Add symlink tester for real_path and sonar-scanner

diff --git a/misc/symlink-tester.sh b/misc/symlink-tester.sh
new file mode 100755 (executable)
index 0000000..bab955e
--- /dev/null
+++ b/misc/symlink-tester.sh
@@ -0,0 +1,59 @@
+#!/usr/bin/env bash
+
+usage() {
+    echo usage: $0 path/to/sonar-scanner
+    exit 1
+}
+
+test -f "$1" && test -x "$1" || usage
+
+scanner=$1
+
+if type mktemp &>/dev/null; then
+    tempdir=$(mktemp -d)
+    tempdir=$(cd "$tempdir"; pwd -P)
+else
+    tempdir=/tmp/"$(basename "$0")-$$"
+    mkdir -p "$tempdir"
+fi
+
+cleanup() {
+    rm -fr "$tempdir"
+}
+
+trap 'cleanup; exit 1' 1 2 3 15
+trap 'cleanup; exit 0' 0
+
+abspath() {
+    (cd "$(dirname "$1")"; echo $PWD/"$(basename "$1")")
+}
+
+verify() {
+    printf '%s -> ' "$1"
+    shift
+    "$@" &>/dev/null && echo ok || echo failed
+}
+
+relpath_to_root() {
+    (
+    cd "$1"
+    relpath=.
+    while test "$PWD" != /; do
+        cd ..
+        relpath=$relpath/..
+    done
+    echo $relpath
+    )
+}
+
+ln -s "$(abspath "$scanner")" "$tempdir"/scanner
+verify 'launch from abs symlink to abs path' "$tempdir"/scanner -h
+
+ln -s "$(relpath_to_root "$tempdir")$(abspath "$scanner")" "$tempdir"/scanner-rel
+verify 'symlink to rel path is valid' test -e "$tempdir"/scanner-rel
+verify 'launch from abs symlink to rel path' "$tempdir"/scanner-rel -h
+
+mkdir "$tempdir/x"
+ln -s ../scanner "$tempdir"/x/scanner
+verify 'symlink to rel symlink is valid' test -f "$tempdir"/x/scanner
+verify 'launch from abs symlink that is rel symlink to abs path' "$tempdir"/x/scanner -h