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done; SCRPATH="$( cd -P "$("$DIRNAME" "$SOURCE" )" && pwd )" #"
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# Searches the base folder, containing a docker-compose.yml file.
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# Called from the base folder (./)?
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BASE_DIR="$PAR_BASEDIR"
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TEST_DIR="$SCRPATH"
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[[ -z "$BASE_DIR" ]] && [[ -r "$TEST_DIR/$YMLFILE" ]] && BASE_DIR="$TEST_DIR"
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# Called from ./tools?
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TEST_DIR="$("$DIRNAME" "$TEST_DIR")"
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[[ -z "$BASE_DIR" ]] && [[ -r "$TEST_DIR/$YMLFILE" ]] && BASE_DIR="$TEST_DIR"
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# Called from ./tools/*.d?
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TEST_DIR="$("$DIRNAME" "$TEST_DIR")"
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[[ -z "$BASE_DIR" ]] && [[ -r "$TEST_DIR/$YMLFILE" ]] && BASE_DIR="$TEST_DIR"
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# On failure gives it up here.
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if [ -z "$BASE_DIR" -o ! -r "$BASE_DIR/$YMLFILE" ]; then
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echo "$MSG_MISSINGYML" >&2; exit 1
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fi
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# Sets the absolute paths.
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BACKUPDIR="${PAR_BACKUPDIR:-$BASE_DIR/$BACKUPDIR}"
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# The dump target folder must be writable.
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[[ ! -w "$BACKUPDIR" ]] \
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&& echo "$MSG_NONWRITE: $BACKUPDIR" >&2 && exit 1
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# Tries the FS backup.
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if [ -w "$BACKUPDIR" ]; then
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BACKUP_NAME="configs.$("$DATE" '+%Y%m%d_%H%M%S').$("$HOSTNAME")"
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( cd "$BASE_DIR"
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"$TAR" czf "$BACKUPDIR/$BACKUP_NAME.tgz" \
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"$YMLFILE" configs docker \
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2>>"$BACKUPDIR/$BACKUP_NAME.log"
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)
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fi
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# That's all, Folks! :)
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