321 lines
8.8 KiB
C++
321 lines
8.8 KiB
C++
#include "store-api.hh"
|
||
#include "globals.hh"
|
||
#include "util.hh"
|
||
|
||
|
||
namespace nix {
|
||
|
||
|
||
bool isInStore(const Path & path)
|
||
{
|
||
return isInDir(path, settings.nixStore);
|
||
}
|
||
|
||
|
||
bool isStorePath(const Path & path)
|
||
{
|
||
return isInStore(path)
|
||
&& path.find('/', settings.nixStore.size() + 1) == Path::npos;
|
||
}
|
||
|
||
|
||
void assertStorePath(const Path & path)
|
||
{
|
||
if (!isStorePath(path))
|
||
throw Error(format("path ‘%1%’ is not in the Nix store") % path);
|
||
}
|
||
|
||
|
||
Path toStorePath(const Path & path)
|
||
{
|
||
if (!isInStore(path))
|
||
throw Error(format("path ‘%1%’ is not in the Nix store") % path);
|
||
Path::size_type slash = path.find('/', settings.nixStore.size() + 1);
|
||
if (slash == Path::npos)
|
||
return path;
|
||
else
|
||
return Path(path, 0, slash);
|
||
}
|
||
|
||
|
||
Path followLinksToStore(const Path & _path)
|
||
{
|
||
Path path = absPath(_path);
|
||
while (!isInStore(path)) {
|
||
if (!isLink(path)) break;
|
||
string target = readLink(path);
|
||
path = absPath(target, dirOf(path));
|
||
}
|
||
if (!isInStore(path))
|
||
throw Error(format("path ‘%1%’ is not in the Nix store") % path);
|
||
return path;
|
||
}
|
||
|
||
|
||
Path followLinksToStorePath(const Path & path)
|
||
{
|
||
return toStorePath(followLinksToStore(path));
|
||
}
|
||
|
||
|
||
string storePathToName(const Path & path)
|
||
{
|
||
assertStorePath(path);
|
||
return string(path, settings.nixStore.size() + 34);
|
||
}
|
||
|
||
|
||
void checkStoreName(const string & name)
|
||
{
|
||
string validChars = "+-._?=";
|
||
/* Disallow names starting with a dot for possible security
|
||
reasons (e.g., "." and ".."). */
|
||
if (string(name, 0, 1) == ".")
|
||
throw Error(format("illegal name: ‘%1%’") % name);
|
||
for (auto & i : name)
|
||
if (!((i >= 'A' && i <= 'Z') ||
|
||
(i >= 'a' && i <= 'z') ||
|
||
(i >= '0' && i <= '9') ||
|
||
validChars.find(i) != string::npos))
|
||
{
|
||
throw Error(format("invalid character ‘%1%’ in name ‘%2%’")
|
||
% i % name);
|
||
}
|
||
}
|
||
|
||
|
||
/* Store paths have the following form:
|
||
|
||
<store>/<h>-<name>
|
||
|
||
where
|
||
|
||
<store> = the location of the Nix store, usually /nix/store
|
||
|
||
<name> = a human readable name for the path, typically obtained
|
||
from the name attribute of the derivation, or the name of the
|
||
source file from which the store path is created. For derivation
|
||
outputs other than the default "out" output, the string "-<id>"
|
||
is suffixed to <name>.
|
||
|
||
<h> = base-32 representation of the first 160 bits of a SHA-256
|
||
hash of <s>; the hash part of the store name
|
||
|
||
<s> = the string "<type>:sha256:<h2>:<store>:<name>";
|
||
note that it includes the location of the store as well as the
|
||
name to make sure that changes to either of those are reflected
|
||
in the hash (e.g. you won't get /nix/store/<h>-name1 and
|
||
/nix/store/<h>-name2 with equal hash parts).
