bash 仅当文件系统已挂载时才进行 RSync
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原文地址: http://stackoverflow.com/questions/27359/
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RSync only if filesystem is mounted
提问by thelsdj
I want to setup a cron job to rsync a remote system to a backup partition, something like:
我想设置一个 cron 作业来将远程系统同步到备份分区，例如：
bash -c 'rsync -avz --delete --exclude=proc --exclude=sys root@remote1:/ /mnt/remote1/'
I would like to be able to "set it and forget it" but what if /mnt/remote1becomes unmounted? (After a reboot or something) I'd like to error out if /mnt/remote1isn't mounted, rather than filling up the local filesystem.
我希望能够“设置并忘记它”但如果/mnt/remote1被卸载怎么办？（在重新启动或其他事情后）如果/mnt/remote1未安装，我想出错，而不是填满本地文件系统。
Edit:
Here is what I came up with for a script, cleanup improvements appreciated (especially for the empty then ... else, I couldn't leave them empty or bash errors)
编辑：
这是我想出的脚本，感谢清理改进（特别是对于空然后......否则，我不能让它们为空或 bash 错误）
#!/bin/bash
DATA=data
ERROR="0"
if cut -d' ' -f2 /proc/mounts | grep -q "^/mnt/$"; then
ERROR=0
else
if mount /dev/vg/ /mnt/; then
ERROR=0
else
ERROR=$?
echo "Can't backup , /mnt/ could not be mounted: $ERROR"
fi
fi
if [ "$ERROR" = "0" ]; then
if cut -d' ' -f2 /proc/mounts | grep -q "^/mnt//$DATA$"; then
ERROR=0
else
if mount /dev/vg/$DATA /mnt//data; then
ERROR=0
else
ERROR=$?
echo "Can't backup , /mnt//data could not be mounted."
fi
fi
fi
if [ "$ERROR" = "0" ]; then
rsync -aqz --delete --numeric-ids --exclude=proc --exclude=sys \
[email protected]:/ /mnt//
RETVAL=$?
echo "Backup of completed, return value of rsync: $RETVAL"
fi
采纳答案by Ted Percival
if cut -d' ' -f2 /proc/mounts | grep '^/mnt/remote1$' >/dev/null; then
rsync -avz ...
fi
Get the list of mounted partitions from /proc/mounts, only match /mnt/remote1(and if it is mounted, send grep's output to /dev/null), then run your rsyncjob.
从 获取已安装分区的列表/proc/mounts，仅匹配/mnt/remote1（如果已安装，则将 grep 的输出发送到/dev/null），然后运行您的rsync作业。
Recent greps have a -qoption that you can use instead of sending the output to /dev/null.
最近的greps 有一个-q选项，您可以使用它来代替将输出发送到/dev/null.
回答by bob esponja
mountpointseems to be the best solution to this: it returns 0 if a path is a mount point:
mountpoint似乎是最好的解决方案：如果路径是挂载点，则返回 0：
#!/bin/bash
if [[ `mountpoint -q /path` ]]; then
echo "filesystem mounted"
else
echo "filesystem not mounted"
fi
Found at LinuxQuestions.
在LinuxQuestions 中找到。
回答by Harley Holcombe
A quick google led me to this bash script that can check if a filesystem is mounted. It seems that grepping the output of df or mount is the way to go:
一个快速的谷歌让我找到了这个 bash 脚本，它可以检查文件系统是否已安装。似乎 grepping df 或 mount 的输出是要走的路：
if df |grep -q '/mnt/mountpoint$'
then
echo "Found mount point, running task"
# Do some stuff
else
echo "Aborted because the disk is not mounted"
# Do some error correcting stuff
exit -1
fi
回答by mamiu
- Copy and paste the script below to a file (e.g. backup.sh).
- Make the script executable (e.g.
chmod +x backup.sh) - Call the script as root with the format
backup.sh [username (for rsync)] [backup source device] [backup source location] [backup target device] [backup target location]
- 将下面的脚本复制并粘贴到一个文件中（例如 backup.sh）。
- 使脚本可执行（例如
chmod +x backup.sh） - 使用以下格式以 root 身份调用脚本
backup.sh [username (for rsync)] [backup source device] [backup source location] [backup target device] [backup target location]
!!!ATTENTION!!! Don't execute the script as root user without understanding the code!
