Merge for-each-ref to sync gitweb fully with 'next'
[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="$LF"
13
14 rloga=fetch
15 no_tags=
16 tags=
17 append=
18 force=
19 verbose=
20 update_head_ok=
21 exec=
22 upload_pack=
23 keep=--thin
24 while case "$#" in 0) break ;; esac
25 do
26         case "$1" in
27         -a|--a|--ap|--app|--appe|--appen|--append)
28                 append=t
29                 ;;
30         --upl|--uplo|--uploa|--upload|--upload-|--upload-p|\
31         --upload-pa|--upload-pac|--upload-pack)
32                 shift
33                 exec="--exec=$1" 
34                 upload_pack="-u $1"
35                 ;;
36         -f|--f|--fo|--for|--forc|--force)
37                 force=t
38                 ;;
39         -t|--t|--ta|--tag|--tags)
40                 tags=t
41                 ;;
42         -n|--n|--no|--no-|--no-t|--no-ta|--no-tag|--no-tags)
43                 no_tags=t
44                 ;;
45         -u|--u|--up|--upd|--upda|--updat|--update|--update-|--update-h|\
46         --update-he|--update-hea|--update-head|--update-head-|\
47         --update-head-o|--update-head-ok)
48                 update_head_ok=t
49                 ;;
50         -v|--verbose)
51                 verbose=Yes
52                 ;;
53         -k|--k|--ke|--kee|--keep)
54                 keep=--keep
55                 ;;
56         --reflog-action=*)
57                 rloga=`expr "z$1" : 'z-[^=]*=\(.*\)'`
58                 ;;
59         -*)
60                 usage
61                 ;;
62         *)
63                 break
64                 ;;
65         esac
66         shift
67 done
68
69 case "$#" in
70 0)
71         origin=$(get_default_remote)
72         test -n "$(get_remote_url ${origin})" ||
73                 die "Where do you want to fetch from today?"
74         set x $origin ; shift ;;
75 esac
76
77 remote_nick="$1"
78 remote=$(get_remote_url "$@")
79 refs=
80 rref=
81 rsync_slurped_objects=
82
83 rloga="$rloga $remote_nick"
84 test "$remote_nick" = "$remote" || rloga="$rloga $remote"
85
86 if test "" = "$append"
87 then
88         : >"$GIT_DIR/FETCH_HEAD"
89 fi
90
91 append_fetch_head () {
92     head_="$1"
93     remote_="$2"
94     remote_name_="$3"
95     remote_nick_="$4"
96     local_name_="$5"
97     case "$6" in
98     t) not_for_merge_='not-for-merge' ;;
99     '') not_for_merge_= ;;
100     esac
101
102     # remote-nick is the URL given on the command line (or a shorthand)
103     # remote-name is the $GIT_DIR relative refs/ path we computed
104     # for this refspec.
105
106     # the $note_ variable will be fed to git-fmt-merge-msg for further
107     # processing.
108     case "$remote_name_" in
109     HEAD)
110         note_= ;;
111     refs/heads/*)
112         note_="$(expr "$remote_name_" : 'refs/heads/\(.*\)')"
113         note_="branch '$note_' of " ;;
114     refs/tags/*)
115         note_="$(expr "$remote_name_" : 'refs/tags/\(.*\)')"
116         note_="tag '$note_' of " ;;
117     refs/remotes/*)
118         note_="$(expr "$remote_name_" : 'refs/remotes/\(.*\)')"
119         note_="remote branch '$note_' of " ;;
120     *)
121         note_="$remote_name of " ;;
122     esac
123     remote_1_=$(expr "z$remote_" : 'z\(.*\)\.git/*$') &&
124         remote_="$remote_1_"
125     note_="$note_$remote_"
126
127     # 2.6.11-tree tag would not be happy to be fed to resolve.
