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* Improvements to profiles. Generations are now per-profile, e.g., 

default -> default-94-link
  default-82-link -> /nix/store/cc4480...
  default-83-link -> /nix/store/caeec8...
  ...
  default-94-link -> /nix/store/2896ca...
  experimental -> experimental-2-link
  experimental-1-link -> /nix/store/cc4480...
  experimental-2-link -> /nix/store/a3148f...

* `--profile' / `-p' -> `--switch-profile' / `-S'
* `--link' / `-l' -> `--profile' / `-p'
* The default profile is stored in $prefix/var/nix/profiles.
  $prefix/var/nix/links is gone.  Profiles can be stored anywhere.
* The current profile is now referenced from ~/.nix-profile, not
  ~/.nix-userenv.
* The roots to the garbage collector now have extension `.gcroot', not
  `.id'.
This commit is contained in:
Eelco Dolstra 2004-02-06 10:30:20 +00:00
parent d445da7a7b
commit 66e94d3275
10 changed files with 84 additions and 78 deletions
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4
doc/manual/installation.xml
View File

@ -192,9 +192,9 @@ rm -rf /nix/var</screen>
To use Nix, some environment variables should be set. In
particular, <envar>PATH</envar> should contain the directories
<filename><replaceable>prefix</replaceable>/bin</filename> and
<filename>~/.nix-userenv/bin</filename>. The first directory
<filename>~/.nix-profile/bin</filename>. The first directory
contains the Nix tools themselves, while
<filename>~/.nix-userenv</filename> is a symbolic link to the
<filename>~/.nix-profile</filename> is a symbolic link to the
current <emphasis>user environment</emphasis> (an automatically
generated package consisting of symlinks to installed packages).
The simplest way to set the required environment variables is to

10
doc/manual/nix-env.xml
View File

@ -111,14 +111,14 @@
</varlistentry>
<varlistentry>
<term><filename>~/.nix-userenv</filename></term>
<term><filename>~/.nix-profile</filename></term>
<listitem>
<para>
A symbolic link to the user's current user environment.
By default, it points to
<filename><replaceable>prefix</replaceable>/var/nix/links/current</filename>.
A symbolic link to the user's current profile. The
default profile is
<filename><replaceable>prefix</replaceable>/var/nix/profiles/default</filename>.
The <envar>PATH</envar> environment variable should
include <filename>~/.nix-userenv</filename> for the user
include <filename>~/.nix-profile/bin</filename> for the user
environment to be visible to the user.
</para>
</listitem>

40
doc/manual/overview.xml
View File

@ -189,30 +189,32 @@ obtaining list of Nix archives at http://catamaran.labs.cs.uu.nl/dist/nix/nixpkg
it can be used immediately, that is, it now appears in a directory in the
<envar>PATH</envar> environment variable. Specifically,
<envar>PATH</envar> includes the entry
<filename><replaceable>prefix</replaceable>/var/nix/links/current/bin</filename>,
<filename><replaceable>prefix</replaceable>/var/nix/profiles/default/bin</filename>,
where
<filename><replaceable>prefix</replaceable>/var/nix/links/current</filename>
<filename><replaceable>prefix</replaceable>/var/nix/profiles/default</filename>
is just a symlink to the current user environment:
</para>
<screen>
$ ls -l /nix/var/nix/links/
$ ls -l /nix/var/nix/profiles/
...
lrwxrwxrwx 1 eelco ... 15 -> /nix/store/1871...12b0-user-environment
lrwxrwxrwx 1 eelco ... 16 -> /nix/store/59ba...df6b-user-environment
lrwxrwxrwx 1 eelco ... current -> /nix/var/nix/links/16</screen>
lrwxrwxrwx 1 eelco ... default-15-link -> /nix/store/1871...12b0-user-environment
lrwxrwxrwx 1 eelco ... default-16-link -> /nix/store/59ba...df6b-user-environment
lrwxrwxrwx 1 eelco ... default -> default-16-link</screen>
<para>
That is, <filename>current</filename> in this example is a link to
<filename>16</filename>, which is the current user environment. Before
the installation, it pointed to <filename>15</filename>. Note that this
means that you can atomically roll-back to the previous user environment
by pointing the symlink <filename>current</filename> at
<filename>15</filename> again. This also shows that operations such as
installation are atomic in the Nix system: any arbitrarily complex
set of installation, uninstallation, or upgrade actions eventually boil
down to the single operation of pointing a symlink somewhere else (which
can be implemented atomically in Unix).
That is, <filename>default</filename> in this example is a link
to <filename>default-16-link</filename>, which is the current
user environment. Before the installation, it pointed to
<filename>default-15-link</filename>. Note that this means that
you can atomically roll-back to the previous user environment by
pointing the symlink <filename>default</filename> at
<filename>default-15-link</filename> again. This also shows
that operations such as installation are atomic in the Nix
system: any arbitrarily complex set of installation,
uninstallation, or upgrade actions eventually boil down to the
single operation of pointing a symlink somewhere else (which can
be implemented atomically in Unix).
</para>
<para>
@ -221,15 +223,15 @@ lrwxrwxrwx 1 eelco ... current -> /nix/var/nix/links/16</screen>
</para>
<screen>
$ ls -l /nix/var/nix/links/16/bin
$ ls -l /nix/var/nix/profiles/default-16-link/bin
lrwxrwxrwx 1 eelco ... MozillaFirebird -> /nix/store/35f8...4ae6-MozillaFirebird-0.7/bin/MozillaFirebird
lrwxrwxrwx 1 eelco ... svn -> /nix/store/3829...fb5d-subversion-0.32.1/bin/svn
...</screen>
<para>
Note that, e.g., <filename>svn</filename> =
<filename>/nix/var/nix/links/current/bin/svn</filename> =
<filename>/nix/var/nix/links/16/bin/svn</filename> =
<filename>/nix/var/nix/profiles/default/bin/svn</filename> =
<filename>/nix/var/nix/profiles/default-16-link/bin/svn</filename> =
<filename>/nix/store/59ba...df6b-user-environment/bin/svn</filename> =
<filename>/nix/store/3829...fb5d-subversion-0.32.1/bin/svn</filename>.
</para>

