fixup! cache: when fetching from cache, add missing symlink for every…

… checksum found in opam file

tests/reftests/archive.test

@@ -354,7 +354,7 @@ The following actions will be performed:
 Done.
 ### sh check-cache.sh
 MD5: archive, with matching checksum
-SHA256: not found
+SHA256: link, to md5 archive
 ### opam remove good-md5-good-sha256
 The following actions will be performed:
 === remove 1 package
@@ -405,7 +405,7 @@ The following actions will be performed:
 Done.
 ### sh check-cache.sh
 MD5: archive, with matching checksum
-SHA256: not found
+SHA256: link, to md5 archive
 ### opam remove good-sha256-good-md5
 The following actions will be performed:
 === remove 1 package
@@ -962,7 +962,7 @@ The following actions will be performed:
 -> installed good-sha256-good-md5.1
 Done.
 ### sh check-cache.sh
-MD5: not found
+MD5: link, to sha256 archive
 SHA256: archive, with matching checksum
 ### opam clean --download-cache
 Clearing cache of downloaded files
@@ -1028,15 +1028,19 @@ The following actions will be performed:
   - install good-sha256-good-md5 1
 
 <><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>
--> retrieved good-sha256-good-md5.1  (cached)
+[ERROR] Conflicting file hashes, or broken or compromised cache!
+          - sha256=99a0bdda5cc48eef1f53c6831c06c4b1d51bc746e68a84efc71785f00d7e927e (MISMATCH)
+          - md5=2c729f293240d43f46058280c2ac00e3 (MISMATCH)
+
+-> retrieved good-sha256-good-md5.1  (file://${BASEDIR}/archive.tgz)
 -> installed good-sha256-good-md5.1
 Done.
 ### sh check-cache.sh
-MD5: archive, with mismatching checksum
+MD5: link, to sha256 archive
 SHA256: archive, with matching checksum
 ### :II:4: corrupt sha256 archive in cache
 ### sh check-cache.sh
-MD5: archive, with mismatching checksum
+MD5: link, to sha256 archive
 SHA256: archive, with matching checksum
 ### opam remove good-sha256-good-md5
 The following actions will be performed:
@@ -1050,7 +1054,7 @@ Done.
 ### rm "$ARCHIVE_SHA256_PATH"
 ### tar czf "$ARCHIVE_SHA256_PATH" check-cache.sh
 ### sh check-cache.sh
-MD5: archive, with matching checksum
+MD5: link, to sha256 archive
 SHA256: archive, with mismatching checksum
 ### # what happens here is that sha256 is checked first, there is a mismatch on sha256 archive (checking its sha256 & md5), so it is remove, returns file not available, and then it downloads the archive from url
 ### opam install good-sha256-good-md5 | '[0-9a-z]{32,64}' -> 'hash'

tests/reftests/extrasource.test

@@ -429,7 +429,7 @@ The following actions will be performed:
 Done.
 ### sh check-cache.sh
 MD5: patch, with matching checksum
-SHA256: not found
+SHA256: link, to md5 patch
 ### opam remove good-md5-good-sha256
 The following actions will be performed:
 === remove 1 package
@@ -480,7 +480,7 @@ The following actions will be performed:
 Done.
 ### sh check-cache.sh
 MD5: patch, with matching checksum
-SHA256: not found
+SHA256: link, to md5 patch
 ### opam remove good-sha256-good-md5
 The following actions will be performed:
 === remove 1 package
@@ -1090,7 +1090,7 @@ The following actions will be performed:
 -> installed good-sha256-good-md5.1
 Done.
 ### sh check-cache.sh
-MD5: not found
+MD5: link, to sha256 patch
 SHA256: patch, with matching checksum
 ### opam clean --download-cache
 Clearing cache of downloaded files
@@ -1120,11 +1120,11 @@ The following actions will be performed:
 Done.
 ### sh check-cache.sh
 MD5: patch, with matching checksum
-SHA256: not found
+SHA256: link, to md5 patch
 ### :III:c: corrupt md5 patch in cache
 ### sh check-cache.sh
 MD5: patch, with matching checksum
-SHA256: not found
+SHA256: link, to md5 patch
 ### opam remove good-sha256-good-md5
 The following actions will be performed:
 === remove 1 package
@@ -1136,7 +1136,7 @@ Done.
 ### cp check-cache.sh "$PATCH_MD5_PATH"
 ### sh check-cache.sh
 MD5: patch, with mismatching checksum
-SHA256: not found
+SHA256: link, to md5 patch
 ### opam install good-sha256-good-md5 | '[0-9a-z]{32,64}' -> 'hash'
 The following actions will be performed:
 === install 1 package