{"action":"created","issue":{"url":"https://api.github.com/repos/NixOS/nixpkgs/issues/7669","labels_url":"https://api.github.com/repos/NixOS/nixpkgs/issues/7669/labels{/name}","comments_url":"https://api.github.com/repos/NixOS/nixpkgs/issues/7669/comments","events_url":"https://api.github.com/repos/NixOS/nixpkgs/issues/7669/events","html_url":"https://github.com/NixOS/nixpkgs/issues/7669","id":72785143,"number":7669,"title":"sudo nix-channel --update fails on recent unstable-channel","user":{"login":"the-kenny","id":31167,"avatar_url":"https://avatars.githubusercontent.com/u/31167?v=3","gravatar_id":"","url":"https://api.github.com/users/the-kenny","html_url":"https://github.com/the-kenny","followers_url":"https://api.github.com/users/the-kenny/followers","following_url":"https://api.github.com/users/the-kenny/following{/other_user}","gists_url":"https://api.github.com/users/the-kenny/gists{/gist_id}","starred_url":"https://api.github.com/users/the-kenny/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/the-kenny/subscriptions","organizations_url":"https://api.github.com/users/the-kenny/orgs","repos_url":"https://api.github.com/users/the-kenny/repos","events_url":"https://api.github.com/users/the-kenny/events{/privacy}","received_events_url":"https://api.github.com/users/the-kenny/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":2,"created_at":"2015-05-03T10:23:21Z","updated_at":"2015-05-03T12:18:04Z","closed_at":null,"body":"It seems like I hit an issue where I can't upgrade my system on the unstable channel anymore. ```sudo nix-channel --update``` or ```sudo nixos-rebuild ... --upgrade``` fails with:\r\n\r\n```\r\ndownloading Nix expressions from ‘https://nixos.org/releases/nixos/unstable/nixos-15.05pre61665.4c01e6d/nixexprs.tar.xz’...\r\n  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current\r\n                                 Dload  Upload   Total   Spent    Left  Speed\r\n  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0\r\nunpacking channels...\r\n/nix/store/j7ghngyylfkl64xx1js6f2dfix48fw7g-xz-5.2.0/bin/xz: (stdin): File format not recognized\r\n/nix/store/s16y2pk8lljsm37b55h2dsl6gpbsb62g-gnutar-1.27.1/bin/tar: This does not look like a tar archive\r\n/nix/store/s16y2pk8lljsm37b55h2dsl6gpbsb62g-gnutar-1.27.1/bin/tar: Exiting with failure status due to previous errors\r\nbuilder for ‘/nix/store/35lmnri499d3kifqbzaz35hz067zfwsv-nixos-15.05pre61665.4c01e6d.drv’ failed with exit code 2\r\n```\r\n\r\nThis is on ```15.05pre61665.4c01e6d (Dingo)``` but as far as I know, @1126 hit the issue on earlier channels too.\r\n\r\n\r\nIf this is fixed in master already, can someone please document here how to get out of this? I can rebuild from git just fine, but we should document issues like this.\r\n\r\n"},"comment":{"url":"https://api.github.com/repos/NixOS/nixpkgs/issues/comments/98474794","html_url":"https://github.com/NixOS/nixpkgs/issues/7669#issuecomment-98474794","issue_url":"https://api.github.com/repos/NixOS/nixpkgs/issues/7669","id":98474794,"user":{"login":"domenkozar","id":126339,"avatar_url":"https://avatars.githubusercontent.com/u/126339?v=3","gravatar_id":"","url":"https://api.github.com/users/domenkozar","html_url":"https://github.com/domenkozar","followers_url":"https://api.github.com/users/domenkozar/followers","following_url":"https://api.github.com/users/domenkozar/following{/other_user}","gists_url":"https://api.github.com/users/domenkozar/gists{/gist_id}","starred_url":"https://api.github.com/users/domenkozar/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/domenkozar/subscriptions","organizations_url":"https://api.github.com/users/domenkozar/orgs","repos_url":"https://api.github.com/users/domenkozar/repos","events_url":"https://api.github.com/users/domenkozar/events{/privacy}","received_events_url":"https://api.github.com/users/domenkozar/received_events","type":"User","site_admin":false},"created_at":"2015-05-03T12:18:04Z","updated_at":"2015-05-03T12:18:04Z","body":"Could be related to https://github.com/NixOS/nix/commit/8a84bd8c8bda1e4c6764c10ecdef9d74e4884800, what's the output of `nix-env --version`?"}}