GIT 1.0.3
[git.git] / git-fetch.sh
1 #!/bin/sh
2 #
3
4 USAGE='<fetch-options> <repository> <refspec>...'
5 . git-sh-setup
6 . git-parse-remote
7 _x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
8 _x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40"
9
10 LF='
11 '
12 IFS="$LF"
13
14 tags=
15 append=
16 force=
17 verbose=
18 update_head_ok=
19 while case "$#" in 0) break ;; esac
20 do
21         case "$1" in
22         -a|--a|--ap|--app|--appe|--appen|--append)
23                 append=t
24                 ;;
25         -f|--f|--fo|--for|--forc|--force)
26                 force=t
27                 ;;
28         -t|--t|--ta|--tag|--tags)
29                 tags=t
30                 ;;
31         -u|--u|--up|--upd|--upda|--updat|--update|--update-|--update-h|\
32         --update-he|--update-hea|--update-head|--update-head-|\
33         --update-head-o|--update-head-ok)
34                 update_head_ok=t
35                 ;;
36         -v|--verbose)
37                 verbose=Yes
38                 ;;
39         -*)
40                 usage
41                 ;;
42         *)
43                 break
44                 ;;
45         esac
46         shift
47 done
48
49 case "$#" in
50 0)
51         test -f "$GIT_DIR/branches/origin" ||
52                 test -f "$GIT_DIR/remotes/origin" ||
53                         die "Where do you want to fetch from today?"
54         set origin ;;
55 esac
56
57 remote_nick="$1"
58 remote=$(get_remote_url "$@")
59 refs=
60 rref=
61 rsync_slurped_objects=
62
63 if test "" = "$append"
64 then
65         : >"$GIT_DIR/FETCH_HEAD"
66 fi
67
68 append_fetch_head () {
69     head_="$1"
70     remote_="$2"
71     remote_name_="$3"
72     remote_nick_="$4"
73     local_name_="$5"
74     case "$6" in
75     t) not_for_merge_='not-for-merge' ;;
76     '') not_for_merge_= ;;
77     esac
78
79     # remote-nick is the URL given on the command line (or a shorthand)
80     # remote-name is the $GIT_DIR relative refs/ path we computed
81     # for this refspec.
82     case "$remote_name_" in
83     HEAD)
84         note_= ;;
85     refs/heads/*)
86         note_="$(expr "$remote_name_" : 'refs/heads/\(.*\)')"
87         note_="branch '$note_' of " ;;
88     refs/tags/*)
89         note_="$(expr "$remote_name_" : 'refs/tags/\(.*\)')"
90         note_="tag '$note_' of " ;;
91     *)
92         note_="$remote_name of " ;;
93     esac
94     remote_1_=$(expr "$remote_" : '\(.*\)\.git/*$') &&
95         remote_="$remote_1_"
96     note_="$note_$remote_"
97
98     # 2.6.11-tree tag would not be happy to be fed to resolve.
99     if git-cat-file commit "$head_" >/dev/null 2>&1
100     then
101         headc_=$(git-rev-parse --verify "$head_^0") || exit
102         echo "$headc_   $not_for_merge_ $note_" >>"$GIT_DIR/FETCH_HEAD"
103         [ "$verbose" ] && echo >&2 "* committish: $head_"
104         [ "$verbose" ] && echo >&2 "  $note_"
105     else
106         echo "$head_    not-for-merge   $note_" >>"$GIT_DIR/FETCH_HEAD"
107         [ "$verbose" ] && echo >&2 "* non-commit: $head_"
108         [ "$verbose" ] && echo >&2 "  $note_"
109     fi
110     if test "$local_name_" != ""
111     then
112         # We are storing the head locally.  Make sure that it is
113         # a fast forward (aka "reverse push").
