1#!/bin/sh
2#
3. git-sh-setup || die "Not a git archive"
4. git-parse-remote
5_x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
6_x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40"
7append=
9force=
10update_head_ok=
11while case "$#" in 0) break ;; esac
12do
13 case "$1" in
14 -a|--a|--ap|--app|--appe|--appen|--append)
15 append=t
16 ;;
17 -f|--f|--fo|--for|--forc|--force)
18 force=t
19 ;;
20 -u|--u|--up|--upd|--upda|--updat|--update|--update-|--update-h|\
21 --update-he|--update-hea|--update-head|--update-head-|\
22 --update-head-o|--update-head-ok)
23 update_head_ok=t
24 ;;
25 *)
26 break
27 ;;
28 esac
29 shift
30done
31case "$#" in
330)
34 test -f "$GIT_DIR/branches/origin" ||
35 test -f "$GIT_DIR/remotes/origin" ||
36 die "Where do you want to fetch from today?"
37 set origin ;;
38esac
39remote_nick="$1"
41remote=$(get_remote_url "$@")
42refs=
43rref=
44rsync_slurped_objects=
45if test "" = "$append"
47then
48 : >$GIT_DIR/FETCH_HEAD
49fi
50append_fetch_head () {
52 head_="$1"
53 remote_="$2"
54 remote_name_="$3"
55 remote_nick_="$4"
56 local_name_="$5"
57 # remote-nick is the URL given on the command line (or a shorthand)
59 # remote-name is the $GIT_DIR relative refs/ path we computed
60 # for this refspec.
61 case "$remote_name_" in
62 HEAD)
63 note_= ;;
64 refs/heads/*)
65 note_="$(expr "$remote_name_" : 'refs/heads/\(.*\)')"
66 note_="branch '$note_' of " ;;
67 refs/tags/*)
68 note_="$(expr "$remote_name_" : 'refs/tags/\(.*\)')"
69 note_="tag '$note_' of " ;;
70 *)
71 note_="$remote_name of " ;;
72 esac
73 remote_1_=$(expr "$remote_" : '\(.*\)\.git/*$') &&
74 remote_="$remote_1_"
75 note_="$note_$remote_"
76 # 2.6.11-tree tag would not be happy to be fed to resolve.
78 if git-cat-file commit "$head_" >/dev/null 2>&1
79 then
80 headc_=$(git-rev-parse --verify "$head_^0") || exit
81 echo "$headc_ $note_" >>$GIT_DIR/FETCH_HEAD
82 echo >&2 "* committish: $head_"
83 echo >&2 " $note_"
84 else
85 echo >&2 "* non-commit: $head_"
86 echo >&2 " $note_"
87 fi
88 if test "$local_name_" != ""
89 then
90 # We are storing the head locally. Make sure that it is
91 # a fast forward (aka "reverse push").
92 fast_forward_local "$local_name_" "$head_" "$note_"
93 fi
94}
95fast_forward_local () {
97 mkdir -p "$(dirname "$GIT_DIR/$1")"
98 case "$1" in
99 refs/tags/*)
100 # Tags need not be pointing at commits so there
101 # is no way to guarantee "fast-forward" anyway.
102 if test -f "$GIT_DIR/$1"
103 then
104 echo >&2 "* $1: updating with $3"
105 else
106 echo >&2 "* $1: storing $3"
107 fi
108 echo "$2" >"$GIT_DIR/$1" ;;
109 refs/heads/*)
111 # NEEDSWORK: use the same cmpxchg protocol here.
112 echo "$2" >"$GIT_DIR/$1.lock"
113 if test -f "$GIT_DIR/$1"
114 then
115 local=$(git-rev-parse --verify "$1^0") &&
116 mb=$(git-merge-base "$local" "$2") &&
117 case "$2,$mb" in
118 $local,*)
119 echo >&2 "* $1: same as $3"
120 ;;
121 *,$local)
122 echo >&2 "* $1: fast forward to $3"
123 ;;
124 *)
125 false
126 ;;
127 esac || {
128 echo >&2 "* $1: does not fast forward to $3;"
129 case "$force,$single_force" in
130 t,* | *,t)
131 echo >&2 " forcing update."
