X-Git-Url: https://git.exim.org/buildfarm-client.git/blobdiff_plain/34e7f3555072b6ac03fca1d9715909dc093f8a36..719252c5de5ac0cca5524b1f8528f9984c086a32:/run_branches

diff --git a/run_branches b/run_branches
index 9e267af..18ee919 100755
--- a/run_branches
+++ b/run_branches
@@ -1,4 +1,4 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
 
 =comment
 
@@ -34,8 +34,13 @@ if ($0 =~ /(.*)\.pl$/) {
 
 # Most of the client code assumes that our working directory
 # is the client code directory.
+my %CALLED = (
+    cwd => cwd(),
+    argv0 => $0,
+    argv => [@ARGV],	# get a copy!
+);
 chdir $RealBin or die "$0: Can't chdir to '$RealBin': $!\n";
-say "Changed working directory to '$RealBin'" if -t;
+#say "Changed working directory to '$RealBin'" if -t;
 
 my %branch_last;
 my $run_build = './run_build';
@@ -72,6 +77,48 @@ $branch = 'global';
 #
 require $buildconf;
 
+# Check if auto-update is wanted and possible
+eval {
+    if (not exists $EximBuild::conf{auto_update} or $EximBuild::conf{auto_update})
+    {
+	my $remote = $EximBuild::conf{auto_update} // 'origin';
+
+	die "auto-update not possible: need write permissions in @{[cwd]}\n"
+	    if not -w '.';
+
+	# Get information about our remote and calculate the chance for a
+	# successfull auto-update. Based on:
+	# http://stackoverflow.com/questions/3258243/check-if-pull-needed-in-git
+	system("git fetch $remote") == 0 or die "'git fetch $remote' failed\n";
+	my ($upstream, $local, $base) = qx'git rev-parse ...@{upstream}' or die "'git rev-parse' failed\n";
+
+	$base =~ s/^\^//;
+
+	if ($upstream ne $local) {
+
+	    if ($base ne $local) {
+		die "the merge base is not local anymore. Refusing to `git pull`\n"
+	    }
+
+	    # if we're the merge base, the ff-only should work
+	    # except if there are local changes. We won't stop, if we
+	    # fail to update, but we'll issue a warning
+	    system("git pull --ff-only $remote") == 0 or die "git pull --ff-only\n";
+
+	    say "re-execute after update";
+	    chdir $CALLED{cwd} or die "Can't chdir to $CALLED{cwd}: $!\n";
+	    exec $CALLED{argv0}, @{$CALLED{argv}};
+	    die "Can't re-exec\n";
+	}
+    }
+};
+
+if ($@) {
+    chomp $@;
+    warn "Automatic updated failed with `$@'\n"
+	."Continue anyway\n";
+}
+
 unless (
     (
         ref $EximBuild::conf{branches_to_build} eq 'ARRAY'
@@ -93,8 +140,8 @@ elsif ($EximBuild::conf{branches_to_build} =~
     /^(ALL|HEAD_PLUS_LATEST|HEAD_PLUS_LATEST2)$/ )
 {
 
-    # Need to set the path here so we make sure we pick up the right perl.
-    # It has to be the perl that the build script would choose
+    # Need to set the path here so we make sure we pick up the right Perl.
+    # It has to be the Perl that the build script would choose
     # i.e. specially *not* the MinGW SDK perl that is invoked for the
     # build script, which means we need to put the path back the way it was
     # when we're done
@@ -112,15 +159,12 @@ elsif ($EximBuild::conf{branches_to_build} =~
 
 @branches = apply_throttle(@branches);
 
-my $global_lock_dir =
-    $EximBuild::conf{global_lock_dir}
-  ||$EximBuild::conf{build_root}
-  ||'';
+my $global_lock_dir = $EximBuild::conf{global_lock_dir}
+  // $EximBuild::conf{build_root}
+  // die "$0: need global_lock_dir\n";
 
-unless ($global_lock_dir && -d $global_lock_dir)
-{
-    die "no global lock directory: $global_lock_dir";
-}
+die "$0: need r/w permissions for directory '$global_lock_dir'\n"
+    if not -d -w $global_lock_dir;
 
 # acquire the lock
 
@@ -171,10 +215,10 @@ sub run_branch
     # Explicitly use perl from the path (and not this perl, so don't use $^X)
     # This script needs to run on Cygwin with non-cygwin perl if it's running
     # in tandem with AS/MinGW perl, since Cygwin perl doesn't honor locks
-    # the samne way, and the global lock fails. But the build script needs
+    # the same way, and the global lock fails. But the build script needs
     # to run with the native perl, even on Cygwin, which it picks up from
     # the path. (Head exploding yet?).
-    system("perl",@args);
+    system(perl => @args);
 }
 
 sub branch_last_sort