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* -u' -> -e'.

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* `--link' / `-l' flag to specify the switch symlink to use (by default, 
  /nix/var/nix/links/current).
This commit is contained in:
Eelco Dolstra 2003-12-21 22:34:41 +00:00
parent 0a753e182a
commit a81b621202
2 changed files with 58 additions and 39 deletions
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3
src/nix-env/help.txt
View file

@ -5,7 +5,7 @@ nix-env [OPTIONS...] [ARGUMENTS...]
Operations:
--install / -i FILE: add a derivation to the user environment
--uninstall / -u: remove a derivation to the user environment
--uninstall / -e: remove a derivation to the user environment
--query / -q: perform a query on an environment or Nix expression
The previous operations take a list of derivation names. The special
@ -27,5 +27,6 @@ Query sources:
Options:
--link / -l LINK: use symlink LINK instead of (...)/current
--verbose / -v: verbose operation (may be repeated)
--keep-failed / -K: keep temporary directories of failed builds

94
src/nix-env/main.cc
View file

@ -6,7 +6,14 @@
#include "help.txt.hh"
typedef void (* Operation) (EvalState & state,
struct Globals
{
Path linkPath;
EvalState state;
};
typedef void (* Operation) (Globals & globals,
Strings opFlags, Strings opArgs);
@ -103,15 +110,10 @@ static Path getLinksDir()
}
static Path getCurrentPath()
void queryInstalled(EvalState & state, DrvInfos & drvs,
const Path & userEnv)
{
return getLinksDir() + "/current";
}
void queryInstalled(EvalState & state, DrvInfos & drvs)
{
Path path = getCurrentPath() + "/manifest";
Path path = userEnv + "/manifest";
if (!pathExists(path)) return; /* not an error, assume nothing installed */
@ -123,7 +125,7 @@ void queryInstalled(EvalState & state, DrvInfos & drvs)
}
Path createLink(Path outPath, Path drvPath)
Path createGeneration(Path outPath, Path drvPath)
{
Path linksDir = getLinksDir();
@ -136,20 +138,20 @@ Path createLink(Path outPath, Path drvPath)
if (s >> n && s.eof() && n >= num) num = n + 1;
}
Path linkPath;
Path generation;
while (1) {
linkPath = (format("%1%/%2%") % linksDir % num).str();
if (symlink(outPath.c_str(), linkPath.c_str()) == 0) break;
generation = (format("%1%/%2%") % linksDir % num).str();
if (symlink(outPath.c_str(), generation.c_str()) == 0) break;
if (errno != EEXIST)
throw SysError(format("creating symlink `%1%'") % linkPath);
throw SysError(format("creating symlink `%1%'") % generation);
/* Somebody beat us to it, retry with a higher number. */
num++;
}
writeStringToFile(linkPath + "-src.id", drvPath);
writeStringToFile(generation + "-src.id", drvPath);
return linkPath;
return generation;
}
@ -169,7 +171,8 @@ void switchLink(Path link, Path target)
}
void createUserEnv(EvalState & state, const DrvInfos & drvs)
void createUserEnv(EvalState & state, const DrvInfos & drvs,
const Path & linkPath)
{
/* Get the environment builder expression. */
Expr envBuilder = parseExprFromFile(nixDataDir + "/nix/corepkgs/buildenv"); /* !!! */
@ -221,8 +224,9 @@ void createUserEnv(EvalState & state, const DrvInfos & drvs)
/* Switch the current user environment to the output path. */
debug(format("switching to new user environment"));
Path linkPath = createLink(topLevelDrv.outPath, topLevelDrv.drvPath);
switchLink(getLinksDir() + "/current", linkPath);
Path generation = createGeneration(
topLevelDrv.outPath, topLevelDrv.drvPath);
switchLink(linkPath, generation);
}
@ -239,7 +243,7 @@ NameMap mapByNames(DrvInfos & drvs)
void installDerivations(EvalState & state,
Path nePath, Strings drvNames)
