Merge branch 'jc/ident'
[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="$LF"
13
14 no_tags=
15 tags=
16 append=
17 force=
18 verbose=
19 update_head_ok=
20 exec=
21 upload_pack=
22 while case "$#" in 0) break ;; esac
23 do
24         case "$1" in
25         -a|--a|--ap|--app|--appe|--appen|--append)
26                 append=t
27                 ;;
28         --upl|--uplo|--uploa|--upload|--upload-|--upload-p|\
29         --upload-pa|--upload-pac|--upload-pack)
30                 shift
31                 exec="--exec=$1" 
32                 upload_pack="-u $1"
33                 ;;
34         -f|--f|--fo|--for|--forc|--force)
35                 force=t
36                 ;;
37         -t|--t|--ta|--tag|--tags)
38                 tags=t
39                 ;;
40         -n|--n|--no|--no-|--no-t|--no-ta|--no-tag|--no-tags)
41                 no_tags=t
42                 ;;
43         -u|--u|--up|--upd|--upda|--updat|--update|--update-|--update-h|\
44         --update-he|--update-hea|--update-head|--update-head-|\
45         --update-head-o|--update-head-ok)
46                 update_head_ok=t
47                 ;;
48         -v|--verbose)
49                 verbose=Yes
50                 ;;
51         -k|--k|--ke|--kee|--keep)
52                 keep=--keep
53                 ;;
54         -*)
55                 usage
56                 ;;
57         *)
58                 break
59                 ;;
60         esac
61         shift
62 done
63
64 case "$#" in
65 0)
66         test -f "$GIT_DIR/branches/origin" ||
67                 test -f "$GIT_DIR/remotes/origin" ||
68                         die "Where do you want to fetch from today?"
69         set origin ;;
70 esac
71
72 remote_nick="$1"
73 remote=$(get_remote_url "$@")
74 refs=
75 rref=
76 rsync_slurped_objects=
77
78 if test "" = "$append"
79 then
80         : >"$GIT_DIR/FETCH_HEAD"
81 fi
82
83 append_fetch_head () {
84     head_="$1"
85     remote_="$2"
86     remote_name_="$3"
87     remote_nick_="$4"
88     local_name_="$5"
89     case "$6" in
90     t) not_for_merge_='not-for-merge' ;;
91     '') not_for_merge_= ;;
92     esac
93
94     # remote-nick is the URL given on the command line (or a shorthand)
95     # remote-name is the $GIT_DIR relative refs/ path we computed
96     # for this refspec.
97     case "$remote_name_" in
98     HEAD)
99         note_= ;;
100     refs/heads/*)
101         note_="$(expr "$remote_name_" : 'refs/heads/\(.*\)')"
102         note_="branch '$note_' of " ;;
103     refs/tags/*)
104         note_="$(expr "$remote_name_" : 'refs/tags/\(.*\)')"
105         note_="tag '$note_' of " ;;
106     *)
107         note_="$remote_name of " ;;
108     esac
109     remote_1_=$(expr "$remote_" : '\(.*\)\.git/*$') &&
110         remote_="$remote_1_"
111     note_="$note_$remote_"
112
113     # 2.6.11-tree tag would not be happy to be fed to resolve.
114     if git-cat-file commit "$head_" >/dev/null 2>&1
115     then
116         headc_=$(git-rev-parse --verify "$head_^0") || exit
117         echo "$headc_   $not_for_merge_ $note_" >>"$GIT_DIR/FETCH_HEAD"
118         [ "$verbose" ] && echo >&2 "* committish: $head_"
119         [ "$verbose" ] && echo >&2 "  $note_"
120     else
121         echo "$head_    not-for-merge   $note_" >>"$GIT_DIR/FETCH_HEAD"
122         [ "$verbose" ] && echo >&2 "* non-commit: $head_"
123         [ "$verbose" ] && echo >&2 "  $note_"
124     fi
125     if test "$local_name_" != ""
126     then
127         # We are storing the head locally.  Make sure that it is
128         # a fast forward (aka "reverse push").
129         fast_forward_local "$local_name_" "$head_" "$note_"
130     fi
131 }
132
133 fast_forward_local () {
134     mkdir -p "$(dirname "$GIT_DIR/$1")"
135     case "$1" in
136     refs/tags/*)
137         # Tags need not be pointing at commits so there
138         # is no way to guarantee "fast-forward" anyway.
