e646c9c8c0
This allows you to rewrite history a bit more flexibly, by
separating the other branch name and new branch point. By
default, the new branch point is the same as the tip of the
other branch as before, but you can specify where you graft the
rebased branch onto.
When you have this ancestry graph:
A---B---C topic
/
D---E---F---G master
$ git rebase --onto master~1 master topic
would rewrite the history to look like this:
A'\''--B'\''--C'\'' topic
/
D---E---F---G master
Signed-off-by: Junio C Hamano <junkio@cox.net>
120 lines
2.7 KiB
Bash
Executable File
120 lines
2.7 KiB
Bash
Executable File
#!/bin/sh
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#
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# Copyright (c) 2005 Junio C Hamano.
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#
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USAGE='[--onto <newbase>] <upstream> [<branch>]'
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LONG_USAGE='If <branch> is specified, switch to that branch first. Then,
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extract commits in the current branch that are not in <upstream>,
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and reconstruct the current on top of <upstream>, discarding the original
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development history. If --onto <newbase> is specified, the history is
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reconstructed on top of <newbase>, instead of <upstream>. For example,
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while on "topic" branch:
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A---B---C topic
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/
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D---E---F---G master
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$ '"$0"' --onto master~1 master topic
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would rewrite the history to look like this:
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A'\''--B'\''--C'\'' topic
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/
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D---E---F---G master
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'
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. git-sh-setup
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unset newbase
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while case "$#" in 0) break ;; esac
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do
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case "$1" in
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--onto)
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test 2 -le "$#" || usage
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newbase="$2"
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shift
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;;
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-*)
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usage
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;;
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*)
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break
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;;
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esac
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shift
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done
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# Make sure we do not have .dotest
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if mkdir .dotest
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then
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rmdir .dotest
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else
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echo >&2 '
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It seems that I cannot create a .dotest directory, and I wonder if you
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are in the middle of patch application or another rebase. If that is not
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the case, please rm -fr .dotest and run me again. I am stopping in case
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you still have something valuable there.'
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exit 1
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fi
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# The tree must be really really clean.
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git-update-index --refresh || exit
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diff=$(git-diff-index --cached --name-status -r HEAD)
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case "$diff" in
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?*) echo "$diff"
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exit 1
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;;
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esac
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# The upstream head must be given. Make sure it is valid.
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upstream_name="$1"
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upstream=`git rev-parse --verify "${upstream_name}^0"` ||
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die "invalid upsteram $upstream_name"
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# If the branch to rebase is given, first switch to it.
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case "$#" in
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2)
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branch_name="$2"
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git-checkout "$2" || usage
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;;
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*)
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branch_name=`git symbolic-ref HEAD` || die "No current branch"
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branch_name=`expr "$branch_name" : 'refs/heads/\(.*\)'`
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;;
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esac
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branch=$(git-rev-parse --verify "${branch_name}^0") || exit
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# Make sure the branch to rebase onto is valid.
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onto_name=${newbase-"$upstream_name"}
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onto=$(git-rev-parse --verify "${onto_name}^0") || exit
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# Now we are rebasing commits $upstream..$branch on top of $onto
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# Check if we are already based on $onto, but this should be
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# done only when upstream and onto are the same.
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if test "$upstream" = "onto"
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then
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mb=$(git-merge-base "$onto" "$branch")
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if test "$mb" = "$onto"
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then
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echo >&2 "Current branch $branch_name is up to date."
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exit 0
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fi
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fi
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# Rewind the head to "$onto"; this saves our current head in ORIG_HEAD.
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git-reset --hard "$onto"
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# If the $onto is a proper descendant of the tip of the branch, then
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# we just fast forwarded.
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if test "$mb" = "$onto"
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then
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echo >&2 "Fast-forwarded $branch to $newbase."
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exit 0
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fi
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git-format-patch -k --stdout --full-index "$upstream" ORIG_HEAD |
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git am --binary -3 -k
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