5 dh_link - create symlinks in package build directories
11 use Debian::Debhelper::Dh_Lib;
15 B<dh_link> [S<I<debhelper options>>] [B<-A>] [S<I<source destination ...>>]
19 dh_link is a debhelper program that creates symlinks in package build
22 dh_link accepts a list of pairs of source and destination files. The source
23 files are the already existing files that will be symlinked from. The
24 destination files are the symlinks that will be created. There B<must> be
25 an equal number of source and destination files specified.
27 The list can be specified in two ways. A file named debian/package.links
28 can list pairs of files. If you use this file, you should put each pair
29 of files on its own line, and separate the files within the pair with
30 whitespace. Also, pairs of files can be specified as parameters - these
31 pairs will only be created in the package build directory of the first
32 package dh_link is told to act on. By default, this is the first binary
33 package in debian/control, but if you use -p, -i, or -a flags, it will be
34 the first package specified by those flags.
36 Be sure you B<do> specify the full filename to both the source and
37 destination files (unlike you would do if you were using something like
40 dh_link will generate symlinks that comply with debian policy - absolute
41 when policy says they should be absolute, and relative links with as short
42 a path as possible. It will also create any subdirectories it needs to to put
45 dh_link also scans the package build tree for existing symlinks which do not
46 conform to debian policy, and corrects them (v4 only).
54 Create any links specified by command line parameters in ALL packages
55 acted on, not just the first.
57 =item I<source destination ...>
59 Create a file named "destination" as a link to a file named "source". Do
60 this in the package build directory of the first package acted on.
61 (Or in all packages if -A is specified.)
67 dh_link usr/share/man/man1/foo.1 usr/share/man/man1/bar.1
69 Make bar.1 be a symlink to foo.1
71 dh_link var/lib/foo usr/lib/foo \
72 usr/X11R6/man/man1/foo.1x usr/share/man/man1/bar.1
74 Make /usr/lib/foo/ be a link to /var/lib/foo/, and bar.1 be a symlink to
81 foreach my $package (@{$dh{DOPACKAGES}}) {
82 my $tmp=tmpdir($package);
83 my $file=pkgfile($package,"links");
87 @links=filearray($file);
90 # Make sure it has pairs of symlinks and destinations. If it
91 # doesn't, $#links will be _odd_ (not even, -- it's zero-based).
92 if (int($#links/2) eq $#links/2) {
93 error("$file lists a link without a destination.");
96 if (($package eq $dh{FIRSTPACKAGE} || $dh{PARAMS_ALL}) && @ARGV) {
100 # Same test as above, including arguments this time.
101 if (int($#links/2) eq $#links/2) {
102 error("parameters list a link without a destination.");
105 # v4 only and only if there is a temp dir already
106 if (! compat(3) && -e $tmp) {
107 # Scan for existing links and add them to @links, so they
108 # are recreated policy conformant.
112 my $dir=$File::Find::dir;
114 my $target = readlink($_);
115 if ($target=~/^\//) {
116 push @links, $target;
119 push @links, "$dir/$target";
121 push @links, "$dir/$_";
132 # Relavatize src and dest.
136 # Make sure the directory the link will be in exists.
137 my $basedir=dirname("$tmp/$dest");
139 doit("install","-d",$basedir);
142 # Policy says that if the link is all within one toplevel
143 # directory, it should be relative. If it's between
144 # top level directories, leave it absolute.
145 my @src_dirs=split(m:/+:,$src);
146 my @dest_dirs=split(m:/+:,$dest);
147 if ($src_dirs[0] eq $dest_dirs[0]) {
148 # Figure out how much of a path $src and $dest
151 for ($x=0; $x<$#src_dirs && $src_dirs[$x] eq $dest_dirs[$x]; $x++) {}
152 # Build up the new src.
154 for (1..$#dest_dirs - $x) {
157 for ($x .. $#src_dirs) {
158 $src.=$src_dirs[$_]."/";
163 # Make sure it's properly absolute.
167 doit("ln","-sf",$src,"$tmp/$dest");
175 This program is a part of debhelper.
179 Joey Hess <joeyh@debian.org>