Add a set of macros to further automate spec %prep tasks

- This adds two main macros (+ bunch of helpers) to automate the
  common case tasks in %prep:
  1) %autopatch which automatically applies all patches from a spec
  2) %autosetup which (optionally) takes care of it all, and (also
     optionally) sets up a git/hg repository of the unpacked source +
     applied patches as it  goes.
- This should be considered a starting point only, there are various
  things to improve. Eg we'd like to be able to make backups
  with plain patch (based on patch number maybe) and at least with git,
  we'd like to be able be (optionally) use 'git am' patching style
  to preserve original authors + commit messages etc.
- A noteworthy point here is that as these are fully implemented as
  macros, they are compatible with several older rpm versions as well.

1 files changed, 56 insertions, 0 deletions

diff --git a/macros.in b/macros.in
index e06146dbd..31bb70c78 100644
--- a/macros.in
+++ b/macros.in
@@ -68,6 +68,8 @@
 %__ssh			@__SSH@
 %__tar			@__TAR@
 %__unzip		@__UNZIP@
+%__git			@__GIT@
+%__hg			@__HG@
 
 #==============================================================================
 # ---- Build system path macros.
@@ -1022,5 +1024,59 @@ done \
 %__collection_sepolicy		%{__plugindir}/sepolicy.so
 %__collection_sepolicy_flags	1
 
+#------------------------------------------------------------------------------
+# Macros for further automated spec %setup and patch application
+
+# default to plain patch
+%__scm patch
+# meh, figure something saner
+%__scm_author rpm-build <rpm-build>
+
+# Plain patch (-m is unused)
+%__scm_apply_patch(qp:m:)\
+%{__patch} %{-p:-p%{-p*}} %{-q:-s}
+
+# Mercurial (aka hg)
+%__scm_setup_hg(q)\
+%{__hg} init %{-q} .\
+%{__hg} add %{-q} .\
+%{__hg} commit %{-q} --user "%{__scm_author}" -m "%{name}-%{version} base"
+
+%__scm_apply_hg(qp:m:)\
+%{__hg} import - %{-p:-p%{-p*}} %{-q} -m %{-m*} --user "%{__scm_author}"
+
+# Git
+%__scm_setup_git(q)\
+%{__git} init %{-q}\
+%{__git} add .\
+%{__git} commit %{-q} -a\\\
+	--author "%{__scm_author}" -m "%{name}-%{version} base"
+
+%__scm_apply_git(qp:m:)\
+%{__git} apply %{-p:-p%{-p*}} -\
+%{__git} commit %{-q} -a -m %{-m*} --author "%{__scm_author}"
+
+# Single patch application
+%apply_patch(qp:m:)\
+%{uncompress:%{1}} | %{expand:%__scm_apply_%{__scm} %{-q} %{-p:-p%{-p*}} %{-m:-m%{-m*}}}
+
+# Automatically apply all patches
+%autopatch(vp:)\
+%{lua:\
+for i, p in ipairs(patches) do\
+    print(rpm.expand("%apply_patch -m %{basename:"..p.."}  "..rpm.expand("%{!-v:-q} %{-p:-p%{-p*}} ")..p.."\\n"))\
+end}
+
+# One macro to (optionally) do it all.
+# -S<scm name>	Sets the used patch application style, eg '-S git' enables
+#           	usage of git repository and per-patch commits.
+# -A		Automatically apply all patches
+# -p<num>	Use -p<num> for patch application	
+%autosetup(a:b:cDn:TvAS:p:)\
+%setup %{-a} %{-b} %{-c} %{-D} %{-n} %{-T} %{!-v:-q}\
+%{-S:%global __scm %{-S*}}\
+%{-S:%{expand:%__scm_setup_%{-S*} %{!-v:-q}}}\
+%{-A:%autopatch %{-v} %{-p:-p%{-p*}}}
+
 # \endverbatim
 #*/