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Merge branch 'master' into no-manifests

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This commit is contained in:
Eelco Dolstra 2012-07-26 15:14:33 -04:00
commit 8c79100839
50 changed files with 343 additions and 307 deletions
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4
.gitignore vendored
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@ -79,13 +79,9 @@ Makefile.in
/src/libexpr/parser-tab.cc
/src/libexpr/parser-tab.hh
/src/libexpr/parser-tab.output
/src/libexpr/nixexpr-ast.hh
/src/libexpr/nixexpr-ast.cc
/src/libexpr/nix.tbl
# /src/libstore/
/src/libstore/derivations-ast.cc
/src/libstore/derivations-ast.hh
/src/libstore/schema.sql.hh
# /src/nix-env/

17
configure.ac
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@ -115,6 +115,23 @@ AC_CHECK_HEADERS([sys/mount.h], [], [],
])
# Check for lutimes, optionally used for changing the mtime of
# symlinks.
AC_CHECK_FUNCS([lutimes])
# Check whether the store optimiser can optimise symlinks.
AC_MSG_CHECKING([whether it is possible to create a link to a symlink])
ln -s bla tmp_link
if ln tmp_link tmp_link2 2> /dev/null; then
AC_MSG_RESULT(yes)
AC_DEFINE(CAN_LINK_SYMLINK, 1, [Whether link() works on symlinks.])
else
AC_MSG_RESULT(no)
fi
rm -f tmp_link tmp_link2
# Check for <locale>.
AC_LANG_PUSH(C++)
AC_CHECK_HEADERS([locale])

3
corepkgs/Makefile.am
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@ -1,6 +1,7 @@
all-local: config.nix
files = nar.nix buildenv.nix buildenv.pl unpack-channel.nix unpack-channel.sh derivation.nix fetchurl.nix
files = nar.nix buildenv.nix buildenv.pl unpack-channel.nix unpack-channel.sh derivation.nix fetchurl.nix \
imported-drv-to-derivation.nix
install-exec-local:
$(INSTALL) -d $(DESTDIR)$(datadir)/nix/corepkgs

21
corepkgs/imported-drv-to-derivation.nix Normal file
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@ -0,0 +1,21 @@
attrs @ { drvPath, outputs, ... }:
let
commonAttrs = (builtins.listToAttrs outputsList) //
{ all = map (x: x.value) outputsList;
inherit drvPath;
type = "derivation";
};
outputToAttrListElement = outputName:
{ name = outputName;
value = commonAttrs // {
outPath = builtins.getAttr outputName attrs;
inherit outputName;
};
};
outputsList = map outputToAttrListElement outputs;
in (builtins.head outputsList).value

15
doc/manual/conf-file.xml
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@ -357,7 +357,20 @@ build-use-chroot = /dev /proc /bin</programlisting>
<literal>true</literal>.</para></listitem>
</varlistentry>
<varlistentry><term><literal>auto-optimise-store</literal></term>
<listitem><para>If set to <literal>true</literal> (the default),
Nix automatically detects files in the store that have identical
contents, and replaces them with hard links to a single copy.
This saves disk space. If set to <literal>false</literal>, you
can still run <command>nix-store --optimise</command> to get rid
of duplicate files.</para></listitem>
</varlistentry>
</variablelist>
</para>

2
doc/manual/release-notes.xml
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@ -8,7 +8,7 @@
<!--==================================================================-->
<section xml:id="ssec-relnotes-1.1"><title>Release 1.1 (TBA)</title>
<section xml:id="ssec-relnotes-1.1"><title>Release 1.1 (July 18, 2012)</title>
<para>This release has the following improvements:</para>

4
release.nix
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@ -156,10 +156,6 @@ let
rpm_fedora13x86_64 = makeRPM_x86_64 (diskImageFunsFun: diskImageFunsFun.fedora13x86_64) 50;
rpm_fedora16i386 = makeRPM_i686 (diskImageFuns: diskImageFuns.fedora16i386) 50;
rpm_fedora16x86_64 = makeRPM_x86_64 (diskImageFunsFun: diskImageFunsFun.fedora16x86_64) 50;
rpm_opensuse103i386 = makeRPM_i686 (diskImageFuns: diskImageFuns.opensuse103i386) 40;
rpm_opensuse110i386 = makeRPM_i686 (diskImageFuns: diskImageFuns.opensuse110i386) 50;
rpm_opensuse110x86_64 = makeRPM_x86_64 (diskImageFuns: diskImageFuns.opensuse110x86_64) 50;
deb_debian60i386 = makeDeb_i686 (diskImageFuns: diskImageFuns.debian60i386) 50;

4
scripts/nix-build.in
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@ -123,6 +123,10 @@ EOF
elsif ($arg eq "--show-trace") {
push @instArgs, $arg;
}
elsif ($arg eq "-") {
@exprs = ("-");
}
elsif ($arg eq "--verbose" or substr($arg, 0, 2) eq "-v") {
push @buildArgs, $arg;

