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- #!/usr/bin/perl
-
- # Why does the world need another rpm2cpio? Because the existing one
- # won't build unless you have half a ton of things that aren't really
- # required for it, since it uses the same library used to extract RPMs.
- # In particular, it won't build on the HPsUX box I'm on.
-
- #
- # Expanded quick-reference help by Rick Moen (not the original author
- # of this script).
- #
-
- # add a path if desired
- $gzip = "gzip";
-
- sub printhelp {
- print "\n";
- print "rpm2cpio, perl version by orabidoo <odar\@pobox.com>\n";
- print "\n";
- print "use: rpm2cpio [file.rpm]\n";
- print "dumps the contents to stdout as a GNU cpio archive\n";
- print "\n";
- print "In case it's non-obvious, you'll need to redirect output\n";
- print "from this script, e.g., './rpm2cpio package.rpm > package.cpio'.\n";
- print "Then, unpack in, say, /tmp with a cpio incantation like this one:\n";
- print "'cpio -ivd < package.cpio'\n";
- print "\n";
- print "You can optionally combine both steps:\n";
- print "'rpm2cpio package.rpm | cpio -iduv'\n";
- print "\n";
- print "In either event, you will also need the 'cpio' utility available\n";
- print "on your system. If you can't find it elsewhere, source code for\n";
- print "GNU cpio is always available at ftp://ftp.gnu.org/gnu/cpio/.)\n";
- print "You'll also, of course, need Perl, and will want this Perl script\n";
- print "set as executable, i.e., by doing 'chmod 775 rpm2cpio'\n";
- print "\n";
- print "Be aware that this script works ONLY on version 3 or 4-format RPM\n";
- print "archives. You can check an archive's RPM-format version using\n";
- print "the Unix 'file' utility. Also, be aware that the 'cpio'\n";
- print "incantations above will unpack files at the current directory\n";
- print "level.\n";
- print "\n";
- exit 0;
- }
-
- if ($#ARGV == -1) {
- printhelp if -t STDIN;
- $f = "STDIN";
- } elsif ($#ARGV == 0) {
- open(F, "< $ARGV[0]") or die "Can't read file $ARGV[0]\n";
- $f = 'F';
- } else {
- printhelp;
- }
-
- printhelp if -t STDOUT;
-
- # gobble the file up
- undef $/;
- $|=1;
- $rpm = <$f>;
- close ($f);
-
- ($magic, $major, $minor, $crap) = unpack("NCC C90", $rpm);
-
- die "Not an RPM\n" if $magic != 0xedabeedb;
- die "Not a version 3 or 4 RPM\n" if $major != 3 and $major != 4;
-
- $rpm = substr($rpm, 96);
-
- while ($rpm ne '') {
- $rpm =~ s/^\c@*//s;
- ($magic, $crap, $sections, $bytes) = unpack("N4", $rpm);
- $smagic = unpack("n", $rpm);
- last if $smagic eq 0x1f8b;
- die "Error: header not recognized\n" if $magic != 0x8eade801;
- $rpm = substr($rpm, 16*(1+$sections) + $bytes);
- }
-
- die "bogus RPM\n" if $rpm eq '';
-
- open(ZCAT, "|gzip -cd") || die "can't pipe to gzip\n";
- print STDERR "CPIO archive found!\n";
-
- print ZCAT $rpm;
- close ZCAT;
-
-