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061219fa7c
* en/rebase-against-rebase-fix: pull --rebase: Avoid spurious conflicts and reapplying unnecessary patches t5520-pull: Add testcases showing spurious conflicts from git pull --rebase
297 lines
8.1 KiB
Bash
Executable file
297 lines
8.1 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-stat] [--[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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die_conflict () {
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git diff-index --cached --name-status -r --ignore-submodules HEAD --
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if [ $(git config --bool --get advice.resolveConflict || echo true) = "true" ]; then
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die "Pull is not possible because you have unmerged files.
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Please, fix them up in the work tree, and then use 'git add/rm <file>'
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as appropriate to mark resolution, or use 'git commit -a'."
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else
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die "Pull is not possible because you have unmerged files."
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fi
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}
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die_merge () {
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if [ $(git config --bool --get advice.resolveConflict || echo true) = "true" ]; then
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die "You have not concluded your merge (MERGE_HEAD exists).
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Please, commit your changes before you can merge."
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else
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die "You have not concluded your merge (MERGE_HEAD exists)."
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fi
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}
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test -z "$(git ls-files -u)" || die_conflict
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test -f "$GIT_DIR/MERGE_HEAD" && die_merge
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strategy_args= diffstat= no_commit= squash= no_ff= ff_only=
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log_arg= verbosity= progress=
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merge_args=
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curr_branch=$(git symbolic-ref -q HEAD)
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curr_branch_short="${curr_branch#refs/heads/}"
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rebase=$(git config --bool branch.$curr_branch_short.rebase)
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dry_run=
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while :
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do
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case "$1" in
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-q|--quiet)
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verbosity="$verbosity -q" ;;
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-v|--verbose)
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verbosity="$verbosity -v" ;;
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--progress)
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progress=--progress ;;
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-n|--no-stat|--no-summary)
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diffstat=--no-stat ;;
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--stat|--summary)
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diffstat=--stat ;;
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--log|--no-log)
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log_arg=$1 ;;
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--no-c|--no-co|--no-com|--no-comm|--no-commi|--no-commit)
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no_commit=--no-commit ;;
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--c|--co|--com|--comm|--commi|--commit)
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no_commit=--commit ;;
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--sq|--squ|--squa|--squas|--squash)
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squash=--squash ;;
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--no-sq|--no-squ|--no-squa|--no-squas|--no-squash)
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squash=--no-squash ;;
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--ff)
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no_ff=--ff ;;
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--no-ff)
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no_ff=--no-ff ;;
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--ff-only)
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ff_only=--ff-only ;;
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-s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
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--strateg=*|--strategy=*|\
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-s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
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case "$#,$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 $strategy "
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;;
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-X*)
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case "$#,$1" in
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1,-X)
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usage ;;
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*,-X)
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xx="-X $(git rev-parse --sq-quote "$2")"
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shift ;;
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*,*)
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xx=$(git rev-parse --sq-quote "$1") ;;
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esac
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merge_args="$merge_args$xx "
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;;
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-r|--r|--re|--reb|--reba|--rebas|--rebase)
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rebase=true
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;;
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--no-r|--no-re|--no-reb|--no-reba|--no-rebas|--no-rebase)
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rebase=false
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;;
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--d|--dr|--dry|--dry-|--dry-r|--dry-ru|--dry-run)
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dry_run=--dry-run
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;;
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-h|--h|--he|--hel|--help)
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usage
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;;
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*)
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# Pass thru anything that may be meant for fetch.
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break
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;;
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esac
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shift
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done
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error_on_no_merge_candidates () {
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exec >&2
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for opt
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do
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case "$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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if test true = "$rebase"
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then
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op_type=rebase
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op_prep=against
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else
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op_type=merge
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op_prep=with
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fi
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curr_branch=${curr_branch#refs/heads/}
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upstream=$(git config "branch.$curr_branch.merge")
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remote=$(git config "branch.$curr_branch.remote")
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if [ $# -gt 1 ]; then
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if [ "$rebase" = true ]; then
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printf "There is no candidate for rebasing against "
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else
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printf "There are no candidates for merging "
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fi
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echo "among the refs that you just fetched."
