#!/usr/bin/env perl
#
# Copyright (C) 2006 OpenWrt.org
# Copyright (C) 2016 LEDE project
#
# This is free software, licensed under the GNU General Public License v2.
# See /LICENSE for more information.
#
use strict;
use warnings;
use File::Basename;
use File::Copy;
use Text::ParseWords;
@ARGV > 2 or die "Syntax: $0 <target dir> <filename> <hash> <url filename> [<mirror> ...]\n";
my $url_filename;
my $target = glob(shift @ARGV);
my $filename = shift @ARGV;
my $file_hash = shift @ARGV;
$url_filename = shift @ARGV unless $ARGV[0] =~ /:\/\//;
my $scriptdir = dirname($0);
my @mirrors;
my $ok;
my $check_certificate = $ENV{DOWNLOAD_CHECK_CERTIFICATE} eq "y";
$url_filename or $url_filename = $filename;
sub localmirrors {
my @mlist;
open LM, "$scriptdir/localmirrors" and do {
while (<LM>) {
chomp $_;
push @mlist, $_ if $_;
}
close LM;
};
open CONFIG, "<".$ENV{'TOPDIR'}."/.config" and do {
while (<CONFIG>) {
/^CONFIG_LOCALMIRROR="(.+)"/ and do {
chomp;
my @local_mirrors = split(/;/, $1);
push @mlist, @local_mirrors;
};
}
close CONFIG;
};
my $mirror = $ENV{'DOWNLOAD_MIRROR'};
$mirror and push @mlist, split(/;/, $mirror);
return @mlist;
}
sub which($) {
my $prog = shift;
my $res = `command -v $prog`;
$res or return undef;
return $res;
}
sub hash_cmd() {
my $len = length($file_hash);
my $cmd;
$len == 64 and return "$ENV{'MKHASH'} sha256";
$len == 32 and return "$ENV{'MKHASH'} md5";
return undef;
}
sub download_cmd($) {
my $url = shift;
my $have_curl = 0;
if (open CURL, "curl --version 2>/dev/null |") {
if (defined(my $line = readline CURL)) {
$have_curl = 1 if $line =~ /^curl /;
}
close CURL;
}
return $have_curl
? (qw(curl -k -f --connect-timeout 20 --retry 5 --location),
$check_certificate ? () : '--insecure',
shellwords($ENV{CURL_OPTIONS} || ''),
$url)
: (qw(wget --tries=5 --timeout=20 --output-document=-),
$check_certificate ? () : '--no-check-certificate',
shellwords($ENV{WGET_OPTIONS} || ''),
$url)
;
}
my $hash_cmd = hash_cmd();
$hash_cmd or ($file_hash eq "skip") or die "Cannot find appropriate hash command, ensure the provided hash is either a MD5 or SHA256 checksum.\n";
sub download
{
my $mirror = shift;
my $download_filename = shift;
$mirror =~ s!/$!!;
if ($mirror =~ s!^file://!!) {
if (! -d "$mirror") {
print STDERR "Wrong local cache directory -$mirror-.\n";
cleanup();
return;
}
if (! -d "$target") {
system("mkdir", "-p", "$target/");
}
if (! open TMPDLS, "find $mirror -follow -name $filename 2>/dev/null |") {
print("Failed to search for $filename in $mirror\n");
return;
}
my $link;
while (defined(my $line = readline TMPDLS)) {
chomp ($link = $line);
if ($. > 1) {
print("$. or more instances of $filename in $mirror found . Only one instance allowed.\n");
return;
}
}
close TMPDLS;
if (! $link) {
print("No instances of $filename found in $mirror.\n");
return;
}
print("Copying $filename from $link\n");
copy($link, "$target/$filename.dl");
$hash_cmd and do {
