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Documentation: Document fix for missing /etc/mtab

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/etc/mtab is identical to /proc/self/mounts, but it does not exist under
many circumstances, e.g. chroot'ed or in WSL. The fact that many
userspace programs rely on this file existing and the user needing to
create symlinks manually has been a long-standing issue (there's pretty
old forum posts on Debian and Arch Linux forums about it), but it's not
fixed upstream. This short mention should save people some time.
This commit is contained in:
kleines Filmröllchen 2022-12-28 14:00:29 +01:00 committed by Linus Groh
parent 2afe9f574e
commit b36d09bab0
Notes: sideshowbarker 2024-07-17 02:14:32 +09:00 
Author: https://github.com/kleinesfilmroellchen
Commit: https://github.com/SerenityOS/serenity/commit/b36d09bab0
Pull-request: https://github.com/SerenityOS/serenity/pull/16695
Reviewed-by: https://github.com/BenWiederhake ✅
1 changed files with 2 additions and 0 deletions
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Documentation/BuildInstructions.md
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@ -88,6 +88,8 @@ Meta/serenity.sh run
This will compile all of SerenityOS and install the built files into the `Build/x86_64/Root` directory inside your Git
repository. It will also build a disk image and start SerenityOS using QEMU.
If, during build, an error like `fusermount: failed to open /etc/mtab: No such file or directory` appears, you have installed `fuse2fs` but your system does not provide the mtab symlink for various reasons. Simply create this symlink with `ln -sv /proc/self/mounts /etc/mtab`.
Note that the `anon` user is able to become `root` without a password by default, as a development convenience.
To prevent this, remove `anon` from the `wheel` group and he will no longer be able to run `/bin/su`.