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#!/bin/sh
# git-rebase-subtree - rebase "subtree of branches" in one go
# Copyright (C) 2007 Hans Ulrich Niedermann
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
unset CDPATH
SED="${SED-sed}"
self=`basename "$0"`
selfdir=`dirname "$0"`
selfdir=`cd "$selfdir" && pwd`
. "$selfdir/git-ndim-sh"
SUBDIRECTORY_OK="yes"
USAGE="<command> [params...]"
LONG_USAGE="\
Let a local subtree of branches follow a remote origin without too much merging.
For more details, see the ${self}(1) man page."
. git-sh-setup
require_work_tree
# Abort on error
set -e
cmd() {
echo "CMD>" "$@"
"$@"
}
gf_init() {
configvar="rebase-subtree.subtree"
echo "$self: Examining configuration"
test -n "$(git config "$configvar")" || die "Unset or empty git config var \"$configvar\""
git config "$configvar" | while read from to restofline; do
if test "x#" = "x$(echo "$from" | sed -n '1s/^\(.\).*/\1/p')"; then continue; fi
echo ""
echo " From: $from"
echo " To: $to"
done
}
gf_branch() {
branch="$1"
newbranch="follow-old/$branch"
if git-rev-parse --verify "$branch" > /dev/null 2>&1; then
# valid branch
if git-rev-parse --verify "$newbranch" > /dev/null 2>&1; then
: # branch already exists, do nothing
else
cmd git-branch "${newbranch}" "${branch}"
fi
else
echo "$self: gf_branch called with invalid branch \"$branch\"" >&2
exit 1
fi
}
gf_rmbranch() {
branch="$1"
newbranch="follow-old/$branch"
if git-rev-parse --verify "$branch" > /dev/null 2>&1; then
if git-rev-parse --verify "$newbranch" > /dev/null 2>&1; then
cmd git-branch -D "${newbranch}"
fi
fi
}
gf_rebase_tree() {
reverse="no"
case "$1" in
--reverse) reverse=yes; shift ;;
esac
newroot="$1"
test "x$newroot" = "x" && die "Need <newroot> parameter"
oldroot="$2"
test "x$oldroot" = "x" && die "Need <oldroot> parameter"
echo
echo "$self: Preparing subtree rebase"
git config "$configvar" | while read from to restofline; do
if test "x#" = "x$(echo "$from" | sed -n '1s/^\(.\).*/\1/p')"; then continue; fi
gf_branch "$from"
gf_branch "$to"
done
echo
echo "$self: Executing subtree rebase"
git config "$configvar" | while read from to restofline; do
if test "x#" = "x$(echo "$from" | sed -n '1s/^\(.\).*/\1/p')"; then continue; fi
if test "x$reverse" = "xno" && test "x$from" = "x$oldroot"; then
cmd git-rebase --onto "$newroot" "follow-old/$from" "$to"
elif test "x$reverse" = "xyes" && test "x$from" = "x$newroot"; then
cmd git-rebase --onto "$newroot" "$oldroot" "$to"
else
cmd git-rebase --onto "$from" "follow-old/$from" "$to"
fi
done
echo
echo "$self: Cleaning up after subtree rebase"
git config "$configvar" | while read from to restofline; do
if test "x#" = "x$(echo "$from" | sed -n '1s/^\(.\).*/\1/p')"; then continue; fi
gf_rmbranch "$from"
gf_rmbranch "$to"
done
}
gf_init
gf_rebase_tree "$@"
# End of file.
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