anaconda: fix dracut module to work with reduced dependencies

Do not fail because of not present url-lib. Also 'loop' module requires manual
loading now.

anaconda/dracut/anaconda-diskroot

@@ -35,6 +35,8 @@ path="$2" # optional, could be empty
 
 [ -e "/dev/root" ] && exit 1 # we already have a root device!
 
+modprobe -q loop
+
 info "anaconda using disk root at $dev"
 mount $dev $repodir || warn "Couldn't mount $dev"
 anaconda_live_root_dir $repodir $path

anaconda/dracut/module-setup.sh

@@ -7,7 +7,7 @@ check() {
 }
 
 depends() {
-    echo img-lib
+    echo img-lib dmsquash-live
     case "$(uname -m)" in
         s390*) echo cms ;;
     esac

anaconda/dracut/parse-anaconda-options.sh

@@ -2,7 +2,11 @@
 # parse-anaconda-options.sh - parse installer-specific options
 
 . /lib/anaconda-lib.sh
-. /lib/url-lib.sh
+if [ -r /lib/url-lib.sh ]; then
+    . /lib/url-lib.sh
+else
+    alias set_http_header=:
+fi
 
 # create the repodir and isodir that anaconda will look for
 mkdir -p $repodir $isodir