2
doc/manual/quick-start.xml
View File

@ -93,7 +93,7 @@ $ nix-env -iBf nixpkgs-<replaceable>version</replaceable>/ hello MozillaFirebird
<screen>
$ which hello
/home/eelco/.nix-userenv/bin/hello
/home/eelco/.nix-profile/bin/hello
$ hello
Hello, world!
$ MozillaFirebird

4
scripts/nix-collect-garbage.in
View File

@ -3,7 +3,7 @@
use strict;
use IPC::Open2;
my $linkdir = "@localstatedir@/nix/links";
my $linkdir = "@localstatedir@/nix/profiles";
my $storedir = "@prefix@/store";
my %alive;
@ -24,7 +24,7 @@ closedir DIR;
my @roots;
foreach my $link (@links) {
$link = $linkdir . "/" . $link;
next if (!($link =~ /.id$/));
next if (!($link =~ /.gcroot$/));
open ROOT, "<$link" or die "cannot open $link: $!";
my $root = <ROOT>;
chomp $root;

4
scripts/nix-profile.sh.in
View File

@ -1,9 +1,9 @@
if test -n "$HOME"; then
NIX_LINK="$HOME/.nix-userenv"
NIX_LINK="$HOME/.nix-profile"
if ! test -L "$NIX_LINK"; then
echo "creating $NIX_LINK"
_NIX_DEF_LINK=@localstatedir@/nix/links/current
_NIX_DEF_LINK=@localstatedir@/nix/profiles/default
ln -s "$_NIX_DEF_LINK" "$NIX_LINK"
fi

3
src/nix-env/Makefile.am
View File

@ -14,3 +14,6 @@ main.o: help.txt.hh
AM_CXXFLAGS = \
-I.. -I../../externals/inst/include -I../libutil -I../libstore \
-I../libexpr -I../libmain
install-data-local:
$(INSTALL) -d $(DESTDIR)$(localstatedir)/nix/profiles

4
src/nix-env/help.txt
View File

@ -12,7 +12,7 @@ Operations:
The previous operations take a list of derivation names. The special
name `*' may be used to indicate all derivations.
--profile / -p [FILE]: switch to specified user environment
--switch-profile / -S [FILE]: switch to specified profile
--import / -I FILE: set default Nix expression
--version: output version information
@ -31,7 +31,7 @@ Query sources:
Options:
--link / -l LINK: use symlink LINK instead of (...)/current
--profile / -p LINK: use specified profile instead of target of ~/.nix-profile
--file / -f FILE: use Nix expression FILE for installation, etc.
--verbose / -v: verbose operation (may be repeated)
--keep-failed / -K: keep temporary directories of failed builds

