make sure the repo size is greater than the size of the symlink

Before, we'd check to make sure the repo, when checked through a symlink, is at
least as large as the repo *before* we checked it through the symlink. However,
this assumes that the repo can't shrink.

Really, this test exists to ensure we measure the repo size itself instead of
the size of the symlink; this commit changes the test to reflect this.

This test fails when 54d7e03303 is reverted.

fixes #4408

License: MIT
Signed-off-by: Steven Allen <steven@stebalien.com>

test/sharness/lib/test-lib.sh

@@ -363,10 +363,31 @@ generic_stat() {
     FreeBSD | Darwin | DragonFly)
       _STAT="stat -f %Sp"
       ;;
+    *)
+        echo "unsupported OS" >&2
+        exit 1
+        ;;
   esac
   $_STAT "$1" || echo "failed" # Avoid returning nothing.
 }
 
+# output a file's permission in human readable format
+file_size() {
+    case $(uname -s) in
+        Linux)
+            _STAT="stat --format=%s"
+            ;;
+        FreeBSD | Darwin | DragonFly)
+            _STAT="stat -f%z"
+            ;;
+        *)
+            echo "unsupported OS" >&2
+            exit 1
+            ;;
+    esac
+    $_STAT "$1"
+}
+
 test_check_peerid() {
   peeridlen=$(echo "$1" | tr -dC "[:alnum:]" | wc -c | tr -d " ") &&
   test "$peeridlen" = "46" || {

test/sharness/t0088-repo-stat-symlink.sh

@@ -15,14 +15,11 @@ test_expect_success "create symbolic link for IPFS_PATH" '
 
 test_init_ipfs
 
-# compare RepoSize when getting it directly vs via symbolic link
+# ensure that the RepoSize is reasonable when checked via a symlink.
 test_expect_success "'ipfs repo stat' RepoSize is correct with sym link" '
-  export IPFS_PATH="sym_link_target" &&
-  reposize_direct=$(ipfs repo stat | grep RepoSize | awk '\''{ print $2 }'\'') &&
-  export IPFS_PATH=".ipfs" &&
   reposize_symlink=$(ipfs repo stat | grep RepoSize | awk '\''{ print $2 }'\'') &&
-  echo "reposize_symlink: $reposize_symlink;  reposize_direct: $reposize_direct" &&
-  test $reposize_symlink -ge $reposize_direct
+  symlink_size=$(file_size .ipfs) &&
+  test "${reposize_symlink}" -gt "${symlink_size}"
 '
 
 test_done