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1 # -*- mode: makefile; coding: utf-8 -*-
2 # Copyright © 2007-2008 Anders Kaseorg <andersk@mit.edu> and
3 #                       Tim Abbott <tabbott@mit.edu>
4 #
5 # This program is free software; you can redistribute it and/or
6 # modify it under the terms of the GNU General Public License as
7 # published by the Free Software Foundation; either version 2, or (at
8 # your option) any later version.
9 #
10 # This program is distributed in the hope that it will be useful, but
11 # WITHOUT ANY WARRANTY; without even the implied warranty of
12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13 # General Public License for more details.
14 #
15 # You should have received a copy of the GNU General Public License
16 # along with this program; if not, write to the Free Software
17 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18 # 02111-1307 USA.
19
20 # Don't include divert.mk in your rules files directly; instead use
21 # config-package.mk.
22
23 # divert.mk handles the low-level diversion logic.  It includes
24 # divert.sh.in in the postinst and prerm scripts, and adds 
25
26 ifndef _cdbs_rules_divert
27 _cdbs_rules_divert = 1
28
29 include /usr/share/cdbs/1/rules/debhelper.mk
30
31 CDBS_BUILD_DEPENDS := $(CDBS_BUILD_DEPENDS), config-package-dev (>= 4.5~)
32
33 # divert.sh.in is included in the postinst/prerm scripts of packages
34 # installing diversions using config-package-dev.
35 DEB_DIVERT_SCRIPT = /usr/share/config-package-dev/divert.sh.in
36 # script used to encode the path of a file uniquely in a valid virtual
37 # package name.
38 DEB_DIVERT_ENCODER = /usr/share/config-package-dev/encode
39
40 DEB_DIVERT_PACKAGES += $(foreach package,$(DEB_ALL_PACKAGES), \
41     $(if $(DEB_TRANSFORM_FILES_$(package)),$(package), \
42     $(if $(DEB_REMOVE_FILES_$(package)),$(package), \
43     $(if $(DEB_UNREMOVE_FILES_$(package)),$(package), \
44     $(if $(DEB_UNDIVERT_FILES_$(package)),$(package), \
45     $(if $(DEB_DIVERT_FILES_$(package)),$(package)))))))
46
47 ifeq ($(DEB_DIVERT_EXTENSION),)
48 DEB_DIVERT_EXTENSION = .divert
49 endif
50
51 # Replace only the last instance of DEB_DIVERT_EXTENSION in the
52 # filename, to make it possible to divert /path/foo.divert to
53 # foo.divert.divert-orig
54 divert_files_replace_name = $(shell echo $(1) | perl -pe 's/(.*)\Q$(DEB_DIVERT_EXTENSION)\E/$$1$(2)/')
55
56 # Transform a full path into the path it should be diverted to if it's
57 # removed
58 remove_files_name = /usr/share/$(cdbs_curpkg)/$(shell $(DEB_DIVERT_ENCODER) $(1))
59
60 dh_compat_5 := $(shell if [ '$(DH_COMPAT)' -ge 5 ]; then echo y; fi)
61
62 reverse = $(foreach n,$(shell seq $(words $(1)) -1 1),$(word $(n),$(1)))
63 reverse_dh_compat_5 = $(if $(dh_compat_5),$(call reverse,$(1)),$(1))
64
65 debian-divert/%: package = $(subst debian-divert/,,$@)
66 debian-divert/%: divert_files = $(DEB_DIVERT_FILES_$(package)) $(DEB_TRANSFORM_FILES_$(package))
67 debian-divert/%: divert_remove_files = $(DEB_REMOVE_FILES_$(package))
68 debian-divert/%: divert_undivert_files = $(DEB_UNDIVERT_FILES_$(package))
69 debian-divert/%: divert_unremove_files = $(DEB_UNREMOVE_FILES_$(package))
70 debian-divert/%: divert_files_all = $(strip $(divert_files) $(divert_remove_files) $(divert_undivert_files) $(divert_unremove_files))
71 debian-divert/%: divert_files_thispkg = $(strip $(divert_files) $(divert_remove_files))
72 $(patsubst %,debian-divert/%,$(DEB_DIVERT_PACKAGES)) :: debian-divert/%:
73 #   Writing shell scripts in makefiles sucks.  Remember to $$ shell
74 #   variables and include \ at the end of each line.