6
scripts/nix-profile.sh.in
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@ -19,9 +19,9 @@ fi
export PATH="$HOME/.nix-profile/bin:$PATH"
# Subscribe the root user to the NixOS channel by default.
# Subscribe the root user to the Nixpkgs channel by default.
if [ "$USER" = root -a ! -e $HOME/.nix-channels ]; then
echo "http://nixos.org/releases/nixos/channels/nixos-unstable nixos" > $HOME/.nix-channels
echo "http://nixos.org/releases/nixos/channels/nixpkgs-unstable nixpkgs" > $HOME/.nix-channels
fi
# Create the per-user garbage collector roots directory.
@ -43,7 +43,7 @@ fi
# Set up secure multi-user builds: non-root users build through the
# Nix daemon.
if test "$USER" != root; then
if [ "$USER" != root -a -e @localstatedir@/nix/daemon-socket/socket ]; then
export NIX_REMOTE=daemon
else
unset NIX_REMOTE

9
src/libexpr/attr-path.hh
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@ -1,20 +1,13 @@
#ifndef __ATTR_PATH_H
#define __ATTR_PATH_H
#pragma once
#include "eval.hh"
#include <string>
#include <map>
namespace nix {
void findAlongAttrPath(EvalState & state, const string & attrPath,
Bindings & autoArgs, Expr * e, Value & v);
}
#endif /* !__ATTR_PATH_H */

7
src/libexpr/common-opts.hh
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@ -1,9 +1,7 @@
#ifndef __COMMON_OPTS_H
#define __COMMON_OPTS_H
#pragma once
#include "eval.hh"
namespace nix {
/* Some common option parsing between nix-env and nix-instantiate. */
@ -17,6 +15,3 @@ bool parseSearchPathArg(const string & arg, Strings::iterator & i,
Path lookupFileArg(EvalState & state, string s);
}
#endif /* !__COMMON_OPTS_H */

7
src/libexpr/eval-inline.hh
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@ -1,5 +1,4 @@
#ifndef __EVAL_INLINE_H
#define __EVAL_INLINE_H
#pragma once
#include "eval.hh"
@ -8,7 +7,6 @@
namespace nix {
LocalNoInlineNoReturn(void throwEvalError(const char * s))
{
throw EvalError(s);
@ -55,7 +53,4 @@ inline void EvalState::forceList(Value & v)
throwTypeError("value is %1% while a list was expected", showType(v));
}
}
#endif /* !__EVAL_INLINE_H */

6
src/libexpr/eval.hh
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@ -1,5 +1,4 @@
#ifndef __EVAL_H
#define __EVAL_H
#pragma once
#include "value.hh"
#include "nixexpr.hh"
@ -256,6 +255,3 @@ string showType(const Value & v);
}
#endif /* !__EVAL_H */

6
src/libexpr/get-drvs.hh
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@ -1,5 +1,4 @@
#ifndef __GET_DRVS_H
#define __GET_DRVS_H
#pragma once
#include "eval.hh"
@ -83,6 +82,3 @@ void getDerivations(EvalState & state, Value & v, const string & pathPrefix,
}
#endif /* !__GET_DRVS_H */

11
src/libexpr/names.hh
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@ -1,12 +1,9 @@
#ifndef __NAMES_H
#define __NAMES_H
#pragma once
#include "types.hh"
namespace nix {
struct DrvName
{
string fullName;
@ -19,15 +16,9 @@ struct DrvName
bool matches(DrvName & n);
};
typedef list<DrvName> DrvNames;
int compareVersions(const string & v1, const string & v2);
DrvNames drvNamesFromArgs(const Strings & opArgs);
}
#endif /* !__NAMES_H */

6
src/libexpr/nixexpr.hh
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@ -1,5 +1,4 @@
#ifndef __NIXEXPR_H
#define __NIXEXPR_H
#pragma once
#include "value.hh"
#include "symbol-table.hh"
@ -290,6 +289,3 @@ struct StaticEnv
}
#endif /* !__NIXEXPR_H */

26
src/libexpr/primops.cc
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@ -65,7 +65,31 @@ static void prim_import(EvalState & state, Value * * args, Value & v)
}
}
state.evalFile(path, v);
if (isStorePath(path) && store->isValidPath(path) && isDerivation(path)) {
Derivation drv = parseDerivation(readFile(path));
Value & w = *state.allocValue();
state.mkAttrs(w, 1 + drv.outputs.size());
mkString(*state.allocAttr(w, state.sDrvPath), path, singleton<PathSet>("=" + path));
state.mkList(*state.allocAttr(w, state.symbols.create("outputs")), drv.outputs.size());
unsigned int outputs_index = 0;
Value * outputsVal = w.attrs->find(state.symbols.create("outputs"))->value;
foreach (DerivationOutputs::iterator, i, drv.outputs) {
mkString(*state.allocAttr(w, state.symbols.create(i->first)),
i->second.path, singleton<PathSet>("!" + i->first + "!" + path));
mkString(*(outputsVal->list.elems[outputs_index++] = state.allocValue()),
i->first);
}
w.attrs->sort();
Value fun;
state.mkThunk_(fun,
state.parseExprFromFile(state.findFile("nix/imported-drv-to-derivation.nix")));
state.forceFunction(fun);
mkApp(v, fun, w);
state.forceAttrs(v);
} else {
state.evalFile(path, v);
}
}