128     if git-cat-file commit "$head_" >/dev/null 2>&1
129     then
130         headc_=$(git-rev-parse --verify "$head_^0") || exit
131         echo "$headc_   $not_for_merge_ $note_" >>"$GIT_DIR/FETCH_HEAD"
132     else
133         echo "$head_    not-for-merge   $note_" >>"$GIT_DIR/FETCH_HEAD"
134     fi
135
136     update_local_ref "$local_name_" "$head_" "$note_"
137 }
138
139 update_local_ref () {
140     # If we are storing the head locally make sure that it is
141     # a fast forward (aka "reverse push").
142
143     label_=$(git-cat-file -t $2)
144     newshort_=$(git-rev-parse --short $2)
145     if test -z "$1" ; then
146         [ "$verbose" ] && echo >&2 "* fetched $3"
147         [ "$verbose" ] && echo >&2 "  $label_: $newshort_"
148         return 0
149     fi
150     oldshort_=$(git-rev-parse --short "$1" 2>/dev/null)
151     mkdir -p "$(dirname "$GIT_DIR/$1")"
152     case "$1" in
153     refs/tags/*)
154         # Tags need not be pointing at commits so there
155         # is no way to guarantee "fast-forward" anyway.
156         if test -f "$GIT_DIR/$1"
157         then
158                 if now_=$(cat "$GIT_DIR/$1") && test "$now_" = "$2"
159                 then
160                         [ "$verbose" ] && echo >&2 "* $1: same as $3"
161                         [ "$verbose" ] && echo >&2 "  $label_: $newshort_" ||:
162                 else
163                         echo >&2 "* $1: updating with $3"
164                         echo >&2 "  $label_: $newshort_"
165                         git-update-ref -m "$rloga: updating tag" "$1" "$2"
166                 fi
167         else
168                 echo >&2 "* $1: storing $3"
169                 echo >&2 "  $label_: $newshort_"
170                 git-update-ref -m "$rloga: storing tag" "$1" "$2"
171         fi
172         ;;
173
174     refs/heads/* | refs/remotes/*)
175         # $1 is the ref being updated.
176         # $2 is the new value for the ref.
177         local=$(git-rev-parse --verify "$1^0" 2>/dev/null)
178         if test "$local"
179         then
180             # Require fast-forward.
181             mb=$(git-merge-base "$local" "$2") &&
182             case "$2,$mb" in
183             $local,*)
184                 if test -n "$verbose"
185                 then
186                         echo >&2 "* $1: same as $3"
187                         echo >&2 "  $label_: $newshort_"
188                 fi
189                 ;;
190             *,$local)
191                 echo >&2 "* $1: fast forward to $3"
192                 echo >&2 "  old..new: $oldshort_..$newshort_"
193                 git-update-ref -m "$rloga: fast-forward" "$1" "$2" "$local"
194                 ;;
195             *)
196                 false
197                 ;;
198             esac || {
199                 case ",$force,$single_force," in
200                 *,t,*)
201                         echo >&2 "* $1: forcing update to non-fast forward $3"
202                         echo >&2 "  old...new: $oldshort_...$newshort_"
203                         git-update-ref -m "$rloga: forced-update" "$1" "$2" "$local"
204                         ;;
205                 *)
206                         echo >&2 "* $1: not updating to non-fast forward $3"
207                         echo >&2 "  old...new: $oldshort_...$newshort_"
208                         exit 1
209                         ;;
210                 esac
211             }
212         else
213             echo >&2 "* $1: storing $3"
214             echo >&2 "  $label_: $newshort_"
215             git-update-ref -m "$rloga: storing head" "$1" "$2"
216         fi
217         ;;
218     esac
219 }
220
221 case "$update_head_ok" in
222 '')
223         orig_head=$(git-rev-parse --verify HEAD 2>/dev/null)
224         ;;
225 esac
226
227 # If --tags (and later --heads or --all) is specified, then we are
228 # not talking about defaults stored in Pull: line of remotes or
229 # branches file, and just fetch those and refspecs explicitly given.
230 # Otherwise we do what we always did.
