vcs-backup.sh
author František Kučera <franta-hg@frantovo.cz>
Fri, 19 Apr 2019 17:52:37 +0200
branchv_0
changeset 3 1c7536a0beda
parent 2 4c9994be0688
child 4 1539711d8657
permissions -rwxr-xr-x
optional callback → local clone
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#!/bin/bash
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# VCS Backup
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# Copyright © 2019 František Kučera (Frantovo.cz, GlobalCode.info)
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# Server-side configuration:
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VCS_BACKUP_DATA_DIR="/mnt/data";
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VCS_BACKUP_CURRENT_DIR="$VCS_BACKUP_DATA_DIR/current";
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VCS_BACKUP_PUBLIC_DIR="$VCS_BACKUP_DATA_DIR/public";
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VCS_BACKUP_CONFIG_DIR="$VCS_BACKUP_DATA_DIR/config";
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VCS_BACKUP_SNAPSHOT_DIR="$VCS_BACKUP_DATA_DIR/snapshot";
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VCS_BACKUP_SUBVOLUME_SOCKET="/run/vcs-backup-subvolume";
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VCS_BACKUP_CLONE_SOCKET="/run/vcs-backup-clone";
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VCS_BACKUP_CLONE_CALLBACK_SOCKET="clone-callback";
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VCS_BACKUP_USER="vcs-backup";
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VCS_BACKUP_MANAGER="vcs-backup-manager";
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# Installation – check and do it by hand:
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# There should be already mounted Btrfs at $VCS_BACKUP_DATA_DIR
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installInstructions() {
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cp vcs-backup.sh /usr/local/bin/
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adduser --disabled-password "$VCS_BACKUP"
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adduser --disabled-password "$VCS_BACKUP_MANAGER"
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mkdir "$VCS_BACKUP_CURRENT_DIR";
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mkdir "$VCS_BACKUP_CONFIG_DIR";
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mkdir "$VCS_BACKUP_SNAPSHOT_DIR";
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chown "${VCS_BACKUP_USER}:${VCS_BACKUP_USER}" "$VCS_BACKUP_CURRENT_DIR"
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chown "${VCS_BACKUP_MANAGER}:${VCS_BACKUP_MANAGER}" "$VCS_BACKUP_CONFIG_DIR"
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}
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# --- Private functions: ---------------------------------------------------------------------------
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# Environment: all
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# $1 = VCS type: hg, git
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# $2 = URL
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isValidTypeAndURL() { ([[ "$1" == "hg" || "$1" == "git" ]]) && [[ $(echo "$2" | wc -l) == 1 ]] && [[ $(echo "$2" | grep -E '^(http|https|ssh)://([a-zA-Z0-9_-][a-zA-Z0-9_-.]*/?)+$' | wc -l) == 1 ]]; }
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# Environment: all
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# $1 = path to the config file
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loadConfigFile() { if [ -f "$1" ]; then . "$1"; else echo "Missing config file: $1" >&2; exit 1; fi }
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# Environment: server
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# $1 = URL
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urlToRelativeDirectoryPath() {
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	echo "$1" | sed -E 's@^[^:]+://@@g';
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}
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# --- Public interface functions: ------------------------------------------------------------------
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# Environment: client
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# $1 = VCS type: hg, git
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# $2 = URL
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# $3 = "public" or "private" (default), whether the repository should be available through the public web interface
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vcs_backup_public_clientSubmitBackupRequest() {
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	if isValidTypeAndURL "$1" "$2"; then
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		loadConfigFile ~/.config/vcs-backup/client.cfg
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		${VCS_BACKUP_SSH_COMMAND[@]} vcs-backup.sh serverSubmitBackupRequest "$1" "$2" "$3" "$4"
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		if [[ "$4" == "clone" ]]; then
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			if   [[ "$1" == "hg"  ]]; then  hg clone "ssh://${VCS_BACKUP_SERVER}//mnt/data/current/$1/$(urlToRelativeDirectoryPath $2)";
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			elif [[ "$1" == "git" ]]; then git clone "ssh://${VCS_BACKUP_SERVER}//mnt/data/current/$1/$(urlToRelativeDirectoryPath $2)";
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			fi
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		fi
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	else
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		echo "Unsupported VCS type: '$1' or URL: '$2'" >&2;
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	fi
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}
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# Environment: server
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# has same parameters as clientSubmitBackupRequest (see above)
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vcs_backup_public_serverSubmitBackupRequest() {
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	if isValidTypeAndURL "$1" "$2"; then
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		loadConfigFile "/etc/vcs-backup/server.cfg";
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		relativePath=$1/$(urlToRelativeDirectoryPath "$2");
