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executable file 287 lines (266 sloc) 7.581 kb
#!/bin/sh
#
# Copyright (c) 2005 Junio C Hamano
#
# Fetch one or more remote refs and merge it/them into the current HEAD.
USAGE='[-n | --no-stat] [--[no-]commit] [--[no-]squash] [--[no-]ff] [-s strategy]... [<fetch-options>] <repo> <head>...'
LONG_USAGE='Fetch one or more remote refs and merge it/them into the current HEAD.'
SUBDIRECTORY_OK=Yes
OPTIONS_SPEC=
. git-sh-setup
. git-sh-i18n
set_reflog_action "pull${1+ $*}"
require_work_tree_exists
cd_to_toplevel
die_conflict () {
git diff-index --cached --name-status -r --ignore-submodules HEAD --
if [ $(git config --bool --get advice.resolveConflict || echo true) = "true" ]; then
die "$(gettext "Pull is not possible because you have unmerged files.
Please, fix them up in the work tree, and then use 'git add/rm <file>'
as appropriate to mark resolution, or use 'git commit -a'.")"
else
die "$(gettext "Pull is not possible because you have unmerged files.")"
fi
}
die_merge () {
if [ $(git config --bool --get advice.resolveConflict || echo true) = "true" ]; then
die "$(gettext "You have not concluded your merge (MERGE_HEAD exists).
Please, commit your changes before you can merge.")"
else
die "$(gettext "You have not concluded your merge (MERGE_HEAD exists).")"
fi
}
test -z "$(git ls-files -u)" || die_conflict
test -f "$GIT_DIR/MERGE_HEAD" && die_merge
strategy_args= diffstat= no_commit= squash= no_ff= ff_only=
log_arg= verbosity= progress= recurse_submodules=
merge_args=
curr_branch=$(git symbolic-ref -q HEAD)
curr_branch_short="${curr_branch#refs/heads/}"
rebase=$(git config --bool branch.$curr_branch_short.rebase)
if test -z "$rebase"
then
rebase=$(git config --bool pull.rebase)
fi
dry_run=
while :
do
case "$1" in
-q|--quiet)
verbosity="$verbosity -q" ;;
-v|--verbose)
verbosity="$verbosity -v" ;;
--progress)
progress=--progress ;;
--no-progress)
progress=--no-progress ;;
-n|--no-stat|--no-summary)
diffstat=--no-stat ;;
--stat|--summary)
diffstat=--stat ;;
--log|--no-log)
log_arg=$1 ;;
--no-c|--no-co|--no-com|--no-comm|--no-commi|--no-commit)
no_commit=--no-commit ;;
--c|--co|--com|--comm|--commi|--commit)
no_commit=--commit ;;
--sq|--squ|--squa|--squas|--squash)
squash=--squash ;;
--no-sq|--no-squ|--no-squa|--no-squas|--no-squash)
squash=--no-squash ;;
--ff)
no_ff=--ff ;;
--no-ff)
no_ff=--no-ff ;;
--ff-only)
ff_only=--ff-only ;;
-s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
--strateg=*|--strategy=*|\
-s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
case "$#,$1" in
*,*=*)
strategy=`expr "z$1" : 'z-[^=]*=\(.*\)'` ;;
1,*)
usage ;;
*)
strategy="$2"
shift ;;
esac
strategy_args="${strategy_args}-s $strategy "
;;
-X*)
case "$#,$1" in
1,-X)
usage ;;
*,-X)
xx="-X $(git rev-parse --sq-quote "$2")"
shift ;;
*,*)
xx=$(git rev-parse --sq-quote "$1") ;;
esac
merge_args="$merge_args$xx "
;;
-r|--r|--re|--reb|--reba|--rebas|--rebase)
rebase=true
;;
--no-r|--no-re|--no-reb|--no-reba|--no-rebas|--no-rebase)
rebase=false
;;
--recurse-submodules)
recurse_submodules=--recurse-submodules
;;
--recurse-submodules=*)
recurse_submodules="$1"
;;
--no-recurse-submodules)
recurse_submodules=--no-recurse-submodules
;;
--d|--dr|--dry|--dry-|--dry-r|--dry-ru|--dry-run)
dry_run=--dry-run
;;
-h|--help-all)
usage
;;
*)
# Pass thru anything that may be meant for fetch.
break
;;
esac
shift
done
error_on_no_merge_candidates () {
exec >&2
for opt
do
case "$opt" in
-t|--t|--ta|--tag|--tags)
echo "Fetching tags only, you probably meant:"
echo " git fetch --tags"
exit 1
esac
done
if test true = "$rebase"
then
op_type=rebase
op_prep=against
else
op_type=merge
op_prep=with
fi
curr_branch=${curr_branch#refs/heads/}
upstream=$(git config "branch.$curr_branch.merge")
remote=$(git config "branch.$curr_branch.remote")
if [ $# -gt 1 ]; then
if [ "$rebase" = true ]; then
printf "There is no candidate for rebasing against "
else
printf "There are no candidates for merging "
fi
echo "among the refs that you just fetched."