if (system("cat '$target/$filename.dl' | $hash_cmd > '$target/$filename.hash'")) {
print("Failed to generate hash for $filename\n");
return;
}
};
} else {
my @cmd = download_cmd("$mirror/$download_filename");
print STDERR "+ ".join(" ",@cmd)."\n";
open(FETCH_FD, '-|', @cmd) or die "Cannot launch curl or wget.\n";
$hash_cmd and do {
open MD5SUM, "| $hash_cmd > '$target/$filename.hash'" or die "Cannot launch $hash_cmd.\n";
};
open OUTPUT, "> $target/$filename.dl" or die "Cannot create file $target/$filename.dl: $!\n";
my $buffer;
while (read FETCH_FD, $buffer, 1048576) {
$hash_cmd and print MD5SUM $buffer;
print OUTPUT $buffer;
}
$hash_cmd and close MD5SUM;
close FETCH_FD;
close OUTPUT;
if ($? >> 8) {
print STDERR "Download failed.\n";
cleanup();
return;
}
}
$hash_cmd and do {
my $sum = `cat "$target/$filename.hash"`;
$sum =~ /^(\w+)\s*/ or die "Could not generate file hash\n";
$sum = $1;
if ($sum ne $file_hash) {
print STDERR "Hash of the downloaded file does not match (file: $sum, requested: $file_hash) - deleting download.\n";
cleanup();
return;
}
};
unlink "$target/$filename";
system("mv", "$target/$filename.dl", "$target/$filename");
cleanup();
}
sub cleanup
{
unlink "$target/$filename.dl";
unlink "$target/$filename.hash";
}
@mirrors = localmirrors();
foreach my $mirror (@ARGV) {
if ($mirror =~ /^\@SF\/(.+)$/) {
# give sourceforge a few more tries, because it redirects to different mirrors
for (1 .. 5) {
push @mirrors, "https://downloads.sourceforge.net/$1";
}
} elsif ($mirror =~ /^\@OPENWRT$/) {
# use OpenWrt source server directly
} elsif ($mirror =~ /^\@DEBIAN\/(.+)$/) {
push @mirrors, "https://ftp.debian.org/debian/$1";
push @mirrors, "https://mirror.leaseweb.com/debian/$1";
push @mirrors, "https://mirror.netcologne.de/debian/$1";
} elsif ($mirror =~ /^\@APACHE\/(.+)$/) {
push @mirrors, "https://mirror.netcologne.de/apache.org/$1";
push @mirrors, "https://mirror.aarnet.edu.au/pub/apache/$1";
push @mirrors, "https://mirror.csclub.uwaterloo.ca/apache/$1";
push @mirrors, "https://archive.apache.org/dist/$1";
push @mirrors, "http://mirror.cogentco.com/pub/apache/$1";
push @mirrors, "http://mirror.navercorp.com/apache/$1";
push @mirrors, "http://ftp.jaist.ac.jp/pub/apache/$1";
push @mirrors, "ftp://apache.cs.utah.edu/apache.org/$1";
push @mirrors, "ftp://apache.mirrors.ovh.net/ftp.apache.org/dist/$1";
} elsif ($mirror =~ /^\@GITHUB\/(.+)$/) {
# give github a few more tries (different mirrors)
for (1 .. 5) {
push @mirrors, "https://raw.githubusercontent.com/$1";
}
} elsif ($mirror =~ /^\@GNU\/(.+)$/) {
push @mirrors, "https://mirror.csclub.uwaterloo.ca/gnu/$1";
push @mirrors, "https://mirror.netcologne.de/gnu/$1";
push @mirrors, "http://ftp.kddilabs.jp/GNU/gnu/$1";
push @mirrors, "http://www.nic.funet.fi/pub/gnu/gnu/$1";
push @mirrors, "http://mirror.internode.on.net/pub/gnu/$1";
push @mirrors, "http://mirror.navercorp.com/gnu/$1";
push @mirrors, "ftp://mirrors.rit.edu/gnu/$1";
