nix profile install: packages have the same priority (when trying to re-install)

[nmattia]

Describe the bug

Looks like there is no way to re-install a package with the nix profile install command. It fails with the following error:

$ nix profile install
error: packages '/nix/store/d0wb2gam2pyksz2dsjx6sa83761jrrgi-hello-2.12/bin/hello' and '/nix/store/61n15131n3b9mn7ajvddbyfnv2b3pgjd-hello-2.12/bin/hello' have the same priority 5
; use 'nix-env --set-flag priority NUMBER INSTALLED_PKGNAME' to change the priority of one of the conflicting packages (0 being the highest priority)

I'm not sure how nix-env dealt with this.

(note: the 'nix-env' command suggested in the error message doesn't work because it complains that the profile was installed with "nix profile"; also this wouldn't really solve the issue)

Steps To Reproduce

$ nix flake init
$ nix profile install
# now edit `flake.nix` to change the "hello" derivation, for instance:
$ cat flake.nix
... hello.overrideAttrs (_: {
      postBuild = "echo hello";

    });
$ $ nix profile install
error: packages '/nix/store/d0wb2gam2pyksz2dsjx6sa83761jrrgi-hello-2.12/bin/hello' and '/nix/store/61n15131n3b9mn7ajvddbyfnv2b3pgjd-hello-2.12/bin/hello' have the same priority 5
; use 'nix-env --set-flag priority NUMBER INSTALLED_PKGNAME' to change the priority of one of the conflicting packages (0 being the highest priority)

Expected behavior

The hello package should be replaced.

A clear and concise description of what you expected to happen.

nix-env --version output

$ nix-env --version
nix-env (Nix) 2.6.0

Additional context

Running nix profile upgrade doesn't do anything. For now the workaround is to nix profile remove everything before nix profile installing.

---

EDIT: I just realized that nix profile upgrade can take a number. When giving it the same number of the flake used to install hello, I get the same error as nix profile install:

$ nix profile list | grep hello
6 path:/private/var/folders/tx/d4435y0s3dqbytdf1f09s8740000gn/T/tmp.YFCSpO8v#defaultPackage.aarch64-darwin path:/private/var/folders/tx/d4435y0s3dqbytdf1f09s8740000gn/T/tmp.YFCSp
O8v?narHash=sha256-JyMfoXbdBn9JlHIPJOPupn0K0zSuniX7bSFf1XQKY5I=#defaultPackage.aarch64-darwin /nix/store/61n15131n3b9mn7ajvddbyfnv2b3pgjd-hello-2.12
$ nix profile upgrade 6
error: packages '/nix/store/d0wb2gam2pyksz2dsjx6sa83761jrrgi-hello-2.12/bin/hello' and '/nix/store/61n15131n3b9mn7ajvddbyfnv2b3pgjd-hello-2.12/bin/hello' have the same priority 5
; use 'nix-env --set-flag priority NUMBER INSTALLED_PKGNAME' to change the priority of one of the conflicting packages (0 being the highest priority)

[blaggacao]

I suspect: (at least touching the same topic-circle)

nix/src/nix/profile.cc

Line 40 in caf5172

// FIXME: priority

[jrpear]

I have this same issue when trying to install wine and wine64 with the file .../bin/function_grep.pl using nix profile install.

[AndersonTorres]

Bump :/

[elikoga]

bumping for self reference, might try at implementing