[Buildroot] [PATCH 2/3] support/download: properly catch missing hashes

[Yann E. MORIN]

When checking hashes reports no hash for a file, and this is treated as
an error (now: because BR2_ENFORCE_CHECK_HASH is set; later: becasue
that will be the new and only behaviour), exit promptly in error.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998 at free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>
---
 support/download/dl-wrapper | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/support/download/dl-wrapper b/support/download/dl-wrapper
index 3b30840..d93a159 100755
--- a/support/download/dl-wrapper
+++ b/support/download/dl-wrapper
@@ -48,10 +48,19 @@ main() {
         error "no hash-file specified, use -H\n"
     fi
 
-    # If the output file already exists, do not download it again
+    # If the output file already exists and:
+    # - there's no .hash file: do not download it again and exit promptly
+    # - matches all its hashes: do not download it again and exit promptly
+    # - fails at least one of its hashes: force a re-download
+    # - there's no hash (but a .hash file): consider it a hard error
     if [ -e "${output}" ]; then
         if support/download/check-hash ${quiet} "${hfile}" "${output}" "${output##*/}"; then
             exit 0
+        elif [ ${?} -eq 2 ]; then
+            # Do not remove the file, otherwise it might get re-downloaded
+            # from a later location (i.e. primary -> upstream -> mirror).
+            # Do not print a message, check-hash already did
+            exit 2
         fi
         rm -f "${output}"
         warn "Re-downloading '%s'...\n" "${output##*/}"
-- 
1.9.1