Improve getrevision.sh

- remove bashism.
 - simplify some git-related code.
 - improved parameter and error handling.
 - additional -d/--date action which is similar to the timestamp action.
 - support for an optional path parameter.
 - there is only one sane time format.
 - and only one sane date format too.
 - use UTC dates and times only.
 - vastly improve git_url() to print the correct remote url and
   "nearest" branch.
 - remove username from repository URLs.
 - add "-dirty" to local revisions if there are uncommitted changes.
 - indicate in local revisions how many git-only commits were done
   since branching from upstream svn.
 - fix svn_revision() fallback to svn info and remove git-svn.
 - print leading r in script instead of hardcode it in the makefile;
   no more "0.9.7-runknown".
 - make retrieving the upstream revision work even in cloned git-svn
   repositories.
 - more abstractions and helper functions.
 - less fragmentation of actual functionality.

Corresponding to flashrom svn r1727.

Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>

Makefile

@@ -333,14 +333,13 @@ LIB_OBJS = layout.o flashrom.o udelay.o programmer.o
 
 CLI_OBJS = cli_classic.o cli_output.o print.o
 
-# Set the flashrom version string from the highest revision number
-# of the checked out flashrom files.
+# Set the flashrom version string from the highest revision number of the checked out flashrom files.
 # Note to packagers: Any tree exported with "make export" or "make tarball"
 # will not require subversion. The downloadable snapshots are already exported.
 SVNVERSION := $(shell ./util/getrevision.sh -u)
 
 RELEASE := 0.9.7
-VERSION := $(RELEASE)-r$(SVNVERSION)
+VERSION := $(RELEASE)-$(SVNVERSION)
 RELEASENAME ?= $(VERSION)
 
 SVNDEF := -D'FLASHROM_VERSION="$(VERSION)"'