Allow running on unknown distros

For unknown distros with no bootstrap file default to using
a specific unknown file when in force mode (which only sets up
the virtualenv for anvil).

This allows smithy to be ran on those unknown distros (although
most of the followup operations will still not succeed).

Change-Id: Iac36f1583e16f55ba34b5393c7096c750ee4990f

smithy

@@ -195,10 +195,8 @@ run_smithy()
 
 puke()
 {
-    cleaned_force=$(echo "$FORCE" | sed -e 's/\([A-Z]\)/\L\1/g;s/\s//g')
-    if [ "$cleaned_force" == "yes" ]; then
-        run_smithy
-    else
+    local cleaned_force=$(echo "$FORCE" | sed -e 's/\([A-Z]\)/\L\1/g;s/\s//g')
+    if [ "$cleaned_force" != "yes" ]; then
         echo -e "To run anyway set FORCE=yes and rerun." >&2
         exit 1
     fi
@@ -326,13 +324,21 @@ fi
 if [ ! -f "$BSCONF_FILE" ]; then
     echo "Anvil has not been tested on distribution '$OSNAME'" >&2
     puke
+else
+    MIN_RELEASE=${MIN_RELEASE:?"Error: MIN_RELEASE is undefined!"}
+    SHORTNAME=${SHORTNAME:?"Error: SHORTNAME is undefined!"}
+    if [ "$RELEASE" != "$(greatest_version "$RELEASE" "$MIN_RELEASE")" ]; then
+        echo "This script must be run on $SHORTNAME $MIN_RELEASE+ and not $SHORTNAME $RELEASE." >&2
+        puke
+    fi
 fi
 
-MIN_RELEASE=${MIN_RELEASE:?"Error: MIN_RELEASE is undefined!"}
-SHORTNAME=${SHORTNAME:?"Error: SHORTNAME is undefined!"}
-if [ "$RELEASE" != "$(greatest_version "$RELEASE" "$MIN_RELEASE")" ]; then
-    echo "This script must be run on $SHORTNAME $MIN_RELEASE+ and not $SHORTNAME $RELEASE." >&2
-    puke
+# If we got here then we must be in force mode, setup with the default configuration
+# file for unknown distros...
+if [ ! -f "$BSCONF_FILE" ]; then
+    BSCONF_FILE="$BSCONF_DIR/Unknown"
+    SHORTNAME="$OSDIST"
+    source "$BSCONF_FILE"
 fi
 
 echo "Bootstrapping $SHORTNAME $RELEASE"

tools/bootstrap/Unknown

@@ -0,0 +1,2 @@
+# -*- sh -*-
+STEPS="virtualenv"