dracut-lib.sh: add copytree(), use it where applicable

copytree() recursively copies the contents of SRC into DEST.

If DEST doesn't exist it is created; if it exists the contents of SRC
get merged into it (duplicate files are overwritten).

modules.d/45ifcfg/write-ifcfg.sh

@@ -225,6 +225,6 @@ echo "files /var/lib/dhclient" >> /run/initramfs/rwtab
 {
     cp /tmp/net.* /run/initramfs/
     cp /tmp/net.$netif.resolv.conf /run/initramfs/state/etc/resolv.conf
-    cp -a -t /run/initramfs/state/etc/sysconfig/network-scripts/ /tmp/ifcfg/*
+    copytree /tmp/ifcfg /run/initramfs/state/etc/sysconfig/network-scripts
     cp /tmp/ifcfg-leases/* /run/initramfs/state/var/lib/dhclient
 } > /dev/null 2>&1

modules.d/90livenet/fetch-liveupdate.sh

@@ -27,6 +27,5 @@ if [ $? != 0 ]; then
     warn "url: $url"
     return 1
 fi
-rm -rf /updates
-mv -f /updates.tmp.$$ /updates
+copytree /updates.tmp.$$ /updates
 mv /tmp/liveupdates.info /tmp/liveupdates.done

modules.d/99base/dracut-lib.sh

@@ -532,6 +532,17 @@ mkuniqdir() {
     echo "${retdir}"
 }
 
+# Copy the contents of SRC into DEST, merging the contents of existing
+# directories (kinda like rsync, or cpio -p).
+# Creates DEST if it doesn't exist. Overwrites files with the same names.
+#
+# copytree SRC DEST
+copytree() {
+    local src="$1" dest="$2"
+    mkdir -p "$dest"; dest=$(readlink -e -q "$dest")
+    ( cd "$src"; cp -af . -t "$dest" )
+}
+
 # Evaluates command for UUIDs either given as arguments for this function or all
 # listed in /dev/disk/by-uuid.  UUIDs doesn't have to be fully specified.  If
 # beginning is given it is expanded to all matching UUIDs.  To pass full UUID to

modules.d/99img-lib/img-lib.sh

@@ -53,7 +53,7 @@ unpack_fs() {
     local img="$1" outdir="$2" mnt="$(mkuniqdir /tmp unpack_fs.)"
     mount -o loop $img $mnt || { rmdir $mnt; return 1; }
     mkdir -p $outdir; outdir="$(cd $outdir; pwd)"
-    ( cd $mnt; cp -a -t $outdir . )
+    copytree $mnt $outdir
     umount $mnt
     rmdir $mnt
 }