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* And yet another installation source: the ability to copy user

Browse source 
environment elements from one user environment to another, e.g.,

    $ nix-env -i --from-profile /nix/var/nix/profiles/other-profile aterm
    
  copies the `aterm' component installed in the `other-profile' to the
  user's current profile.
This commit is contained in:
Eelco Dolstra 2005-02-15 10:49:31 +00:00
parent 0083562f75
commit e17910cfb5
1 changed files with 46 additions and 34 deletions
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76
src/nix-env/main.cc
View file

@ -169,12 +169,12 @@ struct AddPos : TermFun
};
static void queryInstalled(EvalState & state, UserEnvElems & elems,
const Path & userEnv)
static UserEnvElems queryInstalled(EvalState & state, const Path & userEnv)
{
Path path = userEnv + "/manifest";
if (!pathExists(path)) return; /* not an error, assume nothing installed */
if (!pathExists(path))
return UserEnvElems(); /* not an error, assume nothing installed */
Expr e = ATreadFromNamedFile(path.c_str());
if (!e) throw Error(format("cannot read Nix expression from `%1%'") % path);
@ -183,7 +183,9 @@ static void queryInstalled(EvalState & state, UserEnvElems & elems,
AddPos addPos;
e = bottomupRewrite(addPos, e);
UserEnvElems elems;
parseDerivations(state, e, elems);
return elems;
}
@ -273,32 +275,15 @@ static void createUserEnv(EvalState & state, const UserEnvElems & elems,
}
static void queryInstSources(EvalState & state,
const InstallSourceInfo & instSource, const Strings & args,
UserEnvElems & elems)
static UserEnvElems filterBySelector(const UserEnvElems & allElems,
const Strings & args)
{
InstallSourceType type = instSource.type;
if (type == srcUnknown && args.size() > 0 && args.front()[0] == '/')
type = srcStorePaths;
switch (type) {
/* Get the available user environment elements from the
derivations specified in a Nix expression, including only
those with names matching any of the names in `args'. */
case srcUnknown:
case srcNixExprDrvs: {
DrvNames selectors = drvNamesFromArgs(args);
/* Load the derivations from the (default or specified)
Nix expression. */
UserEnvElems allElems;
loadDerivations(state, instSource.nixExprPath,
instSource.systemFilter, allElems);
UserEnvElems elems;
/* Filter out the ones we're not interested in. */
for (UserEnvElems::iterator i = allElems.begin();
for (UserEnvElems::const_iterator i = allElems.begin();
i != allElems.end(); ++i)
{
DrvName drvName(i->second.name);
@ -319,6 +304,34 @@ static void queryInstSources(EvalState & state,
throw Error(format("selector `%1%' matches no derivations")
% i->fullName);
return elems;
}
static void queryInstSources(EvalState & state,
const InstallSourceInfo & instSource, const Strings & args,
UserEnvElems & elems)
{
InstallSourceType type = instSource.type;
if (type == srcUnknown && args.size() > 0 && args.front()[0] == '/')
type = srcStorePaths;
switch (type) {
/* Get the available user environment elements from the
derivations specified in a Nix expression, including only
those with names matching any of the names in `args'. */
case srcUnknown:
case srcNixExprDrvs: {
/* Load the derivations from the (default or specified)
Nix expression. */
UserEnvElems allElems;
loadDerivations(state, instSource.nixExprPath,
instSource.systemFilter, allElems);
elems = filterBySelector(allElems, args);
break;
}
@ -373,6 +386,8 @@ static void queryInstSources(EvalState & state,
break;
case srcProfile:
elems = filterBySelector(
queryInstalled(state, instSource.profile), args);
break;
}
}
@ -396,8 +411,7 @@ static void installDerivations(Globals & globals,
/* Add in the already installed derivations, unless they have the
same name as a to-be-installed element. */
UserEnvElems installedElems;
queryInstalled(globals.state, installedElems, profile);
UserEnvElems installedElems = queryInstalled(globals.state, profile);
for (UserEnvElems::iterator i = installedElems.begin();
i != installedElems.end(); ++i)
@ -443,8 +457,7 @@ static void upgradeDerivations(Globals & globals,
name and a higher version number. */
/* Load the currently installed derivations. */
UserEnvElems installedElems;
queryInstalled(globals.state, installedElems, profile);
UserEnvElems installedElems = queryInstalled(globals.state, profile);
/* Fetch all derivations from the input file. */
UserEnvElems availElems;
@ -519,8 +532,7 @@ static void opUpgrade(Globals & globals,
static void uninstallDerivations(Globals & globals, DrvNames & selectors,
Path & profile)
{
UserEnvElems installedElems;
queryInstalled(globals.state, installedElems, profile);
UserEnvElems installedElems = queryInstalled(globals.state, profile);
for (UserEnvElems::iterator i = installedElems.begin();
i != installedElems.end(); ++i)
@ -631,7 +643,7 @@ static void opQuery(Globals & globals,
switch (source) {
case sInstalled:
queryInstalled(globals.state, elems, globals.profile);
elems = queryInstalled(globals.state, globals.profile);
break;
case sAvailable: {
@ -656,7 +668,7 @@ static void opQuery(Globals & globals,
UserEnvElems installed; /* installed paths */
if (printStatus)
queryInstalled(globals.state, installed, globals.profile);
installed = queryInstalled(globals.state, globals.profile);
/* Print the desired columns. */
Table table;