* By default, `nix-env -i' now deletes previously installed
derivations with names matching the derivations being installed. The option `--preserve-installed / -P' overrides this behaviour.
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@ -183,6 +183,10 @@
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<arg choice='plain'><option>--install</option></arg>
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<arg choice='plain'><option>-i</option></arg>
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</group>
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<group choice='opt'>
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<arg choice='plain'><option>--preserve-installed</option></arg>
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<arg choice='plain'><option>-P</option></arg>
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</group>
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<arg choice='plain' rep='repeat'><replaceable>drvnames</replaceable></arg>
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</cmdsynopsis>
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</refsection>
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@ -197,6 +201,35 @@
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in the active Nix expression are added.
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</para>
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<para>
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Currently installed derivations with a name equal to the name
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of a derivation being added are removed unless the option
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<option>--preserve-installed</option> is specified.
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</para>
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</refsection>
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<refsection>
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<title>Flags</title>
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<variablelist>
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<varlistentry>
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<term><option>--preserve-installed</option> / <option>-P</option></term>
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<listitem>
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<para>
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Do not remove derivations with a name matching one of
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the derivations being installed. Usually, trying to
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have two versions of the same package installed in the
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same generation of a profile will lead to an error in
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building the generation, due to file name clashes
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between the two versions. However, this is not the case
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for all packages.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsection>
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<refsection>
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@ -204,7 +237,11 @@
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<screen>
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$ nix-env --install gcc-3.3.2 <lineannotation>(install specific version)</lineannotation>
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installing `gcc-3.3.2'
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uninstalling `gcc-3.1' <lineannotation>(previously installed version is removed)</lineannotation>
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$ nix-env --install gcc <lineannotation>(just pick any version)</lineannotation>
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$ nix-env -f ~/foo.nix -i '*' <lineannotation>(install everything in <filename>foo.nix</filename>)</lineannotation></screen>
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</refsection>
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@ -17,6 +17,7 @@ struct Globals
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Path nixExprPath;
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EvalState state;
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bool dryRun;
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bool preserveInstalled;
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};
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@ -225,7 +226,7 @@ void createUserEnv(EvalState & state, const DrvInfos & drvs,
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static void installDerivations(EvalState & state,
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Path nePath, DrvNames & selectors, const Path & profile,
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bool dryRun)
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bool dryRun, bool preserveInstalled)
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{
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debug(format("installing derivations from `%1%'") % nePath);
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@ -235,6 +236,7 @@ static void installDerivations(EvalState & state,
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/* Filter out the ones we're not interested in. */
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DrvInfos selectedDrvs;
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StringSet selectedNames;
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for (DrvInfos::iterator i = availDrvs.begin();
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i != availDrvs.end(); ++i)
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{
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@ -247,6 +249,7 @@ static void installDerivations(EvalState & state,
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format("installing `%1%'") % i->second.name);
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j->hits++;
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selectedDrvs.insert(*i);
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selectedNames.insert(drvName.name);
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}
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}
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}
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@ -261,7 +264,18 @@ static void installDerivations(EvalState & state,
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/* Add in the already installed derivations. */
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DrvInfos installedDrvs;
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queryInstalled(state, installedDrvs, profile);
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selectedDrvs.insert(installedDrvs.begin(), installedDrvs.end());
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for (DrvInfos::iterator i = installedDrvs.begin();
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i != installedDrvs.end(); ++i)
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{
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DrvName drvName(i->second.name);
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if (!preserveInstalled &&
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selectedNames.find(drvName.name) != selectedNames.end())
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printMsg(lvlInfo,
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format("uninstalling `%1%'") % i->second.name);
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else
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selectedDrvs.insert(*i);
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}
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if (dryRun) return;
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DrvNames drvNames = drvNamesFromArgs(opArgs);
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installDerivations(globals.state, globals.nixExprPath,
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drvNames, globals.profile, globals.dryRun);
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drvNames, globals.profile, globals.dryRun,
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globals.preserveInstalled);
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}
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Globals globals;
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globals.nixExprPath = getDefNixExprPath();
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globals.dryRun = false;
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globals.preserveInstalled = false;
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for (Strings::iterator i = args.begin(); i != args.end(); ++i) {
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string arg = *i;
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printMsg(lvlInfo, "(dry run; not doing anything)");
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globals.dryRun = true;
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}
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else if (arg == "--preserve-installed" || arg == "-P")
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globals.preserveInstalled = true;
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else if (arg[0] == '-')
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opFlags.push_back(arg);
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else
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