guix/corepkgs/channels/unpack.sh.in
Eelco Dolstra 055608227f * nix-env: allow ~/.nix-defexpr to be a directory. If it is, then the
Nix expressions in that directory are combined into an attribute set
  {file1 = import file1; file2 = import file2; ...}, i.e. each Nix
  expression is an attribute with the file name as the attribute
  name.  Also recurses into directories.

* nix-env: removed the "--import" (-I) option which set the
  ~/.nix-defexpr symlink.

* nix-channel: don't use "nix-env --import", instead symlink
  ~/.nix-defexpr/channels.  So finally nix-channel --update doesn't
  override any default Nix expressions but combines with them.

  This means that you can have (say) a local Nixpkgs SVN tree and use
  it as a default for nix-env:

  $ ln -s .../path-to-nixpkgs-tree ~/.nix-defexpr/nixpkgs_svn

  and be subscribed to channels (including Nixpkgs) at the same time.
  (If there is any ambiguity, the -A flag can be used to
  disambiguate, e.g. "nix-env -i -A nixpkgs_svn.pan".)
2007-09-17 16:08:24 +00:00

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#! @shell@ -e
@coreutils@/mkdir $out
@coreutils@/mkdir $out/tmp
cd $out/tmp
inputs=($inputs)
for ((n = 0; n < ${#inputs[*]}; n += 2)); do
channelName=${inputs[n]}
channelTarball=${inputs[n+1]}
echo "unpacking channel $channelName"
@bunzip2@ < $channelTarball | @tar@ xf -
nr=1
attrName=$(echo $channelName | @tr@ -- '- ' '__')
dirName=$attrName
while test -e ../$dirName; do
nr=$((nr+1))
dirName=$attrName-$nr
done
@coreutils@/mv * ../$dirName # !!! hacky
done
cd ..
@coreutils@/rmdir tmp