扩展coLinux分区镜像文件

现在我用coLinux跑ArchLinux，镜像只有256M，不过装几个包就不够用了，急需扩展镜像大小。

link：http://colinux.wikia.com/wiki/ExpandingRoot

上面链接上说了很多方法，下面是我最喜欢的一种，优点是安全，且不需要额外软件（如cygwin），缺点是复制了两次已有fs，有点占空间，不过原始大小只有256M，所以没什么问题

1.关掉所有coLinux

2.假设现在的文件镜像为cur.img,复制一份，设文件名为old.img

3.创建新的镜像文件，假设新文件名为new.img，大小2G，则在命令行下运行

fsutil file createnew new.img 2147483648

注：Vista下需管理员权限

4. 修改coLinux的conf文件，把三个文件都挂上，例如：
hda1="c:\Program Files\coLinux\cur.img"
hda3="c:\Program Files\coLinux\old.img"
hda4="c:\Program Files\coLinux\new.img"

5. 启动coLinux

6. 检查old fs: e2fsck /dev/hda3

7. copy fs: dd if=/dev/hda3 of=/dev/hda4

8.检查new fs: e2fsck -f /dev/hda4

9.resize new fs: resize2fs -p /dev/hda4

10. 再检查 new fs: e2fsck /dev/hda4

11. 最后修改coLinux的conf文件，用new.img作为root，如果没有问题，就可以删掉cur.img和old.img

Comments

Determine Perspective Lines With Off-page Vanishing Point

In perspective drawing, a vanishing point represents a group of parallel lines, in other words, a direction. For any point on the paper, if we want a line towards the same direction (in the 3d space), we simply draw a line through it and the vanishing point. But sometimes the vanishing point is too far away, such that it is outside the paper/canvas. In this example, we have a point P and two perspective lines L1 and L2. The vanishing point VP is naturally the intersection of L1 and L2. The task is to draw a line through P and VP, without having VP on the paper. I am aware of a few traditional solutions: 1. Use extra pieces of paper such that we can extend L1 and L2 until we see VP. 2. Draw everything in a smaller scale, such that we can see both P and VP on the paper. Draw the line and scale everything back. 3. Draw a perspective grid using the Brewer Method. #1 and #2 might be quite practical. #3 may not guarantee a solution, unless we can measure distances/p...

Hardware Password Manager

[Updates 2025-01-20] The original blog post assumes that all passwords are stored in one password manager, and the password manager either unlocks everything or nothing (e.g. Keepass). After discussing with friends, I realized that if I use something like pass , and I use a hardware GPG token, I can actually store and sync all encrypted passwords to all devices, because I will only decrypt the passwords on demand, and the computer will not see the GPG private key. The compromise is that the computer will see the list of all password entries (e.g. accounts), as well as a few other issues . I've been using Keepass for many years. I don't use online password services because I cannot fully trust them. Besides, I may not always have Internet connection, which is why I also don't use a self-hosted service. Everything has been working fine, until I turn my paranoid knob to the max. Here's the thought experiment . The Imaginary Scenario Let's say I have 100 PCs for differe...

ESP32S3: Flash Encryption and Secure Boot

Flash encryption and secure boot are useful security features for ESP32S3 chip. While not perfect, they definitely make it harder to extract the secrets in the chip. However, it is tricky to enable both features at the same time. The topic is actually discussed in the official documentation: ESP32S3 Security Features Security Features Enablement Workflows Especially, the second one mentioned it is recommended to enable flash encryption before secure boot. But I still find the documentation confusing. In the end I was able to successfully enable both, here's my findings. My Understanding After my adventure, here's what I think could have worked. WARNING, this is untested. Follow Security Features Enablement Workflows : Burn all the keys, as long as their purpose eFuses and read/write protections Burn other security eFuses, but DO NOT burn ENABLE_SECURITY_DOWNLOAD in the middle, which is mentined at the end of the instruction for both flash encryption and secure boot. Burn...

WangLu's Notes

Search This Blog