88
src/nix-env/main.cc
View File

@ -10,7 +10,7 @@
struct Globals
{
Path linkPath;
Path profile;
Path nixExprPath;
EvalState state;
};
@ -116,12 +116,6 @@ static Path getHomeDir()
}
static Path getLinksDir()
{
return canonPath(nixStateDir + "/links");
}
static Path getDefNixExprPath()
{
return getHomeDir() + "/.nix-defexpr";
@ -143,23 +137,30 @@ void queryInstalled(EvalState & state, DrvInfos & drvs,
}
Path createGeneration(Path outPath, Path drvPath)
Path createGeneration(Path profile, Path outPath, Path drvPath)
{
Path linksDir = getLinksDir();
Path profileDir = dirOf(profile);
string profileName = baseNameOf(profile);
unsigned int num = 0;
Strings names = readDirectory(linksDir);
Strings names = readDirectory(profileDir);
for (Strings::iterator i = names.begin(); i != names.end(); ++i) {
istringstream s(*i);
unsigned int n;
if (s >> n && s.eof() && n >= num) num = n + 1;
if (string(*i, 0, profileName.size() + 1) != profileName + "-") continue;
string s = string(*i, profileName.size() + 1);
int p = s.find("-link");
if (p == string::npos) continue;
istringstream str(string(s, 0, p));
unsigned int n;
if (str >> n && str.eof() && n >= num) num = n + 1;
}
Path generation;
Path generation, gcrootSrc;
while (1) {
generation = (format("%1%/%2%") % linksDir % num).str();
Path prefix = (format("%1%-%2%") % profile % num).str();
generation = prefix + "-link";
gcrootSrc = prefix + "-src.gcroot";
if (symlink(outPath.c_str(), generation.c_str()) == 0) break;
if (errno != EEXIST)
throw SysError(format("creating symlink `%1%'") % generation);
@ -167,7 +168,7 @@ Path createGeneration(Path outPath, Path drvPath)
num++;
}
writeStringToFile(generation + "-src.id", drvPath);
writeStringToFile(gcrootSrc, drvPath);
return generation;
}
@ -175,6 +176,9 @@ Path createGeneration(Path outPath, Path drvPath)
void switchLink(Path link, Path target)
{
/* Hacky. */
if (dirOf(target) == dirOf(link)) target = baseNameOf(target);
Path tmp = canonPath(dirOf(link) + "/.new_" + baseNameOf(link));
if (symlink(target.c_str(), tmp.c_str()) != 0)
throw SysError(format("creating symlink `%1%'") % tmp);
@ -190,7 +194,7 @@ void switchLink(Path link, Path target)
void createUserEnv(EvalState & state, const DrvInfos & drvs,
const Path & linkPath)
const Path & profile)
{
/* Get the environment builder expression. */
Expr envBuilder = parseExprFromFile(state,
@ -243,9 +247,9 @@ void createUserEnv(EvalState & state, const DrvInfos & drvs,
/* Switch the current user environment to the output path. */
debug(format("switching to new user environment"));
Path generation = createGeneration(
Path generation = createGeneration(profile,
topLevelDrv.outPath, topLevelDrv.drvPath);
switchLink(linkPath, generation);
switchLink(profile, generation);
}
@ -380,7 +384,7 @@ static DrvNames drvNamesFromArgs(const Strings & opArgs)
static void installDerivations(EvalState & state,
Path nePath, DrvNames & selectors, const Path & linkPath)
Path nePath, DrvNames & selectors, const Path & profile)
{
debug(format("installing derivations from `%1%'") % nePath);
@ -415,10 +419,10 @@ static void installDerivations(EvalState & state,
/* Add in the already installed derivations. */
DrvInfos installedDrvs;
queryInstalled(state, installedDrvs, linkPath);
queryInstalled(state, installedDrvs, profile);
selectedDrvs.insert(installedDrvs.begin(), installedDrvs.end());
createUserEnv(state, selectedDrvs, linkPath);
createUserEnv(state, selectedDrvs, profile);
}
@ -431,12 +435,12 @@ static void opInstall(Globals & globals,
DrvNames drvNames = drvNamesFromArgs(opArgs);
installDerivations(globals.state, globals.nixExprPath,
drvNames, globals.linkPath);
drvNames, globals.profile);
}
static void upgradeDerivations(EvalState & state,
Path nePath, DrvNames & selectors, const Path & linkPath)
Path nePath, DrvNames & selectors, const Path & profile)
{
debug(format("upgrading derivations from `%1%'") % nePath);
@ -447,7 +451,7 @@ static void upgradeDerivations(EvalState & state,
