Merge branch 'jc/bare'
[git] / git-fetch.sh
1 #!/bin/sh
2 #
3
4 USAGE='<fetch-options> <repository> <refspec>...'
5 SUBDIRECTORY_OK=Yes
6 . git-sh-setup
7 set_reflog_action "fetch $*"
8
9 TOP=$(git-rev-parse --show-cdup)
10 if test ! -z "$TOP"
11 then
12         cd "$TOP"
13 fi
14 . git-parse-remote
15 _x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
16 _x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40"
17
18 LF='
19 '
20 IFS="$LF"
21
22 no_tags=
23 tags=
24 append=
25 force=
26 verbose=
27 update_head_ok=
28 exec=
29 upload_pack=
30 keep=
31 shallow_depth=
32 while case "$#" in 0) break ;; esac
33 do
34         case "$1" in
35         -a|--a|--ap|--app|--appe|--appen|--append)
36                 append=t
37                 ;;
38         --upl|--uplo|--uploa|--upload|--upload-|--upload-p|\
39         --upload-pa|--upload-pac|--upload-pack)
40                 shift
41                 exec="--exec=$1" 
42                 upload_pack="-u $1"
43                 ;;
44         -f|--f|--fo|--for|--forc|--force)
45                 force=t
46                 ;;
47         -t|--t|--ta|--tag|--tags)
48                 tags=t
49                 ;;
50         -n|--n|--no|--no-|--no-t|--no-ta|--no-tag|--no-tags)
51                 no_tags=t
52                 ;;
53         -u|--u|--up|--upd|--upda|--updat|--update|--update-|--update-h|\
54         --update-he|--update-hea|--update-head|--update-head-|\
55         --update-head-o|--update-head-ok)
56                 update_head_ok=t
57                 ;;
58         -v|--verbose)
59                 verbose=Yes
60                 ;;
61         -k|--k|--ke|--kee|--keep)
62                 keep='-k -k'
63                 ;;
64         --depth=*)
65                 shallow_depth="--depth=`expr "z$1" : 'z-[^=]*=\(.*\)'`"
66                 ;;
67         --depth)
68                 shift
69                 shallow_depth="--depth=$1"
70                 ;;
71         -*)
72                 usage
73                 ;;
74         *)
75                 break
76                 ;;
77         esac
78         shift
79 done
80
81 case "$#" in
82 0)
83         origin=$(get_default_remote)
84         test -n "$(get_remote_url ${origin})" ||
85                 die "Where do you want to fetch from today?"
86         set x $origin ; shift ;;
87 esac
88
89 remote_nick="$1"
90 remote=$(get_remote_url "$@")
91 refs=
92 rref=
93 rsync_slurped_objects=
94
95 if test "" = "$append"
96 then
97         : >"$GIT_DIR/FETCH_HEAD"
98 fi
99
100 # Global that is reused later
101 ls_remote_result=$(git ls-remote $upload_pack "$remote") ||
102         die "Cannot get the repository state from $remote"
103
104 append_fetch_head () {
105     head_="$1"
106     remote_="$2"
107     remote_name_="$3"
108     remote_nick_="$4"
109     local_name_="$5"
110     case "$6" in
111     t) not_for_merge_='not-for-merge' ;;
112     '') not_for_merge_= ;;
113     esac
114
115     # remote-nick is the URL given on the command line (or a shorthand)
116     # remote-name is the $GIT_DIR relative refs/ path we computed
117     # for this refspec.
118
119     # the $note_ variable will be fed to git-fmt-merge-msg for further
120     # processing.
121     case "$remote_name_" in
122     HEAD)
123         note_= ;;
124     refs/heads/*)
125         note_="$(expr "$remote_name_" : 'refs/heads/\(.*\)')"
126         note_="branch '$note_' of " ;;
127     refs/tags/*)
128         note_="$(expr "$remote_name_" : 'refs/tags/\(.*\)')"
129         note_="tag '$note_' of " ;;
130     refs/remotes/*)
131         note_="$(expr "$remote_name_" : 'refs/remotes/\(.*\)')"
132         note_="remote branch '$note_' of " ;;
133     *)
134         note_="$remote_name of " ;;
135     esac
136     remote_1_=$(expr "z$remote_" : 'z\(.*\)\.git/*$') &&
137         remote_="$remote_1_"
138     note_="$note_$remote_"
139
140     # 2.6.11-tree tag would not be happy to be fed to resolve.
141     if git-cat-file commit "$head_" >/dev/null 2>&1
142     then
143         headc_=$(git-rev-parse --verify "$head_^0") || exit
144         echo "$headc_   $not_for_merge_ $note_" >>"$GIT_DIR/FETCH_HEAD"
145     else
146         echo "$head_    not-for-merge   $note_" >>"$GIT_DIR/FETCH_HEAD"
147     fi
148
149     update_local_ref "$local_name_" "$head_" "$note_"
150 }
151
152 update_local_ref () {
153     # If we are storing the head locally make sure that it is
154     # a fast forward (aka "reverse push").