5
src/libexpr/symbol-table.hh
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@ -1,5 +1,4 @@
#ifndef __SYMBOL_TABLE_H
#define __SYMBOL_TABLE_H
#pragma once
#include "config.h"
@ -88,5 +87,3 @@ public:
};
}
#endif /* !__SYMBOL_TABLE_H */

5
src/libexpr/value-to-xml.hh
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@ -1,5 +1,4 @@
#ifndef __VALUE_TO_XML_H
#define __VALUE_TO_XML_H
#pragma once
#include "nixexpr.hh"
#include "eval.hh"
@ -13,5 +12,3 @@ void printValueAsXML(EvalState & state, bool strict, bool location,
Value & v, std::ostream & out, PathSet & context);
}
#endif /* !__VALUE_TO_XML_H */

5
src/libexpr/value.hh
View File

@ -1,5 +1,4 @@
#ifndef __VALUE_H
#define __VALUE_H
#pragma once
#include "symbol-table.hh"
@ -151,5 +150,3 @@ void mkPath(Value & v, const char * s);
}
#endif /* !__VALUE_H */

6
src/libmain/shared.hh
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@ -1,5 +1,4 @@
#ifndef __SHARED_H
#define __SHARED_H
#pragma once
#include "util.hh"
@ -54,6 +53,3 @@ extern int exitCode;
extern char * * argvSaved;
}
#endif /* !__SHARED_H */

7
src/libstore/build.cc
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@ -1533,7 +1533,7 @@ void DerivationGoal::startBuilder()
/* Create a temporary directory where the build will take
place. */
tmpDir = createTempDir("", "nix-build-" + baseNameOf(drvPath), false, false);
tmpDir = createTempDir("", "nix-build-" + baseNameOf(drvPath), false, false, 0700);
/* For convenience, set an environment pointing to the top build
directory. */
@ -2099,6 +2099,8 @@ void DerivationGoal::computeClosure()
if (allowed.find(*i) == allowed.end())
throw BuildError(format("output is not allowed to refer to path `%1%'") % *i);
}
worker.store.optimisePath(path); // FIXME: combine with scanForReferences()
}
/* Register each output path as valid, and register the sets of
@ -2182,6 +2184,7 @@ void DerivationGoal::deleteTmpDir(bool force)
% drvPath % tmpDir);
if (buildUser.enabled() && !amPrivileged())
getOwnership(tmpDir);
chmod(tmpDir.c_str(), 0755);
}
else
deletePathWrapped(tmpDir);
@ -2562,6 +2565,8 @@ void SubstitutionGoal::finished()
HashResult hash = hashPath(htSHA256, storePath);
worker.store.optimisePath(storePath); // FIXME: combine with hashPath()
ValidPathInfo info2;
info2.path = storePath;
info2.hash = hash.first;

6
src/libstore/derivations.hh
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@ -1,5 +1,4 @@
#ifndef __DERIVATIONS_H
#define __DERIVATIONS_H
#pragma once
#include <map>
@ -81,6 +80,3 @@ typedef std::map<Path, Hash> DrvHashes;
extern DrvHashes drvHashes;
}
#endif /* !__DERIVATIONS_H */

37
src/libstore/gc.cc
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@ -436,6 +436,8 @@ bool LocalStore::tryToDelete(GCState & state, const Path & path)
{
checkInterrupt();
if (path == linksDir) return true;
struct stat st;
if (lstat(path.c_str(), &st)) {
if (errno == ENOENT) return true;
@ -569,6 +571,37 @@ bool LocalStore::tryToDelete(GCState & state, const Path & path)
}
/* Unlink all files in /nix/store/.links that have a link count of 1,
which indicates that there are no other links and so they can be
safely deleted. FIXME: race condition with optimisePath(): we
might see a link count of 1 just before optimisePath() increases
the link count. */
void LocalStore::removeUnusedLinks()
{
AutoCloseDir dir = opendir(linksDir.c_str());
if (!dir) throw SysError(format("opening directory `%1%'") % linksDir);
struct dirent * dirent;
while (errno = 0, dirent = readdir(dir)) {
checkInterrupt();
string name = dirent->d_name;
if (name == "." || name == "..") continue;
Path path = linksDir + "/" + name;
struct stat st;
if (lstat(path.c_str(), &st) == -1)
throw SysError(format("statting `%1%'") % path);
if (st.st_nlink != 1) continue;
printMsg(lvlTalkative, format("deleting unused link `%1%'") % path);
if (unlink(path.c_str()) == -1)
throw SysError(format("deleting `%1%'") % path);
}
}
void LocalStore::collectGarbage(const GCOptions & options, GCResults & results)
{
GCState state(results);
@ -682,6 +715,10 @@ void LocalStore::collectGarbage(const GCOptions & options, GCResults & results)
released. */
foreach (PathSet::iterator, i, state.invalidated)
deleteGarbage(state, *i);
/* Clean up the links directory. */
printMsg(lvlError, format("deleting unused links..."));
removeUnusedLinks();
}

