# vim:ft=automake
#
# Adjust post-install permissions settings.  This rule works off two
# specially-formatted variables, INSTALLPERMS_exec and INSTALLPERMS_data. 
# Each is a whitespace-separated list of commands, all of which are either
# a variable assignment or a filename.  Three variables are available:
#
#  - dest= sets the destination directory to e.g., $(sbindir)
#  - chown= controls changes in ownership; value is first argument to chown
#  - chmod= controls changes in permissions; value is first argument to chmod
#
# The following special cases are available:
# 	amanda:setuid = $(BINARY_OWNER):$(SETUID_GROUP)
# 	root:setuid = root:$(SETUID_GROUP)
# These variables might otherwise have problems with whitespace in the user/group
# names.
#
# when a filename is seen, the currently active variables are applied.
#
# Note that scripts are data, not executables!
#
# EXAMPLE
#
# sbin_PROGRAMS = foo bar bing
# libexec_PROGRAMS = pro gram
# sbin_SCRIPTS = sk ript
# INSTALLPERMS_exec = \
# 	dest=$(sbindir) chown=amanda chmod= \
# 		foo bar \
# 	chmod=07450 \
# 		bing
# 	dest=$(libexecdir) chmod= \
# 		$(libexec_PROGRAMS)
# INSTALLPERMS_data = \
# 	dest=$(sbindir) chown=amanda chmod= \
# 		$(sbin_SCRIPTS)
#
# This whole operation is not required when making builds for packaging,
# and can be disabled with --disable-installperms, via the WANT_INSTALLPERMS
# AM_CONDITIONAL.  When disabled, the file 'installperms.sh' in the top-level
# build directory is populated with a format suitable for shell interpretation,
# with lines like this:
#   installperm "amanda:disk" "04750" "/usr/local/sbin/bing"
# the arguments being, respectively, owner:group, mode, and filename.  There will
# be exactly one line for each file which has specific permissions.  The intention
# is that this file be used by packaging scripts to set correct permissions at install
# time.  Note that files which have no special permissions requirements do not appear 
# in this file at all, due to limitations of Automake.

# sed expression to strip leading directories from a filename; this converts e.g.,
# src/foo/bar.so to bar.so.
strip_leading_dirs=s|^.*/||

# define a snippet of the scripts below to either perform a chown/chmod operation,
# or record that operation in the logfile.  On entry to the snippet, $$dest is the
# destination directory, $$cmd is the srcdir-relative pathname of the target file,
# $$chown is the ownership, and $$chmod is the permission pattern.
if WANT_INSTALLPERMS
do_file=pa="$(DESTDIR)$$dest"/`echo "$$cmd"|sed '$(strip_leading_dirs)'|sed '$(transform)'`; \
    if test -n "$$chown"; then \
	echo chown "$$chown" "$$pa"; \
	chown "$$chown" "$$pa" || exit 1; \
    fi; \
    if test -n "$$chmod"; then \
	echo chmod "$$chmod" "$$pa"; \
	chmod "$$chmod" "$$pa" || exit 1; \
    fi 
else
installperms_sh="$(top_builddir)/installperms.sh"
do_file=pa="$$dest"/`echo "$$cmd"|sed '$(strip_leading_dirs)'|sed '$(transform)'`; \
    echo "installperm \"$$chown\" \"$$chmod\" \"$$pa\"" >> "$(installperms_sh)"
DISTCLEANFILES += $(installperms_sh)
endif

do_installperms=dest=; chown=; chmod=; \
	for cmd in $$installperms; do \
	    case "$$cmd" in \
		chown=amanda:setuid) \
		    echo "  ($$cmd)"; chown="$(BINARY_OWNER):$(SETUID_GROUP)";; \
		chown=root:setuid) \
		    echo "  ($$cmd)"; chown="root:$(SETUID_GROUP)";; \
		dest=*|chown=*|chmod=*) \
			echo "  ($$cmd)"; eval $$cmd;; \
	    	*) $(do_file) ;; \
	    esac; \
	done

installperms-exec:
	@installperms="$(INSTALLPERMS_exec)"; \
	test -n "$$installperms" && echo "Setting installation permissions on executables"; \
	$(do_installperms)

installperms-data:
	@installperms="$(INSTALLPERMS_data)"; \
	test -n "$$installperms" && echo "Setting installation permissions on data"; \
	$(do_installperms)

install-exec-hook: installperms-exec
install-data-hook: installperms-data

# define a rule to initialize the installperms manifest file
if WANT_INSTALLPERMS
installperms-init:
else
installperms-init:
	rm -f "$(installperms_sh)"
endif