231
232 reflist=$(get_remote_refs_for_fetch "$@")
233 if test "$tags"
234 then
235         taglist=`IFS="  " &&
236                   (
237                         git-ls-remote $upload_pack --tags "$remote" ||
238                         echo fail ouch
239                   ) |
240                   while read sha1 name
241                   do
242                         case "$sha1" in
243                         fail)
244                                 exit 1
245                         esac
246                         case "$name" in
247                         *^*) continue ;;
248                         esac
249                         if git-check-ref-format "$name"
250                         then
251                             echo ".${name}:${name}"
252                         else
253                             echo >&2 "warning: tag ${name} ignored"
254                         fi
255                   done` || exit
256         if test "$#" -gt 1
257         then
258                 # remote URL plus explicit refspecs; we need to merge them.
259                 reflist="$reflist$LF$taglist"
260         else
261                 # No explicit refspecs; fetch tags only.
262                 reflist=$taglist
263         fi
264 fi
265
266 fetch_main () {
267   reflist="$1"
268   refs=
269   rref=
270
271   for ref in $reflist
272   do
273       refs="$refs$LF$ref"
274
275       # These are relative path from $GIT_DIR, typically starting at refs/
276       # but may be HEAD
277       if expr "z$ref" : 'z\.' >/dev/null
278       then
279           not_for_merge=t
280           ref=$(expr "z$ref" : 'z\.\(.*\)')
281       else
282           not_for_merge=
283       fi
284       if expr "z$ref" : 'z+' >/dev/null
285       then
286           single_force=t
287           ref=$(expr "z$ref" : 'z+\(.*\)')
288       else
289           single_force=
290       fi
291       remote_name=$(expr "z$ref" : 'z\([^:]*\):')
292       local_name=$(expr "z$ref" : 'z[^:]*:\(.*\)')
293
294       rref="$rref$LF$remote_name"
295
296       # There are transports that can fetch only one head at a time...
297       case "$remote" in
298       http://* | https://* | ftp://*)
299           proto=`expr "$remote" : '\([^:]*\):'`
300           if [ -n "$GIT_SSL_NO_VERIFY" ]; then
301               curl_extra_args="-k"
302           fi
303           if [ -n "$GIT_CURL_FTP_NO_EPSV" -o \
304                 "`git-repo-config --bool http.noEPSV`" = true ]; then
305               noepsv_opt="--disable-epsv"
306           fi
307           max_depth=5
308           depth=0
309           head="ref: $remote_name"
310           while (expr "z$head" : "zref:" && expr $depth \< $max_depth) >/dev/null
311           do
312             remote_name_quoted=$(@@PERL@@ -e '
313               my $u = $ARGV[0];
314               $u =~ s/^ref:\s*//;
315               $u =~ s{([^-a-zA-Z0-9/.])}{sprintf"%%%02x",ord($1)}eg;
316               print "$u";
317           ' "$head")
318             head=$(curl -nsfL $curl_extra_args $noepsv_opt "$remote/$remote_name_quoted")
319             depth=$( expr \( $depth + 1 \) )
320           done
321           expr "z$head" : "z$_x40\$" >/dev/null ||
322               die "Failed to fetch $remote_name from $remote"
323           echo >&2 "Fetching $remote_name from $remote using $proto"
324           git-http-fetch -v -a "$head" "$remote/" || exit
325           ;;
326       rsync://*)
327           TMP_HEAD="$GIT_DIR/TMP_HEAD"
328           rsync -L -q "$remote/$remote_name" "$TMP_HEAD" || exit 1
329           head=$(git-rev-parse --verify TMP_HEAD)
330           rm -f "$TMP_HEAD"
331           test "$rsync_slurped_objects" || {
332               rsync -av --ignore-existing --exclude info \
333                   "$remote/objects/" "$GIT_OBJECT_DIRECTORY/" || exit
334
335               # Look at objects/info/alternates for rsync -- http will
336               # support it natively and git native ones will do it on
337               # the remote end.  Not having that file is not a crime.
