Improve scripts/add-revions.sh

The need to pass a `BUILT_REPO` arg is very confusing and it is small enough to just DL the latest to a temp dir.

This change also only uses the `BUILT_REPO` if there is no existing revision.  If there is a revision it copies the `.cabal` file from there (in case it is not in the BUILT_REPO yet).

Also uses `date -u` instead of `date --utc` so that we don't have to install `gdate` on macOS to make it work.

scripts/add-revision.sh

@@ -5,7 +5,7 @@ set -o pipefail
 SCRIPT_DIR=$(dirname "$(which "$0")")
 
 function usage {
-  echo "Usage $(basename "$0") BUILT_REPO PKG_NAME PKG_VERSION"
+  echo "Usage $(basename "$0") PKG_NAME PKG_VERSION"
   echo "  Adds a new revision with the existing cabal file for that package"
   echo "  version. Requires a built repository. Does not commit."
   exit
@@ -28,15 +28,18 @@ done
 
 shift $((OPTIND - 1))
 
-BUILT_REPO=$1
-PKG_NAME=$2
-PKG_VERSION=$3
+PKG_NAME=$1
+PKG_VERSION=$2
 
-if ! shift 3; then
+if ! shift 2; then
   usage
   exit 1
 fi
 
+BUILT_REPO=$(mktemp -d)
+mkdir -p $BUILT_REPO/index
+curl -L https://input-output-hk.github.io/cardano-haskell-packages/01-index.tar.gz | tar -C $BUILT_REPO/index -xz
+
 META_DIR="_sources/$PKG_NAME/$PKG_VERSION"
 META_FILE="$META_DIR/meta.toml"
 REVISIONS_DIR="$META_DIR/revisions"
@@ -63,10 +66,11 @@ else
   LATEST_REVISION=$(echo "$CURRENT_REVISIONS" | sort | tail -n1)
   LATEST_REVISION_NUMBER=$(basename "$LATEST_REVISION" | cut -f 1 -d '.')
   NEW_REVISION_NUMBER=$((LATEST_REVISION_NUMBER+1))
+  CURRENT_CABAL_FILE="$REVISIONS_DIR/$LATEST_REVISION_NUMBER.cabal"
 fi
 
 NEW_CABAL_FILE="$REVISIONS_DIR/$NEW_REVISION_NUMBER.cabal"
-echo "Moving $CURRENT_CABAL_FILE to $NEW_CABAL_FILE"
+echo "Copying $CURRENT_CABAL_FILE to $NEW_CABAL_FILE"
 
 mkdir -p "$REVISIONS_DIR"
 cp "$CURRENT_CABAL_FILE" "$NEW_CABAL_FILE"

scripts/current-timestamp.sh

@@ -1,8 +1,3 @@
 #!/usr/bin/env bash
 
-# Use gnu-tar and gnu-date regardless of whether the OS is Linux
-# or BSD-based.  The correct command will be assigned to TAR and DATE
-# variables.
-source "$(dirname "$(which "$0")")/use-gnu-tar.sh"
-
-"$DATE" --utc +%Y-%m-%dT%H:%M:%SZ
+date -u +%Y-%m-%dT%H:%M:%SZ

scripts/use-gnu-tar.sh

@@ -1,12 +1,8 @@
 #!/usr/bin/env bash
 
-export DATE="date"
 export TAR="tar"
 
 if [[ "$(uname -s)" == "Darwin" ]]; then
-  if [[ "$(which date)" == "/bin/date" ]]; then
-    export DATE="gdate"
-  fi
   if [[ "$(which tar)" == "/usr/bin/tar" ]]; then
     export TAR="gtar"
   fi