Fix several inst functions.

Move file existence checking into the individual inst functions. This makes
things a bit easier to understand and maintain.

dracut-functions

@@ -15,7 +15,7 @@
 # GNU General Public License for more details.
 #
 # You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+<# along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
 # Authors:
 #       Peter Jones <pjones@redhat.com>
@@ -31,7 +31,9 @@ strstr() { [[ ! ${1#*$2*} = $1 ]]; }
 # $2 (optional) Name for the file on the ramdisk
 # Location of the image dir is assumed to be $initdir
 inst_simple() {
-    local src=$1 target="${initdir}${2:-$1}"
+    local src target
+    [[ -f $1 ]] || return 1
+    src=$1 target="${initdir}${2:-$1}"
     [[ -f $target ]] && return 0
     mkdir -p "${target%/*}"
     echo "Installing $src" >&2
@@ -76,7 +78,9 @@ find_file() {
 # If the file is a binary executable, install all its
 # shared library dependencies, if any.
 inst_binary() {
-    local bin="$1" target="${2:-$1}"
+    local bin target
+    bin=$(find_binary "$1") || return 1
+    shift
     local LDSO NAME IO FILE ADDR I1 n f TLIBDIR
     [[ -f $initdir$target ]] && return 0
     # I love bash!
@@ -107,12 +111,13 @@ inst_binary() {
 	}
         inst_library "$FILE" 
     done < <(ldd $bin 2>/dev/null)
-    inst_simple "$bin" "$target"
+    inst_simple "$bin" "$@"
 }
 
 # same as above, except for shell scripts.
 # If your shell script does not start with shebang, it is not a shell script.
 inst_script() {
+    [[ -f $1 ]] || return 1
     local src=$1 target=${2:-$1} line
     read -r -n 80 line <"$src"
     [[ $line =~ (#! *)(/[^ ]+).* ]] || return 1
@@ -152,13 +157,8 @@ inst() {
         echo "usage: inst <file> <root> [<destination file>]"
         return 1
     fi
-    local src=$(find_file "$1") || {
-	echo "Cannot find requested file $1. Exiting."
-	exit 1
-    }
-    local dest=${2:-$src}
     for x in inst_symlink inst_script inst_binary inst_simple; do
-	$x "$src" "$dest" && return 0
+       $x "$@" && return 0
     done
     return 1
 }