forked from lix-project/lix
nix-channel improvements
"nix-channel --add" now accepts a second argument: the channel name. This allows channels to have a nicer name than (say) nixpkgs_unstable. If no name is given, it defaults to the last component of the URL (with "-unstable" or "-stable" removed). Also, channels are now stored in a profile (/nix/var/nix/profiles/per-user/$USER/channels). One advantage of this is that it allows rollbacks (e.g. if "nix-channel --update" gives an undesirable update).
This commit is contained in:
Eelco Dolstra
parent
969a14599d
commit
e855c7e2c9
6 changed files with 104 additions and 120 deletions
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@ -1,11 +1,11 @@
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with import <nix/config.nix>;
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{ system, inputs }:
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{ name, src }:
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derivation {
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name = "channels";
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system = builtins.currentSystem;
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builder = shell;
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args = [ "-e" ./unpack-channel.sh ];
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inherit system inputs bzip2 tar tr;
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inherit name src bzip2 tar tr;
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PATH = "${nixBinDir}:${coreutils}";
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}
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@ -1,30 +1,4 @@
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mkdir $out
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mkdir $out/tmp
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cd $out/tmp
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inputs=($inputs)
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for ((n = 0; n < ${#inputs[*]}; n += 2)); do
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channelName=${inputs[n]}
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channelTarball=${inputs[n+1]}
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echo "unpacking channel $channelName"
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$bzip2 -d < $channelTarball | $tar xf -
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if test -e */channel-name; then
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channelName="$(cat */channel-name)"
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fi
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nr=1
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attrName=$(echo $channelName | $tr -- '- ' '__')
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dirName=$attrName
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while test -e ../$dirName; do
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nr=$((nr+1))
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dirName=$attrName-$nr
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done
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mv * ../$dirName # !!! hacky
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done
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cd ..
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rmdir tmp
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cd $out
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$bzip2 -d < $src | $tar xf -
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mv * $out/$name
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@ -19,7 +19,7 @@
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<cmdsynopsis>
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<command>nix-channel</command>
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<group choice='req'>
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<arg choice='plain'><option>--add</option> <replaceable>url</replaceable></arg>
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<arg choice='plain'><option>--add</option> <replaceable>url</replaceable> <arg choice='opt'><replaceable>name</replaceable></arg></arg>
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<arg choice='plain'><option>--remove</option> <replaceable>url</replaceable></arg>
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<arg choice='plain'><option>--list</option></arg>
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<arg choice='plain'><option>--update</option></arg>
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@ -31,32 +31,39 @@
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<para>A Nix channel is mechanism that allows you to automatically stay
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up-to-date with a set of pre-built Nix expressions. A Nix channel is
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just a URL that points to a place that contains a set of Nix
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expressions, as well as a <command>nix-push</command> manifest. See
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also <xref linkend="sec-channels" />.</para>
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just a URL that points to a place containing a set of Nix expressions
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and a <command>nix-push</command> manifest. <phrase
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condition="manual">See also <xref linkend="sec-channels"
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/>.</phrase></para>
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<para>This command has the following operations:
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<variablelist>
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<varlistentry><term><option>--add</option> <replaceable>url</replaceable></term>
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<varlistentry><term><option>--add</option> <replaceable>url</replaceable> [<replaceable>name</replaceable>]</term>
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<listitem><para>Adds <replaceable>url</replaceable> to the list of
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subscribed channels.</para></listitem>
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<listitem><para>Adds a channel named
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<replaceable>name</replaceable> with URL
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<replaceable>url</replaceable> to the list of subscribed channels.
