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|
#! @shell@ -e
url=$1
hash=$2
hashType=$NIX_HASH_ALGO
if test -z "$hashType"; then
hashType=md5
fi
hashFormat=
if test "$hashType" != "md5"; then
hashFormat=--base32
fi
if test -z "$url"; then
echo "syntax: nix-prefetch-url URL" >&2
exit 1
fi
# Determine the hash, unless it was given.
if test -z "$hash"; then
# !!! race
tmpPath1=@storedir@/nix-prefetch-url-$$
# Test whether we have write permission in the store. If not,
# fetch to /tmp and don't copy to the store. This is a hack to
# make this script at least work somewhat in setuid installations.
if ! touch $tmpPath1 2> /dev/null; then
echo "(cannot write to the store, result won't be cached)" >&2
dummyMode=1
tmpPath1=/tmp/nix-prefetch-url-$$ # !!! security?
fi
# Perform the download.
@curl@ --fail --location --max-redirs 20 "$url" > $tmpPath1
# Compute the hash.
hash=$(@bindir@/nix-hash --type "$hashType" $hashFormat --flat $tmpPath1)
if ! test -n "$QUIET"; then echo "hash is $hash" >&2; fi
# Rename it so that the fetchurl builder can find it.
if test "$dummyMode" != 1; then
tmpPath2=@storedir@/nix-prefetch-url-$hash
test -e $tmpPath2 || mv $tmpPath1 $tmpPath2 # !!! race
fi
fi
# Create a Nix expression that does a fetchurl.
storeExpr=$( \
echo "(import @datadir@/nix/corepkgs/fetchurl) \
{url = $url; outputHashAlgo = \"$hashType\"; outputHash = \"$hash\"; system = \"@system@\";}" \
| @bindir@/nix-instantiate -)
# Realise it.
finalPath=$(@bindir@/nix-store -r $storeExpr)
if ! test -n "$QUIET"; then echo "path is $finalPath" >&2; fi
if test -n "$tmpPath1" -o -n "$tmpPath2"; then
rm -rf $tmpPath1 $tmpPath2 || true
fi
echo $hash
if test -n "$PRINT_PATH"; then
echo $finalPath
fi
|
