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21655a70f5
Nix expressions.
To subscribe to a channel (needs to be done only once):
nix-channel --add \
http://catamaran.labs.cs.uu.nl/dist/nix/channels/nixpkgs-unstable
This just adds the given URL to ~/.nix-channels (which can also be
edited manually).
To update from all channels:
nix-channel --update
This fetches the latest expressions and pulls cache manifests. The
default Nix expression (~/.nix-defexpr) is made to point to the
conjunction of the expressions downloaded from all channels.
So to update all installed derivations in the current user
environment:
nix-channel --update
nix-env --upgrade '*'
If you are really courageous, you can put this in a cronjob or
something.
You can subscribe to multiple channels. It is not entirely clear
what happens when there are name clashes between derivations from
different channels. From nix-env/main.cc it appears that the one
with the lowest (highest?) hash will be used, which is pretty
meaningless.
37 lines
893 B
Text
37 lines
893 B
Text
#! @shell@ -e
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url=$1
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if test -z "$url"; then
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echo "syntax: nix-prefetch-url URL" >&2
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exit 1
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fi
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# !!! race? should be relatively safe, `svn export' barfs if $tmpPath exists.
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tmpPath1=@storedir@/nix-prefetch-url-$$
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# Perform the checkout.
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@curl@ --fail --location --max-redirs 20 "$url" > $tmpPath1
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# Compute the hash.
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hash=$(@bindir@/nix-hash --flat $tmpPath1)
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echo "hash is $hash" >&2
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# Rename it so that the fetchsvn builder can find it.
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tmpPath2=@storedir@/nix-prefetch-url-$hash
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test -e $tmpPath2 || mv $tmpPath1 $tmpPath2 # !!! race
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# Create a Nix expression that does a fetchsvn.
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storeExpr=$( \
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echo "(import @datadir@/nix/corepkgs/fetchurl) \
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{url = $url; md5 = \"$hash\"; system = \"@system@\";}" \
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| nix-instantiate -)
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# Realise it.
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finalPath=$(nix-store -qnB --force-realise $storeExpr)
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echo "path is $finalPath" >&2
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rm -rf $tmpPath2 || true
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echo $hash
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