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If <replaceable>name</replaceable> is omitted, it defaults to the
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last component of <replaceable>url</replaceable>, with the
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suffixes <literal>-stable</literal> or
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<literal>-unstable</literal> removed.</para></listitem>
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</varlistentry>
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<varlistentry><term><option>--remove</option> <replaceable>url</replaceable></term>
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<varlistentry><term><option>--remove</option> <replaceable>name</replaceable></term>
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<listitem><para>Removes <replaceable>url</replaceable> from the
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list of subscribed channels.</para></listitem>
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<listitem><para>Removes the channel named
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<replaceable>name</replaceable> from the list of subscribed
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channels.</para></listitem>
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</varlistentry>
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<varlistentry><term><option>--list</option></term>
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<listitem><para>Prints the URLs of all subscribed channels on
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standard output.</para></listitem>
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<listitem><para>Prints the names and URLs of all subscribed
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channels on standard output.</para></listitem>
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</varlistentry>
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@ -64,7 +71,7 @@ also <xref linkend="sec-channels" />.</para>
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<listitem><para>Downloads the Nix expressions of all subscribed
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channels, makes them the default for <command>nix-env</command>
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operations (by symlinking them in the directory
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operations (by symlinking them from the directory
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<filename>~/.nix-defexpr</filename>), and performs a
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<command>nix-pull</command> on the manifests of all channels to
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make pre-built binaries available.</para></listitem>
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@ -75,8 +82,8 @@ also <xref linkend="sec-channels" />.</para>
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</para>
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<para>Note that <option>--add</option> and <option>--remove</option>
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do not automatically perform an update.</para>
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<para>Note that <option>--add</option> does not automatically perform
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an update.</para>
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<para>The list of subscribed channels is stored in
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<filename>~/.nix-channels</filename>.</para>
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@ -90,4 +97,15 @@ respectively.</para>
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</refsection>
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<refsection><title>Examples</title>
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<para>To subscribe to the Nixpkgs channel and install the GNU Hello package:</para>
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<screen>
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$ nix-channel --add http://nixos.org/releases/nixpkgs/channels/nixpkgs-unstable
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$ nix-channel --update
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$ nix-env -iA nixpkgs.hello</screen>
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</refsection>
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</refentry>
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@ -58,8 +58,9 @@ options.</phrase></para>
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<listitem><para>Causes the result of a realisation
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(<option>--realise</option> and <option>--force-realise</option>)
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to be registered as a root of the garbage collector (see <xref
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linkend="ssec-gc-roots" />). The root is stored in
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to be registered as a root of the garbage collector<phrase
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condition="manual"> (see <xref linkend="ssec-gc-roots"
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/>)</phrase>. The root is stored in
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<replaceable>path</replaceable>, which must be inside a directory
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that is scanned for roots by the garbage collector (i.e.,
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typically in a subdirectory of
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@ -1,6 +1,8 @@
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#! @perl@ -w @perlFlags@
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use strict;
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use File::Basename;
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use File::Path qw(make_path);
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use Nix::Config;
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my $manifestDir = $Nix::Config::manifestDir;
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@ -11,67 +13,67 @@ my $channelCache = "$Nix::Config::stateDir/channel-cache";
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mkdir $channelCache, 0755 unless -e $channelCache;
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$ENV{'NIX_DOWNLOAD_CACHE'} = $channelCache if -W $channelCache;
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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 $home = $ENV{"HOME"} or die '$HOME not set\n';
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my $channelsList = "$home/.nix-channels";
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my $nixDefExpr = "$home/.nix-defexpr";
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# Figure out the name of the channels profile.
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my $userName = getpwuid($<) or die "cannot figure out user name";
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my $profile = "$Nix::Config::stateDir/profiles/per-user/$userName/channels";
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make_path(dirname $profile, mode => 0755);
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my @channels;
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my %channels;
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# Reads the list of channels from the file $channelsList;
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# Reads the list of channels.
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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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next if /^\s*\#/;
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push @channels, $_;
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my ($url, $name) = split ' ', $_;
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$url =~ s/\/*$//; # remove trailing slashes
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$name = basename $url unless defined $name;
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$channels{$name} = $url;
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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 $channelsList;
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# Writes the list of channels.
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sub writeChannels {
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open CHANNELS, ">$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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foreach my $name (keys %channels) {
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print CHANNELS "$channels{$name} $name\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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# Adds a channel.
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sub addChannel {
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my $url = shift;
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my ($url, $name) = @_;
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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, $url;
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$channels{$name} = $url;
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writeChannels;
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}
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# Remove a channel from the file $channelsList;
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# Remove a channel.
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sub removeChannel {
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my $url = shift;
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my @left = ();
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my ($name) = @_;
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readChannels;
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foreach my $url2 (@channels) {
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push @left, $url2 if $url ne $url2;
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}
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@channels = @left;
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delete $channels{$name};
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writeChannels;
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system("$Nix::Config::binDir/nix-env --profile '$profile' -e '$name'") == 0
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or die "cannot remove channel `$name'";
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}
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# Fetch Nix expressions and pull cache manifests from the subscribed
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# Fetch Nix expressions and pull manifests from the subscribed
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# channels.
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sub update {
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readChannels;
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@ -82,64 +84,46 @@ sub update {
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# Do we have write permission to the manifests directory?
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die "$0: you do not have write permission to `$manifestDir'!\n" unless -W $manifestDir;
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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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# Download each channel.
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my $exprs = "";
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foreach my $name (keys %channels) {
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my $url = $channels{$name};
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# Pull the channel manifest.
