diff options
| -rwxr-xr-x | git-rebase.sh | 89 |
1 files changed, 71 insertions, 18 deletions
diff --git a/git-rebase.sh b/git-rebase.sh index 16d4359830..a2651be1fe 100755 --- a/git-rebase.sh +++ b/git-rebase.sh @@ -3,10 +3,48 @@ # Copyright (c) 2005 Junio C Hamano. # -USAGE='<upstream> [<head>]' +USAGE='[--onto <newbase>] <upstream> [<branch>]' +LONG_USAGE='If <branch> is specified, switch to that branch first. Then, +extract commits in the current branch that are not in <upstream>, +and reconstruct the current on top of <upstream>, discarding the original +development history. If --onto <newbase> is specified, the history is +reconstructed on top of <newbase>, instead of <upstream>. For example, +while on "topic" branch: + + A---B---C topic + / + D---E---F---G master + + $ '"$0"' --onto master~1 master topic + +would rewrite the history to look like this: + + + A'\''--B'\''--C'\'' topic + / + D---E---F---G master +' + . git-sh-setup -case $# in 1|2) ;; *) usage ;; esac +unset newbase +while case "$#" in 0) break ;; esac +do + case "$1" in + --onto) + test 2 -le "$#" || usage + newbase="$2" + shift + ;; + -*) + usage + ;; + *) + break + ;; + esac + shift +done # Make sure we do not have .dotest if mkdir .dotest @@ -30,37 +68,52 @@ case "$diff" in ;; esac -# The other head is given. Make sure it is valid. -other=$(git-rev-parse --verify "$1^0") || usage - -# Make sure the branch to rebase is valid. -head=$(git-rev-parse --verify "${2-HEAD}^0") || exit +# The upstream head must be given. Make sure it is valid. +upstream_name="$1" +upstream=`git rev-parse --verify "${upstream_name}^0"` || + die "invalid upsteram $upstream_name" # If the branch to rebase is given, first switch to it. case "$#" in 2) + branch_name="$2" git-checkout "$2" || usage + ;; +*) + branch_name=`git symbolic-ref HEAD` || die "No current branch" + branch_name=`expr "$branch_name" : 'refs/heads/\(.*\)'` + ;; esac +branch=$(git-rev-parse --verify "${branch_name}^0") || exit -mb=$(git-merge-base "$other" "$head") +# Make sure the branch to rebase onto is valid. +onto_name=${newbase-"$upstream_name"} +onto=$(git-rev-parse --verify "${onto_name}^0") || exit -# Check if we are already based on $other. -if test "$mb" = "$other" +# Now we are rebasing commits $upstream..$branch on top of $onto + +# Check if we are already based on $onto, but this should be +# done only when upstream and onto are the same. +if test "$upstream" = "onto" then - echo >&2 "Current branch `git-symbolic-ref HEAD` is up to date." - exit 0 + mb=$(git-merge-base "$onto" "$branch") + if test "$mb" = "$onto" + then + echo >&2 "Current branch $branch_name is up to date." + exit 0 + fi fi -# Rewind the head to "$other" -git-reset --hard "$other" +# Rewind the head to "$onto"; this saves our current head in ORIG_HEAD. +git-reset --hard "$onto" -# If the $other is a proper descendant of the tip of the branch, then +# If the $onto is a proper descendant of the tip of the branch, then # we just fast forwarded. -if test "$mb" = "$head" +if test "$mb" = "$onto" then - echo >&2 "Fast-forwarded $head to $other." + echo >&2 "Fast-forwarded $branch to $newbase." exit 0 fi -git-format-patch -k --stdout --full-index "$other" ORIG_HEAD | +git-format-patch -k --stdout --full-index "$upstream" ORIG_HEAD | git am --binary -3 -k |