Makefile: Make Perl path install-time configurable

Add support for specifying the Perl interpreter path used in installed
Perl scripts. If no path is specified, the default '/usr/bin/perl' is
used.

Set variable LCOV_PERL_PATH to specify a different path, for example:

  make install LCOV_PERL_PATH=/usr/local/bin/perl

Unset this variable to keep the current path:

  make install LCOV_PERL_PATH=

Signed-off-by: Peter Oberparleiter <oberpar@linux.ibm.com>

Author: oberpar

Makefile

@@ -15,6 +15,10 @@ VERSION := $(shell bin/get_version.sh --version)
 RELEASE := $(shell bin/get_version.sh --release)
 FULL    := $(shell bin/get_version.sh --full)
 
+# Set this variable during 'make install' to specify the Perl interpreter used in
+# installed scripts, or leave empty to keep the current interpreter.
+export LCOV_PERL_PATH := /usr/bin/perl
+
 PREFIX  := /usr/local
 
 CFG_DIR := $(PREFIX)/etc

bin/install.sh

@@ -36,6 +36,10 @@ do_install()
 
   install -d $(dirname $TARGET)
   install -p $PARAMS $SOURCE $TARGET
+  if [ -n "$LCOV_PERL_PATH" ] ; then
+    # Replace Perl interpreter specification
+    sed -e "1 s%^#\!.*perl.*$%#\!$LCOV_PERL_PATH%" -i $TARGET
+  fi
 }
 
 
@@ -51,7 +55,7 @@ do_uninstall()
   # Does target exist?
   if test -r $TARGET ; then
     # Is target of the same version as this package?
-    if diff -I '^our \$lcov_version' -I '^\.TH ' $SOURCE $TARGET >/dev/null; then
+    if diff -I '^our \$lcov_version' -I '^\.TH ' -I '^#!' $SOURCE $TARGET >/dev/null; then
       rm -f $TARGET
     else
       echo WARNING: Skipping uninstall for $TARGET - versions differ! >&2