6
src/libstore/globals.hh
View File

@ -1,5 +1,4 @@
#ifndef __GLOBALS_H
#define __GLOBALS_H
#pragma once
#include "types.hh"
@ -118,6 +117,3 @@ void setDefaultsFromEnvironment();
}
#endif /* !__GLOBALS_H */

32
src/libstore/local-store.cc
View File

@ -12,6 +12,7 @@
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <unistd.h>
#include <utime.h>
#include <fcntl.h>
@ -208,6 +209,7 @@ LocalStore::LocalStore(bool reserveSpace)
/* Create missing state directories if they don't already exist. */
createDirs(nixStore);
createDirs(linksDir = nixStore + "/.links");
Path profilesDir = nixStateDir + "/profiles";
createDirs(nixStateDir + "/profiles");
createDirs(nixStateDir + "/temproots");
@ -444,7 +446,7 @@ void canonicalisePathMetaData(const Path & path, bool recurse)
throw SysError(format("changing owner of `%1%' to %2%")
% path % geteuid());
}
if (!S_ISLNK(st.st_mode)) {
/* Mask out all type related bits. */
@ -458,14 +460,20 @@ void canonicalisePathMetaData(const Path & path, bool recurse)
throw SysError(format("changing mode of `%1%' to %2$o") % path % mode);
}
if (st.st_mtime != mtimeStore) {
struct utimbuf utimbuf;
utimbuf.actime = st.st_atime;
utimbuf.modtime = mtimeStore;
if (utime(path.c_str(), &utimbuf) == -1)
throw SysError(format("changing modification time of `%1%'") % path);
}
}
if (st.st_mtime != mtimeStore) {
struct timeval times[2];
times[0].tv_sec = st.st_atime;
times[0].tv_usec = 0;
times[1].tv_sec = mtimeStore;
times[1].tv_usec = 0;
#if HAVE_LUTIMES
if (lutimes(path.c_str(), times) == -1)
#else
if (!S_ISLNK(st.st_mode) && utimes(path.c_str(), times) == -1)
#endif
throw SysError(format("changing modification time of `%1%'") % path);
}
if (recurse && S_ISDIR(st.st_mode)) {
@ -1134,6 +1142,8 @@ Path LocalStore::addToStoreFromDump(const string & dump, const string & name,
hash.second = dump.size();
} else
hash = hashPath(htSHA256, dstPath);
optimisePath(dstPath); // FIXME: combine with hashPath()
ValidPathInfo info;
info.path = dstPath;
@ -1188,6 +1198,8 @@ Path LocalStore::addTextToStore(const string & name, const string & s,
canonicalisePathMetaData(dstPath);
HashResult hash = hashPath(htSHA256, dstPath);
optimisePath(dstPath);
ValidPathInfo info;
info.path = dstPath;
@ -1423,6 +1435,8 @@ Path LocalStore::importPath(bool requireSignature, Source & source)
/* !!! if we were clever, we could prevent the hashPath()
here. */
HashResult hash = hashPath(htSHA256, dstPath);
optimisePath(dstPath); // FIXME: combine with hashPath()
ValidPathInfo info;
info.path = dstPath;

17
src/libstore/local-store.hh
View File

@ -1,5 +1,4 @@
#ifndef __LOCAL_STORE_H
#define __LOCAL_STORE_H
#pragma once
#include <string>
@ -86,6 +85,8 @@ private:
typedef std::map<Path, RunningSubstituter> RunningSubstituters;
RunningSubstituters runningSubstituters;
Path linksDir;
public:
@ -168,8 +169,11 @@ public:
/* Optimise the disk space usage of the Nix store by hard-linking
files with the same contents. */
void optimiseStore(bool dryRun, OptimiseStats & stats);
void optimiseStore(OptimiseStats & stats);
/* Optimise a single store path. */
void optimisePath(const Path & path);
/* Check the integrity of the Nix store. */
void verifyStore(bool checkContents);
@ -260,6 +264,8 @@ private:
int openGCLock(LockType lockType);
void removeUnusedLinks();
void startSubstituter(const Path & substituter,
RunningSubstituter & runningSubstituter);
@ -268,6 +274,8 @@ private:
Path importPath(bool requireSignature, Source & source);
void checkDerivationOutputs(const Path & drvPath, const Derivation & drv);
void optimisePath_(OptimiseStats & stats, const Path & path);
};
@ -302,6 +310,3 @@ void deletePathWrapped(const Path & path,
void deletePathWrapped(const Path & path);
}
#endif /* !__LOCAL_STORE_H */

