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