/* Load the currently installed derivations. */
DrvInfos installedDrvs;
queryInstalled(state, installedDrvs, linkPath);
queryInstalled(state, installedDrvs, profile);
/* Fetch all derivations from the input file. */
DrvInfos availDrvs;
@ -496,7 +500,7 @@ static void upgradeDerivations(EvalState & state,
newDrvs.insert(*bestDrv);
}
createUserEnv(state, newDrvs, linkPath);
createUserEnv(state, newDrvs, profile);
}
@ -510,15 +514,15 @@ static void opUpgrade(Globals & globals,
DrvNames drvNames = drvNamesFromArgs(opArgs);
upgradeDerivations(globals.state, globals.nixExprPath,
drvNames, globals.linkPath);
drvNames, globals.profile);
}
static void uninstallDerivations(EvalState & state, DrvNames & selectors,
Path & linkPath)
Path & profile)
{
DrvInfos installedDrvs;
queryInstalled(state, installedDrvs, linkPath);
queryInstalled(state, installedDrvs, profile);
for (DrvInfos::iterator i = installedDrvs.begin();
i != installedDrvs.end(); ++i)
@ -533,7 +537,7 @@ static void uninstallDerivations(EvalState & state, DrvNames & selectors,
}
}
createUserEnv(state, installedDrvs, linkPath);
createUserEnv(state, installedDrvs, profile);
}
@ -545,7 +549,7 @@ static void opUninstall(Globals & globals,
DrvNames drvNames = drvNamesFromArgs(opArgs);
uninstallDerivations(globals.state, drvNames, globals.linkPath);
uninstallDerivations(globals.state, drvNames, globals.profile);
}
@ -576,7 +580,7 @@ static void opQuery(Globals & globals,
switch (source) {
case sInstalled:
queryInstalled(globals.state, drvs, globals.linkPath);
queryInstalled(globals.state, drvs, globals.profile);
break;
case sAvailable: {
@ -612,7 +616,7 @@ static void opQuery(Globals & globals,
case qStatus: {
DrvInfos installed;
queryInstalled(globals.state, installed, globals.linkPath);
queryInstalled(globals.state, installed, globals.profile);
PathSet installedPaths; /* output paths of installed drvs */
for (DrvInfos::iterator i = installed.begin();
@ -644,11 +648,11 @@ static void opSwitchProfile(Globals & globals,
if (opArgs.size() > 1)
throw UsageError(format("`--profile' takes at most one argument"));
Path linkPath =
absPath(opArgs.size() == 0 ? globals.linkPath : opArgs.front());
Path linkPathFinal = getHomeDir() + "/.nix-userenv";
Path profile =
absPath(opArgs.size() == 0 ? globals.profile : opArgs.front());
Path profileLink = getHomeDir() + "/.nix-userenv";
switchLink(linkPathFinal, linkPath);
switchLink(profileLink, profile);
}
@ -676,7 +680,7 @@ void run(Strings args)
Operation op = 0;
Globals globals;
globals.linkPath = getLinksDir() + "/current";
globals.profile = canonPath(nixStateDir + "/profiles/default");
globals.nixExprPath = getDefNixExprPath();
for (Strings::iterator i = args.begin(); i != args.end(); ++i) {
@ -694,11 +698,11 @@ void run(Strings args)
op = opQuery;
else if (arg == "--import" || arg == "-I") /* !!! bad name */
op = opDefaultExpr;
else if (arg == "--link" || arg == "-l") {
else if (arg == "--profile" || arg == "-p") {
++i;
if (i == args.end()) throw UsageError(
format("`%1%' requires an argument") % arg);
globals.linkPath = absPath(*i);
globals.profile = absPath(*i);
}
else if (arg == "--file" || arg == "-f") {
++i;
@ -706,7 +710,7 @@ void run(Strings args)
format("`%1%' requires an argument") % arg);
globals.nixExprPath = absPath(*i);
}
else if (arg == "--profile" || arg == "-p")
else if (arg == "--switch-profile" || arg == "-S")
op = opSwitchProfile;
else if (arg[0] == '-')
opFlags.push_back(arg);

3
src/nix-store/Makefile.am
View File

@ -15,9 +15,6 @@ AM_CXXFLAGS = \
install-data-local:
$(INSTALL) -d $(DESTDIR)$(localstatedir)/nix
$(INSTALL) -d $(DESTDIR)$(localstatedir)/nix/db
$(INSTALL) -d $(DESTDIR)$(localstatedir)/nix/links
rm -f $(DESTDIR)$(prefix)/current
ln -sf $(localstatedir)/nix/links/current $(DESTDIR)$(prefix)/current
$(INSTALL) -d $(DESTDIR)$(localstatedir)/log/nix
$(INSTALL) -d $(DESTDIR)$(prefix)/store
# $(bindir)/nix-store --init