6
src/libstore/misc.hh
View File

@ -1,5 +1,4 @@
#ifndef __MISC_H
#define __MISC_H
#pragma once
#include "derivations.hh"
@ -35,6 +34,3 @@ void queryMissing(StoreAPI & store, const PathSet & targets,
}
#endif /* !__MISC_H */

222
src/libstore/optimise-store.cc
View File

@ -1,6 +1,7 @@
#include "util.hh"
#include "local-store.hh"
#include "immutable.hh"
#include "globals.hh"
#include <sys/types.h>
#include <sys/stat.h>
@ -12,9 +13,6 @@
namespace nix {
typedef std::map<Hash, std::pair<Path, ino_t> > HashToPath;
static void makeWritable(const Path & path)
{
struct stat st;
@ -51,140 +49,152 @@ struct MakeImmutable
};
static void hashAndLink(bool dryRun, HashToPath & hashToPath,
OptimiseStats & stats, const Path & path)
void LocalStore::optimisePath_(OptimiseStats & stats, const Path & path)
{
struct stat st;
if (lstat(path.c_str(), &st))
throw SysError(format("getting attributes of path `%1%'") % path);
if (S_ISDIR(st.st_mode)) {
Strings names = readDirectory(path);
foreach (Strings::iterator, i, names)
optimisePath_(stats, path + "/" + *i);
return;
}
/* We can hard link regular files and maybe symlinks. */
if (!S_ISREG(st.st_mode)
#if CAN_LINK_SYMLINK
x
&& !S_ISLNK(st.st_mode)
#endif
) return;
/* Sometimes SNAFUs can cause files in the Nix store to be
modified, in particular when running programs as root under
NixOS (example: $fontconfig/var/cache being modified). Skip
those files. */
those files. FIXME: check the modification time. */
if (S_ISREG(st.st_mode) && (st.st_mode & S_IWUSR)) {
printMsg(lvlError, format("skipping suspicious writable file `%1%'") % path);
return;
}
/* We can hard link regular files and symlinks. */
if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode)) {
/* Hash the file. Note that hashPath() returns the hash over the
NAR serialisation, which includes the execute bit on the file.
Thus, executable and non-executable files with the same
contents *won't* be linked (which is good because otherwise the
permissions would be screwed up).
/* Hash the file. Note that hashPath() returns the hash over
the NAR serialisation, which includes the execute bit on
the file. Thus, executable and non-executable files with
the same contents *won't* be linked (which is good because
otherwise the permissions would be screwed up).
Also note that if `path' is a symlink, then we're hashing the
contents of the symlink (i.e. the result of readlink()), not
the contents of the target (which may not even exist). */
Hash hash = hashPath(htSHA256, path).first;
stats.totalFiles++;
printMsg(lvlDebug, format("`%1%' has hash `%2%'") % path % printHash(hash));
Also note that if `path' is a symlink, then we're hashing
the contents of the symlink (i.e. the result of
readlink()), not the contents of the target (which may not
even exist). */
Hash hash = hashPath(htSHA256, path).first;
stats.totalFiles++;
printMsg(lvlDebug, format("`%1%' has hash `%2%'") % path % printHash(hash));
/* Check if this is a known hash. */
Path linkPath = linksDir + "/" + printHash32(hash);
std::pair<Path, ino_t> prevPath = hashToPath[hash];
if (prevPath.first == "") {
hashToPath[hash] = std::pair<Path, ino_t>(path, st.st_ino);
return;
}
/* Yes! We've seen a file with the same contents. Replace
the current file with a hard link to that file. */
stats.sameContents++;
if (prevPath.second == st.st_ino) {
printMsg(lvlDebug, format("`%1%' is already linked to `%2%'") % path % prevPath.first);
return;
}
if (!dryRun) {
printMsg(lvlTalkative, format("linking `%1%' to `%2%'") % path % prevPath.first);
if (!pathExists(linkPath)) {
/* Nope, create a hard link in the links directory. */
makeMutable(path);
MakeImmutable mk1(path);
Path tempLink = (format("%1%.tmp-%2%-%3%")
% path % getpid() % rand()).str();
if (link(path.c_str(), linkPath.c_str()) == -1)
throw SysError(format("cannot link `%1%' to `%2%'") % linkPath % path);
/* Make the containing directory writable, but only if
it's not the store itself (we don't want or need to
mess with its permissions). */
bool mustToggle = !isStorePath(path);
if (mustToggle) makeWritable(dirOf(path));
/* When we're done, make the directory read-only again and
reset its timestamp back to 0. */
MakeReadOnly makeReadOnly(mustToggle ? dirOf(path) : "");
/* If ‘prevPath’ is immutable, we can't create hard links
to it, so make it mutable first (and make it immutable
again when we're done). We also have to make ‘path’
mutable, otherwise rename() will fail to delete it. */
makeMutable(prevPath.first);
