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c85c79279d
When the upstream branch is tracked, we can detect if that branch was rebased since it was last fetched. Teach git to use that information to rebase from the old remote head onto the new remote head. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
179 lines
4.8 KiB
Bash
Executable file
179 lines
4.8 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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# Fetch one or more remote refs and merge it/them into the current HEAD.
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USAGE='[-n | --no-summary] [--[no-]commit] [--[no-]squash] [--[no-]ff] [-s strategy]... [<fetch-options>] <repo> <head>...'
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LONG_USAGE='Fetch one or more remote refs and merge it/them into the current HEAD.'
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SUBDIRECTORY_OK=Yes
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OPTIONS_SPEC=
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. git-sh-setup
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set_reflog_action "pull $*"
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require_work_tree
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cd_to_toplevel
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test -z "$(git ls-files -u)" ||
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die "You are in the middle of a conflicted merge."
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strategy_args= no_summary= no_commit= squash= no_ff=
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curr_branch=$(git symbolic-ref -q HEAD)
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curr_branch_short=$(echo "$curr_branch" | sed "s|refs/heads/||")
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rebase=$(git config --bool branch.$curr_branch_short.rebase)
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while :
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do
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case "$1" in
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-n|--n|--no|--no-|--no-s|--no-su|--no-sum|--no-summ|\
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--no-summa|--no-summar|--no-summary)
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no_summary=-n ;;
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--summary)
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no_summary=$1
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;;
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--no-c|--no-co|--no-com|--no-comm|--no-commi|--no-commit)
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no_commit=--no-commit ;;
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--c|--co|--com|--comm|--commi|--commit)
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no_commit=--commit ;;
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--sq|--squ|--squa|--squas|--squash)
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squash=--squash ;;
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--no-sq|--no-squ|--no-squa|--no-squas|--no-squash)
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squash=--no-squash ;;
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--ff)
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no_ff=--ff ;;
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--no-ff)
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no_ff=--no-ff ;;
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-s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
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--strateg=*|--strategy=*|\
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-s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
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case "$#,$1" in
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*,*=*)
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strategy=`expr "z$1" : 'z-[^=]*=\(.*\)'` ;;
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1,*)
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usage ;;
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*)
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strategy="$2"
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shift ;;
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esac
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strategy_args="${strategy_args}-s $strategy "
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;;
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-r|--r|--re|--reb|--reba|--rebas|--rebase)
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rebase=true
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;;
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--no-r|--no-re|--no-reb|--no-reba|--no-rebas|--no-rebase)
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rebase=false
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;;
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-h|--h|--he|--hel|--help)
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usage
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;;
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*)
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# Pass thru anything that may be meant for fetch.
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break
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;;
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esac
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shift
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done
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error_on_no_merge_candidates () {
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exec >&2
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for opt
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do
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case "$opt" in
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-t|--t|--ta|--tag|--tags)
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echo "Fetching tags only, you probably meant:"
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echo " git fetch --tags"
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exit 1
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esac
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done
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curr_branch=${curr_branch#refs/heads/}
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echo "You asked me to pull without telling me which branch you"
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echo "want to merge with, and 'branch.${curr_branch}.merge' in"
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echo "your configuration file does not tell me either. Please"
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echo "name which branch you want to merge on the command line and"
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echo "try again (e.g. 'git pull <repository> <refspec>')."
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echo "See git-pull(1) for details on the refspec."
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echo
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echo "If you often merge with the same branch, you may want to"
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echo "configure the following variables in your configuration"
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echo "file:"
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echo
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echo " branch.${curr_branch}.remote = <nickname>"
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echo " branch.${curr_branch}.merge = <remote-ref>"
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echo " remote.<nickname>.url = <url>"
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echo " remote.<nickname>.fetch = <refspec>"
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echo
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echo "See git-config(1) for details."
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exit 1
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}
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test true = "$rebase" && {
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. git-parse-remote &&
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origin="$1"
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test -z "$origin" && origin=$(get_default_remote)
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reflist="$(get_remote_refs_for_fetch "$@" 2>/dev/null |
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sed "s|refs/heads/\(.*\):|\1|")" &&
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oldremoteref="$(git rev-parse --verify \
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"refs/remotes/$origin/$reflist" 2>/dev/null)"
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}
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orig_head=$(git rev-parse --verify HEAD 2>/dev/null)
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git-fetch --update-head-ok "$@" || exit 1
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curr_head=$(git rev-parse --verify HEAD 2>/dev/null)
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if test "$curr_head" != "$orig_head"
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then
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# The fetch involved updating the current branch.
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# The working tree and the index file is still based on the
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# $orig_head commit, but we are merging into $curr_head.
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# First update the working tree to match $curr_head.
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echo >&2 "Warning: fetch updated the current branch head."
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echo >&2 "Warning: fast forwarding your working tree from"
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echo >&2 "Warning: commit $orig_head."
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git update-index --refresh 2>/dev/null
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git read-tree -u -m "$orig_head" "$curr_head" ||
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die 'Cannot fast-forward your working tree.
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After making sure that you saved anything precious from
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$ git diff '$orig_head'
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output, run
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$ git reset --hard
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to recover.'
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fi
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merge_head=$(sed -e '/ not-for-merge /d' \
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-e 's/ .*//' "$GIT_DIR"/FETCH_HEAD | \
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tr '\012' ' ')
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case "$merge_head" in
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'')
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case $? in
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0) error_on_no_merge_candidates "$@";;
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1) echo >&2 "You are not currently on a branch; you must explicitly"
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echo >&2 "specify which branch you wish to merge:"
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echo >&2 " git pull <remote> <branch>"
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exit 1;;
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*) exit $?;;
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esac
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;;
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?*' '?*)
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if test -z "$orig_head"
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then
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echo >&2 "Cannot merge multiple branches into empty head"
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exit 1
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fi
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;;
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esac
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if test -z "$orig_head"
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then
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git update-ref -m "initial pull" HEAD $merge_head "" &&
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git read-tree --reset -u HEAD || exit 1
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exit
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fi
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merge_name=$(git fmt-merge-msg <"$GIT_DIR/FETCH_HEAD") || exit
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test true = "$rebase" &&
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exec git-rebase --onto $merge_head ${oldremoteref:-$merge_head}
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exec git-merge $no_summary $no_commit $squash $no_ff $strategy_args \
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"$merge_name" HEAD $merge_head
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