Introduce EXIM_BUILD_SUFFIX for src/Makefile and testsuite

This enables parallel builds in a shared directory, if they have
the same os-type and arch-type. Think about EXIM_BUILD_SUFFIX
as 'name of your linux distro'

1 files changed, 57 insertions, 1 deletions

diff --git a/test/lib/Exim/Runtest.pm b/test/lib/Exim/Runtest.pm
index 851c29d3b..1677ae3e6 100644
--- a/test/lib/Exim/Runtest.pm
+++ b/test/lib/Exim/Runtest.pm
@@ -3,10 +3,11 @@ use 5.010;
 use strict;
 use warnings;
 use IO::Socket::INET;
+use Cwd;
 use Carp;
 
 use parent 'Exporter';
-our @EXPORT_OK = qw(mailgroup dynamic_socket);
+our @EXPORT_OK = qw(mailgroup dynamic_socket exim_binary);
 our %EXPORT_TAGS = (
     all => \@EXPORT_OK,
 );
@@ -57,6 +58,53 @@ sub dynamic_socket {
     croak 'Can not allocate a free port.';
 }
 
+sub exim_binary {
+
+    # two simple cases, absolute path or relative path and executable
+    return @_ if $_[0] =~ /^\//;
+    return Cwd::abs_path(shift), @_ if -x $_[0];
+
+    # so we're still here, if the simple approach didn't help.
+
+    # if there is '../exim-snapshot/<build-dir>/exim', use this
+    # if there is '../exim4/<build-dir>/exim', use this
+    # if there is '../exim-*.*/<build-dir>/exim', use the one with the highest version
+    #   4.84 < 4.85RC1 < 4.85RC2 < 4.85 < 4.86RC1 < … < 4.86
+    # if there is '../src/<build-dir>', use this
+    #
+
+    my $prefix = '..';  # was intended for testing.
+
+    # get a list of directories having the "scripts/{os,arch}-type"
+    # scripts
+    my @candidates = grep { -x "$_/scripts/os-type" and -x "$_/scripts/arch-type" }
+        "$prefix/exim-snapshot", "$prefix/exim4", # highest priority
+        (reverse sort {                           # list of exim-*.* directories
+        # split version number from RC number
+        my @a = ($a =~ /(\d+\.\d+)(?:RC(\d+))?/);
+        my @b = ($b =~ /(\d+\.\d+)(?:RC(\d+))?/);
+        # if the versions are not equal, we're fine,
+        # but otherwise we've to compare the RC number, where an
+        # empty RC number is better than a non-empty
+        ($a[0] cmp $b[0]) || (defined $a[1] ? defined $b[1] ? $a[1] cmp $b[1] : -1 : 1)
+        } glob "$prefix/exim-*.*"),
+        "$prefix/src";                       # the "normal" source
+
+    # binaries should be found now depending on the os-type and
+    # arch-type in the directories we got above
+    my @binaries = grep { -x }
+        map { ("$_/exim", "$_/exim4") }
+        map {
+            my $os = `$_/scripts/os-type`;
+            my $arch = `$_/scripts/arch-type`;
+            chomp($os, $arch);
+            "$_/build-$os-$arch" . ($ENV{EXIM_BUILD_SUFFIX} ? ".$ENV{EXIM_BUILD_SUFFIX}" : '');
+        } @candidates;
+
+    return $binaries[0], @_;
+}
+
+
 1;
 
 __END__
@@ -75,6 +123,14 @@ group name or some other random but existing group.
 Return a dynamically allocated listener socket in the range
 between 1024 and 65534;
 
+=item ($binary, @argv) = B<exim_binary>(I<@argv>)
+
+Find the Exim binary. Consider the first element of I<@argv>
+and remove it from I<@argv>, if it is an executable binary.
+Otherwise search the binary (while honouring C<EXIM_BUILD_SUFFIX>,
+C<../scripts/os-type> and C<../os-arch>) and return the
+the path to the binary and the unmodified I<@argv>.
+
 =back
 
 =cut