139         if test -f "$GIT_DIR/$1"
140         then
141                 if now_=$(cat "$GIT_DIR/$1") && test "$now_" = "$2"
142                 then
143                         [ "$verbose" ] && echo >&2 "* $1: same as $3"
144                 else
145                         echo >&2 "* $1: updating with $3"
146                 fi
147         else
148                 echo >&2 "* $1: storing $3"
149         fi
150         git-update-ref "$1" "$2" 
151         ;;
152
153     refs/heads/*)
154         # $1 is the ref being updated.
155         # $2 is the new value for the ref.
156         local=$(git-rev-parse --verify "$1^0" 2>/dev/null)
157         if test "$local"
158         then
159             # Require fast-forward.
160             mb=$(git-merge-base "$local" "$2") &&
161             case "$2,$mb" in
162             $local,*)
163                 echo >&2 "* $1: same as $3"
164                 ;;
165             *,$local)
166                 echo >&2 "* $1: fast forward to $3"
167                 git-update-ref "$1" "$2" "$local"
168                 ;;
169             *)
170                 false
171                 ;;
172             esac || {
173                 echo >&2 "* $1: does not fast forward to $3;"
174                 case ",$force,$single_force," in
175                 *,t,*)
176                         echo >&2 "  forcing update."
177                         git-update-ref "$1" "$2" "$local"
178                         ;;
179                 *)
180                         echo >&2 "  not updating."
181                         ;;
182                 esac
183             }
184         else
185             echo >&2 "* $1: storing $3"
186             git-update-ref "$1" "$2"
187         fi
188         ;;
189     esac
190 }
191
192 case "$update_head_ok" in
193 '')
194         orig_head=$(git-rev-parse --verify HEAD 2>/dev/null)
195         ;;
196 esac
197
198 # If --tags (and later --heads or --all) is specified, then we are
199 # not talking about defaults stored in Pull: line of remotes or
200 # branches file, and just fetch those and refspecs explicitly given.
201 # Otherwise we do what we always did.
202
203 reflist=$(get_remote_refs_for_fetch "$@")
204 if test "$tags"
205 then
206         taglist=$(IFS=" " &&
207                   git-ls-remote $upload_pack --tags "$remote" |
208                   while read sha1 name
209                   do
210                         case "$name" in
211                         (*^*) continue ;;
212                         esac
213                         if git-check-ref-format "$name"
214                         then
215                             echo ".${name}:${name}"
216                         else
217                             echo >&2 "warning: tag ${name} ignored"
218                         fi
219                   done)
220         if test "$#" -gt 1
221         then
222                 # remote URL plus explicit refspecs; we need to merge them.
223                 reflist="$reflist$LF$taglist"
224         else
225                 # No explicit refspecs; fetch tags only.
226                 reflist=$taglist
227         fi
228 fi
229
230 fetch_main () {
231   reflist="$1"
232   refs=
233
234   for ref in $reflist
235   do
236       refs="$refs$LF$ref"
237
238       # These are relative path from $GIT_DIR, typically starting at refs/
239       # but may be HEAD
240       if expr "$ref" : '\.' >/dev/null
241       then
242           not_for_merge=t
243           ref=$(expr "$ref" : '\.\(.*\)')
244       else
245           not_for_merge=
246       fi
247       if expr "$ref" : '\+' >/dev/null
248       then
249           single_force=t
250           ref=$(expr "$ref" : '\+\(.*\)')
251       else
252           single_force=
253       fi
254       remote_name=$(expr "$ref" : '\([^:]*\):')
255       local_name=$(expr "$ref" : '[^:]*:\(.*\)')
256
257       rref="$rref$LF$remote_name"
258
259       # There are transports that can fetch only one head at a time...
260       case "$remote" in
261       http://* | https://*)
262           if [ -n "$GIT_SSL_NO_VERIFY" ]; then
263               curl_extra_args="-k"
264           fi
265           remote_name_quoted=$(perl -e '
266               my $u = $ARGV[0];
267               $u =~ s{([^-a-zA-Z0-9/.])}{sprintf"%%%02x",ord($1)}eg;
268               print "$u";
269           ' "$remote_name")
270           head=$(curl -nsfL $curl_extra_args "$remote/$remote_name_quoted") &&
271           expr "$head" : "$_x40\$" >/dev/null ||
272                   die "Failed to fetch $remote_name from $remote"
273           echo >&2 Fetching "$remote_name from $remote" using http
274           git-http-fetch -v -a "$head" "$remote/" || exit
275           ;;
276       rsync://*)
277           TMP_HEAD="$GIT_DIR/TMP_HEAD"
278           rsync -L -q "$remote/$remote_name" "$TMP_HEAD" || exit 1
279           head=$(git-rev-parse --verify TMP_HEAD)
280           rm -f "$TMP_HEAD"
281           test "$rsync_slurped_objects" || {
282               rsync -av --ignore-existing --exclude info \
283                   "$remote/objects/" "$GIT_OBJECT_DIRECTORY/" || exit
284
285               # Look at objects/info/alternates for rsync -- http will
286               # support it natively and git native ones will do it on
287               # the remote end.  Not having that file is not a crime.