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system("$Nix::Config::binDir/nix-pull", "--skip-wrong-store", "$url/MANIFEST") == 0
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or die "cannot pull cache manifest from `$url'";
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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 $inputs = "[";
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foreach my $url (@channels) {
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$url =~ /\/([^\/]+)\/?$/;
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my $channelName = $1;
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$channelName = "unnamed" unless defined $channelName;
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or die "cannot pull manifest from `$url'\n";
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# Download the channel tarball.
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my $fullURL = "$url/nixexprs.tar.bz2";
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print "downloading Nix expressions from `$fullURL'...\n";
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$ENV{"PRINT_PATH"} = 1;
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$ENV{"QUIET"} = 1;
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my ($hash, $path) = `$Nix::Config::binDir/nix-prefetch-url '$fullURL'`;
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print STDERR "downloading Nix expressions from `$fullURL'...\n";
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my ($hash, $path) = `PRINT_PATH=1 QUIET=1 $Nix::Config::binDir/nix-prefetch-url '$fullURL'`;
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die "cannot fetch `$fullURL'" if $? != 0;
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chomp $path;
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$inputs .= '"' . $channelName . '"' . " " . $path . " ";
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$exprs .= "'f: f { name = \"$name\"; src = builtins.storePath \"$path\"; }' ";
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}
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$inputs .= "]";
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# Figure out a name for the GC root.
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my $userName = getpwuid($<);
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die "who ARE you? go away" unless defined $userName;
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my $rootFile = "$Nix::Config::stateDir/gcroots/per-user/$userName/channels";
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# Build the Nix expression.
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print "unpacking channel Nix expressions...\n";
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my $outPath = `\\
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$Nix::Config::binDir/nix-build --out-link '$rootFile' --drv-link '$rootFile'.tmp \\
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'<nix/unpack-channel.nix>' \\
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--argstr system @system@ --arg inputs '$inputs'`
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or die "cannot unpack the channels";
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chomp $outPath;
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unlink "$rootFile.tmp";
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# Unpack the channel tarballs into the Nix store and install them
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# into the channels profile.
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print STDERR "unpacking channels...\n";
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system("$Nix::Config::binDir/nix-env --profile '$profile' " .
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"-f '<nix/unpack-channel.nix>' -i -E $exprs --quiet") == 0
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or die "cannot unpack the channels";
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# Make the channels appear in nix-env.
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unlink $nixDefExpr if -l $nixDefExpr; # old-skool ~/.nix-defexpr
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mkdir $nixDefExpr or die "cannot create directory `$nixDefExpr'" if !-e $nixDefExpr;
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my $channelLink = "$nixDefExpr/channels";
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unlink $channelLink; # !!! not atomic
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symlink($outPath, $channelLink) or die "cannot symlink `$channelLink' to `$outPath'";
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symlink($profile, $channelLink) or die "cannot symlink `$channelLink' to `$profile'";
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}
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sub usageError {
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print STDERR <<EOF;
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Usage:
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nix-channel --add URL
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nix-channel --remove URL
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nix-channel --add URL [CHANNEL-NAME]
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nix-channel --remove CHANNEL-NAME
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nix-channel --list
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nix-channel --update
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EOF
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@ -154,22 +138,29 @@ while (scalar @ARGV) {
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my $arg = shift @ARGV;
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if ($arg eq "--add") {
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usageError if scalar @ARGV != 1;
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addChannel (shift @ARGV);
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usageError if scalar @ARGV < 1 || scalar @ARGV > 2;
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my $url = shift @ARGV;
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my $name = shift @ARGV;
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unless (defined $name) {
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$name = basename $url;
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$name =~ s/-unstable//;
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$name =~ s/-stable//;
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}
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addChannel($url, $name);
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last;
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}
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if ($arg eq "--remove") {
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usageError if scalar @ARGV != 1;
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removeChannel (shift @ARGV);
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removeChannel(shift @ARGV);
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last;
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}
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if ($arg eq "--list") {
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usageError if scalar @ARGV != 0;
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readChannels;
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foreach my $url (@channels) {
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print "$url\n";
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foreach my $name (keys %channels) {
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print "$name $channels{$name}\n";
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}
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last;
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}
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@ -9,9 +9,9 @@ rm -f $TEST_ROOT/.nix-channels
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export HOME=$TEST_ROOT
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# Test add/list/remove.
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nix-channel --add http://foo/bar
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nix-channel --add http://foo/bar xyzzy
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nix-channel --list | grep -q http://foo/bar
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nix-channel --remove http://foo/bar
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nix-channel --remove xyzzy
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[ -e $TEST_ROOT/.nix-channels ]
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[ "$(cat $TEST_ROOT/.nix-channels)" = '' ]
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Loading…
Reference in a new issue