* Channels. These allow you to stay current with an evolving set of
Nix expressions.
To subscribe to a channel (needs to be done only once):
nix-channel --add \
http://catamaran.labs.cs.uu.nl/dist/nix/channels/nixpkgs-unstable
This just adds the given URL to ~/.nix-channels (which can also be
edited manually).
To update from all channels:
nix-channel --update
This fetches the latest expressions and pulls cache manifests. The
default Nix expression (~/.nix-defexpr) is made to point to the
conjunction of the expressions downloaded from all channels.
So to update all installed derivations in the current user
environment:
nix-channel --update
nix-env --upgrade '*'
If you are really courageous, you can put this in a cronjob or
something.
You can subscribe to multiple channels. It is not entirely clear
what happens when there are name clashes between derivations from
different channels. From nix-env/main.cc it appears that the one
with the lowest (highest?) hash will be used, which is pretty
meaningless.
This commit is contained in:
Eelco Dolstra
parent
f79e9c2d22
commit
21655a70f5
10 changed files with 194 additions and 52 deletions
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@ -140,6 +140,7 @@ AC_CONFIG_FILES([Makefile
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corepkgs/fetchurl/Makefile
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corepkgs/nar/Makefile
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corepkgs/buildenv/Makefile
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corepkgs/channels/Makefile
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doc/Makefile
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doc/manual/Makefile
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])
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@ -1 +1 @@
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SUBDIRS = fetchurl nar buildenv
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SUBDIRS = fetchurl nar buildenv channels
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11
corepkgs/channels/Makefile.am
Normal file
11
corepkgs/channels/Makefile.am
Normal file
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@ -0,0 +1,11 @@
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all-local: unpack.sh
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install-exec-local:
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$(INSTALL) -d $(DESTDIR)$(datadir)/nix/corepkgs
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$(INSTALL) -d $(DESTDIR)$(datadir)/nix/corepkgs/channels
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$(INSTALL_DATA) unpack.nix $(DESTDIR)$(datadir)/nix/corepkgs/channels
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$(INSTALL_PROGRAM) unpack.sh $(DESTDIR)$(datadir)/nix/corepkgs/channels
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include ../../substitute.mk
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EXTRA_DIST = default.nix unpack.sh.in
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7
corepkgs/channels/unpack.nix
Normal file
7
corepkgs/channels/unpack.nix
Normal file
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@ -0,0 +1,7 @@
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{system, inputs}:
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derivation {
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name = "channels";
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builder = ./unpack.sh;
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inherit system inputs;
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}
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24
corepkgs/channels/unpack.sh.in
Normal file
24
corepkgs/channels/unpack.sh.in
Normal file
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@ -0,0 +1,24 @@
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#! @shell@ -e
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export PATH=/bin:/usr/bin # !!! impure
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mkdir $out
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mkdir $out/tmp
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cd $out/tmp
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expr=$out/default.nix
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echo '[' > $expr
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nr=0
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for i in $inputs; do
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echo "unpacking $i"
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@bunzip2@ < $i | tar xvf -
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mv * ../$nr # !!! hacky
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echo "(import ./$nr)" >> $expr
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nr=$(($nr + 1))
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done
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echo ']' >> $expr
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cd ..
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rmdir tmp
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@ -1,8 +1,8 @@
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{system, url, md5}: derivation {
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{system, url, md5}:
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derivation {
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name = baseNameOf (toString url);
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system = system;
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builder = ./builder.sh;
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url = url;
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md5 = md5;
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id = md5;
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inherit system url md5;
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}
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@ -1,6 +1,6 @@
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bin_SCRIPTS = nix-collect-garbage \
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nix-pull nix-push nix-prefetch-url \
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nix-install-package
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nix-install-package nix-channel
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noinst_SCRIPTS = nix-profile.sh
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@ -20,4 +20,5 @@ include ../substitute.mk
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EXTRA_DIST = nix-collect-garbage.in \
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nix-pull.in nix-push.in nix-profile.sh.in \
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nix-prefetch-url.in nix-install-package.in \
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nix-channel.in \
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prebuilts.conf readmanifest.pm.in
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115
scripts/nix-channel.in
Executable file
115
scripts/nix-channel.in
Executable file
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@ -0,0 +1,115 @@
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#! @perl@ -w
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use strict;
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# Figure out the name of the `.nix-channels' file to use.
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my $home = $ENV{"HOME"};
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die '$HOME not set' unless defined $home;
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my $channelsList = "$home/.nix-channels";
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my @channels;
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# Reads the list of channels from the file $channelsList;
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sub readChannels {
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return if (!-f $channelsList);
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open CHANNELS, "<$channelsList" or die "cannot open `$channelsList'";
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while (<CHANNELS>) {
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chomp;
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push @channels, $_;
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}
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close CHANNELS;
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}
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# Writes the list of channels to the file $channelsList;
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sub writeChannels {
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open CHANNELS, ">$channelsList" or die "cannot open `$channelsList'";
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foreach my $url (@channels) {
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print CHANNELS "$url\n";
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}
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close CHANNELS;
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}
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# Adds a channel to the file $channelsList;
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sub addChannel {
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my $url = shift;
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readChannels;
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foreach my $url2 (@channels) {
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return if $url eq $url2;
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}
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push @channels, $url;
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writeChannels;
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}
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# Fetch Nix expressions and pull cache manifests from the subscribed
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# channels.
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sub update {
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readChannels;
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# Pull cache manifests.