push @mirrors, "ftp://download.xs4all.nl/pub/gnu/$1";
push @mirrors, "https://ftp.gnu.org/gnu/$1";
} elsif ($mirror =~ /^\@SAVANNAH\/(.+)$/) {
push @mirrors, "https://mirror.netcologne.de/savannah/$1";
push @mirrors, "https://mirror.csclub.uwaterloo.ca/nongnu/$1";
push @mirrors, "http://ftp.acc.umu.se/mirror/gnu.org/savannah/$1";
push @mirrors, "http://nongnu.uib.no/$1";
push @mirrors, "http://ftp.igh.cnrs.fr/pub/nongnu/$1";
push @mirrors, "ftp://cdimage.debian.org/mirror/gnu.org/savannah/$1";
push @mirrors, "ftp://ftp.acc.umu.se/mirror/gnu.org/savannah/$1";
} elsif ($mirror =~ /^\@KERNEL\/(.+)$/) {
my @extra = ( $1 );
if ($filename =~ /linux-\d+\.\d+(?:\.\d+)?-rc/) {
push @extra, "$extra[0]/testing";
} elsif ($filename =~ /linux-(\d+\.\d+(?:\.\d+)?)/) {
push @extra, "$extra[0]/longterm/v$1";
}
foreach my $dir (@extra) {
push @mirrors, "https://cdn.kernel.org/pub/$dir";
push @mirrors, "https://download.xs4all.nl/ftp.kernel.org/pub/$dir";
push @mirrors, "https://mirrors.mit.edu/kernel/$dir";
push @mirrors, "http://ftp.nara.wide.ad.jp/pub/kernel.org/$dir";
push @mirrors, "http://www.ring.gr.jp/archives/linux/kernel.org/$dir";
push @mirrors, "ftp://ftp.riken.jp/Linux/kernel.org/$dir";
push @mirrors, "ftp://www.mirrorservice.org/sites/ftp.kernel.org/pub/$dir";
}
} elsif ($mirror =~ /^\@GNOME\/(.+)$/) {
push @mirrors, "https://download.gnome.org/sources/$1";
push @mirrors, "https://mirror.csclub.uwaterloo.ca/gnome/sources/$1";
push @mirrors, "http://ftp.acc.umu.se/pub/GNOME/sources/$1";
push @mirrors, "http://ftp.kaist.ac.kr/gnome/sources/$1";
push @mirrors, "http://www.mirrorservice.org/sites/ftp.gnome.org/pub/GNOME/sources/$1";
push @mirrors, "http://mirror.internode.on.net/pub/gnome/sources/$1";
push @mirrors, "http://ftp.belnet.be/ftp.gnome.org/sources/$1";
push @mirrors, "ftp://ftp.cse.buffalo.edu/pub/Gnome/sources/$1";
push @mirrors, "ftp://ftp.nara.wide.ad.jp/pub/X11/GNOME/sources/$1";
} else {
push @mirrors, $mirror;
}
}
push @mirrors, 'https://sources.cdn.openwrt.org';
push @mirrors, 'https://sources.openwrt.org';
push @mirrors, 'https://mirror2.openwrt.org/sources';
if (-f "$target/$filename") {
$hash_cmd and do {
if (system("cat '$target/$filename' | $hash_cmd > '$target/$filename.hash'")) {
die "Failed to generate hash for $filename\n";
}
my $sum = `cat "$target/$filename.hash"`;
$sum =~ /^(\w+)\s*/ or die "Could not generate file hash\n";
$sum = $1;
cleanup();
exit 0 if $sum eq $file_hash;
die "Hash of the local file $filename does not match (file: $sum, requested: $file_hash) - deleting download.\n";
unlink "$target/$filename";
};
}
while (!-f "$target/$filename") {
my $mirror = shift @mirrors;
$mirror or die "No more mirrors to try - giving up.\n";
download($mirror, $url_filename);
if (!-f "$target/$filename" && $url_filename ne $filename) {
download($mirror, $filename);
}
}
$SIG{INT} = \&cleanup;
每一句都要注释，将注释和原代码一起给出
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