summaryrefslogtreecommitdiff
path: root/git-fetch.sh
blob: 822b4cd982c46feaeed9b94b16973b63a0c567c1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
#!/bin/sh
#
. git-sh-setup || die "Not a git archive"
. git-parse-remote
_x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
_x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40"

append=
force=
update_head_ok=
while case "$#" in 0) break ;; esac
do
	case "$1" in
	-a|--a|--ap|--app|--appe|--appen|--append)
		append=t
		;;
	-f|--f|--fo|--for|--forc|--force)
		force=t
		;;
	-u|--u|--up|--upd|--upda|--updat|--update|--update-|--update-h|\
	--update-he|--update-hea|--update-head|--update-head-|\
	--update-head-o|--update-head-ok)
		update_head_ok=t
		;;
	*)
		break
		;;
	esac
	shift
done

case "$#" in
0)
	test -f "$GIT_DIR/branches/origin" ||
		test -f "$GIT_DIR/remotes/origin" ||
			die "Where do you want to fetch from today?"
	set origin ;;
esac

remote_nick="$1"
remote=$(get_remote_url "$@")
refs=
rref=
rsync_slurped_objects=

if test "" = "$append"
then
	: >$GIT_DIR/FETCH_HEAD
fi

append_fetch_head () {
    head_="$1"
    remote_="$2"
    remote_name_="$3"
    remote_nick_="$4"
    local_name_="$5"

    # remote-nick is the URL given on the command line (or a shorthand)
    # remote-name is the $GIT_DIR relative refs/ path we computed
    # for this refspec.
    case "$remote_name_" in
    HEAD)
	note_= ;;
    refs/heads/*)
	note_="$(expr "$remote_name_" : 'refs/heads/\(.*\)')"
	note_="branch '$note_' of " ;;
    refs/tags/*)
	note_="$(expr "$remote_name_" : 'refs/tags/\(.*\)')"
	note_="tag '$note_' of " ;;
    *)
	note_="$remote_name of " ;;
    esac
    remote_1_=$(expr "$remote_" : '\(.*\)\.git/*$') &&
	remote_="$remote_1_"
    note_="$note_$remote_"

    # 2.6.11-tree tag would not be happy to be fed to resolve.
    if git-cat-file commit "$head_" >/dev/null 2>&1
    then
	headc_=$(git-rev-parse --verify "$head_^0") || exit
	echo "$headc_	$note_" >>$GIT_DIR/FETCH_HEAD
	echo >&2 "* committish: $head_"
	echo >&2 "  $note_"
    else
	echo >&2 "* non-commit: $head_"
	echo >&2 "  $note_"
    fi
    if test "$local_name_" != ""
    then
	# We are storing the head locally.  Make sure that it is
	# a fast forward (aka "reverse push").
	fast_forward_local "$local_name_" "$head_" "$note_"
    fi
}

fast_forward_local () {
    mkdir -p "$(dirname "$GIT_DIR/$1")"
    case "$1" in
    refs/tags/*)
	# Tags need not be pointing at commits so there
	# is no way to guarantee "fast-forward" anyway.
	if test -f "$GIT_DIR/$1"
	then
		echo >&2 "* $1: updating with $3"
	else
		echo >&2 "* $1: storing $3"
	fi
	echo "$2" >"$GIT_DIR/$1" ;;

    refs/heads/*)
	# NEEDSWORK: use the same cmpxchg protocol here.
	echo "$2" >"$GIT_DIR/$1.lock"
	if test -f "$GIT_DIR/$1"
	then
	    local=$(git-rev-parse --verify "$1^0") &&
	    mb=$(git-merge-base "$local" "$2") &&
	    case "$2,$mb" in
	    $local,*)
		echo >&2 "* $1: same as $3"
		;;
	    *,$local)
		echo >&2 "* $1: fast forward to $3"
		;;
	    *)
		false
		;;
	    esac || {
		echo >&2 "* $1: does not fast forward to $3;"
		case "$force,$single_force" in
		t,* | *,t)
			echo >&2 "  forcing update."
			;;
		*)
			mv "$GIT_DIR/$1.lock" "$GIT_DIR/$1.remote"
			echo >&2 "  leaving it in '$1.remote'"
			;;
		esac
	    }
	else
		echo >&2 "* $1: storing $3"
	fi
	test -f "$GIT_DIR/$1.lock" &&
	    mv "$GIT_DIR/$1.lock" "$GIT_DIR/$1"
	;;
    esac
}

case "$update_head_ok" in
'')
	orig_head=$(cat "$GIT_DIR/HEAD" 2>/dev/null)
	;;
esac

for ref in $(get_remote_refs_for_fetch "$@")
do
    refs="$refs $ref"

