avoid re-downloading already properly pinned packages

.gitlab-ci.yml

@@ -5,7 +5,7 @@ iris-coq8.6:
   - coq
   script:
   # prepare
-  - . build/opam-ci.sh 'coq 8.6' 'coq-mathcomp-ssreflect 1.6.1'
+  - . build/opam-ci.sh coq 8.6 coq-mathcomp-ssreflect 1.6.1
   # build
   - 'time make -j8'
   cache:

build/opam-ci.sh

@@ -17,10 +17,16 @@ opam update
 
 # Install fixed versions of some dependencies
 echo
-for PIN in "${@}"
-do
-    echo "Applying pin: $PIN"
-    opam pin add $PIN -k version -y
+while (( "$#" )); do # while there are arguments left
+    PACKAGE="$1" ; shift
+    VERSION="$1" ; shift
+    # Check if the pin is already set
+    if opam pin list | fgrep "$PACKAGE.$VERSION " > /dev/null; then
+        echo "[opam-ci] $PACKAGE already pinned to $VERSION"
+    else
+        echo "[opam-ci] Pinning $PACKAGE to $VERSION"
+        opam pin add "$PACKAGE" "$VERSION" -k version -y
+    fi
 done
 
 # Install build-dependencies

build/opam-pins.sh

@@ -11,7 +11,11 @@ while read PACKAGE URL HASH; do
         # an MPI URL -- try doing recursive pin processing
         curl -f "$URL/raw/$HASH" 2> /dev/null | "$0"
     fi
-    echo "[opam-pins] Applying pin: $PACKAGE -> $URL#$HASH"
-    opam pin add "$PACKAGE.dev.$HASH" "$URL#$HASH" -k git -y -n
+    if opam pin list | fgrep "$PACKAGE.dev.$HASH " > /dev/null; then
+        echo "[opam-pins] $PACKAGE already at commit $HASH"
+    else
+        echo "[opam-pins] Applying pin: $PACKAGE -> $URL#$HASH"
+        opam pin add "$PACKAGE.dev.$HASH" "$URL#$HASH" -k git -y -n
+    fi
     echo
 done