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* New operation `nix-env --set' which sets a user environment to a

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single derivation specified by the argument.  This is useful when we
  want to have a profile for a single derivation, such as a server
  configuration.  Then we can just say (e.g.)

  $ nix-env -p /.../server-profile -f server.nix --set -A server

  We can't do queries or upgrades on such a profile, but we can do
  rollbacks.  The advantage over -i is that we don't have to worry
  about other packages having been installed in the profile
  previously; --set gets rid of them.
This commit is contained in:
Eelco Dolstra 2006-12-12 19:06:02 +00:00
parent 1a7e88bbd9
commit 7ace29dae7
3 changed files with 31 additions and 0 deletions
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27
src/nix-env/nix-env.cc
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@ -596,6 +596,31 @@ static void opUpgrade(Globals & globals,
}
static void opSet(Globals & globals,
Strings opFlags, Strings opArgs)
{
if (opFlags.size() > 0)
throw UsageError(format("unknown flag `%1%'") % opFlags.front());
DrvInfos elems;
queryInstSources(globals.state, globals.instSource, opArgs, elems, true);
if (elems.size() != 1)
throw Error("--set requires exactly one derivation");
DrvInfo & drv(elems.front());
if (drv.queryDrvPath(globals.state) != "")
store->buildDerivations(singleton<PathSet>(drv.queryDrvPath(globals.state)));
else
store->ensurePath(drv.queryOutPath(globals.state));
debug(format("switching to new user environment"));
Path generation = createGeneration(globals.profile, drv.queryOutPath(globals.state));
switchLink(globals.profile, generation);
}
static void uninstallDerivations(Globals & globals, DrvNames & selectors,
Path & profile)
{
@ -1152,6 +1177,8 @@ void run(Strings args)
op = opUninstall;
else if (arg == "--upgrade" || arg == "-u")
op = opUpgrade;
else if (arg == "--set")
op = opSet;
else if (arg == "--query" || arg == "-q")
op = opQuery;
else if (arg == "--import" || arg == "-I") /* !!! bad name */