[thirdparty/git.git] / git-pull.sh

#!/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-summary] [--no-commit] [-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
. git-sh-setup
set_reflog_action "pull $*"
require_work_tree
cd_to_toplevel

test -z "$(git ls-files -u)" ||
	die "You are in the middle of a conflicted merge."

strategy_args= no_summary= no_commit= squash=
while case "$#,$1" in 0) break ;; *,-*) ;; *) break ;; esac
do
	case "$1" in
	-n|--n|--no|--no-|--no-s|--no-su|--no-sum|--no-summ|\
		--no-summa|--no-summar|--no-summary)
		no_summary=-n ;;
	--summary)
		no_summary=$1
		;;
	--no-c|--no-co|--no-com|--no-comm|--no-commi|--no-commit)
		no_commit=--no-commit ;;
	--sq|--squ|--squa|--squas|--squash)
		squash=--squash ;;
	-s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
		--strateg=*|--strategy=*|\
	-s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
		case "$#,$1" in
		*,*=*)
			strategy=`expr "z$1" : 'z-[^=]*=\(.*\)'` ;;
		1,*)
			usage ;;
		*)
			strategy="$2"
			shift ;;
		esac
		strategy_args="${strategy_args}-s $strategy "
		;;
	-h|--h|--he|--hel|--help)
		usage
		;;
	-*)
		# Pass thru anything that is meant for fetch.
		break
		;;
	esac
	shift
done

orig_head=$(git-rev-parse --verify HEAD 2>/dev/null)
git-fetch --update-head-ok "$@" || exit 1

curr_head=$(git-rev-parse --verify HEAD 2>/dev/null)
if test "$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.

	echo >&2 "Warning: fetch updated the current branch head."
	echo >&2 "Warning: fast forwarding your working tree from"
	echo >&2 "Warning: commit $orig_head."
	git-update-index --refresh 2>/dev/null
	git-read-tree -u -m "$orig_head" "$curr_head" ||
		die '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 "$merge_head" in
'')
	curr_branch=$(git-symbolic-ref -q HEAD)
	case $? in
	  0) ;;
	  1) echo >&2 "You are not currently on a branch; you must explicitly"
	     echo >&2 "specify which branch you wish to merge:"
	     echo >&2 "  git pull <remote> <branch>"
	     exit 1;;
	  *) exit $?;;
	esac
	curr_branch=${curr_branch#refs/heads/}

	echo >&2 "Warning: No merge candidate found because value of config option
         \"branch.${curr_branch}.merge\" does not match any remote branch fetched."
	echo >&2 "No changes."
	exit 0
	;;
?*' '?*)
	if test -z "$orig_head"
	then
		echo >&2 "Cannot merge multiple branches into empty head"
		exit 1
	fi
	;;
esac

if test -z "$orig_head"
then
	git-update-ref -m "initial pull" HEAD $merge_head "" &&
	git-read-tree --reset -u HEAD || exit 1
	exit
fi

