FR: Support installing and managing `uv` with `uv tool`

[weihenglim]

Currently the documentation's recommended way of installing uv is via pipx. With the release of uv tool, it would be great to let uv manage itself, similar to how you can do pipx install pipx.

When testing on my Windows 11 machine, uv tool install uv works but the tool breaks when attempting to upgrade uv to the latest version:

> uv tool upgrade uv 
Resolved 1 package in 38ms
Prepared 1 package in 1ms
Installed 1 package in 8ms
 + uv==0.3.1
error: failed to remove file `C:\Users\User\.local\bin\uv.exe`
  Caused by: Access is denied. (os error 5)

> uv tool list
warning: Ignoring malformed tool `uv` (run `uv tool uninstall uv` to remove)

[charliermarsh]

Ahh yeah, that's a known issue on Windows: https://github.com/astral-sh/uv/issues/1368. You should be able to do uv self update if you installed via the standalone installers (as opposed to through pip or similar).

[weihenglim]

Ah that's a shame, was hoping it would be possible to just upgrade everything (including uv itself) with a single uv tool upgrade --all command. Guess I'll stick with the standalone installers for now.

[zanieb]

I'm not sure it makes sense to manage uv with uv, it creates a weird chicken and egg problem. You can definitely do uvx uv@version though!

[konstin]

rustup update updates both its managed toolchains, then does a self update, we should consider a similar convenience function for uv.

[zanieb]

Hm like uv upgrade?

• Upgrade self
• Upgrade all tools
• Upgrade all Python versions

Could be cool.

[weihenglim]

Hmm, I still can't seem to get uv tool upgrade uv to work on Windows using v0.5.8

>uv version
uv 0.5.8 (80d41671b 2024-12-11)

>uv tool upgrade uv
Updated uv v0.5.8 -> v0.5.9
 - uv==0.5.8
 + uv==0.5.9
error: Failed to upgrade uv
  Caused by: Failed to install entrypoint
  Caused by: failed to copy file from C:\Users\User\AppData\Roaming\uv\data\tools\uv\Scripts\uv.exe to C:\Users\User\.local\bin\uv.exe: The process cannot access the file because it is being used by another process. (os error 32)

>uv tool list
uv v0.5.9
- uv.exe
- uvx.exe

>uv version
uv 0.5.8 (80d41671b 2024-12-11)