From 2479a589cce5c9c12044c89b3d530912efedb78e Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Sun, 2 Nov 2014 16:52:29 +0000
Subject: [PATCH] config: New instead_distro feature

The ssh-cmd git-check can now send us looking elsewhere.  This will
make migration possible.
---
 dgit | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/dgit b/dgit
index 57159b70..af710657 100755
--- a/dgit
+++ b/dgit
@@ -102,6 +102,7 @@ our $remotename = 'dgit';
 our @ourdscfield = qw(Dgit Vcs-Dgit-Master);
 our $branchprefix = 'dgit';
 our $csuite;
+our $instead_distro;
 
 sub lbranch () { return "$branchprefix/$csuite"; }
 my $lbranch_re = '^refs/heads/'.$branchprefix.'/([^/.]+)$';
@@ -595,6 +596,7 @@ sub access_distros () {
     # Returns list of distros to try, in order
     #
     # We want to try:
+    #    0. `instead of' distro name(s) we have been pointed to
     #    1. the access_quirk distro, if any
     #    2a. the user's specified distro, or failing that  } basedistro
     #    2b. the distro calculated from the suite          }
@@ -602,6 +604,7 @@ sub access_distros () {
 
     my (undef,$quirkdistro) = access_quirk();
     unshift @l, $quirkdistro;
+    unshift @l, $instead_distro;
     return grep { defined } @l;
 }
 
@@ -975,6 +978,7 @@ sub get_archive_dsc () {
     $dsc = undef;
 }
 
+sub check_for_git ();
 sub check_for_git () {
     # returns 0 or 1
     my $how = access_cfg('git-check');
@@ -985,6 +989,14 @@ sub check_for_git () {
 	     " set -e; cd ".access_cfg('git-path').";".
 	     " if test -d $package.git; then echo 1; else echo 0; fi");
 	my $r= cmdoutput @cmd;
+	if ($r =~ m/^divert (\w+)$/) {
+	    my $divert=$1;
+	    my ($usedistro,) = access_distros();
+	    $instead_distro= cfg("dgit-distro.$usedistro.diverts.$divert");
+	    $instead_distro =~ s{^/}{ access_basedistro()."/" }e;
+	    printdebug "diverting $divert so using distro $instead_distro\n";
+	    return check_for_git();
+	}
 	failedcmd @cmd unless $r =~ m/^[01]$/;
 	return $r+0;
     } elsif ($how eq 'true') {
-- 
2.30.2