diff options
Diffstat (limited to 'tools/nixery/build-image/load-pkgs.nix')
| -rw-r--r-- | tools/nixery/build-image/load-pkgs.nix | 54 |
1 files changed, 13 insertions, 41 deletions
diff --git a/tools/nixery/build-image/load-pkgs.nix b/tools/nixery/build-image/load-pkgs.nix index 3e8b450c45..cceebfc14d 100644 --- a/tools/nixery/build-image/load-pkgs.nix +++ b/tools/nixery/build-image/load-pkgs.nix @@ -12,17 +12,9 @@ # See the License for the specific language governing permissions and # limitations under the License. -# Load a Nix package set from a source specified in one of the following -# formats: -# -# 1. nixpkgs!$channel (e.g. nixpkgs!nixos-19.03) -# 2. git!$repo!$rev (e.g. git!git@github.com:NixOS/nixpkgs.git!master) -# 3. path!$path (e.g. path!/var/local/nixpkgs) -# -# '!' was chosen as the separator because `builtins.split` does not -# support regex escapes and there are few other candidates. It -# doesn't matter much because this is invoked by the server. -{ pkgSource, args ? { } }: +# Load a Nix package set from one of the supported source types +# (nixpkgs, git, path). +{ srcType, srcArgs, importArgs ? { } }: with builtins; let @@ -32,42 +24,22 @@ let let url = "https://github.com/NixOS/nixpkgs-channels/archive/${channel}.tar.gz"; - in import (fetchTarball url) args; + in import (fetchTarball url) importArgs; # If a git repository is requested, it is retrieved via # builtins.fetchGit which defaults to the git configuration of the # outside environment. This means that user-configured SSH # credentials etc. are going to work as expected. - fetchImportGit = url: rev: - let - # builtins.fetchGit needs to know whether 'rev' is a reference - # (e.g. a branch/tag) or a revision (i.e. a commit hash) - # - # Since this data is being extrapolated from the supplied image - # tag, we have to guess if we want to avoid specifying a format. - # - # There are some additional caveats around whether the default - # branch contains the specified revision, which need to be - # explained to users. - spec = if (stringLength rev) == 40 then { - inherit url rev; - } else { - inherit url; - ref = rev; - }; - in import (fetchGit spec) args; + fetchImportGit = spec: import (fetchGit spec) importArgs; # No special handling is used for paths, so users are expected to pass one # that will work natively with Nix. - importPath = path: import (toPath path) args; - - source = split "!" pkgSource; - sourceType = elemAt source 0; -in if sourceType == "nixpkgs" then - fetchImportChannel (elemAt source 2) -else if sourceType == "git" then - fetchImportGit (elemAt source 2) (elemAt source 4) -else if sourceType == "path" then - importPath (elemAt source 2) + importPath = path: import (toPath path) importArgs; +in if srcType == "nixpkgs" then + fetchImportChannel srcArgs +else if srcType == "git" then + fetchImportGit (fromJSON srcArgs) +else if srcType == "path" then + importPath srcArgs else - throw ("Invalid package set source specification: ${pkgSource}") + throw ("Invalid package set source specification: ${srcType} (${srcArgs})") |