114         fast_forward_local "$local_name_" "$head_" "$note_"
115     fi
116 }
117
118 fast_forward_local () {
119     mkdir -p "$(dirname "$GIT_DIR/$1")"
120     case "$1" in
121     refs/tags/*)
122         # Tags need not be pointing at commits so there
123         # is no way to guarantee "fast-forward" anyway.
124         if test -f "$GIT_DIR/$1"
125         then
126                 if now_=$(cat "$GIT_DIR/$1") && test "$now_" = "$2"
127                 then
128                         [ "$verbose" ] && echo >&2 "* $1: same as $3"
129                 else
130                         echo >&2 "* $1: updating with $3"
131                 fi
132         else
133                 echo >&2 "* $1: storing $3"
134         fi
135         git-update-ref "$1" "$2" 
136         ;;
137
138     refs/heads/*)
139         # $1 is the ref being updated.
140         # $2 is the new value for the ref.
141         local=$(git-rev-parse --verify "$1^0" 2>/dev/null)
142         if test "$local"
143         then
144             # Require fast-forward.
145             mb=$(git-merge-base "$local" "$2") &&
146             case "$2,$mb" in
147             $local,*)
148                 echo >&2 "* $1: same as $3"
149                 ;;
150             *,$local)
151                 echo >&2 "* $1: fast forward to $3"
152                 git-update-ref "$1" "$2" "$local"
153                 ;;
154             *)
155                 false
156                 ;;
157             esac || {
158                 echo >&2 "* $1: does not fast forward to $3;"
159                 case ",$force,$single_force," in
160                 *,t,*)
161                         echo >&2 "  forcing update."
162                         git-update-ref "$1" "$2" "$local"
163                         ;;
164                 *)
165                         echo >&2 "  not updating."
166                         ;;
167                 esac
168             }
169         else
170             echo >&2 "* $1: storing $3"
171             git-update-ref "$1" "$2"
172         fi
173         ;;
174     esac
175 }
176
177 case "$update_head_ok" in
178 '')
179         orig_head=$(git-rev-parse --verify HEAD 2>/dev/null)
180         ;;
181 esac
182
183 # If --tags (and later --heads or --all) is specified, then we are
184 # not talking about defaults stored in Pull: line of remotes or
185 # branches file, and just fetch those and refspecs explicitly given.
186 # Otherwise we do what we always did.
187
188 reflist=$(get_remote_refs_for_fetch "$@")
189 if test "$tags"
190 then
191         taglist=$(git-ls-remote --tags "$remote" |
192                 sed -e '
193                         /\^/d
194                         s/^[^   ]*      //
195                         s/.*/&:&/')
196         if test "$#" -gt 1
197         then
198                 # remote URL plus explicit refspecs; we need to merge them.
199                 reflist="$reflist$LF$taglist"
200         else
201                 # No explicit refspecs; fetch tags only.
202                 reflist=$taglist
203         fi
204 fi
205
206 for ref in $reflist
207 do
208     refs="$refs$LF$ref"
209
210     # These are relative path from $GIT_DIR, typically starting at refs/
211     # but may be HEAD
212     if expr "$ref" : '\.' >/dev/null
213     then
214         not_for_merge=t
215         ref=$(expr "$ref" : '\.\(.*\)')
216     else
217         not_for_merge=
218     fi
219     if expr "$ref" : '\+' >/dev/null
220     then
221         single_force=t
222         ref=$(expr "$ref" : '\+\(.*\)')
223     else
224         single_force=
225     fi
226     remote_name=$(expr "$ref" : '\([^:]*\):')
227     local_name=$(expr "$ref" : '[^:]*:\(.*\)')
228
229     rref="$rref$LF$remote_name"
230
231     # There are transports that can fetch only one head at a time...