338               rsync -q "$remote/objects/info/alternates" \
339                   "$GIT_DIR/TMP_ALT" 2>/dev/null ||
340                   rm -f "$GIT_DIR/TMP_ALT"
341               if test -f "$GIT_DIR/TMP_ALT"
342               then
343                   resolve_alternates "$remote" <"$GIT_DIR/TMP_ALT" |
344                   while read alt
345                   do
346                       case "$alt" in 'bad alternate: '*) die "$alt";; esac
347                       echo >&2 "Getting alternate: $alt"
348                       rsync -av --ignore-existing --exclude info \
349                       "$alt" "$GIT_OBJECT_DIRECTORY/" || exit
350                   done
351                   rm -f "$GIT_DIR/TMP_ALT"
352               fi
353               rsync_slurped_objects=t
354           }
355           ;;
356       *)
357           # We will do git native transport with just one call later.
358           continue ;;
359       esac
360
361       append_fetch_head "$head" "$remote" \
362           "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
363
364   done
365
366   case "$remote" in
367   http://* | https://* | ftp://* | rsync://* )
368       ;; # we are already done.
369   *)
370     ( : subshell because we muck with IFS
371       IFS="     $LF"
372       (
373           git-fetch-pack $exec $keep "$remote" $rref || echo failed "$remote"
374       ) |
375       while read sha1 remote_name
376       do
377           case "$sha1" in
378           failed)
379                   echo >&2 "Fetch failure: $remote"
380                   exit 1 ;;
381           esac
382           found=
383           single_force=
384           for ref in $refs
385           do
386               case "$ref" in
387               +$remote_name:*)
388                   single_force=t
389                   not_for_merge=
390                   found="$ref"
391                   break ;;
392               .+$remote_name:*)
393                   single_force=t
394                   not_for_merge=t
395                   found="$ref"
396                   break ;;
397               .$remote_name:*)
398                   not_for_merge=t
399                   found="$ref"
400                   break ;;
401               $remote_name:*)
402                   not_for_merge=
403                   found="$ref"
404                   break ;;
405               esac
406           done
407           local_name=$(expr "z$found" : 'z[^:]*:\(.*\)')
408           append_fetch_head "$sha1" "$remote" \
409                   "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
410       done
411     ) || exit ;;
412   esac
413
414 }
415
416 fetch_main "$reflist"
417
418 # automated tag following
419 case "$no_tags$tags" in
420 '')
421         case "$reflist" in
422         *:refs/*)
423                 # effective only when we are following remote branch
424                 # using local tracking branch.
425                 taglist=$(IFS=" " &&
426                 git-ls-remote $upload_pack --tags "$remote" |
427                 sed -ne 's|^\([0-9a-f]*\)[      ]\(refs/tags/.*\)^{}$|\1 \2|p' |
428                 while read sha1 name
429                 do
430                         test -f "$GIT_DIR/$name" && continue
431                         git-check-ref-format "$name" || {
432                                 echo >&2 "warning: tag ${name} ignored"
433                                 continue
434                         }
435                         git-cat-file -t "$sha1" >/dev/null 2>&1 || continue
436                         echo >&2 "Auto-following $name"
437                         echo ".${name}:${name}"
438                 done)
439         esac
440         case "$taglist" in
441         '') ;;
442         ?*)
443                 fetch_main "$taglist" ;;
444         esac
445 esac
446
447 # If the original head was empty (i.e. no "master" yet), or
448 # if we were told not to worry, we do not have to check.
449 case "$orig_head" in
450 '')
451         ;;
452 ?*)
453         curr_head=$(git-rev-parse --verify HEAD 2>/dev/null)
454         if test "$curr_head" != "$orig_head"
455         then
456             git-update-ref \
457                         -m "$rloga: Undoing incorrectly fetched HEAD." \
458                         HEAD "$orig_head"
459                 die "Cannot fetch into the current branch."
460         fi
461         ;;
462 esac