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foreach my $url (@channels) {
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print "pulling cache manifest from `$url'\n";
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system "@bindir@/nix-pull '$url'/MANIFEST";
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die "cannot pull cache manifest from `$url'" if ($? != 0);
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}
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# Create a Nix expression that fetches and unpacks the channel Nix
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# expressions.
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my $nixExpr = "[";
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foreach my $url (@channels) {
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my $fullURL = "$url/nixexprs.tar.bz2";
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my $hash = `@bindir@/nix-prefetch-url '$fullURL' 2> /dev/null`
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or die "cannot fetch `$fullURL'";
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chomp $hash;
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# !!! escaping
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$nixExpr .= "((import @datadir@/nix/corepkgs/fetchurl) " .
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"{url = $fullURL; md5 = \"$hash\"; system = \"@system@\";}) "
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}
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$nixExpr .= "]";
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$nixExpr =
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"(import @datadir@/nix/corepkgs/channels/unpack.nix) " .
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"{inputs = $nixExpr; system = \"@system@\";}";
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# Instantiate and realise it.
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my $storeExpr = `echo '$nixExpr' | @bindir@/nix-instantiate -`
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or die "cannot instantiate Nix expression";
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chomp $storeExpr;
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my $outPath = `nix-store -qnfB '$storeExpr'`
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or die "cannot realise store expression";
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chomp $outPath;
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# Make it the default Nix expression for `nix-env'.
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system "@bindir@/nix-env --import '$outPath'";
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die "cannot pull set default Nix expression to `$outPath'" if ($? != 0);
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}
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while (scalar @ARGV) {
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my $arg = shift @ARGV;
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if ($arg eq "--add") {
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die "syntax: nix-channel --add URL" if (scalar @ARGV != 1);
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addChannel (shift @ARGV);
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last;
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}
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elsif ($arg eq "--update") {
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die "syntax: nix-channel --update" if (scalar @ARGV != 0);
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update;
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last;
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}
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else {
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die "unknown argument `$arg'";
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}
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}
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@ -1,56 +1,37 @@
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#! @perl@ -w
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#! @shell@ -e
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use strict;
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use IPC::Open2;
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url=$1
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my $url = shift @ARGV;
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defined $url or die;
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if test -z "$url"; then
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echo "syntax: nix-prefetch-url URL" >&2
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exit 1
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fi
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print "fetching $url...\n";
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# !!! race? should be relatively safe, `svn export' barfs if $tmpPath exists.
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tmpPath1=@storedir@/nix-prefetch-url-$$
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my $out = "@storedir@/nix-prefetch-url-$$";
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# Perform the checkout.
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@curl@ --fail --location --max-redirs 20 "$url" > $tmpPath1
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system "@curl@ --fail --location --max-redirs 20 \"$url\" > \"$out\"";
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$? == 0 or die "unable to fetch $url";
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# Compute the hash.
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hash=$(@bindir@/nix-hash --flat $tmpPath1)
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echo "hash is $hash" >&2
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my $hash=`@bindir@/nix-hash --flat $out`;
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$? == 0 or die "unable to hash $out";
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chomp $hash;
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# Rename it so that the fetchsvn builder can find it.
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tmpPath2=@storedir@/nix-prefetch-url-$hash
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test -e $tmpPath2 || mv $tmpPath1 $tmpPath2 # !!! race
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print "file has hash $hash\n";
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# Create a Nix expression that does a fetchsvn.
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storeExpr=$( \
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echo "(import @datadir@/nix/corepkgs/fetchurl) \
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{url = $url; md5 = \"$hash\"; system = \"@system@\";}" \
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| nix-instantiate -)
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my $out2 = "@storedir@/nix-prefetch-url-$hash";
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rename $out, $out2;
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# Realise it.
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finalPath=$(nix-store -qnB --force-realise $storeExpr)
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# Create a Nix expression.
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my $nixexpr =
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"(import @datadir@/nix/corepkgs/fetchurl) " .
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"{url = $url; md5 = \"$hash\"; system = \"@system@\";}";
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echo "path is $finalPath" >&2
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#print STDERR "expr: $nixexpr\n";
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rm -rf $tmpPath2 || true
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# Instantiate a Nix expression.
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#print STDERR "instantiating Nix expression...\n";
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my $pid = open2(\*READ, \*WRITE, "@bindir@/nix-instantiate -")
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or die "cannot run nix-instantiate";
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print WRITE $nixexpr;
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close WRITE;
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my $drvpath = <READ>;
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chomp $drvpath;
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waitpid $pid, 0;
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$? == 0 or die "nix-instantiate failed";
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# Run Nix.
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#print STDERR "realising store expression $drvpath...\n";
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system "@bindir@/nix-store --realise $drvpath > /dev/null";
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$? == 0 or die "realisation failed";
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my $path = `@bindir@/nix-store -qn $drvpath`;
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$? == 0 or die "query failed";
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print "path is $path";
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unlink $out2;
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echo $hash
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@ -12,7 +12,9 @@ my $manifest = "$tmpdir/MANIFEST";
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END { unlink $manifest; unlink $nixfile; rmdir $tmpdir; }
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my $curl = "@curl@ --fail --silent ${ENV{'CURL_FLAGS'}}";
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my $curl = "@curl@ --fail --silent";
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my $extraCurlFlags = ${ENV{'CURL_FLAGS'}};
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$curl = "$curl $extraCurlFlags" if defined $extraCurlFlags;
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# Parse the command line.
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Loading…
Add table
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Reference in a new issue