75 lines
2.0 KiB
Bash
Executable File
75 lines
2.0 KiB
Bash
Executable File
#! /bin/sh -e
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url=$1
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rev=$2
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hash=$3
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if test -z "$url"; then
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echo "syntax: nix-prefetch-svn URL [REVISION]" >&2
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exit 1
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fi
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test -n "$rev" || rev="HEAD"
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# Use a restrictive umask to ensure that the output in the Nix store
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# is not group- or world-writable. Nix 0.10 complains about this.
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umask 0022
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# Determine the hash, unless it was given.
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if test -z "$hash"; then
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# !!! hacky; we should have a way to query the location of the store.
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if storeDir=$(which nix-store); then
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storeDir=$(dirname $(dirname "$storeDir"))/store
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else
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storeDir=/nix/store
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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/svn-checkout-tmp-$$
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# Test whether we have write permission in the store. If not,
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# fetch to /tmp and don't copy to the store. This is a hack to
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# make this script at least work somewhat in setuid installations.
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if ! touch $tmpPath1 2> /dev/null; then
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echo "(cannot write to the store, result won't be cached)" >&2
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dummyMode=1
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tmpPath1=/tmp/nix-prefetch-svn-$$ # !!! security?
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fi
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rm -f $tmpPath1
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# Perform the checkout.
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svn export -r "$rev" "$url" $tmpPath1 >&2
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# Compute the hash.
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hash=$(nix-hash $tmpPath1)
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echo "hash is $hash" >&2
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# Rename it so that the fetchsvn builder can find it.
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if test "$dummyMode" != 1; then
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tmpPath2=$storeDir/svn-checkout-tmp-$hash
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test -e $tmpPath2 || mv $tmpPath1 $tmpPath2 # !!! race
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fi
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fi
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# Create a Nix expression that does a fetchsvn.
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nixExpr=$(dirname $(readlink -f $0))/../../system/i686-linux.nix
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storeExpr=$( \
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echo "(import $nixExpr).fetchsvn {url=\"$url\"; rev=\"$rev\"; md5=\"$hash\";}" \
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| nix-instantiate -)
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# Realise it.
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finalPath=$(nix-store -r $storeExpr)
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echo "path is $finalPath" >&2
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if test -n "$tmpPath1" -o -n "$tmpPath2"; then
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rm -rf $tmpPath1 $tmpPath2 || true
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fi
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echo $hash
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if test -n "$PRINT_PATH"; then
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echo $finalPath
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fi
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