merge_name=$(git-fmt-merge-msg <"$GIT_DIR/FETCH_HEAD") || exit
exec git-merge $no_summary $no_commit $squash $strategy_args \
	"$merge_name" HEAD $merge_head
Commit	Line	Data
839a7a06 LT	1	#!/bin/sh
839a7a06 LT	2	#
521003ff JH	3	# Copyright (c) 2005 Junio C Hamano
	4	#
	5	# Fetch one or more remote refs and merge it/them into the current HEAD.
	6
806f36d4 FK	7	USAGE='[-n \| --no-summary] [--no-commit] [-s strategy]... [<fetch-options>] <repo> <head>...'
806f36d4 FK	8	LONG_USAGE='Fetch one or more remote refs and merge it/them into the current HEAD.'
533b7039	9	SUBDIRECTORY_OK=Yes
ae2b0f15	10	. git-sh-setup
f9474132	11	set_reflog_action "pull $*"
7eff28a9	12	require_work_tree
533b7039	13	cd_to_toplevel
b10ac50f	14
d1014a17	15	test -z "$(git ls-files -u)" \|\|
533b7039	16	die "You are in the middle of a conflicted merge."
d1014a17	17
7d0c6887	18	strategy_args= no_summary= no_commit= squash=
60fb5b2c JH	19	while case "$#,$1" in 0) break ;; ,-) ;; *) break ;; esac
	20	do
	21	case "$1" in
	22	-n\|--n\|--no\|--no-\|--no-s\|--no-su\|--no-sum\|--no-summ\|\
	23	--no-summa\|--no-summar\|--no-summary)
	24	no_summary=-n ;;
51e7ecf4 AR	25	--summary)
	26	no_summary=$1
	27	;;
123ee3ca JH	28	--no-c\|--no-co\|--no-com\|--no-comm\|--no-commi\|--no-commit)
123ee3ca JH	29	no_commit=--no-commit ;;
7d0c6887 JH	30	--sq\|--squ\|--squa\|--squas\|--squash)
7d0c6887 JH	31	squash=--squash ;;
60fb5b2c JH	32	-s=\|--s=\|--st=\|--str=\|--stra=\|--strat=\|--strate=*\|\
	33	--strateg=\|--strategy=\|\
	34	-s\|--s\|--st\|--str\|--stra\|--strat\|--strate\|--strateg\|--strategy)
	35	case "$#,$1" in
	36	,=*)
8096fae7	37	strategy=`expr "z$1" : 'z-[^=]=\(.\)'` ;;
60fb5b2c JH	38	1,*)
	39	usage ;;
	40	*)
	41	strategy="$2"
	42	shift ;;
	43	esac
	44	strategy_args="${strategy_args}-s $strategy "
	45	;;
93d69d86 JL	46	-h\|--h\|--he\|--hel\|--help)
	47	usage
	48	;;
60fb5b2c	49	-*)
619e5a0e JH	50	# Pass thru anything that is meant for fetch.
619e5a0e JH	51	break
60fb5b2c JH	52	;;
	53	esac
	54	shift
	55	done
	56
d09e79cb	57	orig_head=$(git-rev-parse --verify HEAD 2>/dev/null)
f9474132	58	git-fetch --update-head-ok "$@" \|\| exit 1
b10ac50f	59
d09e79cb	60	curr_head=$(git-rev-parse --verify HEAD 2>/dev/null)
b10ac50f JH	61	if test "$curr_head" != "$orig_head"
	62	then
	63	# The fetch involved updating the current branch.
	64
	65	# The working tree and the index file is still based on the
	66	# $orig_head commit, but we are merging into $curr_head.
	67	# First update the working tree to match $curr_head.
	68
	69	echo >&2 "Warning: fetch updated the current branch head."
cf46e7b8	70	echo >&2 "Warning: fast forwarding your working tree from"
a057f806	71	echo >&2 "Warning: commit $orig_head."
cf46e7b8	72	git-update-index --refresh 2>/dev/null
b10ac50f	73	git-read-tree -u -m "$orig_head" "$curr_head" \|\|
8323124a JH	74	die 'Cannot fast-forward your working tree.
	75	After making sure that you saved anything precious from
	76	$ git diff '$orig_head'
	77	output, run
	78	$ git reset --hard
	79	to recover.'
	80
b10ac50f JH	81	fi
b10ac50f JH	82
05dd8e2e JH	83	merge_head=$(sed -e '/ not-for-merge /d' \
	84	-e 's/ .*//' "$GIT_DIR"/FETCH_HEAD \| \
	85	tr '\012' ' ')
e0bfc81e JH	86
e0bfc81e JH	87	case "$merge_head" in
521003ff	88	'')
a74b1706 JK	89	curr_branch=$(git-symbolic-ref -q HEAD)
	90	case $? in
	91	0) ;;
	92	1) echo >&2 "You are not currently on a branch; you must explicitly"
	93	echo >&2 "specify which branch you wish to merge:"
	94	echo >&2 " git pull <remote> <branch>"
	95	exit 1;;
	96	*) exit $?;;
	97	esac
	98	curr_branch=${curr_branch#refs/heads/}
	99
4363dfbe JW	100	echo >&2 "Warning: No merge candidate found because value of config option
4363dfbe JW	101	\"branch.${curr_branch}.merge\" does not match any remote branch fetched."
521003ff JH	102	echo >&2 "No changes."
	103	exit 0
	104	;;
60fb5b2c	105	?' '?)
d09e79cb LT	106	if test -z "$orig_head"
	107	then
	108	echo >&2 "Cannot merge multiple branches into empty head"
	109	exit 1
	110	fi
60fb5b2c JH	111	;;
	112	esac
	113
d09e79cb LT	114	if test -z "$orig_head"
	115	then
	116	git-update-ref -m "initial pull" HEAD $merge_head "" &&
	117	git-read-tree --reset -u HEAD \|\| exit 1
	118	exit
	119	fi
	120
86378b32	121	merge_name=$(git-fmt-merge-msg <"$GIT_DIR/FETCH_HEAD") \|\| exit
bf699582	122	exec git-merge $no_summary $no_commit $squash $strategy_args \
7d0c6887	123	"$merge_name" HEAD $merge_head