5 files changed, 174 insertions, 0 deletions
diff --git a/debhelper/Debian/Debhelper/Buildsystem/pgxs.pm b/debhelper/Debian/Debhelper/Buildsystem/pgxs.pm
new file mode 100644
index 0000000..f1270ea
--- /dev/null
+++ b/debhelper/Debian/Debhelper/Buildsystem/pgxs.pm
@@ -0,0 +1,58 @@
+# A debhelper build system class for building PostgreSQL extension modules using PGXS
+#
+# Per PostgreSQL major version, a `build-$version` subdirectory is created.
+#
+# Copyright: © 2020 Christoph Berg
+# License: GPL-2+
+
+package Debian::Debhelper::Buildsystem::pgxs;
+
+use strict;
+use warnings;
+use parent qw(Debian::Debhelper::Buildsystem);
+use Cwd;
+use Debian::Debhelper::Dh_Lib;
+use Debian::Debhelper::pgxs;
+
+sub DESCRIPTION {
+    "PGXS (PostgreSQL extensions), building in subdirectory per PostgreSQL version"
+}
+
+sub check_auto_buildable {
+    my $this=shift;
+    unless (-e $this->get_sourcepath("debian/pgversions")) {
+        error("debian/pgversions is required to build with PGXS");
+    }
+    return (-e $this->get_sourcepath("Makefile")) ? 1 : 0;
+}
+
+sub new {
+    my $class=shift;
+    my $this=$class->SUPER::new(@_);
+    $this->enforce_in_source_building();
+    return $this;
+}
+
+sub build {
+    my $this=shift;
+    $this->doit_in_sourcedir(qw(pg_buildext build build-%v));
+}
+
+sub install {
+    my $this=shift;
+    my $pattern = package_pattern();
+    $this->doit_in_sourcedir(qw(pg_buildext install build-%v), $pattern);
+}
+
+sub test {
+    my $this=shift;
+    verbose_print("Postponing tests to install stage");
+}
+
+sub clean {
+    my $this=shift;
+    my $pattern = package_pattern();
+    $this->doit_in_sourcedir(qw(pg_buildext clean build-%v), $pattern);
+}
+
+1;
diff --git a/debhelper/Debian/Debhelper/Buildsystem/pgxs_loop.pm b/debhelper/Debian/Debhelper/Buildsystem/pgxs_loop.pm
new file mode 100644
index 0000000..716bcbf
--- /dev/null
+++ b/debhelper/Debian/Debhelper/Buildsystem/pgxs_loop.pm
@@ -0,0 +1,33 @@
+# A debhelper build system class for building PostgreSQL extension modules using PGXS
+#
+# For packages not supporting building in subdirectories, the pgxs_loop variant builds
+# for each PostgreSQL major version in turn in the top-level directory.
+#
+# Copyright: © 2020 Christoph Berg
+# License: GPL-2+
+
+package Debian::Debhelper::Buildsystem::pgxs_loop;
+
+use strict;
+use warnings;
+use parent qw(Debian::Debhelper::Buildsystem::pgxs);
+use Cwd;
+use Debian::Debhelper::Dh_Lib;
+use Debian::Debhelper::pgxs;
+
+sub DESCRIPTION {
+    "PGXS (PostgreSQL extensions), building for each PostgreSQL version in top level directory"
+}
+
+sub build {
+    my $this=shift;
+    verbose_print("Postponing build to install stage; if this package supports out-of-tree builds, replace --buildsystem=pgxs_loop by --buildsystem=pgxs to build in the build stage");
+}
+
+sub install {
+    my $this=shift;
+    my $pattern = package_pattern();
+    $this->doit_in_sourcedir(qw(pg_buildext loop), $pattern);
+}
+
+1;
diff --git a/debhelper/Debian/Debhelper/Sequence/pgxs.pm b/debhelper/Debian/Debhelper/Sequence/pgxs.pm
new file mode 100644
index 0000000..45a1ff1
--- /dev/null
+++ b/debhelper/Debian/Debhelper/Sequence/pgxs.pm
@@ -0,0 +1,22 @@
+#!/usr/bin/perl
+
+use warnings;
+use strict;
+use Debian::Debhelper::Dh_Lib;
+
+# check if debian/control needs updating from debian/control.in
+insert_after("dh_clean", "pg_buildext");
+add_command_options("pg_buildext",  "checkcontrol");
+
+# use PGXS for clean, build, and install
+add_command_options("dh_auto_clean", "--buildsystem=pgxs");
+add_command_options("dh_auto_build", "--buildsystem=pgxs");
+add_command_options("dh_auto_install", "--buildsystem=pgxs");
+
+# move tests from dh_auto_test to dh_pgxs_test
+remove_command("dh_auto_test");
+if (! get_buildoption("nocheck")) {
+    insert_after("dh_link", "dh_pgxs_test");
+}
+
+1;
diff --git a/debhelper/Debian/Debhelper/Sequence/pgxs_loop.pm b/debhelper/Debian/Debhelper/Sequence/pgxs_loop.pm
new file mode 100644
index 0000000..314085b
--- /dev/null
+++ b/debhelper/Debian/Debhelper/Sequence/pgxs_loop.pm
@@ -0,0 +1,23 @@
+#!/usr/bin/perl
+
+use warnings;
+use strict;
+use Debian::Debhelper::Dh_Lib;
+
+# check if debian/control needs updating from debian/control.in
+insert_after("dh_clean", "pg_buildext");
+add_command_options("pg_buildext",  "checkcontrol");
+
+# use PGXS for clean, build, and install
+add_command_options("dh_auto_clean", "--buildsystem=pgxs_loop");
+add_command_options("dh_auto_build", "--buildsystem=pgxs_loop");
+add_command_options("dh_auto_install", "--buildsystem=pgxs_loop");
+
+# move tests from dh_auto_test to dh_pgxs_test
+remove_command("dh_auto_test");
+if (! get_buildoption("nocheck")) {
+    insert_after("dh_link", "dh_pgxs_test");
+    add_command_options("dh_pgxs_test", "loop");
+}
+
+1;
diff --git a/debhelper/Debian/Debhelper/pgxs.pm b/debhelper/Debian/Debhelper/pgxs.pm
new file mode 100644
index 0000000..e3d86b2
--- /dev/null
+++ b/debhelper/Debian/Debhelper/pgxs.pm
@@ -0,0 +1,38 @@
+# A debhelper build system class for building PostgreSQL extension modules using PGXS
+#
+# Copyright: © 2020 Christoph Berg
+# License: GPL-2+
+
+package Debian::Debhelper::pgxs;
+
+use strict;
+use warnings;
+use Exporter 'import';
+our @EXPORT = qw(package_pattern);
+
+=head1 package_pattern()
+
+From C<debian/control.in>, look for the package name containing the
+B<PGVERSION> placeholder, and return it in the format suitable for passing to
+B<pg_buildext>, i.e. with B<PGVERSION> replaced by B<%v>.
+
+For B<Package: postgresql-PGVERSION-unit> it will return B<postgresql-%v-unit>.
+
+Errors out if more than one package with the B<PGVERSION> placeholder is found.
+
+=cut
+
+sub package_pattern () {
+    open F, "debian/control.in" or die "debian/control.in: $!";
+    my $pattern;
+    while (<F>) {
+        if (/^Package: (.*)PGVERSION(.*)/) {
+            die "More than one Package with PGVERSION placeholder found in debian/control.in, cannot build with dh --buildsystem=pgxs. Use pg_buildext manually." if ($pattern);
+            $pattern = "$1%v$2";
+        }
+    }
+    close F;
+    return $pattern;
+}
+
+1;