！！！注意力！！！不要在不了解代码的情况下以root用户身份执行脚本！
I think there's nothing to explain. The code is straightforward and well documented.
我觉得没什么好解释的。代码简单明了并且有据可查。
#!/bin/bash
##
## COMMAND USAGE: backup.sh [username] [backup source device] [backup source location] [backup target device] [backup target location]
##
## for example: sudo /home/manu/bin/backup.sh "manu" "/media/disk1" "/media/disk1/." "/media/disk2" "/media/disk2"
##
##
## VARIABLES
##
# execute as user
USER=""
# Set source location
BACKUP_SOURCE_DEV=""
BACKUP_SOURCE=""
# Set target location
BACKUP_TARGET_DEV=""
BACKUP_TARGET=""
# Log file
LOG_FILE="/var/log/backup_script.log"
##
## SCRIPT
##
function end() {
echo -e "###########################################################################\
#########################################################################\n\n" >> "$LOG_FILE"
exit
}
# Check that the log file exists
if [ ! -e "$LOG_FILE" ]; then
touch "$LOG_FILE"
chown $USER "$LOG_FILE"
fi
# Check if backup source device is mounted
if ! mountpoint "$BACKUP_SOURCE_DEV"; then
echo "$(date "+%Y-%m-%d %k:%M:%S") - ERROR: Backup source device is not mounted!" >> "$LOG_FILE"
end 1
fi
# Check that source dir exists and is readable.
if [ ! -r "$BACKUP_SOURCE" ]; then
echo "$(date "+%Y-%m-%d %k:%M:%S") - ERROR: Unable to read source dir." >> "$LOG_FILE"
echo "$(date "+%Y-%m-%d %k:%M:%S") - ERROR: Unable to sync." >> "$LOG_FILE"
end 1
fi
# Check that target dir exists and is writable.
if [ ! -w "$BACKUP_TARGET" ]; then
echo "$(date "+%Y-%m-%d %k:%M:%S") - ERROR: Unable to write to target dir." >> "$LOG_FILE"
echo "$(date "+%Y-%m-%d %k:%M:%S") - ERROR: Unable to sync." >> "$LOG_FILE"
end 1
fi
# Check if the drive is mounted
if ! mountpoint "$BACKUP_TARGET_DEV"; then
echo "$(date "+%Y-%m-%d %k:%M:%S") - WARNING: Backup device needs mounting!" >> "$LOG_FILE"
# If not, mount the drive
if mount "$BACKUP_TARGET_DEV" > /dev/null 2>&1 || /bin/false; then
echo "$(date "+%Y-%m-%d %k:%M:%S") - Backup device mounted." >> "$LOG_FILE"
else
echo "$(date "+%Y-%m-%d %k:%M:%S") - ERROR: Unable to mount backup device." >> "$LOG_FILE"
echo "$(date "+%Y-%m-%d %k:%M:%S") - ERROR: Unable to sync." >> "$LOG_FILE"
end 1
fi
fi
# Start entry in the log
echo "$(date "+%Y-%m-%d %k:%M:%S") - Sync started." >> "$LOG_FILE"
# Start sync
su -c "rsync -ayhEAX --progress --delete-after --inplace --compress-level=0 --log-file=\"$LOG_FILE\" \"$BACKUP_SOURCE\" \"$BACKUP_TARGET\"" $USER
echo "" >> "$LOG_FILE"
# Unmount the drive so it does not accidentally get damaged or wiped
if umount "$BACKUP_TARGET_DEV" > /dev/null 2>&1 || /bin/false; then
echo "$(date "+%Y-%m-%d %k:%M:%S") - Backup device unmounted." >> "$LOG_FILE"
else
echo "$(date "+%Y-%m-%d %k:%M:%S") - WARNING: Backup device could not be unmounted." >> "$LOG_FILE"
fi
# Exit successfully
end 0
回答by Mike Q
I am skimming This but I would think you would rather rsync -e ssh and setup the keys to accept the account.
我正在略读此内容，但我认为您更愿意 rsync -e ssh 并设置密钥以接受该帐户。