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echo "Generally this means that you provided a wildcard refspec which had no"
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echo "matches on the remote end."
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elif [ $# -gt 0 ] && [ "$1" != "$remote" ]; then
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echo "You asked to pull from the remote '$1', but did not specify"
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echo "a branch. Because this is not the default configured remote"
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echo "for your current branch, you must specify a branch on the command line."
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elif [ -z "$curr_branch" ]; then
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echo "You are not currently on a branch, so I cannot use any"
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echo "'branch.<branchname>.merge' in your configuration file."
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echo "Please specify which remote branch you want to use on the command"
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echo "line and try again (e.g. 'git pull <repository> <refspec>')."
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echo "See git-pull(1) for details."
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elif [ -z "$upstream" ]; then
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echo "You asked me to pull without telling me which branch you"
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echo "want to $op_type $op_prep, and 'branch.${curr_branch}.merge' in"
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echo "your configuration file does not tell me, either. Please"
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echo "specify which branch you want to use 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."
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echo
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echo "If you often $op_type $op_prep the same branch, you may want to"
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echo "use something like the following in your configuration file:"
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echo
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echo " [branch \"${curr_branch}\"]"
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echo " remote = <nickname>"
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echo " merge = <remote-ref>"
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test rebase = "$op_type" &&
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echo " rebase = true"
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echo
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echo " [remote \"<nickname>\"]"
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echo " url = <url>"
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echo " fetch = <refspec>"
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echo
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echo "See git-config(1) for details."
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else
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echo "Your configuration specifies to $op_type $op_prep the ref '${upstream#refs/heads/}'"
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echo "from the remote, but no such ref was fetched."
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fi
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exit 1
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}
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test true = "$rebase" && {
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if ! git rev-parse -q --verify HEAD >/dev/null
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then
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# On an unborn branch
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if test -f "$GIT_DIR/index"
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then
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die "updating an unborn branch with changes added to the index"
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fi
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else
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git update-index --ignore-submodules --refresh &&
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git diff-files --ignore-submodules --quiet &&
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git diff-index --ignore-submodules --cached --quiet HEAD -- ||
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die "refusing to pull with rebase: your working tree is not up-to-date"
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fi
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oldremoteref= &&
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. git-parse-remote &&
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remoteref="$(get_remote_merge_branch "$@" 2>/dev/null)" &&
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oldremoteref="$(git rev-parse -q --verify "$remoteref")" &&
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for reflog in $(git rev-list -g $remoteref 2>/dev/null)
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do
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if test "$reflog" = "$(git merge-base $reflog $curr_branch)"
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then
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oldremoteref="$reflog"
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break
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fi
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done
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}
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orig_head=$(git rev-parse -q --verify HEAD)
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git fetch $verbosity $progress $dry_run --update-head-ok "$@" || exit 1
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test -z "$dry_run" || exit 0
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curr_head=$(git rev-parse -q --verify HEAD)
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if test -n "$orig_head" && test "$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 $orig_head."
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git update-index -q --refresh
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git read-tree -u -m "$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 "$merge_head" in
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'')
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error_on_no_merge_candidates "$@"
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;;
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?*' '?*)
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if test -z "$orig_head"
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then
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die "Cannot merge multiple branches into empty head"
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fi
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if test true = "$rebase"
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then
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die "Cannot rebase onto multiple branches"
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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 $merge_head "$curr_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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if test true = "$rebase"
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then
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o=$(git show-branch --merge-base $curr_branch $merge_head $oldremoteref)
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if test "$oldremoteref" = "$o"
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then
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unset oldremoteref
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fi
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fi
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merge_name=$(git fmt-merge-msg $log_arg <"$GIT_DIR/FETCH_HEAD") || exit
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case "$rebase" in
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true)
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eval="git-rebase $diffstat $strategy_args $merge_args"
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eval="$eval --onto $merge_head ${oldremoteref:-$merge_head}"
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;;
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*)
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eval="git-merge $diffstat $no_commit $squash $no_ff $ff_only"
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eval="$eval $log_arg $strategy_args $merge_args"
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eval="$eval \"\$merge_name\" HEAD $merge_head $verbosity"
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;;
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esac
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eval "exec $eval"
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