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* Support for fixed-output hashes over directory trees (i.e., over the

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NAR dump of the path).
This commit is contained in:
Eelco Dolstra 2005-02-22 21:14:41 +00:00
parent eda2c3c253
commit 3a2c3f0cf2
3 changed files with 35 additions and 16 deletions
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4
scripts/nix-prefetch-url.in
View file

@ -25,7 +25,7 @@ if test -z "$hash"; then
tmpPath1=/tmp/nix-prefetch-url-$$ # !!! security?
fi
# Perform the checkout.
# Perform the download.
@curl@ --fail --location --max-redirs 20 "$url" > $tmpPath1
# Compute the hash.
@ -47,7 +47,7 @@ storeExpr=$( \
| @bindir@/nix-instantiate -)
# Realise it.
finalPath=$(@bindir@/nix-store -q --force-realise $storeExpr)
finalPath=$(@bindir@/nix-store -r $storeExpr)
if ! test -n "$QUIET"; then echo "path is $finalPath" >&2; fi

7
src/libexpr/primops.cc
View file

@ -194,6 +194,7 @@ static Expr primDerivation(EvalState & state, const ATermVector & _args)
string outputHash;
string outputHashAlgo;
bool outputHashRecursive = false;
for (ATermIterator i(attrs.keys()); i; ++i) {
string key = aterm2String(*i);
@ -228,6 +229,11 @@ static Expr primDerivation(EvalState & state, const ATermVector & _args)
else if (key == "name") drvName = s;
else if (key == "outputHash") outputHash = s;
else if (key == "outputHashAlgo") outputHashAlgo = s;
else if (key == "outputHashMode") {
if (s == "recursive") outputHashRecursive = true;
else if (s == "flat") outputHashRecursive = false;
else throw Error(format("invalid value `%1%' for `outputHashMode' attribute") % s);
}
}
}
@ -255,6 +261,7 @@ static Expr primDerivation(EvalState & state, const ATermVector & _args)
h = parseHash32(ht, outputHash);
string s = outputHash;
outputHash = printHash(h);
if (outputHashRecursive) outputHashAlgo = "r:" + outputHashAlgo;
}
/* Check the derivation name. It shouldn't contain whitespace,

40
src/libstore/build.cc
View file

@ -1082,25 +1082,37 @@ void DerivationGoal::computeClosure()
outputs (i.e., the content hash should match the specified
hash). */
if (i->second.hash != "") {
HashType ht = parseHashType(i->second.hashAlgo);
bool recursive = false;
string algo = i->second.hashAlgo;
if (string(algo, 0, 2) == "r:") {
recursive = true;
algo = string(algo, 2);
}
if (!recursive) {
/* The output path should be a regular file without
execute permission. */
struct stat st;
if (lstat(path.c_str(), &st))
throw SysError(format("getting attributes of path `%1%'") % path);
if (!S_ISREG(st.st_mode) || (st.st_mode & S_IXUSR) != 0)
throw Error(
format("output path `%1% should be a non-executable regular file")
% path);
}
/* Check the hash. */
HashType ht = parseHashType(algo);
if (ht == htUnknown)
throw Error(format("unknown hash algorithm `%1%'") % i->second.hashAlgo);
throw Error(format("unknown hash algorithm `%1%'") % algo);
Hash h = parseHash(ht, i->second.hash);
Hash h2 = hashFile(ht, path);
Hash h2 = recursive ? hashPath(ht, path) : hashFile(ht, path);
if (h != h2)
throw Error(
format("output path `%1% should have %2% hash `%3%', instead has `%4%'")
% path % i->second.hashAlgo % printHash(h) % printHash(h2));
/* Also, the output path should be a regular file withouth
execute permission. */
struct stat st;
if (lstat(path.c_str(), &st))
throw SysError(format("getting attributes of path `%1%'") % path);
if (!S_ISREG(st.st_mode) || (st.st_mode & S_IXUSR) != 0)
throw Error(
format("output path `%1% should be a non-executable regular file")
% path);
% path % algo % printHash(h) % printHash(h2));
}
canonicalisePathMetaData(path);