build: Rename perl scripts to have a .pl extension

This allows to easily replace the shebang at installation time to use
the system perl interpreter and will make it easier to analyze all
perl scripts in the source tree.

Makefile.am

@@ -34,7 +34,7 @@ EXTRA_DIST = \
 	doc/README.feature-removal-schedule \
 	doc/coding-style.txt \
 	doc/frontend.txt \
-	doc/lcov-inject \
+	doc/lcov-inject.pl \
 	doc/triggers.txt \
 	debian/changelog \
 	debian/compat \
@@ -98,7 +98,7 @@ LCOV_CAPTURE_OPTS = $(LCOV_OPTS) --no-recursion \
 	-d $(top_builddir)/lib/dpkg \
 	-d $(top_builddir)/src \
 	-d $(top_builddir)/utils
-LCOV_INJECT = $(PERL) -i $(top_srcdir)/doc/lcov-inject
+LCOV_INJECT = $(PERL) -i $(top_srcdir)/doc/lcov-inject.pl
 
 coverage: all
 	: # Remove coverage data from any previous run

doc/lcov-inject

@@ -1,6 +1,6 @@
 #!/usr/bin/perl
 #
-# lcov-inject
+# lcov-inject.pl
 #
 # Copyright © 2014 Guillem Jover <guillem@debian.org>
 #

dselect/methods/Makefile.am

@@ -18,6 +18,12 @@ nobase_dist_methods_DATA = \
 	multicd/desc.multi_mount \
 	multicd/desc.multi_nfs
 
+nobase_methods_SCRIPTS = \
+	ftp/setup \
+	ftp/update \
+	ftp/install \
+	$(nil)
+
 nobase_dist_methods_SCRIPTS = \
 	disk/setup \
 	disk/update \
@@ -25,9 +31,6 @@ nobase_dist_methods_SCRIPTS = \
 	floppy/setup \
 	floppy/update \
 	floppy/install \
-	ftp/setup \
-	ftp/update \
-	ftp/install \
 	multicd/setup \
 	multicd/update \
 	multicd/install
@@ -35,7 +38,23 @@ nobase_dist_methods_SCRIPTS = \
 perllibdir = $(PERL_LIBDIR)
 nobase_dist_perllib_DATA = Dselect/Ftp.pm
 
-EXTRA_DIST = multicd/README.multicd
+EXTRA_DIST = \
+	ftp/setup.pl \
+	ftp/update.pl \
+	ftp/install.pl \
+	multicd/README.multicd
+
+CLEANFILES = \
+	$(nobase_methods_SCRIPTS) \
+	$(nil)
+
+do_perl_subst = $(AM_V_GEN) \
+	sed -e "s:^\#![[:space:]]*/usr/bin/perl:\#!$(PERL):"
+
+%: %.pl Makefile
+	@test -d `dirname $@` || $(MKDIR_P) `dirname $@`
+	$(do_perl_subst) <$< >$@
+	$(AM_V_at) chmod +x $@
 
 install-data-local:
 	$(MKDIR_P) $(DESTDIR)$(admindir)/methods/mnt

dselect/methods/ftp/.gitignore

@@ -0,0 +1,3 @@
+install
+setup
+update