Avoid unnecessary initramfs rebuilds

Fixes a bug, plus adds a line of output that explains why a rebuild
was needed.

1 files changed, 8 insertions, 3 deletions

diff --git a/src/initrd.sh b/src/initrd.sh
index b99aa4e..1414c89 100755
--- a/src/initrd.sh
+++ b/src/initrd.sh
@@ -19,7 +19,8 @@ force_rebuild()
 
 rebuild()
 {
-    [ ! -f "$apt_dependencies" ] || sudo apt-get install -q=10 --no-upgrade -y $(cat "$apt_dependencies")
+    [ ! -f "$apt_dependencies" ] ||
+        sudo apt-get install -q=10 --no-upgrade -y $(cat "$apt_dependencies")
 
     set -ex
     cp -f /boot/vmlinuz-"${kernel_version}" "$vmlinuz"
@@ -30,6 +31,10 @@ rebuild()
 
 if [ ! -e "$initrd" -o ! -e "$vmlinuz" ]; then
     rebuild
-elif [ "$(find_source_dirs -newer "$initrd" -print -quit)" ]; then
-    rebuild
+else
+    found=$(find_source_dirs -newer "$initrd" -print -quit)
+    if [ "$found" ]; then
+        echo "initrd.sh: rebuild forced: found modified source: $found"
+        rebuild
+    fi
 fi