dh: Skips running commands that it can tell do nothing.

This is determined by the presence of special PROMISE directives within
commands that provide a high-level description of the command.

Note that when dh is passed additional debhelper options, it cannot tell if
these change the behavior of commands, and so it stops skipping any
commands.

1 files changed, 2 insertions, 0 deletions

diff --git a/dh_installcatalogs b/dh_installcatalogs
index b3aaf5e6..f65ab7cb 100755
--- a/dh_installcatalogs
+++ b/dh_installcatalogs
@@ -66,6 +66,8 @@ multiple instances of the same text to be added to maintainer scripts.
 
 init();
 
+# PROMISE: DH NOOP WITHOUT sgmlcatalogs
+
 foreach my $package (@{$dh{DOPACKAGES}}) {
 	my $tmpdir = tmpdir($package);
 	my $sgmlcatlistfile = pkgfile($package, "sgmlcatalogs");