288               rsync -q "$remote/objects/info/alternates" \
289                   "$GIT_DIR/TMP_ALT" 2>/dev/null ||
290                   rm -f "$GIT_DIR/TMP_ALT"
291               if test -f "$GIT_DIR/TMP_ALT"
292               then
293                   resolve_alternates "$remote" <"$GIT_DIR/TMP_ALT" |
294                   while read alt
295                   do
296                       case "$alt" in 'bad alternate: '*) die "$alt";; esac
297                       echo >&2 "Getting alternate: $alt"
298                       rsync -av --ignore-existing --exclude info \
299                       "$alt" "$GIT_OBJECT_DIRECTORY/" || exit
300                   done
301                   rm -f "$GIT_DIR/TMP_ALT"
302               fi
303               rsync_slurped_objects=t
304           }
305           ;;
306       *)
307           # We will do git native transport with just one call later.
308           continue ;;
309       esac
310
311       append_fetch_head "$head" "$remote" \
312           "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
313
314   done
315
316   case "$remote" in
317   http://* | https://* | rsync://* )
318       ;; # we are already done.
319   *)
320     ( : subshell because we muck with IFS
321       IFS="     $LF"
322       (
323           git-fetch-pack $exec $keep "$remote" $rref || echo failed "$remote"
324       ) |
325       while read sha1 remote_name
326       do
327           case "$sha1" in
328           failed)
329                   echo >&2 "Fetch failure: $remote"
330                   exit 1 ;;
331           esac
332           found=
333           single_force=
334           for ref in $refs
335           do
336               case "$ref" in
337               +$remote_name:*)
338                   single_force=t
339                   not_for_merge=
340                   found="$ref"
341                   break ;;
342               .+$remote_name:*)
343                   single_force=t
344                   not_for_merge=t
345                   found="$ref"
346                   break ;;
347               .$remote_name:*)
348                   not_for_merge=t
349                   found="$ref"
350                   break ;;
351               $remote_name:*)
352                   not_for_merge=
353                   found="$ref"
354                   break ;;
355               esac
356           done
357           local_name=$(expr "$found" : '[^:]*:\(.*\)')
358           append_fetch_head "$sha1" "$remote" \
359                   "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
360       done
361     ) || exit ;;
362   esac
363
364 }
365
366 fetch_main "$reflist"
367
368 # automated tag following
369 case "$no_tags$tags" in
370 '')
371         taglist=$(IFS=" " &&
372         git-ls-remote $upload_pack --tags "$remote" |
373         sed -ne 's|^\([0-9a-f]*\)[      ]\(refs/tags/.*\)^{}$|\1 \2|p' |
374         while read sha1 name
375         do
376                 test -f "$GIT_DIR/$name" && continue
377                 git-check-ref-format "$name" || {
378                         echo >&2 "warning: tag ${name} ignored"
379                         continue
380                 }
381                 git-cat-file -t "$sha1" >/dev/null 2>&1 || continue
382                 echo >&2 "Auto-following $name"
383                 echo ".${name}:${name}"
384         done)
385         case "$taglist" in
386         '') ;;
387         ?*)
388                 fetch_main "$taglist" ;;
389         esac
390 esac
391
392 # If the original head was empty (i.e. no "master" yet), or
393 # if we were told not to worry, we do not have to check.
394 case ",$update_head_ok,$orig_head," in
395 *,, | t,* )
396         ;;
397 *)
398         curr_head=$(git-rev-parse --verify HEAD 2>/dev/null)
399         if test "$curr_head" != "$orig_head"
400         then
401                 git-update-ref HEAD "$orig_head"
402                 die "Cannot fetch into the current branch."
403         fi
404         ;;
405 esac