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Support tarballs in nix channel URLs

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This commit is contained in:
Dan Peebles 2015-04-20 00:34:29 -04:00
parent 4d652875bd
commit 8a84bd8c8b
2 changed files with 77 additions and 35 deletions
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89
scripts/nix-channel.in
View file

@ -6,6 +6,7 @@ use File::Basename;
use File::Path qw(mkpath);
use Nix::Config;
use Nix::Manifest;
use File::Temp qw(tempdir);
binmode STDERR, ":encoding(utf8)";
@ -98,42 +99,14 @@ sub update {
my $url = $channels{$name};
my $origUrl = "$url/MANIFEST";
# Check if $url is a redirect. If so, follow it now to ensure
# consistency if the redirection is changed between
# downloading the manifest and the tarball.
my $headers = `$Nix::Config::curl --silent --head '$url'`;
# We want to download the url to a file to see if it's a tarball while also checking if we
# got redirected in the process, so that we can grab the various parts of a nix channel
# definition from a consistent location if the redirect changes mid-download.
my $tmpdir = tempdir( CLEANUP => 1 );
my $filename;
($url, $filename) = `cd $tmpdir && $Nix::Config::curl --silent --write-out '%{url_effective}\n%{filename_effective}' -L '$url' -O`;
die "$0: unable to check ‘$url’\n" if $? != 0;
$headers =~ s/\r//g;
$url = $1 if $headers =~ /^Location:\s*(.*)\s*$/m;
# Check if the channel advertises a binary cache.
my $binaryCacheURL = `$Nix::Config::curl --silent '$url'/binary-cache-url`;
my $extraAttrs = "";
my $getManifest = ($Nix::Config::config{"force-manifest"} // "false") eq "true";
if ($? == 0 && $binaryCacheURL ne "") {
$extraAttrs .= "binaryCacheURL = \"$binaryCacheURL\"; ";
deleteOldManifests($origUrl, undef);
} else {
$getManifest = 1;
}
if ($getManifest) {
# No binary cache, so pull the channel manifest.
mkdir $manifestDir, 0755 unless -e $manifestDir;
die "$0: you do not have write permission to ‘$manifestDir’!\n" unless -W $manifestDir;
$ENV{'NIX_ORIG_URL'} = $origUrl;
system("$Nix::Config::binDir/nix-pull", "--skip-wrong-store", "$url/MANIFEST") == 0
or die "cannot pull manifest from ‘$url’\n";
}
# Download the channel tarball.
my $fullURL = "$url/nixexprs.tar.xz";
system("$Nix::Config::curl --fail --silent --head '$fullURL' > /dev/null") == 0 or
$fullURL = "$url/nixexprs.tar.bz2";
print STDERR "downloading Nix expressions from ‘$fullURL’...\n";
my ($hash, $path) = `PRINT_PATH=1 QUIET=1 $Nix::Config::binDir/nix-prefetch-url '$fullURL'`;
die "cannot fetch ‘$fullURL’\n" if $? != 0;
chomp $path;
chomp $url;
# If the URL contains a version number, append it to the name
# attribute (so that "nix-env -q" on the channels profile
@ -141,6 +114,52 @@ sub update {
my $cname = $name;
$cname .= $1 if basename($url) =~ /(-\d.*)$/;
my $path;
my $ret = -1;
if (-e "$tmpdir/$filename") {
# Get our temporary download into the store
(my $hash, $path) = `PRINT_PATH=1 QUIET=1 $Nix::Config::binDir/nix-prefetch-url 'file://$tmpdir/$filename'`;
chomp $path;
# Try unpacking the expressions to see if they'll be valid for us to process later.
# Like anything in nix, this will cache the result so we don't do it again outside of the loop below
$ret = system("$Nix::Config::binDir/nix-build --no-out-link -E 'import <nix/unpack-channel.nix> " .
"{ name = \"$cname\"; channelName = \"$name\"; src = builtins.storePath \"$path\"; }'");
}
# The URL doesn't unpack directly, so let's try treating it like a full channel folder with files in it
my $extraAttrs = "";
if ($ret != 0) {
# Check if the channel advertises a binary cache.
my $binaryCacheURL = `$Nix::Config::curl --silent '$url'/binary-cache-url`;
my $getManifest = ($Nix::Config::config{"force-manifest"} // "false") eq "true";
if ($? == 0 && $binaryCacheURL ne "") {
$extraAttrs .= "binaryCacheURL = \"$binaryCacheURL\"; ";
deleteOldManifests($origUrl, undef);
} else {
$getManifest = 1;
}
if ($getManifest) {
# No binary cache, so pull the channel manifest.
mkdir $manifestDir, 0755 unless -e $manifestDir;
die "$0: you do not have write permission to ‘$manifestDir’!\n" unless -W $manifestDir;
$ENV{'NIX_ORIG_URL'} = $origUrl;
system("$Nix::Config::binDir/nix-pull", "--skip-wrong-store", "$url/MANIFEST") == 0
or die "cannot pull manifest from ‘$url’\n";
}
# Download the channel tarball.
my $fullURL = "$url/nixexprs.tar.xz";
system("$Nix::Config::curl --fail --silent --head '$fullURL' > /dev/null") == 0 or
$fullURL = "$url/nixexprs.tar.bz2";
print STDERR "downloading Nix expressions from ‘$fullURL’...\n";
(my $hash, $path) = `PRINT_PATH=1 QUIET=1 $Nix::Config::binDir/nix-prefetch-url '$fullURL'`;
die "cannot fetch ‘$fullURL’\n" if $? != 0;
chomp $path;
}
# Regardless of where it came from, add the expression representing this channel to accumulated expression
$exprs .= "'f: f { name = \"$cname\"; channelName = \"$name\"; src = builtins.storePath \"$path\"; $extraAttrs }' ";
}

23
tests/nix-channel.sh
View file

@ -41,3 +41,26 @@ grep -q 'item.*attrPath="foo".*name="dependencies"' $TEST_ROOT/meta.xml
# Do an install.
nix-env -i dependencies
[ -e $TEST_ROOT/var/nix/profiles/default/foobar ]
clearProfiles
clearManifests
rm -f $TEST_ROOT/.nix-channels
# Test updating from a tarball
nix-channel --add file://$TEST_ROOT/foo/nixexprs.tar.bz2
nix-channel --update
# Do a query.
nix-env -qa \* --meta --xml --out-path > $TEST_ROOT/meta.xml
if [ "$xmllint" != false ]; then
$xmllint --noout $TEST_ROOT/meta.xml || fail "malformed XML"
fi
grep -q 'meta.*description.*Random test package' $TEST_ROOT/meta.xml
grep -q 'item.*attrPath="foo".*name="dependencies"' $TEST_ROOT/meta.xml
# Do an install.
nix-env -i dependencies
[ -e $TEST_ROOT/var/nix/profiles/default/foobar ]