seed kmig-unlink with emig-unlink

diff --git a/kmig.d/bin/mig-unlink b/kmig.d/bin/mig-unlink
new file mode 100755 (executable)
index 0000000..c92aef3
--- /dev/null
+++ b/kmig.d/bin/mig-unlink
@@ -0,0 +1,71 @@
+#!/usr/bin/perl -w
+###############################################################################
+=pod
+
+=head1 NAME
+
+mig-unlink
+
+Clear any association between the specified file and a parent table within the
+migration schema.
+
+=head1 SYNOPSIS
+
+B<mig-unlink> <file>
+
+=cut
+
+###############################################################################
+
+use strict;
+use Switch;
+use Env qw(
+    HOME PGHOST PGPORT PGUSER PGDATABASE MIGSCHEMA
+    MIGBASEWORKDIR MIGBASEGITDIR MIGGITDIR MIGWORKDIR
+);
+use Pod::Usage;
+use DBI;
+use Cwd 'abs_path';
+use FindBin;
+my $mig_bin = "$FindBin::Bin/";
+use lib "$FindBin::Bin/";
+use EMig;
+
+pod2usage(-verbose => 2) if ! $ARGV[0] || $ARGV[0] eq '--help';
+
+EMig::die_if_no_env_migschema();
+EMig::die_if_mig_tracking_table_does_not_exist();
+
+my $file = abs_path($ARGV[0]);
+if ($file =~ /^$MIGBASEWORKDIR/) {
+    unlink_table(@ARGV);
+} else {
+    print "File falls outside of MIGWORKDIR ($MIGWORKDIR): $file\n";
+}
+
+exit 0;
+
+###############################################################################
+
+sub unlink_table {
+    my $file = abs_path(shift);
+
+    my $tracked_file_id = EMig::check_for_tracked_file($file);
+    if ($tracked_file_id) {
+        my $data = EMig::status_this_file($file);
+        my $table = $data->{'parent_table'} || '';
+
+        print "unlinking table ($table) from file: $file\n";
+
+        my $dbh = EMig::db_connect();
+        my $rv = $dbh->do("
+            UPDATE $MIGSCHEMA.tracked_file
+            SET parent_table = ''
+            WHERE base_filename = " . $dbh->quote($file) . "
+            ;
+        ") || die "Error updating table $MIGSCHEMA.tracked_file: $!\n";
+        EMig::db_disconnect($dbh);
+    } else {
+        print "File not currently tracked: $file\n";
+    }
+}