MakeImmutable mk1(prevPath.first);
makeMutable(path);
MakeImmutable mk2(path);
if (link(prevPath.first.c_str(), tempLink.c_str()) == -1) {
if (errno == EMLINK) {
/* Too many links to the same file (>= 32000 on
most file systems). This is likely to happen
with empty files. Just start over, creating
links to the current file. */
printMsg(lvlInfo, format("`%1%' has maximum number of links") % prevPath.first);
hashToPath[hash] = std::pair<Path, ino_t>(path, st.st_ino);
return;
}
throw SysError(format("cannot link `%1%' to `%2%'")
% tempLink % prevPath.first);
}
/* Atomically replace the old file with the new hard link. */
if (rename(tempLink.c_str(), path.c_str()) == -1) {
if (errno == EMLINK) {
/* Some filesystems generate too many links on the
rename, rather than on the original link.
(Probably it temporarily increases the st_nlink
field before decreasing it again.) */
printMsg(lvlInfo, format("`%1%' has maximum number of links") % prevPath.first);
hashToPath[hash] = std::pair<Path, ino_t>(path, st.st_ino);
/* Unlink the temp link. */
if (unlink(tempLink.c_str()) == -1)
printMsg(lvlError, format("unable to unlink `%1%'") % tempLink);
return;
}
throw SysError(format("cannot rename `%1%' to `%2%'")
% tempLink % path);
}
} else
printMsg(lvlTalkative, format("would link `%1%' to `%2%'") % path % prevPath.first);
stats.filesLinked++;
stats.bytesFreed += st.st_size;
stats.blocksFreed += st.st_blocks;
return;
}
if (S_ISDIR(st.st_mode)) {
Strings names = readDirectory(path);
foreach (Strings::iterator, i, names)
hashAndLink(dryRun, hashToPath, stats, path + "/" + *i);
/* Yes! We've seen a file with the same contents. Replace the
current file with a hard link to that file. */
struct stat stLink;
if (lstat(linkPath.c_str(), &stLink))
throw SysError(format("getting attributes of path `%1%'") % linkPath);
stats.sameContents++;
if (st.st_ino == stLink.st_ino) {
printMsg(lvlDebug, format("`%1%' is already linked to `%2%'") % path % linkPath);
return;
}
printMsg(lvlTalkative, format("linking `%1%' to `%2%'") % path % linkPath);
Path tempLink = (format("%1%/.tmp-link-%2%-%3%")
% nixStore % getpid() % rand()).str();
/* Make the containing directory writable, but only if it's not
the store itself (we don't want or need to mess with its
permissions). */
bool mustToggle = !isStorePath(path);
if (mustToggle) makeWritable(dirOf(path));
/* When we're done, make the directory read-only again and reset
its timestamp back to 0. */
MakeReadOnly makeReadOnly(mustToggle ? dirOf(path) : "");
/* If ‘linkPath’ is immutable, we can't create hard links to it,
so make it mutable first (and make it immutable again when
we're done). We also have to make ‘path’ mutable, otherwise
rename() will fail to delete it. */
makeMutable(linkPath);
MakeImmutable mk1(linkPath);
makeMutable(path);
MakeImmutable mk2(path);
if (link(linkPath.c_str(), tempLink.c_str()) == -1) {
if (errno == EMLINK) {
/* Too many links to the same file (>= 32000 on most file
systems). This is likely to happen with empty files.
Just shrug and ignore. */
printMsg(lvlInfo, format("`%1%' has maximum number of links") % linkPath);
return;
}
throw SysError(format("cannot link `%1%' to `%2%'") % tempLink % linkPath);
}
/* Atomically replace the old file with the new hard link. */
if (rename(tempLink.c_str(), path.c_str()) == -1) {
if (errno == EMLINK) {
/* Some filesystems generate too many links on the rename,
rather than on the original link. (Probably it
temporarily increases the st_nlink field before
decreasing it again.) */
printMsg(lvlInfo, format("`%1%' has maximum number of links") % linkPath);
/* Unlink the temp link. */
if (unlink(tempLink.c_str()) == -1)
printMsg(lvlError, format("unable to unlink `%1%'") % tempLink);
return;
}
throw SysError(format("cannot rename `%1%' to `%2%'") % tempLink % path);
}
stats.filesLinked++;
stats.bytesFreed += st.st_size;
stats.blocksFreed += st.st_blocks;
}
void LocalStore::optimiseStore(bool dryRun, OptimiseStats & stats)
void LocalStore::optimiseStore(OptimiseStats & stats)
{
HashToPath hashToPath;
PathSet paths = queryAllValidPaths();
foreach (PathSet::iterator, i, paths) {
addTempRoot(*i);
if (!isValidPath(*i)) continue; /* path was GC'ed, probably */
startNest(nest, lvlChatty, format("hashing files in `%1%'") % *i);
hashAndLink(dryRun, hashToPath, stats, *i);
optimisePath_(stats, *i);
}
}
void LocalStore::optimisePath(const Path & path)
{
if (queryBoolSetting("auto-optimise-store", true)) {
OptimiseStats stats;
optimisePath_(stats, path);
}
}

