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transmission: Configurable download directory permissions #70542

Merged
merged 1 commit into from
Dec 8, 2019
Merged

transmission: Configurable download directory permissions #70542

merged 1 commit into from
Dec 8, 2019
+14 −5

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dsg22
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@dsg22 dsg22 commented Oct 6, 2019

The ExecStartPre script previously ran a 'chmod 770' on all directories,
including complete and incomplete download directories. Change this
so it only ensures user and group rights, but don't touch world
permissions.

Motivation for this change

I would like to access my torrent complete folder (stored on NFS) from other sources. I have correct permissions set there, but on every start of the transmission service it resets the permissions to 770.

See also issue #55161

Things done
  • Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS)
  • Built on platform(s)
    • NixOS
    • macOS
    • other Linux distributions
  • Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
  • Tested compilation of all pkgs that depend on this change using nix-shell -p nix-review --run "nix-review wip"
  • Tested execution of all binary files (usually in ./result/bin/)
  • Determined the impact on package closure size (by running nix path-info -S before and after)
  • Ensured that relevant documentation is up to date
  • Fits CONTRIBUTING.md.
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@ofborg ofborg bot added 6.topic: nixos Issues or PRs affecting NixOS modules, or package usability issues specific to NixOS 8.has: module (update) This PR changes an existing module in `nixos/` 10.rebuild-darwin: 0 This PR does not cause any packages to rebuild on Darwin 10.rebuild-linux: 0 This PR does not cause any packages to rebuild on Linux labels Oct 6, 2019
@wizeman
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wizeman commented Oct 7, 2019

Hmm, this probably merits some discussion.

I had a similar problem as you. In my case I wanted to make sure that both the download-dir and incomplete-dir were readable by others over NFS. However, when I was looking into this I have also locally modified the transmission service to set the homeDir and settingsDir permissions to 700 (not readable by the transmission group nor by others), as I didn't see a need for anything more permissive. The latter works perfectly fine for me.

If there's a need for different permissions on different machines, perhaps they should be configurable?
I'd be happy to get rid of my local modifications.

@dsg22
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dsg22 commented Oct 7, 2019

Good points. Indeed, 700 should be enough. I also agree that making the permissions for download-dir and incomplete-dir configurable would be better.

I'll have another go at this and update the PR later.

@dsg22 dsg22 force-pushed the transmission-permissions branch from f9f4a63 to 8694886 Compare October 7, 2019 12:17
@dsg22 dsg22 changed the title transmission: Don't trample directory permissions transmission: Configurable download directory permissions Oct 7, 2019
@dsg22
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dsg22 commented Oct 7, 2019

I've reworked this to add a new option downloadDirPermissions which gets applied to download-dir and incomplete-dir. It defaults to 770 like the old code. I think that's a bad default, but I'd also like to avoid a package update changing people's torrent directory permissions. I'd like to hear others thoughts on this.

This patch also makes homeDir and settingsDir 700 (non-configurable). I don't expect this will affect anyone.

@dsg22
transmission: Configurable download directory permissions
58c0a05 
Allow the user to specify the permissions to apply to download folders
used by transmission. This is useful e.g. when they are stored on a
network share and accessed by other users.

This commit also makes the home and config directories 700, as there
is should be no need for wider permissions there.
@dsg22 dsg22 force-pushed the transmission-permissions branch from 8694886 to 58c0a05 Compare October 7, 2019 12:39
Lassulus
Lassulus approved these changes Dec 8, 2019
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LGTM, I have similiar issues currently with my transmission setup

@Lassulus Lassulus merged commit 077934e into NixOS:master Dec 8, 2019
@chreekat
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fyi, this change made the transmission service unusable with default settings.

  1. The download dir is a subdir of the home dir
  2. The home dir is 0700
  3. Therefore, nobody except the owner can traverse to the download dir

I have to also echo #55161 - why do the directories get their permissions set on every load of the service?

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hmm, this is indeed not very practical, I will have to fix that, thanks for pointing that out.

I guess we could add a check if the directory already exists and chmod it only then or do it in an activationScript.

@dsg22
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dsg22 commented Feb 24, 2020

There are already two pull requests open to fix the issue caused by this PR:
#76552
#78113

I agree though that setting perms on every start is suboptimal.

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@bb2020 ah, this looks good, is there a PR open for that?

@bb2020 bb2020 mentioned this pull request Feb 26, 2020
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@Janik-Haag Janik-Haag added the 12. first-time contribution This PR is the author's first one; please be gentle! label Jun 12, 2023
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6.topic: nixos Issues or PRs affecting NixOS modules, or package usability issues specific to NixOS 8.has: module (update) This PR changes an existing module in `nixos/` 10.rebuild-darwin: 0 This PR does not cause any packages to rebuild on Darwin 10.rebuild-linux: 0 This PR does not cause any packages to rebuild on Linux 12. first-time contribution This PR is the author's first one; please be gentle!
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