75 # Add code to postinst to add/remove diversions as appropriate
76         set -e; \
77         { \
78             sed 's/#PACKAGE#/$(cdbs_curpkg)/g; s/#DEB_DIVERT_EXTENSION#/$(DEB_DIVERT_EXTENSION)/g' $(DEB_DIVERT_SCRIPT); \
79             $(if $(divert_files_all), \
80                 echo 'if [ "$$1" = "configure" ]; then'; \
81                 $(foreach file,$(divert_undivert_files), \
82                     echo "    check_undivert_unlink $(call divert_files_replace_name,$(file), )"; )\
83                 $(foreach file,$(divert_unremove_files), \
84                     echo "    check_undivert_unremove $(file) $(call remove_files_name,$(file))"; )\
85                 $(foreach file,$(divert_files), \
86                     echo "    divert_link $(call divert_files_replace_name,$(file), )";) \
87                 $(foreach file,$(divert_remove_files), \
88                     mkdir -p debian/$(cdbs_curpkg)/usr/share/$(cdbs_curpkg); \
89                     echo "    divert_remove $(file) $(call remove_files_name,$(file))";) \
90                 echo 'fi'; \
91             ) \
92         } >> $(CURDIR)/debian/$(cdbs_curpkg).postinst.debhelper
93 # Add code to prerm script to undo diversions when package is removed.
94         set -e; \
95         { \
96             $(if $(dh_compat_5),, \
97                 if [ -e $(CURDIR)/debian/$(cdbs_curpkg).prerm.debhelper ]; then \
98                     cat $(CURDIR)/debian/$(cdbs_curpkg).prerm.debhelper; \
99                 fi;) \
100             sed 's/#PACKAGE#/$(cdbs_curpkg)/g; s/#DEB_DIVERT_EXTENSION#/$(DEB_DIVERT_EXTENSION)/g' $(DEB_DIVERT_SCRIPT); \
101             $(if $(divert_files_thispkg), \
102                 echo 'if [ "$$1" = "remove" ]; then'; \
103                 $(foreach file,$(call reverse_dh_compat_5,$(divert_files)), \
104                     echo "    undivert_unlink $(call divert_files_replace_name,$(file), )";) \
105                 $(foreach file,$(call reverse_dh_compat_5,$(divert_remove_files)), \
106                     echo "    undivert_unremove $(file) $(cdbs_curpkg)";) \
107                 echo 'fi'; \
108             ) \
109             $(if $(dh_compat_5), \
110                 if [ -e $(CURDIR)/debian/$(cdbs_curpkg).prerm.debhelper ]; then \
111                     cat $(CURDIR)/debian/$(cdbs_curpkg).prerm.debhelper; \
112                 fi;) \
113         } >> $(CURDIR)/debian/$(cdbs_curpkg).prerm.debhelper.new
114         mv $(CURDIR)/debian/$(cdbs_curpkg).prerm.debhelper.new \
115             $(CURDIR)/debian/$(cdbs_curpkg).prerm.debhelper
116 # Add an encoding of the names of the diverted files to the Provides:
117 # and Conflicts: lists.  This prevents two packages diverting the same
118 # file from being installed simultaneously (it cannot work, and this
119 # produces a much less ugly error).  Requires in debian/control:
120 #   Provides: $(diverted-files)
121 #   Conflicts: $(diverted-files)
122         set -e; \
123         { \
124             echo -n "diverted-files="; \
125             $(foreach file,$(divert_files_thispkg),\
126                 echo -n "diverts-"; \
127                 ${DEB_DIVERT_ENCODER} "$(call divert_files_replace_name,$(file))"; \
128                 echo -n ", ";) \
129             echo; \
130         } >> $(CURDIR)/debian/$(cdbs_curpkg).substvars
131
132 $(patsubst %,binary-post-install/%,$(DEB_DIVERT_PACKAGES)) :: binary-post-install/%: debian-divert/%
133
134 endif
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