6
src/libstore/pathlocks.hh
View File

@ -1,5 +1,4 @@
#ifndef __PATHLOCKS_H
#define __PATHLOCKS_H
#pragma once
#include "types.hh"
@ -44,6 +43,3 @@ bool pathIsLockedByMe(const Path & path);
}
#endif /* !__PATHLOCKS_H */

5
src/libstore/references.hh
View File

@ -1,5 +1,4 @@
#ifndef __REFERENCES_H
#define __REFERENCES_H
#pragma once
#include "types.hh"
#include "hash.hh"
@ -10,5 +9,3 @@ PathSet scanForReferences(const Path & path, const PathSet & refs,
HashResult & hash);
}
#endif /* !__REFERENCES_H */

6
src/libstore/remote-store.hh
View File

@ -1,5 +1,4 @@
#ifndef __REMOTE_STORE_H
#define __REMOTE_STORE_H
#pragma once
#include <string>
@ -103,6 +102,3 @@ private:
}
#endif /* !__REMOTE_STORE_H */

6
src/libstore/store-api.hh
View File

@ -1,5 +1,4 @@
#ifndef __STOREAPI_H
#define __STOREAPI_H
#pragma once
#include "hash.hh"
#include "serialise.hh"
@ -362,6 +361,3 @@ MakeError(BuildError, Error) /* denotes a permanent build failure */
}
#endif /* !__STOREAPI_H */

7
src/libstore/worker-protocol.hh
View File

@ -1,6 +1,4 @@
#ifndef __WORKER_PROTOCOL_H
#define __WORKER_PROTOCOL_H
#pragma once
namespace nix {
@ -67,6 +65,3 @@ template<class T> T readStorePaths(Source & from);
}
#endif /* !__WORKER_PROTOCOL_H */

6
src/libutil/archive.hh
View File

@ -1,5 +1,4 @@
#ifndef __ARCHIVE_H
#define __ARCHIVE_H
#pragma once
#include "types.hh"
#include "serialise.hh"
@ -74,6 +73,3 @@ void restorePath(const Path & path, Source & source);
}
#endif /* !__ARCHIVE_H */

6
src/libutil/hash.hh
View File

@ -1,5 +1,4 @@
#ifndef __HASH_H
#define __HASH_H
#pragma once
#include "types.hh"
#include "serialise.hh"
@ -109,6 +108,3 @@ public:
}
#endif /* !__HASH_H */

5
src/libutil/immutable.hh
View File

@ -1,5 +1,4 @@
#ifndef __IMMUTABLE_H
#define __IMMUTABLE_H
#pragma once
#include <types.hh>
@ -15,5 +14,3 @@ void makeImmutable(const Path & path);
void makeMutable(const Path & path);
}
#endif /* !__IMMUTABLE_H */

6
src/libutil/serialise.hh
View File

@ -1,5 +1,4 @@
#ifndef __SERIALISE_H
#define __SERIALISE_H
#pragma once
#include "types.hh"
@ -130,6 +129,3 @@ MakeError(SerialisationError, Error)
}
#endif /* !__SERIALISE_H */

6
src/libutil/types.hh
View File

@ -1,5 +1,4 @@
#ifndef __TYPES_H
#define __TYPES_H
#pragma once
#include <string>
#include <list>
@ -74,6 +73,3 @@ typedef enum {
}
#endif /* !__TYPES_H */

4
src/libutil/util.cc
View File

@ -380,7 +380,7 @@ static Path tempName(Path tmpRoot, const Path & prefix, bool includePid,
Path createTempDir(const Path & tmpRoot, const Path & prefix,
bool includePid, bool useGlobalCounter)
bool includePid, bool useGlobalCounter, mode_t mode)
{
static int globalCounter = 0;
int localCounter = 0;
@ -389,7 +389,7 @@ Path createTempDir(const Path & tmpRoot, const Path & prefix,
while (1) {
checkInterrupt();
Path tmpDir = tempName(tmpRoot, prefix, includePid, counter);
if (mkdir(tmpDir.c_str(), 0777) == 0) {
if (mkdir(tmpDir.c_str(), mode) == 0) {
/* Explicitly set the group of the directory. This is to
work around around problems caused by BSD's group
ownership semantics (directories inherit the group of

