Migration: add nailgun compat fix to fits cmd

Make sure that the command works when Nailgun's binary is called `ng`
and `nailgun-ng`.

fpr/migrations/0026_fits_nailgun_compat.py

@@ -0,0 +1,82 @@
+# -*- coding: utf-8 -*-
+from __future__ import print_function, unicode_literals
+
+from django.db import migrations
+
+
+OLD_FITS_CMD_UUID = '0b0d301f-b586-45d5-ba35-d76da57ce32a'
+NEW_FITS_CMD_UUID = '1a0394dc-528b-4a03-8c2b-1c158f1fb313'
+OLD_FITS_RULE_UUID = '296a131d-ce70-45ae-b800-6c71b3ea46f0'
+NEW_FITS_RULE_UUID = 'c3b06895-ef9d-401e-8c51-ac585f955655'
+
+
+def data_migration_up(apps, schema_editor):
+    """Replace the FITS command with one that is compatible with environments
+    where the Nailgun binary is called either `ng` or `nailgun-ng`.
+    """
+    FPCommand = apps.get_model('fpr', 'FPCommand')
+    FPRule = apps.get_model('fpr', 'FPRule')
+
+    fits_tool_uuid = 'c5465b07-8dc7-475e-a5c9-ccb2ba2ed083'
+    xml_format_uuid = 'd60e5243-692e-4af7-90cd-40c53cb8dc7d'
+    unknown_format_uuid = '0ab4cd40-90e7-4d75-b294-498177b3897d'
+
+    FPCommand.objects\
+        .filter(uuid=OLD_FITS_CMD_UUID)\
+        .update(enabled=False)
+
+    new_cmd = (
+        'set -euo pipefail\n'
+        'IFS=$\'\\n\\t\'\n'
+        'tempdir=$(mktemp -d %tmpDirectory%fits.XXXXXX)\n'
+        'if type ng-nailgun 1>/dev/null 2>/dev/null\n'
+        ' then function ng { ng-nailgun "$@"; }\n'
+        ' else function ng { ng "$@"; }\n'
+        'fi\n'
+        'ng edu.harvard.hul.ois.fits.Fits'
+        ' -i "%relativeLocation%"'
+        ' -o "$tempdir/fits.xml" >/dev/null\n'
+        'cat "$tempdir/fits.xml"\n'
+        'rm -r "$tempdir"')
+
+    FPCommand.objects.create(
+        uuid=NEW_FITS_CMD_UUID,
+        tool_id=fits_tool_uuid,
+        replaces_id=OLD_FITS_CMD_UUID,
+        command_usage='characterization',
+        command=new_cmd,
+        script_type='bashScript',
+        output_format_id=xml_format_uuid,
+        description='FITS')
+
+    FPRule.objects\
+        .filter(uuid=OLD_FITS_RULE_UUID)\
+        .update(enabled=False)
+
+    FPRule.objects.create(
+        uuid=NEW_FITS_RULE_UUID,
+        replaces_id=OLD_FITS_RULE_UUID,
+        format_id=unknown_format_uuid,
+        command_id=NEW_FITS_CMD_UUID,
+        purpose='default_characterization')
+
+
+def data_mgiration_down(apps, schema_editor):
+    FPCommand = apps.get_model('fpr', 'FPCommand')
+    FPRule = apps.get_model('fpr', 'FPRule')
+
+    FPRule.objects.filter(uuid=NEW_FITS_RULE_UUID).delete()
+    FPRule.objects.filter(uuid=OLD_FITS_RULE_UUID).update(enabled=True)
+    FPCommand.objects.filter(uuid=NEW_FITS_CMD_UUID).delete()
+    FPCommand.objects.filter(uuid=OLD_FITS_CMD_UUID).update(enabled=True)
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('fpr', '0025_update_fido_1312'),
+    ]
+
+    operations = [
+        migrations.RunPython(data_migration_up, data_mgiration_down),
+    ]