|
||
|
||
<type> = one of:
|
||
"text:<r1>:<r2>:...<rN>"
|
||
for plain text files written to the store using
|
||
addTextToStore(); <r1> ... <rN> are the references of the
|
||
path.
|
||
"source"
|
||
for paths copied to the store using addToStore() when recursive
|
||
= true and hashAlgo = "sha256"
|
||
"output:<id>"
|
||
for either the outputs created by derivations, OR paths copied
|
||
to the store using addToStore() with recursive != true or
|
||
hashAlgo != "sha256" (in that case "source" is used; it's
|
||
silly, but it's done that way for compatibility). <id> is the
|
||
name of the output (usually, "out").
|
||
|
||
<h2> = base-16 representation of a SHA-256 hash of:
|
||
if <type> = "text:...":
|
||
the string written to the resulting store path
|
||
if <type> = "source":
|
||
the serialisation of the path from which this store path is
|
||
copied, as returned by hashPath()
|
||
if <type> = "output:out":
|
||
for non-fixed derivation outputs:
|
||
the derivation (see hashDerivationModulo() in
|
||
primops.cc)
|
||
for paths copied by addToStore() or produced by fixed-output
|
||
derivations:
|
||
the string "fixed:out:<rec><algo>:<hash>:", where
|
||
<rec> = "r:" for recursive (path) hashes, or "" or flat
|
||
(file) hashes
|
||
<algo> = "md5", "sha1" or "sha256"
|
||
<hash> = base-16 representation of the path or flat hash of
|
||
the contents of the path (or expected contents of the
|
||
path for fixed-output derivations)
|
||
|
||
It would have been nicer to handle fixed-output derivations under
|
||
"source", e.g. have something like "source:<rec><algo>", but we're
|
||
stuck with this for now...
|
||
|
||
The main reason for this way of computing names is to prevent name
|
||
collisions (for security). For instance, it shouldn't be feasible
|
||
to come up with a derivation whose output path collides with the
|
||
path for a copied source. The former would have a <s> starting with
|
||
"output:out:", while the latter would have a <2> starting with
|
||
"source:".
|
||
*/
|
||
|
||
|
||
Path makeStorePath(const string & type,
|
||
const Hash & hash, const string & name)
|
||
{
|
||
/* e.g., "source:sha256:1abc...:/nix/store:foo.tar.gz" */
|
||
string s = type + ":sha256:" + printHash(hash) + ":"
|
||
+ settings.nixStore + ":" + name;
|
||
|
||
checkStoreName(name);
|
||
|
||
return settings.nixStore + "/"
|
||
+ printHash32(compressHash(hashString(htSHA256, s), 20))
|
||
+ "-" + name;
|
||
}
|
||
|
||
|
||
Path makeOutputPath(const string & id,
|
||
const Hash & hash, const string & name)
|
||
{
|
||
return makeStorePath("output:" + id, hash,
|
||
name + (id == "out" ? "" : "-" + id));
|
||
}
|
||
|
||
|
||
Path makeFixedOutputPath(bool recursive,
|
||
HashType hashAlgo, Hash hash, string name)
|
||
{
|
||
return hashAlgo == htSHA256 && recursive
|
||
? makeStorePath("source", hash, name)
|
||
: makeStorePath("output:out", hashString(htSHA256,
|
||
"fixed:out:" + (recursive ? (string) "r:" : "") +
|
||
printHashType(hashAlgo) + ":" + printHash(hash) + ":"),
|
||
name);
|
||
}
|
||
|
||
|
||
std::pair<Path, Hash> computeStorePathForPath(const Path & srcPath,
|
||
bool recursive, HashType hashAlgo, PathFilter & filter)
