convert a git repo to svn and backwards

Makefile

# convert a git repo to svn or, an svn repo to git
# - git-core/git, subversion/svn and subgit ver 2.x.x should be installed
# - when converting from git to svn, a git-bare repo will be created
#
# HOW TO USE
# invoke make giving the appropriate target for the conversion and
# also definig the REPO variable that represents the repository name.
# do _not_ insert a leading / when specifying the repository name!
#   example #1: make REPO=/path/to/some/git/repo svn
#   example #2: make REPO=/path/to/some/svn/repo git
#

GIT_REPO := $(notdir $(REPO))-git
SVN_REPO := $(notdir $(REPO))-svn

all:
	@echo "available targets are 'svn' and 'git'"

REPO:
ifndef REPO
	@echo "error: specify the repository name by defining the REPO var when invoking make"
	@echo "NOTICE: do _not_ insert a leading / when specifying the repository name"
	@false
endif

subgit:
	@subgit --version | grep -q -F "SubGit version 2."

svn: REPO subgit
	@printf "creating svn repo '%s' using git repo '%s'\n" $(SVN_REPO) $(REPO)
	@git clone --bare $(REPO) $(GIT_REPO)
	@svnadmin create $(SVN_REPO)
	@subgit configure $(SVN_REPO)
	@printf '%s\n' "/^\[git[[:blank:]]/"         \
		"/^[[:blank:]]*repository[[:blank:]]*=/" \
		"s/=.*/= ..\/$(GIT_REPO)/"               \
		"wq" | ed -s $(SVN_REPO)/conf/subgit.conf
	@subgit install $(SVN_REPO)

git: REPO subgit
	@echo " --=-- TODO --=-- "
	@printf "creating git repo '%s' using svn repo '%s'\n" $(GIT_REPO) $(REPO)
	@subgit import $(REPO)

.PHONY: all REPO subgit svn git

dependencies:

• git
• subversion
• subgit ver. 2.x.x