X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=dgit.git;a=blobdiff_plain;f=Debian%2FDgit.pm;h=112d15bb64e2c8fbc1e64f6aba4e0569f1718176;hp=1ab65a8f24c6fd1da07d25bd03e1916f81f16f4d;hb=8c58335913e7ec0465a939a9a277e7fbd0df68e0;hpb=f08a465fb0a346019750c62dd6cdf1eed348e032

diff --git a/Debian/Dgit.pm b/Debian/Dgit.pm
index 1ab65a8f..112d15bb 100644
--- a/Debian/Dgit.pm
+++ b/Debian/Dgit.pm
@@ -6,6 +6,7 @@ use strict;
 use warnings;
 
 use POSIX;
+use IO::Handle;
 
 BEGIN {
     use Exporter   ();
@@ -15,7 +16,11 @@ BEGIN {
     @ISA         = qw(Exporter);
     @EXPORT      = qw(debiantag server_branch server_ref
                       stat_exists git_for_each_ref
-                      $package_re $component_re $branchprefix);
+                      $package_re $component_re $branchprefix
+                      initdebug enabledebug enabledebuglevel
+                      printdebug debugcmd
+                      $debugprefix *debuglevel *DEBUG
+                      shellquote printcmd);
     %EXPORT_TAGS = ( policyflags => [qw(NOFFCHECK FRESHREPO)] );
     @EXPORT_OK   = @{ $EXPORT_TAGS{policyflags} };
 }
@@ -73,4 +78,60 @@ sub git_for_each_tag_referring ($$) {
     });
 }
 
+our $debugprefix;
+our $debuglevel = 0;
+
+sub initdebug ($) { 
+    ($debugprefix) = @_;
+    open DEBUG, ">/dev/null" or die $!;
+}
+
+sub enabledebug () {
+    open DEBUG, ">&STDERR" or die $!;
+    DEBUG->autoflush(1);
+    $debuglevel ||= 1;
+}
+    
+sub enabledebuglevel ($) {
+    my ($newlevel) = @_; # may be undef (eg from env var)
+    die if $debuglevel;
+    $newlevel //= 0;
+    $newlevel += 0;
+    return unless $newlevel;
+    $debuglevel = $newlevel;
+    enabledebug();
+}
+    
+sub printdebug {
+    print DEBUG $debugprefix, @_ or die $! if $debuglevel>0;
+}
+
+sub shellquote {
+    my @out;
+    local $_;
+    foreach my $a (@_) {
+	$_ = $a;
+	if (!length || m{[^-=_./0-9a-z]}i) {
+	    s{['\\]}{'\\$&'}g;
+	    push @out, "'$_'";
+	} else {
+	    push @out, $_;
+	}
+    }
+    return join ' ', @out;
+}
+
+sub printcmd {
+    my $fh = shift @_;
+    my $intro = shift @_;
+    print $fh $intro," " or die $!;
+    print $fh shellquote @_ or die $!;
+    print $fh "\n" or die $!;
+}
+
+sub debugcmd {
+    my $extraprefix = shift @_;
+    printcmd(\*DEBUG,$debugprefix.$extraprefix,@_) if $debuglevel>0;
+}
+
 1;