[PATCH] mk/git-package.mk (Re: migrate to git for emacs-current (24.0.50) ?

  I have experimental patch for adding cache capability for
git-package.mk.  This is reminded by emacs-current conversion
to git as attached mail.  The code is derived from
cvs-package.mk.

I believe git-package.mk is used by following 4 now.
  cinelerra-cv
  darcs-to-git
  pan2-git
  xf86-video-nv-current
darcs-to-git does not support x86_64, so it is not confirmed yet.
Others should be OK with this patch (pan2-git needs to add one line).

| From: Makoto Fujiwara <[email protected]>
| Subject: migrate to git for emacs-current (24.0.50) ?
| Date: Tue, 08 Jun 2010 01:32:59 +0900

MEF> It doesn't seems to me the cvs repository which wip/emacs-current 
MEF> downloads from, is being updated.

MEF> Shall I convert its cvs to git repository ?

MEF> It may download huge directory and takes time. But I
MEF> don't think there is another way to go :-)

MEF> ------
MEF> modena@makoto 01:24:24/100608(..wip/emacs-current)% du -sk  work/emacs/.git
MEF> 284066  work/emacs/.git
MEF> ------
---
Makoto Fujiwara, 
Chiba, Japan, Narita Airport and Disneyland prefecture.

Index: mk/git-package.mk
===================================================================
RCS file: /cvsroot/pkgsrc-wip/wip/mk/git-package.mk,v
retrieving revision 1.2
diff -u -r1.2 git-package.mk
--- mk/git-package.mk	3 Mar 2010 05:06:26 -0000	1.2
+++ mk/git-package.mk	8 Jun 2010 12:19:56 -0000
@@ -24,11 +24,15 @@
 
 BUILD_DEPENDS+=		scmgit-base>=1.6.4:../../devel/scmgit-base
 
+# switch either (from scratch) clone is necessary or (already cloned) checkout is enough
+_GIT_NEED_CLONE=	${WRKDIR}/.need_clone
+
 #
 # defaults for user-visible input variables
 #
 
 GIT_TAG?=		tip
+GIT_MODULE?=		${PKGBASE}
 
 DISTFILES?=		# empty
 .if empty(GIT_TAG) || ${GIT_TAG} == "tip"
@@ -37,6 +41,10 @@
 PKGREVISION?=		${GIT_TAG}
 .endif
 
+#
+# Input validation
+#
+
 .if !defined(GIT_REPOSITORIES)
 PKG_FAIL_REASON+=	"[git-package.mk] GIT_REPOSITORIES must be set."
 GIT_REPOSITORIES?=	# none
@@ -55,21 +63,83 @@
 
