nixpkgs/pkgs/build-support/buildenv/default.nix
aszlig 4529ed1259
buildEnv: Check the content of colliding paths.
Originally wanted to include ignoreCollisions in cups-progs, but I think
it's better if we use ignoreCollisions only if there are _real_
collisions between files with different contents.

Of course, we also check whether the file permissions match, so you get
a collision if contents are the same but the permissions are different.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
2016-01-18 03:54:22 +01:00

63 lines
1.8 KiB
Nix

# buildEnv creates a tree of symlinks to the specified paths. This is
# a fork of the buildEnv in the Nix distribution. Most changes should
# eventually be merged back into the Nix distribution.
{ perl, runCommand, lib }:
{ name
, # The manifest file (if any). A symlink $out/manifest will be
# created to it.
manifest ? ""
, # The paths to symlink.
paths
, # Whether to ignore collisions or abort.
ignoreCollisions ? false
, # If there is a collision, check whether the contents and permissions match
# and only if not, throw a collision error.
checkCollisionContents ? true
, # The paths (relative to each element of `paths') that we want to
# symlink (e.g., ["/bin"]). Any file not inside any of the
# directories in the list is not symlinked.
pathsToLink ? ["/"]
, # The package outputs to include. By default, only the default
# output is included.
outputsToLink ? []
, # Root the result in directory "$out${extraPrefix}", e.g. "/share".
extraPrefix ? ""
, # Shell commands to run after building the symlink tree.
postBuild ? ""
, # Additional inputs. Handy e.g. if using makeWrapper in `postBuild`.
buildInputs ? []
, passthru ? {}
, meta ? {}
}:
runCommand name
rec {
inherit manifest ignoreCollisions checkCollisionContents passthru
meta pathsToLink extraPrefix postBuild buildInputs;
pkgs = builtins.toJSON (map (drv: {
paths =
[ drv ]
++ lib.concatMap (outputName: lib.optional (drv.${outputName}.outPath or null != null) drv.${outputName}) outputsToLink;
priority = drv.meta.priority or 5;
}) paths);
preferLocalBuild = true;
# XXX: The size is somewhat arbitrary
passAsFile = if builtins.stringLength pkgs >= 128*1024 then [ "pkgs" ] else null;
}
''
${perl}/bin/perl -w ${./builder.pl}
eval "$postBuild"
''