echo "Generally this means that you provided a wildcard refspec which had no"
echo "matches on the remote end."
elif [ $# -gt 0 ] && [ "$1" != "$remote" ]; then
echo "You asked to pull from the remote '$1', but did not specify"
echo "a branch. Because this is not the default configured remote"
echo "for your current branch, you must specify a branch on the command line."
elif [ -z "$curr_branch" -o -z "$upstream" ]; then
. git-parse-remote
error_on_missing_default_upstream "pull" $op_type $op_prep \
"git pull <repository> <refspec>"
else
echo "Your configuration specifies to $op_type $op_prep the ref '${upstream#refs/heads/}'"
echo "from the remote, but no such ref was fetched."
fi
exit 1
}
test true = "$rebase" && {
if ! git rev-parse -q --verify HEAD >/dev/null
then
# On an unborn branch
if test -f "$GIT_DIR/index"
then
die "$(gettext "updating an unborn branch with changes added to the index")"
fi
else
require_clean_work_tree "pull with rebase" "Please commit or stash them."
fi
oldremoteref= &&
. git-parse-remote &&
remoteref="$(get_remote_merge_branch "$@" 2>/dev/null)" &&
oldremoteref="$(git rev-parse -q --verify "$remoteref")" &&
for reflog in $(git rev-list -g $remoteref 2>/dev/null)
do
if test "$reflog" = "$(git merge-base $reflog $curr_branch)"
then
oldremoteref="$reflog"
break
fi
done
}
orig_head=$(git rev-parse -q --verify HEAD)
git fetch $verbosity $progress $dry_run $recurse_submodules --update-head-ok "$@" || exit 1
test -z "$dry_run" || exit 0
curr_head=$(git rev-parse -q --verify HEAD)
if test -n "$orig_head" && test "$curr_head" != "$orig_head"
then
# The fetch involved updating the current branch.
# The working tree and the index file is still based on the
# $orig_head commit, but we are merging into $curr_head.
# First update the working tree to match $curr_head.
eval_gettextln "Warning: fetch updated the current branch head.
Warning: fast-forwarding your working tree from
Warning: commit \$orig_head." >&2
git update-index -q --refresh
git read-tree -u -m "$orig_head" "$curr_head" ||
die "$(eval_gettext "Cannot fast-forward your working tree.
After making sure that you saved anything precious from
$ git diff \$orig_head
output, run
$ git reset --hard
to recover.")"
fi
merge_head=$(sed -e '/ not-for-merge /d' \
-e 's/ .*//' "$GIT_DIR"/FETCH_HEAD | \
tr '\012' ' ')
case "$merge_head" in
'')
error_on_no_merge_candidates "$@"
;;
?*' '?*)
if test -z "$orig_head"
then
die "$(gettext "Cannot merge multiple branches into empty head")"
fi
if test true = "$rebase"
then
die "$(gettext "Cannot rebase onto multiple branches")"
fi
;;
esac
if test -z "$orig_head"
then
git update-ref -m "initial pull" HEAD $merge_head "$curr_head" &&
git read-tree -m -u HEAD || exit 1
exit
fi
if test true = "$rebase"
then
o=$(git show-branch --merge-base $curr_branch $merge_head $oldremoteref)
if test "$oldremoteref" = "$o"
then
unset oldremoteref
fi
fi
merge_name=$(git fmt-merge-msg $log_arg <"$GIT_DIR/FETCH_HEAD") || exit
case "$rebase" in
true)
eval="git-rebase $diffstat $strategy_args $merge_args"
eval="$eval --onto $merge_head ${oldremoteref:-$merge_head}"
;;
*)
eval="git-merge $diffstat $no_commit $squash $no_ff $ff_only"
eval="$eval $log_arg $strategy_args $merge_args $verbosity $progress"
eval="$eval \"\$merge_name\" HEAD $merge_head"
;;
esac
eval "exec $eval"
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