|
||
{
|
||
HashType ht(hashAlgo);
|
||
Hash h = recursive ? hashPath(ht, srcPath, filter).first : hashFile(ht, srcPath);
|
||
string name = baseNameOf(srcPath);
|
||
Path dstPath = makeFixedOutputPath(recursive, hashAlgo, h, name);
|
||
return std::pair<Path, Hash>(dstPath, h);
|
||
}
|
||
|
||
|
||
Path computeStorePathForText(const string & name, const string & s,
|
||
const PathSet & references)
|
||
{
|
||
Hash hash = hashString(htSHA256, s);
|
||
/* Stuff the references (if any) into the type. This is a bit
|
||
hacky, but we can't put them in `s' since that would be
|
||
ambiguous. */
|
||
string type = "text";
|
||
for (auto & i : references) {
|
||
type += ":";
|
||
type += i;
|
||
}
|
||
return makeStorePath(type, hash, name);
|
||
}
|
||
|
||
|
||
/* Return a string accepted by decodeValidPathInfo() that
|
||
registers the specified paths as valid. Note: it's the
|
||
responsibility of the caller to provide a closure. */
|
||
string StoreAPI::makeValidityRegistration(const PathSet & paths,
|
||
bool showDerivers, bool showHash)
|
||
{
|
||
string s = "";
|
||
|
||
for (auto & i : paths) {
|
||
s += i + "\n";
|
||
|
||
ValidPathInfo info = queryPathInfo(i);
|
||
|
||
if (showHash) {
|
||
s += printHash(info.hash) + "\n";
|
||
s += (format("%1%\n") % info.narSize).str();
|
||
}
|
||
|
||
Path deriver = showDerivers ? info.deriver : "";
|
||
s += deriver + "\n";
|
||
|
||
s += (format("%1%\n") % info.references.size()).str();
|
||
|
||
for (auto & j : info.references)
|
||
s += j + "\n";
|
||
}
|
||
|
||
return s;
|
||
}
|
||
|
||
|
||
ValidPathInfo decodeValidPathInfo(std::istream & str, bool hashGiven)
|
||
{
|
||
ValidPathInfo info;
|
||
getline(str, info.path);
|
||
if (str.eof()) { info.path = ""; return info; }
|
||
if (hashGiven) {
|
||
string s;
|
||
getline(str, s);
|
||
info.hash = parseHash(htSHA256, s);
|
||
getline(str, s);
|
||
if (!string2Int(s, info.narSize)) throw Error("number expected");
|
||
}
|
||
getline(str, info.deriver);
|
||
string s; int n;
|
||
getline(str, s);
|
||
if (!string2Int(s, n)) throw Error("number expected");
|
||
while (n--) {
|
||
getline(str, s);
|
||
info.references.insert(s);
|
||
}
|
||
if (!str || str.eof()) throw Error("missing input");
|
||
return info;
|
||
}
|
||
|
||
|
||
string showPaths(const PathSet & paths)
|
||
{
|
||
string s;
|
||
for (auto & i : paths) {
|
||
if (s.size() != 0) s += ", ";
|
||
s += "‘" + i + "’";
|
||
}
|
||
return s;
|
||
}
|
||
|
||
|
||
void exportPaths(StoreAPI & store, const Paths & paths,
|
||
bool sign, Sink & sink)
|
||
{
|
||
for (auto & i : paths) {
|
||
sink << 1;
|
||
store.exportPath(i, sign, sink);
|
||
}
|
||
sink << 0;
|
||
}
|
||
|
||
|
||
}
|
||
|
||
|
||
#include "local-store.hh"
|
||
#include "serialise.hh"
|
||
#include "remote-store.hh"
|
||
|
||
|
||
namespace nix {
|
||
|
||
|
||
std::shared_ptr<StoreAPI> store;
|
||
|
||
|
||
std::shared_ptr<StoreAPI> openStore(bool reserveSpace)
|
||
{
|
||
if (getEnv("NIX_REMOTE") == "")
|
||
return std::shared_ptr<StoreAPI>(new LocalStore(reserveSpace));
|
||
else
|
||
return std::shared_ptr<StoreAPI>(new RemoteStore());
|
||
}
|
||
|
||
|
||
}
|