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mac-create-vdisk.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+
+set -e
+
+DISKNAME=vdisk
+DISKSIZE=33554432 # 磁盘扇区数，每个扇区大小是 512 字节，n*1024*1024*1024/512 = n Gigabytes. Do NOT set the formula to DISKSIZE.
+# 虚拟磁盘并不是一创建就把内存空间划走，而是等到真正写入了虚拟磁盘的时候，才会使用对应的内存空间，所以给虚拟磁盘分配大一点的空间是没有问题的
+
+if [ -d /Volumes/$DISKNAME ]; then
+  echo 'Found /Volumes/$DISKNAME!'
+else
+  DISKID=$(hdid -nomount ram://$DISKSIZE)
+  diskutil apfs create ${DISKID} $DISKNAME
+fi
+
+# copy this script to some public folder, e.g. `sudo cp this-script.sh /etc/`, because in my test, it doesn't work in /Users/...
+# copy the corresponding plist file to /Library/LaunchDaemons/,
+# optionally run `sudo launchctl load /Library/LaunchDaemons/my-launch-file.plist` immediately for test.