How to make automatic update of console application in Linux on .Net Core?

Question

linux

I am developing a standalone console application for Linux using .Net Core. It is required that the application itself be updated via the Internet.

I decided to use the following sequence of actions:
- the application downloads the new version,
- updates (replaces) its files,
- restarts (using Process.Start).

But! Restarting the application runs into a "Permission denied" error, a problem that didn't exist on Windows. The bottom line is that after replacing the executable file, permission to run is reset from it.

How to bypass it?

Answer 1

Just set the rights after installing the updated version.
http://docs.go-mono.com/?link=T%3aMono.Unix.Native...

Answer 2

Everything has already been said about attributes. But if you upload to /tmp , then the execution attributes there may be reset or simply not run from there, depending on the /tmp mount options!
tmpfs on /tmp type tmpfs (rw,nosuid,nodev,noexec)
Here I have - nosuid (prohibit suid bit), noexec (prohibit execution), nodev (prohibit device descriptors).
My update process takes place in several stages
1) the application launch script checks the link in /tmp/uploaded
- if there is, it launches the application using this link with the --uploaded=path-to-new-version parameter and deletes the link itself (!)
- if not - launches the application at the standard location
2) the application checks its functionality using the --uploaded key, and if everything is fine, it makes a link to the current version to the standard place of the application, or it crashes by mistake.
3) When the new version is downloaded, a link is made to it in /tmp/uploaded and the application is extinguished
4) the application is restarted
As a result, even if the application with errors is uploaded, I always have the old version.

Answer 3

Set the executable attribute on the replaced file.

Answer 4

Create a package and deploy in the right way.
https://medium.com/bluekiri/packaging-a-net-core-s...
Or even easier, just change the file a bit.
https://github.com/qmfrederik/dotnet-packaging
Here I described how
How to build a light assembly of a .NET Core application?