132 ;;
133 *)
134 mv "$GIT_DIR/$1.lock" "$GIT_DIR/$1.remote"
135 echo >&2 " leaving it in '$1.remote'"
136 ;;
137 esac
138 }
139 else
140 echo >&2 "* $1: storing $3"
141 fi
142 test -f "$GIT_DIR/$1.lock" &&
143 mv "$GIT_DIR/$1.lock" "$GIT_DIR/$1"
144 ;;
145 esac
146}
147case "$update_head_ok" in
149'')
150 orig_head=$(cat "$GIT_DIR/HEAD" 2>/dev/null)
151 ;;
152esac
153for ref in $(get_remote_refs_for_fetch "$@")
155do
156 refs="$refs $ref"
157 # These are relative path from $GIT_DIR, typically starting at refs/
159 # but may be HEAD
160 if expr "$ref" : '\+' >/dev/null
161 then
162 single_force=t
163 ref=$(expr "$ref" : '\+\(.*\)')
164 else
165 single_force=
166 fi
167 remote_name=$(expr "$ref" : '\([^:]*\):')
168 local_name=$(expr "$ref" : '[^:]*:\(.*\)')
169 rref="$rref $remote_name"
171 # There are transports that can fetch only one head at a time...
173 case "$remote" in
174 http://* | https://*)
175 if [ -n "$GIT_SSL_NO_VERIFY" ]; then
176 curl_extra_args="-k"
177 fi
178 head=$(curl -nsf $curl_extra_args "$remote/$remote_name") &&
179 expr "$head" : "$_x40\$" >/dev/null ||
180 die "Failed to fetch $remote_name from $remote"
181 echo Fetching "$remote_name from $remote" using http
182 git-http-fetch -v -a "$head" "$remote/" || exit
183 ;;
184 rsync://*)
185 TMP_HEAD="$GIT_DIR/TMP_HEAD"
186 rsync -L -q "$remote/$remote_name" "$TMP_HEAD" || exit 1
187 head=$(git-rev-parse TMP_HEAD)
188 rm -f "$TMP_HEAD"
189 test "$rsync_slurped_objects" || {
190 rsync -av --ignore-existing --exclude info \
191 "$remote/objects/" "$GIT_OBJECT_DIRECTORY/" || exit
192 # Look at objects/info/alternates for rsync -- http will
194 # support it natively and git native ones will do it on the remote
195 # end. Not having that file is not a crime.
196 rsync -q "$remote/objects/info/alternates" "$GIT_DIR/TMP_ALT" ||
197 rm -f "$GIT_DIR/TMP_ALT"
198 if test -f "$GIT_DIR/TMP_ALT"
199 then
200 resolve_alternates "$remote" <"$GIT_DIR/TMP_ALT" |
201 while read alt
202 do
203 case "$alt" in 'bad alternate: '*) die "$alt";; esac
204 echo >&2 "Getting alternate: $alt"
205 rsync -av --ignore-existing --exclude info \
206 "$alt" "$GIT_OBJECT_DIRECTORY/" || exit
207 done
208 rm -f "$GIT_DIR/TMP_ALT"
209 fi
210 rsync_slurped_objects=t
211 }
212 ;;
213 *)
214 # We will do git native transport with just one call later.
215 continue ;;
216 esac
217 append_fetch_head "$head" "$remote" "$remote_name" "$remote_nick" "$local_name"
219done
221case "$remote" in
223http://* | https://* | rsync://* )
224 ;; # we are already done.
225*)
226 (
227 git-fetch-pack "$remote" $rref || echo failed "$remote"
228 ) |
229 while read sha1 remote_name
230 do
231 case "$sha1" in
232 failed)
233 echo >&2 "Fetch failure: $remote"
234 exit 1 ;;
235 esac
236 found=
237 single_force=
238 for ref in $refs
239 do
240 case "$ref" in
241 +$remote_name:*)
242 single_force=t
243 found="$ref"
244 break ;;
245 $remote_name:*)
246 found="$ref"
247 break ;;
248 esac
249 done
250 local_name=$(expr "$found" : '[^:]*:\(.*\)')
252 append_fetch_head "$sha1" "$remote" "$remote_name" "$remote_nick" "$local_name"
253 done || exit
254 ;;
255esac
256# If the original head was empty (i.e. no "master" yet), or
258# if we were told not to worry, we do not have to check.
259case ",$update_head_ok,$orig_head," in
260*,, | t,* )
261 ;;
262*)
263 curr_head=$(cat "$GIT_DIR/HEAD" 2>/dev/null)
264 if test "$curr_head" != "$orig_head"
265 then
266 echo "$orig_head" >$GIT_DIR/HEAD
267 die "Cannot fetch into the current branch."
268 fi
269 ;;
270esac