Path nePath, Strings drvNames, const Path & linkPath)
{
debug(format("installing derivations from `%1%'") % nePath);
@ -267,30 +271,33 @@ void installDerivations(EvalState & state,
/* Add in the already installed derivations. */
DrvInfos installedDrvs;
queryInstalled(state, installedDrvs);
queryInstalled(state, installedDrvs, linkPath);
selectedDrvs.insert(installedDrvs.begin(), installedDrvs.end());
createUserEnv(state, selectedDrvs);
createUserEnv(state, selectedDrvs, linkPath);
}
static void opInstall(EvalState & state,
static void opInstall(Globals & globals,
Strings opFlags, Strings opArgs)
{
if (opFlags.size() > 0)
throw UsageError(format("unknown flags `%1%'") % opFlags.front());
if (opArgs.size() < 1) throw UsageError("Nix file expected");
Path nePath = opArgs.front();
opArgs.pop_front();
installDerivations(state, nePath,
Strings(opArgs.begin(), opArgs.end()));
installDerivations(globals.state, nePath,
Strings(opArgs.begin(), opArgs.end()), globals.linkPath);
}
void uninstallDerivations(EvalState & state, Strings drvNames)
void uninstallDerivations(EvalState & state, Strings drvNames,
Path & linkPath)
{
DrvInfos installedDrvs;
queryInstalled(state, installedDrvs);
queryInstalled(state, installedDrvs, linkPath);
NameMap nameMap = mapByNames(installedDrvs);
@ -304,18 +311,21 @@ void uninstallDerivations(EvalState & state, Strings drvNames)
installedDrvs.erase(j->second);
}
createUserEnv(state, installedDrvs);
createUserEnv(state, installedDrvs, linkPath);
}
static void opUninstall(EvalState & state,
static void opUninstall(Globals & globals,
Strings opFlags, Strings opArgs)
{
uninstallDerivations(state, opArgs);
if (opFlags.size() > 0)
throw UsageError(format("unknown flags `%1%'") % opFlags.front());
uninstallDerivations(globals.state, opArgs, globals.linkPath);
}
static void opQuery(EvalState & state,
static void opQuery(Globals & globals,
Strings opFlags, Strings opArgs)
{
enum { qName, qDrvPath, qStatus } query = qName;
@ -336,14 +346,14 @@ static void opQuery(EvalState & state,
switch (source) {
case sInstalled:
queryInstalled(state, drvs);
queryInstalled(globals.state, drvs, globals.linkPath);
break;
case sAvailable: {
if (opArgs.size() < 1) throw UsageError("Nix file expected");
Path nePath = opArgs.front();
opArgs.pop_front();
loadDerivations(state, nePath, drvs);
loadDerivations(globals.state, nePath, drvs);
break;
}
@ -369,7 +379,7 @@ static void opQuery(EvalState & state,
case qStatus: {
DrvInfos installed;
queryInstalled(state, installed);
queryInstalled(globals.state, installed, globals.linkPath);
for (DrvInfos::iterator i = drvs.begin(); i != drvs.end(); ++i) {
cout << format("%1%%2% %3%\n")
@ -387,9 +397,11 @@ static void opQuery(EvalState & state,
void run(Strings args)
{
EvalState state;
Strings opFlags, opArgs;
Operation op = 0;
Globals globals;
globals.linkPath = getLinksDir() + "/current";
for (Strings::iterator i = args.begin(); i != args.end(); ++i) {
string arg = *i;
@ -398,10 +410,16 @@ void run(Strings args)
if (arg == "--install" || arg == "-i")
op = opInstall;
else if (arg == "--uninstall" || arg == "-u")
else if (arg == "--uninstall" || arg == "-e")
op = opUninstall;
else if (arg == "--query" || arg == "-q")
op = opQuery;
else if (arg == "--link" || arg == "-l") {
++i;
if (i == args.end()) throw UsageError(
format("`%1%' requires an argument") % arg);
globals.linkPath = absPath(*i);
}
else if (arg[0] == '-')
opFlags.push_back(arg);
else
@ -415,9 +433,9 @@ void run(Strings args)
openDB();
op(state, opFlags, opArgs);
op(globals, opFlags, opArgs);
printEvalStats(state);
printEvalStats(globals.state);
}