232     case "$remote" in
233     http://* | https://*)
234         if [ -n "$GIT_SSL_NO_VERIFY" ]; then
235             curl_extra_args="-k"
236         fi
237         remote_name_quoted=$(perl -e '
238             my $u = $ARGV[0];
239             $u =~ s{([^-a-zA-Z0-9/.])}{sprintf"%%%02x",ord($1)}eg;
240             print "$u";
241         ' "$remote_name")
242         head=$(curl -nsfL $curl_extra_args "$remote/$remote_name_quoted") &&
243         expr "$head" : "$_x40\$" >/dev/null ||
244                 die "Failed to fetch $remote_name from $remote"
245         echo >&2 Fetching "$remote_name from $remote" using http
246         git-http-fetch -v -a "$head" "$remote/" || exit
247         ;;
248     rsync://*)
249         TMP_HEAD="$GIT_DIR/TMP_HEAD"
250         rsync -L -q "$remote/$remote_name" "$TMP_HEAD" || exit 1
251         head=$(git-rev-parse --verify TMP_HEAD)
252         rm -f "$TMP_HEAD"
253         test "$rsync_slurped_objects" || {
254             rsync -av --ignore-existing --exclude info \
255                 "$remote/objects/" "$GIT_OBJECT_DIRECTORY/" || exit
256
257             # Look at objects/info/alternates for rsync -- http will
258             # support it natively and git native ones will do it on the remote
259             # end.  Not having that file is not a crime.
260             rsync -q "$remote/objects/info/alternates" \
261                 "$GIT_DIR/TMP_ALT" 2>/dev/null ||
262                 rm -f "$GIT_DIR/TMP_ALT"
263             if test -f "$GIT_DIR/TMP_ALT"
264             then
265                 resolve_alternates "$remote" <"$GIT_DIR/TMP_ALT" |
266                 while read alt
267                 do
268                     case "$alt" in 'bad alternate: '*) die "$alt";; esac
269                     echo >&2 "Getting alternate: $alt"
270                     rsync -av --ignore-existing --exclude info \
271                     "$alt" "$GIT_OBJECT_DIRECTORY/" || exit
272                 done
273                 rm -f "$GIT_DIR/TMP_ALT"
274             fi
275             rsync_slurped_objects=t
276         }
277         ;;
278     *)
279         # We will do git native transport with just one call later.
280         continue ;;
281     esac
282
283     append_fetch_head "$head" "$remote" \
284         "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
285
286 done
287
288 case "$remote" in
289 http://* | https://* | rsync://* )
290     ;; # we are already done.
291 *)
292     IFS="       $LF"
293     (
294         git-fetch-pack "$remote" $rref || echo failed "$remote"
295     ) |
296     while read sha1 remote_name
297     do
298         case "$sha1" in
299         failed)
300                 echo >&2 "Fetch failure: $remote"
301                 exit 1 ;;
302         esac
303         found=
304         single_force=
305         for ref in $refs
306         do
307             case "$ref" in
308             +$remote_name:*)
309                 single_force=t
310                 not_for_merge=
311                 found="$ref"
312                 break ;;
313             .+$remote_name:*)
314                 single_force=t
315                 not_for_merge=t
316                 found="$ref"
317                 break ;;
318             .$remote_name:*)
319                 not_for_merge=t
320                 found="$ref"
321                 break ;;
322             $remote_name:*)
323                 not_for_merge=
324                 found="$ref"
325                 break ;;
326             esac
327         done
328         local_name=$(expr "$found" : '[^:]*:\(.*\)')
329         append_fetch_head "$sha1" "$remote" \
330                 "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
331     done || exit
332     ;;
333 esac
334
335 # If the original head was empty (i.e. no "master" yet), or
336 # if we were told not to worry, we do not have to check.
337 case ",$update_head_ok,$orig_head," in
338 *,, | t,* )
339         ;;
340 *)
341         curr_head=$(git-rev-parse --verify HEAD 2>/dev/null)
342         if test "$curr_head" != "$orig_head"
343         then
344                 git-update-ref HEAD "$orig_head"
345                 die "Cannot fetch into the current branch."
346         fi
347         ;;
348 esac