Merge commit '7b0b9f603bb1215e2b7af23c2404d637b95a4988' as 'hadrian'

1 files changed, 74 insertions, 0 deletions

diff --git a/hadrian/build.cabal.sh b/hadrian/build.cabal.sh
new file mode 100644
index 0000000000..d2bdb857e1
--- /dev/null
+++ b/hadrian/build.cabal.sh
@@ -0,0 +1,74 @@
+#!/usr/bin/env bash
+
+CABAL=cabal
+
+set -euo pipefail
+
+# readlink on os x, doesn't support -f, to prevent the
+# need of installing coreutils (e.g. through brew, just
+# for readlink, we use the follownig substitute.
+#
+# source: http://stackoverflow.com/a/1116890
+function rl {
+    TARGET_FILE="$1"
+
+    cd "$(dirname "$TARGET_FILE")"
+    TARGET_FILE="$(basename "$TARGET_FILE")"
+
+    # Iterate down a (possible) chain of symlinks
+    while [ -L "$TARGET_FILE" ]
+    do
+        TARGET_FILE="$(readlink "$TARGET_FILE")"
+        cd "$(dirname "$TARGET_FILE")"
+        TARGET_FILE="$(basename "$TARGET_FILE")"
+    done
+
+    # Compute the canonicalized name by finding the physical path
+    # for the directory we're in and appending the target file.
+    PHYS_DIR="$(pwd -P)"
+    RESULT="$PHYS_DIR/$TARGET_FILE"
+    echo "$RESULT"
+}
+
+absoluteRoot="$(dirname "$(rl "$0")")"
+cd "$absoluteRoot"
+
+if ! type "$CABAL" > /dev/null; then
+    echo "Please make sure 'cabal' is in your PATH"
+    exit 2
+fi
+
+CABVERSTR=$("$CABAL" --numeric-version)
+
+CABVER=( ${CABVERSTR//./ } )
+
+if [ "${CABVER[0]}" -gt 2 -o "${CABVER[0]}" -eq 2 -a "${CABVER[1]}" -ge 1 ]; then
+    # New enough Cabal version detected, so let's use the superior new-build + new-run
+    # modes. Note that pre-2.1 Cabal does not support passing additional parameters
+    # to the executable (hadrian) after the separator '--', see #438.
+
+    "$CABAL" new-build --disable-profiling --disable-documentation -j exe:hadrian
+    "$CABAL" new-run hadrian --        \
+        --lint                         \
+        --directory "$absoluteRoot/.." \
+        "$@"
+
+else
+    # The logic below is quite fragile, but it's better than nothing for pre-2.1 Cabal.
+    echo "Old pre cabal 2.1 version detected. Falling back to legacy 'cabal sandbox' mode."
+
+    # Initialize sandbox if necessary
+    if ! ( "$CABAL" sandbox hc-pkg list > /dev/null 2>&1); then
+        "$CABAL" sandbox init
+        "$CABAL" sandbox add-source ../libraries/Cabal/Cabal
+        "$CABAL" install                \
+            --dependencies-only         \
+            --disable-library-profiling \
+            --disable-shared
+    fi
+
+    "$CABAL" run hadrian --            \
+        --lint                         \
+        --directory "$absoluteRoot/.." \
+        "$@"
+fi