Added protection against running when there are no packs available to unpack.

Prior to this change, the command is not idempotent, and in-fact the rsync will delete your object store on the second run.

Author: javabrett

git-unpack

@@ -1,12 +1,17 @@
 #!/bin/sh
 
-mkdir /tmp/tmpgit.$$
-GIT_DIR=/tmp/tmpgit.$$ git init
+if [ -f .git/objects/pack/*.pack ]; then
+  mkdir /tmp/tmpgit.$$
+  GIT_DIR=/tmp/tmpgit.$$ git init
 
-for pack in .git/objects/pack/*.pack; do
+  for pack in .git/objects/pack/*.pack; do
     GIT_DIR=/tmp/tmpgit.$$ git unpack-objects < $pack
-done
+  done
 
-rsync -a --info=PROGRESS2 --delete /tmp/tmpgit.$$/objects/ .git/objects/
+  rsync -a --info=PROGRESS2 --delete /tmp/tmpgit.$$/objects/ .git/objects/
 
-rm -fr /tmp/tmpgit.$$
+  rm -fr /tmp/tmpgit.$$
+else
+  echo "No packs to unpack"
+  exit 1
+fi