8
src/libutil/util.hh
View File

@ -1,5 +1,4 @@
#ifndef __UTIL_H
#define __UTIL_H
#pragma once
#include "types.hh"
@ -89,7 +88,7 @@ void makePathReadOnly(const Path & path);
/* Create a temporary directory. */
Path createTempDir(const Path & tmpRoot = "", const Path & prefix = "nix",
bool includePid = true, bool useGlobalCounter = true);
bool includePid = true, bool useGlobalCounter = true, mode_t mode = 0755);
/* Create a directory and all its parents, if necessary. Returns the
list of created directories, in order of creation. */
@ -333,6 +332,3 @@ void ignoreException();
}
#endif /* !__UTIL_H */

6
src/libutil/xml-writer.hh
View File

@ -1,5 +1,4 @@
#ifndef __XML_WRITER_H
#define __XML_WRITER_H
#pragma once
#include <iostream>
#include <string>
@ -70,6 +69,3 @@ public:
}
#endif /* !__XML_WRITER_H */

6
src/nix-env/profiles.hh
View File

@ -1,5 +1,4 @@
#ifndef __PROFILES_H
#define __PROFILES_H
#pragma once
#include "types.hh"
#include "pathlocks.hh"
@ -54,6 +53,3 @@ void lockProfile(PathLocks & lock, const Path & profile);
string optimisticLockProfile(const Path & profile);
}
#endif /* !__PROFILES_H */

9
src/nix-env/user-env.hh
View File

@ -1,5 +1,4 @@
#ifndef __USER_ENV_H
#define __USER_ENV_H
#pragma once
#include "get-drvs.hh"
@ -12,9 +11,3 @@ bool createUserEnv(EvalState & state, DrvInfos & elems,
const string & lockToken);
}
#endif /* !__USER_ENV_H */

5
src/nix-store/dotgraph.hh
View File

@ -1,5 +1,4 @@
#ifndef __DOTGRAPH_H
#define __DOTGRAPH_H
#pragma once
#include "types.hh"
@ -8,5 +7,3 @@ namespace nix {
void printDotGraph(const PathSet & roots);
}
#endif /* !__DOTGRAPH_H */

10
src/nix-store/nix-store.cc
View File

@ -746,18 +746,12 @@ static void showOptimiseStats(OptimiseStats & stats)
files with the same contents. */
static void opOptimise(Strings opFlags, Strings opArgs)
{
if (!opArgs.empty())
if (!opArgs.empty() || !opFlags.empty())
throw UsageError("no arguments expected");
bool dryRun = false;
foreach (Strings::iterator, i, opFlags)
if (*i == "--dry-run") dryRun = true;
else throw UsageError(format("unknown flag `%1%'") % *i);
OptimiseStats stats;
try {
ensureLocalStore().optimiseStore(dryRun, stats);
ensureLocalStore().optimiseStore(stats);
} catch (...) {
showOptimiseStats(stats);
throw;

5
src/nix-store/xmlgraph.hh
View File

@ -1,5 +1,4 @@
#ifndef __XMLGRAPH_H
#define __XMLGRAPH_H
#pragma once
#include "types.hh"
@ -8,5 +7,3 @@ namespace nix {
void printXmlGraph(const PathSet & roots);
}
#endif /* !__XMLGRAPH_H */

2
tests/Makefile.am
View File

@ -9,7 +9,7 @@ TESTS = init.sh hash.sh lang.sh add.sh simple.sh dependencies.sh \
gc-runtime.sh install-package.sh check-refs.sh filter-source.sh \
remote-store.sh export.sh export-graph.sh negative-caching.sh \
binary-patching.sh timeout.sh secure-drv-outputs.sh nix-channel.sh \
multiple-outputs.sh import-derivation.sh fetchurl.sh
multiple-outputs.sh import-derivation.sh fetchurl.sh optimise-store.sh
XFAIL_TESTS =

26
tests/optimise-store.sh Normal file
View File

@ -0,0 +1,26 @@
source common.sh
clearStore
outPath1=$(echo 'with import ./config.nix; mkDerivation { name = "foo1"; builder = builtins.toFile "builder" "mkdir $out; echo hello > $out/foo"; }' | nix-build - --no-out-link)
outPath2=$(echo 'with import ./config.nix; mkDerivation { name = "foo2"; builder = builtins.toFile "builder" "mkdir $out; echo hello > $out/foo"; }' | nix-build - --no-out-link)
inode1="$(perl -e "print ((lstat('$outPath1/foo'))[1])")"
inode2="$(perl -e "print ((lstat('$outPath2/foo'))[1])")"
if [ "$inode1" != "$inode2" ]; then
echo "inodes do not match"
exit 1
fi
nlink="$(perl -e "print ((lstat('$outPath1/foo'))[3])")"
if [ "$nlink" != 3 ]; then
echo "link count incorrect"
exit 1
fi
nix-store --gc
if [ -n "$(ls $NIX_STORE_DIR/.links)" ]; then
echo ".links directory not empty after GC"
exit 1
fi

2
version
View File

@ -1 +1 @@
1.1
1.2