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* nix-env now maintains meta info (from the `meta' derivation

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attribute) about installed packages in user environments.  Thus, an
  operation like `nix-env -q --description' shows useful information
  not only on available packages but also on installed packages.

* nix-env now passes the entire manifest as an argument to the Nix
  expression of the user environment builder (not just a list of
  paths), so that in particular the user environment builder has
  access to the meta attributes.
  
* New operation `--set-flag' in nix-env to change meta info of
  installed packages.  This will be useful to pass per-package
  policies to the user environment builder (e.g., how to resolve
  collision or whether to disable a package (NIX-80)) or upgrade
  policies in nix-env (e.g., that a package should be "masked", that
  is, left untouched by upgrade actions).  Example:

  $ nix-env --set-flag enabled false ghc-6.4
This commit is contained in:
Eelco Dolstra 2007-02-02 01:52:42 +00:00
parent f52de527c7
commit 451dbf687f
6 changed files with 105 additions and 16 deletions
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16
doc/manual/release-notes.xml
View file

@ -14,6 +14,14 @@
<listitem><para>TODO: multi-user support.</para></listitem>
<listitem><para><command>nix-prefetch-url</command> now by default
computes the SHA-256 hash of the file instead of the MD5 hash. In
calls to <function>fetchurl</function> you should pass an
<literal>sha256</literal> attribute instead of
<literal>md5</literal>. You can pass either a hexadecimal or a
base-32 encoding of the hash.</para></listitem>
<listitem><para><command>nix-store</command> has a new operation
<option>--read-log</option> (<option>-l</option>)
@ -51,6 +59,14 @@
<listitem><para>TODO: <option>--argstr</option>.</para></listitem>
<listitem><para>TODO: <command>nix-env</command> now maintains meta
info about installed packages in user
environments.</para></listitem>
<listitem><para>TODO: <command>nix-env</command>
<option>--set-flag</option>.</para></listitem>
<listitem><para>TODO: new built-ins

10
src/libexpr/get-drvs.cc
View file

@ -60,6 +60,16 @@ MetaInfo DrvInfo::queryMetaInfo(EvalState & state) const
}
void DrvInfo::setMetaInfo(const MetaInfo & meta)
{
ATermMap metaAttrs;
for (MetaInfo::const_iterator i = meta.begin(); i != meta.end(); ++i)
metaAttrs.set(toATerm(i->first),
makeAttrRHS(makeStr(i->second), makeNoPos()));
attrs->set(toATerm("meta"), makeAttrs(metaAttrs));
}
/* Cache for already evaluated derivations. Usually putting ATerms in
a STL container is unsafe (they're not scanning for GC roots), but
here it doesn't matter; everything in this set is reachable from

5
src/libexpr/get-drvs.hh
View file

@ -26,6 +26,9 @@ public:
string attrPath; /* path towards the derivation */
string system;
/* !!! these should really be hidden, and setMetaInfo() should
make a copy since the ATermMap can be shared between multiple
DrvInfos. */
boost::shared_ptr<ATermMap> attrs;
string queryDrvPath(EvalState & state) const;
@ -41,6 +44,8 @@ public:
{
outPath = s;
}
void setMetaInfo(const MetaInfo & meta);
};

2
src/libexpr/nixexpr.cc
View file

@ -319,7 +319,7 @@ struct Canonicalise : TermFun
};
Expr canonicaliseExpr(Expr & e)
Expr canonicaliseExpr(Expr e)
{
Canonicalise canonicalise;
return bottomupRewrite(canonicalise, e);

2
src/libexpr/nixexpr.hh
View file

@ -96,7 +96,7 @@ void checkVarDefs(const ATermMap & def, Expr e);
/* Canonicalise a Nix expression by sorting attributes and removing
location information. */
Expr canonicaliseExpr(Expr & e);
Expr canonicaliseExpr(Expr e);
/* Create an expression representing a boolean. */