 _GIT_CMD=		git
 _GIT_ENV=		# empty
-_GIT_FLAGS=		--quiet --depth 1
+_GIT_FLAGS?=		--quiet --depth 1
 _GIT_PKGVERSION_CMD=	${DATE} -u +'%Y.%m.%d'
 _GIT_PKGVERSION=	${_GIT_PKGVERSION_CMD:sh}
+_GIT_DISTDIR=		${DISTDIR}/git-package
+
+_GIT_TODAY_CMD=         ${DATE} -u +'%Y-%m-%d'
+_GIT_TODAY=             ${_GIT_TODAY_CMD:sh}
+
+.for _repo_ in ${GIT_REPOSITORIES}
+GIT_MODULE.${_repo_}?=    ${GIT_MODULE} #${_repo_}
+
+## # determine appropriate checkout date or tag
+## .  if defined(GIT_TAG.${repo})
+## _GIT_TAG_FLAG.${repo}=  -r${GIT_TAG.${repo}}
+## _GIT_TAG.${repo}=       ${GIT_TAG.${repo}}
+## .  elif defined(GIT_TAG)
+## _GIT_TAG_FLAG.${repo}=  -r${GIT_TAG}
+## _GIT_TAG.${repo}=       ${GIT_TAG}
+## .  elif defined(CHECKOUT_DATE)
+## _GIT_TAG_FLAG.${repo}=  -D${CHECKOUT_DATE:Q}
+## _GIT_TAG.${repo}=       ${CHECKOUT_DATE:Q}
+## .  else
+## _GIT_TAG_FLAG.${repo}=  '-D${_GIT_TODAY} 00:00 +0000'
+_GIT_TAG.${_repo_}=       ${_GIT_TODAY:Q}
+## .  endif
+
+# Cache support:
+#   cache file name (compression is not really effective)
+_GIT_DISTFILE.${_repo_}=  ${PKGBASE}-${GIT_MODULE.${_repo_}}-${_GIT_TAG.${_repo_}}.tar
+
+#   command to extract cache file
+_GIT_EXTRACT_CACHED.${_repo_}=    \
+        if [ -f ${_GIT_DISTDIR}/${_GIT_DISTFILE.${_repo_}:Q} ]; then              \
+          ${STEP_MSG} "(1) Extracting cached GIT archive "${_GIT_DISTFILE.${_repo_}:Q}"."; \
+          pax -r -f ${_GIT_DISTDIR}/${_GIT_DISTFILE.${_repo_}:Q} ;     \
+        fi
+
+#   create cache archive
+_GIT_CREATE_CACHE.${_repo_}=      \
+        ${STEP_MSG} "(4) Creating cached GIT archive "${_GIT_DISTFILE.${_repo_}:Q} "on" ${_GIT_DISTDIR:Q}"."; \
+        ${MKDIR} ${_GIT_DISTDIR:Q};                                     \
+        pax -w  -f ${_GIT_DISTDIR}/${_GIT_DISTFILE.${_repo_}:Q} */.git || rm -f ${_GIT_DISTDIR}/${_GIT_DISTFILE.${_repo_}:Q}
+.endfor
 
 pre-extract: do-git-extract
 
 .PHONY: do-git-extract
 do-git-extract:
 .for _repo_ in ${GIT_REPOSITORIES}
-	${_PKG_SILENT}${_PKG_DEBUG}set -e;				\
+	${_PKG_SILENT}${_PKG_DEBUG} set -e;				\
 	cd ${WRKDIR};							\
-	${SETENV} ${_GIT_ENV}						\
+        if [ ! -d ${_GIT_DISTDIR} ]; then mkdir -p ${_GIT_DISTDIR:Q};  fi;	\
+        ${_GIT_EXTRACT_CACHED.${_repo_}};                                 \
+        p="$$(cd ${_GIT_DISTDIR} && ls -t ${PKGBASE}-${GIT_MODULE.${_repo_}}-* | head -n 1)";     \
+        if [ -n "$$p" ]; then                                           \
+		if [ "$$p" != ${_GIT_DISTFILE.${_repo_}:Q} ]; then		\
+          ${STEP_MSG} "(2) Extracting cached GIT archive \"""$$p\".";       \
+          pax -r -f ${_GIT_DISTDIR:Q}/"$$p";				\
+	  fi								\
+	else								\
+	  touch ${_GIT_NEED_CLONE};					\
+        fi;                                                             \
+	if [ -r ${_GIT_NEED_CLONE} ]; then				\
+        ${STEP_MSG} "(3a) git clone from "${GIT_MODULE.${_repo_}:Q}"." ; \
 		${_GIT_CMD} clone					\
 			${_GIT_FLAGS}		 			\
-			${GIT_REPO.${_repo_}:Q}
+			${GIT_REPO.${_repo_}:Q};			\
+	else								\
+	${STEP_MSG} "(3b) git checkout from "${GIT_MODULE.${_repo_}:Q} "." ; \
+		(cd ${GIT_MODULE};${_GIT_CMD} checkout -q -f master;)	\
+	fi;								\
+	if [ "$$p" != ${_GIT_DISTFILE.${_repo_}:Q} ] || [ -r ${_GIT_NEED_CLONE} ]; then			\
+	        ${_GIT_CREATE_CACHE.${_repo_}};				\
+	else								\
+         ${STEP_MSG} "(5) Skipping write cache, the same date or newly cloned";\
+	fi
 .endfor
 
 .endif
+#	${SETENV} ${_GIT_ENV}						\

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