try to avoid running mkinitramfs redundantly

1 files changed, 16 insertions, 1 deletions

diff --git a/src/mkinitramfs-samizdat b/src/mkinitramfs-samizdat
index 4852daa..4b46ce4 100755
--- a/src/mkinitramfs-samizdat
+++ b/src/mkinitramfs-samizdat
@@ -11,16 +11,31 @@ loudly()
     "$@")
 }
 
+up_to_date()
+{
+    local found system_initrd
+    system_initrd=${1%$OUTPUT_TAG}
+    [ -e "$1" ] || return
+    found=$(find "$samizdat_initramfs_conf_dir" \
+                 "$samizdat_initrd_files_dir" \
+                 "$system_initrd" \
+                 -type f -newer "$1" -print -quit) || return
+    [ -z "$found" ]
+}
+
 f()
 {
     OUTPUT=/boot/initrd.img-$1${OUTPUT_TAG}
+    ([ -z "$OUTPUT_TAG" ] || ! up_to_date "$OUTPUT") &&
     /usr/sbin/mkinitramfs \
-         -d /usr/local/lib/samizdat-rhizome/initramfs-tools/ \
+         -d "$samizdat_initramfs_conf_dir" \
          -o "$OUTPUT" \
          -k "$1" || return
     loudly ln -sf "${OUTPUT#/}" /initrd.img
 }
 
+. samizdat-paths.sh
+
 OUTPUT_TAG=.samizdat
 while [ $# -gt 0 ]
 do