86
src/nix-env/nix-env.cc
View file

@ -164,7 +164,11 @@ static void createUserEnv(EvalState & state, const DrvInfos & elems,
for (DrvInfos::const_iterator i = elems.begin();
i != elems.end(); ++i)
{
/* Create a pseudo-derivation containing the name, system,
output path, and optionally the derivation path, as well as
the meta attributes. */
Path drvPath = keepDerivations ? i->queryDrvPath(state) : "";
ATermList as = ATmakeList4(
makeBind(toATerm("type"),
makeStr("derivation"), makeNoPos()),
@ -174,10 +178,18 @@ static void createUserEnv(EvalState & state, const DrvInfos & elems,
makeStr(i->system), makeNoPos()),
makeBind(toATerm("outPath"),
makeStr(i->queryOutPath(state)), makeNoPos()));
if (drvPath != "") as = ATinsert(as,
makeBind(toATerm("drvPath"),
makeStr(drvPath), makeNoPos()));
if (i->attrs->get(toATerm("meta"))) as = ATinsert(as,
makeBind(toATerm("meta"),
strictEvalExpr(state, i->attrs->get(toATerm("meta"))),
makeNoPos()));
manifest = ATinsert(manifest, makeAttrs(as));
inputs = ATinsert(inputs, makeStr(i->queryOutPath(state)));
/* This is only necessary when installing store paths, e.g.,
@ -192,13 +204,13 @@ static void createUserEnv(EvalState & state, const DrvInfos & elems,
/* Also write a copy of the list of inputs to the store; we need
it for future modifications of the environment. */
Path manifestFile = store->addTextToStore("env-manifest",
atPrint(makeList(ATreverse(manifest))), references);
atPrint(canonicaliseExpr(makeList(ATreverse(manifest)))), references);
Expr topLevel = makeCall(envBuilder, makeAttrs(ATmakeList3(
makeBind(toATerm("system"),
makeStr(thisSystem), makeNoPos()),
makeBind(toATerm("derivations"),
makeList(ATreverse(inputs)), makeNoPos()),
makeList(ATreverse(manifest)), makeNoPos()),
makeBind(toATerm("manifest"),
makeStr(manifestFile, singleton<PathSet>(manifestFile)), makeNoPos())
)));
@ -506,8 +518,7 @@ typedef enum { utLt, utLeq, utEq, utAlways } UpgradeType;
static void upgradeDerivations(Globals & globals,
const Strings & args, const Path & profile,
UpgradeType upgradeType)
const Strings & args, UpgradeType upgradeType)
{
debug(format("upgrading derivations"));
@ -518,8 +529,8 @@ static void upgradeDerivations(Globals & globals,
/* Load the currently installed derivations. */
PathLocks lock;
lockProfile(lock, profile);
DrvInfos installedElems = queryInstalled(globals.state, profile);
lockProfile(lock, globals.profile);
DrvInfos installedElems = queryInstalled(globals.state, globals.profile);
/* Fetch all derivations from the input file. */
DrvInfos availElems;
@ -577,7 +588,7 @@ static void upgradeDerivations(Globals & globals,
}
createUserEnv(globals.state, newElems,
profile, globals.keepDerivations);
globals.profile, globals.keepDerivations);
}
@ -593,7 +604,55 @@ static void opUpgrade(Globals & globals,
else if (*i == "--always") upgradeType = utAlways;
else throw UsageError(format("unknown flag `%1%'") % *i);
upgradeDerivations(globals, opArgs, globals.profile, upgradeType);
upgradeDerivations(globals, opArgs, upgradeType);
}
static void setMetaFlag(EvalState & state, DrvInfo & drv,
const string & name, const string & value)
{
MetaInfo meta = drv.queryMetaInfo(state);
meta[name] = value;
drv.setMetaInfo(meta);
}
static void opSetFlag(Globals & globals,
Strings opFlags, Strings opArgs)
{
if (opFlags.size() > 0)
throw UsageError(format("unknown flag `%1%'") % opFlags.front());
if (opArgs.size() < 2)
throw UsageError("not enough arguments to `--set-flag'");
Strings::iterator arg = opArgs.begin();
string flagName = *arg++;
string flagValue = *arg++;
DrvNames selectors = drvNamesFromArgs(Strings(arg, opArgs.end()));
/* Load the currently installed derivations. */
PathLocks lock;
lockProfile(lock, globals.profile);
DrvInfos installedElems = queryInstalled(globals.state, globals.profile);
/* Update all matching derivations. */
for (DrvInfos::iterator i = installedElems.begin();
i != installedElems.end(); ++i)
{
DrvName drvName(i->name);
for (DrvNames::iterator j = selectors.begin();
j != selectors.end(); ++j)
if (j->matches(drvName)) {
printMsg(lvlInfo,
format("setting flag on `%1%'") % i->name);
setMetaFlag(globals.state, *i, flagName, flagValue);
break;
}
}
/* Write the new user environment. */
createUserEnv(globals.state, installedElems,
globals.profile, globals.keepDerivations);
}
@ -1167,18 +1226,18 @@ void run(Strings args)
op = opUninstall;
else if (arg == "--upgrade" || arg == "-u")
op = opUpgrade;
else if (arg == "--set-flag")
op = opSetFlag;
else if (arg == "--set")
op = opSet;
else if (arg == "--query" || arg == "-q")
op = opQuery;
else if (arg == "--import" || arg == "-I") /* !!! bad name */
op = opDefaultExpr;
else if (arg == "--profile" || arg == "-p") {
else if (arg == "--profile" || arg == "-p")
globals.profile = absPath(needArg(i, args, arg));
}
else if (arg == "--file" || arg == "-f") {
else if (arg == "--file" || arg == "-f")
globals.instSource.nixExprPath = absPath(needArg(i, args, arg));
}
else if (arg == "--switch-profile" || arg == "-S")
op = opSwitchProfile;
else if (arg == "--switch-generation" || arg == "-G")
@ -1195,9 +1254,8 @@ void run(Strings args)
}
else if (arg == "--preserve-installed" || arg == "-P")
globals.preserveInstalled = true;
else if (arg == "--system-filter") {
else if (arg == "--system-filter")
globals.instSource.systemFilter = needArg(i, args, arg);
}
else if (arg[0] == '-')
opFlags.push_back(arg);
else