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		absolutePath="$VCS_BACKUP_CONFIG_DIR/$relativePath";
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		mkdir -p "$absolutePath";
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		echo "$2" > "$absolutePath/url.txt"
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		echo "submited" > "$absolutePath/state.txt"
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		setfacl -m u:${VCS_BACKUP_USER}:r  "$absolutePath/url.txt"
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		setfacl -m u:${VCS_BACKUP_USER}:rw "$absolutePath/state.txt"
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		echo "$relativePath" | socat -u - unix-send:${VCS_BACKUP_SUBVOLUME_SOCKET};
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		if [[ "$3" == "public" ]]; then
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			cd "$VCS_BACKUP_PUBLIC_DIR";
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			mkdir -p "$(dirname $relativePath)";
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			ln -rs "../current/$relativePath" "$(dirname $relativePath)";
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		fi
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		if [[ "$4" == "clone" ]]; then
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			socat -u "unix-recvfrom:$absolutePath/${VCS_BACKUP_CLONE_CALLBACK_SOCKET},mode=777" - | while read m; do # TODO: ,group=${VCS_BACKUP_USER} and no 777
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				echo "Message from the clone service: $m";
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			done;
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		fi
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	else
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		echo "Unsupported VCS type: '$1' or URL: '$2'" >&2;
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	fi
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}
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# Environment: server
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# Should be started as a systemd/init service.
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# - reads messages from from the subvolume socket – message contains the relative directory path
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# - creates a subvolume for given repository + necesary parent directories
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# - sends a message to the clone service → start cloning into the created subvolume
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vcs_backup_public_serverStartSubvolumeService() {
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	socat -u "unix-recv:${VCS_BACKUP_SUBVOLUME_SOCKET},group=${VCS_BACKUP_MANAGER},mode=770" - | while read d; do
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		mkdir -p $(dirname "$VCS_BACKUP_CURRENT_DIR/$d");
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		btrfs subvolume create "$VCS_BACKUP_CURRENT_DIR/$d" && \
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		echo "subvolumeCreated" > "$VCS_BACKUP_CONFIG_DIR/$d/state.txt" && \
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		chown "${VCS_BACKUP_USER}:${VCS_BACKUP_USER}" "$VCS_BACKUP_CURRENT_DIR/$d" && \
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		echo "$d" | socat -u - unix-send:${VCS_BACKUP_CLONE_SOCKET};
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	done
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}
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# Environment: server
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# should be started as a systemd/init service
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vcs_backup_public_serverStartCloneService() {
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	socat -u "unix-recv:${VCS_BACKUP_CLONE_SOCKET},mode=700" - | while read d; do
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		vcsType=$(echo "$d" | sed 's@/.*@@g');
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		url=$(cat "$VCS_BACKUP_CONFIG_DIR/$d/url.txt");
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		if isValidTypeAndURL "$vcsType" "$url"; then
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			if   [[ "$vcsType" == "hg"  ]]; then  hg clone -U     "$url" "$VCS_BACKUP_CURRENT_DIR/$d";
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			elif [[ "$vcsType" == "git" ]]; then git clone --bare "$url" "$VCS_BACKUP_CURRENT_DIR/$d";
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			fi && echo "cloned" > "$VCS_BACKUP_CONFIG_DIR/$d/state.txt";
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		else
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			echo "Unsupported VCS type: '$vcsType' or URL: '$url'" >&2;
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		fi
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		callBackSocket="$VCS_BACKUP_CONFIG_DIR/$d/$VCS_BACKUP_CLONE_CALLBACK_SOCKET";
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		if [[ -e "$callBackSocket" ]]; then
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			echo "done" | socat -u - unix-send:"$callBackSocket";
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		fi
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	done
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}
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# --- Single entry-point: --------------------------------------------------------------------------
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PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin";
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PUBLIC_FUNCTION_PREFIX="vcs_backup_public_";
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if type -t "$PUBLIC_FUNCTION_PREFIX$1" > /dev/null; then
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	"$PUBLIC_FUNCTION_PREFIX${@:1}";
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else
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	echo "Unsupported sub-command: $1" >&2
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	echo "Available sub-commands:" >&2
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	declare -F | grep "$PUBLIC_FUNCTION_PREFIX" | sed "s/.*$PUBLIC_FUNCTION_PREFIX/  /g" >&2
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	exit 1;
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fi