2 # tg2quilt.mk - TopGit-to-quilt functionality for debian/rules files
4 # This make(1) snippet facilitates the conversion of TopGit branches to
7 # It is intended to be included from debian/rules files of TopGit-using
10 # -include /usr/share/topgit/tg2quilt.mk
12 # The snippet exports the following targets. These targets only perform the
13 # describe behaviour when invoked from a TopGit repository (`tg summary -t`
14 # returns a non-empty set); used outside, they simply output informational
15 # messages but do not cause errors.
17 # tg-export: exports the TopGit patches into a quilt series under
19 # You may set TG_BRANCHES to a comma- or -space-separated
20 # subset of branches (but not comma-and-space-separated) to
21 # export (before including the file).
22 # If debian/patches/series already exists, the target
23 # will take note, blather a bit, and get out of the way.
25 # tg-clean: cleans the source tree, just like the debian/rules clean
26 # target, and invokes tg-rmdir
28 # tg-rmdir: tries to remove debian/patches, but only if there are no
29 # non-TopGit files under the directory.
30 # The heuristic is to find files that do not contain a line
31 # matchines /^tg:/, minus the series file. If any such files
32 # are found, an error occurs. Otherwise, the directory is
33 # removed. This means that edits to the series file are
36 # tg-forceclean: cleans the source tree, just like the debian/rules clean
37 # target, and forcefully removes the debian/patches
38 # directory in doing so. Yes, *force*-fully. WHAM!
40 # This file also hooks into the standard debian/rules and quilt targets such
41 # that tg-export is automatically invoked before quilt gets a chance to patch
42 # or unpatch the tree.
44 # The PATCHES_DIR variable can be set before including the file to override
45 # the default debian/patches location.
47 # More information, particularly for people working on TopGit-using packages,
48 # can be found in /usr/share/doc/topgit/HOWTO-tg2quilt.gz .
50 # Copyright © 2008 martin f. krafft <madduck@debian.org> Released under terms
51 # of the the Artistic Licence 2.0.
54 ifeq ($(shell tg summary -t),)
55 # This is not a TopGit branch, so just blubber a bit.
57 tg-export tg-clean tg-forceclean tg-rmdir:
58 @echo "E: The $@ target only works from a TopGit repository." >&2
61 # We are in a TopGit branch, so let the fun begin.
63 PATCHES_DIR ?= debian/patches
65 # Hook tg-export into quilt's make(1) snippet such that it gets executed
66 # before quilt patches or unpatches.
67 debian/stamp-patched: tg-export
68 unpatch: __tg-temp-export
70 @echo "Exporting TopGit branches to series so that quilt can clean up..." >&2
71 $(MAKE) $(MAKEFLAGS) -f debian/rules tg-export
73 # Set some tg-export-specific variables, e.g. default TG_BRANCHES to all
75 tg-export: TG_BRANCHES ?= $(shell tg summary -t)
76 # see make manual for this trick:
77 tg-export: __TG_COMMA := ,
78 tg-export: __TG_EMPTY :=
79 tg-export: __TG_SPACE := $(__TG_EMPTY) $(__TG_EMPTY)
81 ifeq ($(wildcard $(PATCHES_DIR)/series),)
82 # The series file does not exist, so we proceed normally
84 # tg-export will not work if the target dir already exists, so try to remove
85 # it by calling tg-rmdir
87 tg export -b $(subst $(__TG_SPACE),$(__TG_COMMA),$(TG_BRANCHES)) --quilt $(PATCHES_DIR)
89 # The series file already exists, so assume there is nothing to do.
91 @echo "I: TopGit patch series already exists, nothing to do." >&2
92 @echo "I: (invoke the \`tg-clean\` target to remove the series.)" >&2
93 @echo "I: (you can ignore this message during a \`tg-clean\` run.)" >&2
96 ifeq ($(wildcard $(PATCHES_DIR)),)
97 # No patch directory, so nothing to do:
102 # There is a patch directory, let's try to clean it out:
103 tg-rmdir: __TG_FILES := $(shell find $(PATCHES_DIR) -type f -a -not -path \*/series \
104 | xargs grep -l '^tg:')
106 # remove all files whose contents matches /^tg:/
107 test -n "$(__TG_FILES)" && rm $(__TG_FILES) || :
108 # remove the series file
109 test -f $(PATCHES_DIR)/series && rm $(PATCHES_DIR)/series || :
110 # try to remove directories
111 find $(PATCHES_DIR) -type d | tac | xargs rmdir 2>/dev/null || :
112 # fail if the directory could not be removed and still exists
113 @test ! -d $(PATCHES_DIR) || { \
114 echo "E: $(PATCHES_DIR) contains non-TopGit-generated files:" >&2; \
115 find $(PATCHES_DIR) -type f -printf 'E: %P\n' >&2; \
120 # Make sure that we try to clean up the patches directory last
122 $(MAKE) $(MAKEFLAGS) -f debian/rules tg-rmdir
125 test -d debian/patches && rm -r $(PATCHES_DIR) || :
129 .PHONY: tg-clean tg-export tg-forceclean tg-rmdir
131 # vim:ft=make:ts=8:noet