git-gc-everything

#!/usr/bin/make -f
# find all git repos and run gc in them
# options:
#   DEPTH=<number> pass to find
#   DIR=<path>     where to look
#   NICE=<lvl>     nice level (-20..19)
#   IONICE=<lvl>   ionice level (0..7)
#
# Why a makefile?  so you can pass it a -j

FIND_CMD      = find ${DIR} $(if ${DEPTH},-maxdepth ${DEPTH}) -type d -name .git | sed -e 's,^\./,,'
GIT_DIRS      = $(shell ${FIND_CMD})
ACT_PREFIX    = do-gc-in-
GC_ACTIONS    = $(foreach dir,${GIT_DIRS},${ACT_PREFIX}${dir})

DIR          ?= .
DEPTH        ?=
NICE         ?= 20
IONICE       ?= 7
NICE_CMD     = $(if ${NICE},nice -n${NICE}) $(if ${IONICE},ionice -n ${IONICE})

.PHONY: all
all: ${GC_ACTIONS}

.PHONY: ${GIT_DIRS}
${GC_ACTIONS}: ${ACT_PREFIX}%: %
        ### Cleaning $<
        test -f $</HEAD && ${NICE_CMD} git --git-dir $< gc