    # These are relative path from $GIT_DIR, typically starting at refs/
    # but may be HEAD
    if expr "$ref" : '\+' >/dev/null
    then
	single_force=t
	ref=$(expr "$ref" : '\+\(.*\)')
    else
	single_force=
    fi
    remote_name=$(expr "$ref" : '\([^:]*\):')
    local_name=$(expr "$ref" : '[^:]*:\(.*\)')

    rref="$rref $remote_name"

    # There are transports that can fetch only one head at a time...
    case "$remote" in
    http://* | https://*)
	if [ -n "$GIT_SSL_NO_VERIFY" ]; then
	    curl_extra_args="-k"
	fi
	head=$(curl -nsf $curl_extra_args "$remote/$remote_name") &&
	expr "$head" : "$_x40\$" >/dev/null ||
		die "Failed to fetch $remote_name from $remote"
	echo Fetching "$remote_name from $remote" using http
	git-http-fetch -v -a "$head" "$remote/" || exit
	;;
    rsync://*)
	TMP_HEAD="$GIT_DIR/TMP_HEAD"
	rsync -L -q "$remote/$remote_name" "$TMP_HEAD" || exit 1
	head=$(git-rev-parse TMP_HEAD)
	rm -f "$TMP_HEAD"
	test "$rsync_slurped_objects" || {
	    rsync -av --ignore-existing --exclude info \
		"$remote/objects/" "$GIT_OBJECT_DIRECTORY/" || exit

	    # Look at objects/info/alternates for rsync -- http will
	    # support it natively and git native ones will do it on the remote
	    # end.  Not having that file is not a crime.
	    rsync -q "$remote/objects/info/alternates" \
		"$GIT_DIR/TMP_ALT" 2>/dev/null ||
		rm -f "$GIT_DIR/TMP_ALT"
	    if test -f "$GIT_DIR/TMP_ALT"
	    then
		resolve_alternates "$remote" <"$GIT_DIR/TMP_ALT" |
		while read alt
		do
		    case "$alt" in 'bad alternate: '*) die "$alt";; esac
		    echo >&2 "Getting alternate: $alt"
		    rsync -av --ignore-existing --exclude info \
		    "$alt" "$GIT_OBJECT_DIRECTORY/" || exit
		done
		rm -f "$GIT_DIR/TMP_ALT"
	    fi
	    rsync_slurped_objects=t
	}
	;;
    *)
	# We will do git native transport with just one call later.
	continue ;;
    esac

    append_fetch_head "$head" "$remote" "$remote_name" "$remote_nick" "$local_name"

done

case "$remote" in
http://* | https://* | rsync://* )
    ;; # we are already done.
*)
    (
	git-fetch-pack "$remote" $rref || echo failed "$remote"
    ) |
    while read sha1 remote_name
    do
	case "$sha1" in
	failed)
		echo >&2 "Fetch failure: $remote"
		exit 1 ;;
	esac
	found=
	single_force=
	for ref in $refs
	do
	    case "$ref" in
	    +$remote_name:*)
		single_force=t
		found="$ref"
		break ;;
	    $remote_name:*)
		found="$ref"
		break ;;
	    esac
	done

	local_name=$(expr "$found" : '[^:]*:\(.*\)')
	append_fetch_head "$sha1" "$remote" "$remote_name" "$remote_nick" "$local_name"
    done || exit
    ;;
esac

# If the original head was empty (i.e. no "master" yet), or
# if we were told not to worry, we do not have to check.
case ",$update_head_ok,$orig_head," in
*,, | t,* )
	;;
*)
	curr_head=$(cat "$GIT_DIR/HEAD" 2>/dev/null)
	if test "$curr_head" != "$orig_head"
	then
		echo "$orig_head" >$GIT_DIR/HEAD
		die "Cannot fetch into the current branch."
	fi
	;;
esac