155
156     label_=$(git-cat-file -t $2)
157     newshort_=$(git-rev-parse --short $2)
158     if test -z "$1" ; then
159         [ "$verbose" ] && echo >&2 "* fetched $3"
160         [ "$verbose" ] && echo >&2 "  $label_: $newshort_"
161         return 0
162     fi
163     oldshort_=$(git show-ref --hash --abbrev "$1" 2>/dev/null)
164
165     case "$1" in
166     refs/tags/*)
167         # Tags need not be pointing at commits so there
168         # is no way to guarantee "fast-forward" anyway.
169         if test -n "$oldshort_"
170         then
171                 if now_=$(git show-ref --hash "$1") && test "$now_" = "$2"
172                 then
173                         [ "$verbose" ] && echo >&2 "* $1: same as $3"
174                         [ "$verbose" ] && echo >&2 "  $label_: $newshort_" ||:
175                 else
176                         echo >&2 "* $1: updating with $3"
177                         echo >&2 "  $label_: $newshort_"
178                         git-update-ref -m "$GIT_REFLOG_ACTION: updating tag" "$1" "$2"
179                 fi
180         else
181                 echo >&2 "* $1: storing $3"
182                 echo >&2 "  $label_: $newshort_"
183                 git-update-ref -m "$GIT_REFLOG_ACTION: storing tag" "$1" "$2"
184         fi
185         ;;
186
187     refs/heads/* | refs/remotes/*)
188         # $1 is the ref being updated.
189         # $2 is the new value for the ref.
190         local=$(git-rev-parse --verify "$1^0" 2>/dev/null)
191         if test "$local"
192         then
193             # Require fast-forward.
194             mb=$(git-merge-base "$local" "$2") &&
195             case "$2,$mb" in
196             $local,*)
197                 if test -n "$verbose"
198                 then
199                         echo >&2 "* $1: same as $3"
200                         echo >&2 "  $label_: $newshort_"
201                 fi
202                 ;;
203             *,$local)
204                 echo >&2 "* $1: fast forward to $3"
205                 echo >&2 "  old..new: $oldshort_..$newshort_"
206                 git-update-ref -m "$GIT_REFLOG_ACTION: fast-forward" "$1" "$2" "$local"
207                 ;;
208             *)
209                 false
210                 ;;
211             esac || {
212                 case ",$force,$single_force," in
213                 *,t,*)
214                         echo >&2 "* $1: forcing update to non-fast forward $3"
215                         echo >&2 "  old...new: $oldshort_...$newshort_"
216                         git-update-ref -m "$GIT_REFLOG_ACTION: forced-update" "$1" "$2" "$local"
217                         ;;
218                 *)
219                         echo >&2 "* $1: not updating to non-fast forward $3"
220                         echo >&2 "  old...new: $oldshort_...$newshort_"
221                         exit 1
222                         ;;
223                 esac
224             }
225         else
226             echo >&2 "* $1: storing $3"
227             echo >&2 "  $label_: $newshort_"
228             git-update-ref -m "$GIT_REFLOG_ACTION: storing head" "$1" "$2"
229         fi
230         ;;
231     esac
232 }
233
234 # updating the current HEAD with git-fetch in a bare
235 # repository is always fine.
236 if test -z "$update_head_ok" && test $(is_bare_repository) = false
237 then
238         orig_head=$(git-rev-parse --verify HEAD 2>/dev/null)
239 fi
240
241 # If --tags (and later --heads or --all) is specified, then we are
242 # not talking about defaults stored in Pull: line of remotes or
243 # branches file, and just fetch those and refspecs explicitly given.
244 # Otherwise we do what we always did.
245
246 reflist=$(get_remote_refs_for_fetch "$@")
247 if test "$tags"
248 then
249         taglist=`IFS='  ' &&
250                   echo "$ls_remote_result" |
251                   while read sha1 name
252                   do
253                         case "$sha1" in
254                         fail)
255                                 exit 1
256                         esac
257                         case "$name" in
258                         *^*) continue ;;
259                         refs/tags/*) ;;
260                         *) continue ;;
261                         esac
262                         if git-check-ref-format "$name"
263                         then
264                             echo ".${name}:${name}"
265                         else
266                             echo >&2 "warning: tag ${name} ignored"
267                         fi
268                   done` || exit
269         if test "$#" -gt 1
270         then
271                 # remote URL plus explicit refspecs; we need to merge them.
272                 reflist="$reflist$LF$taglist"
273         else
274                 # No explicit refspecs; fetch tags only.
275                 reflist=$taglist
276         fi
277 fi
278
279 fetch_main () {
280   reflist="$1"
281   refs=
282   rref=
283
284   for ref in $reflist
285   do
286       refs="$refs$LF$ref"
287
288       # These are relative path from $GIT_DIR, typically starting at refs/
289       # but may be HEAD
290       if expr "z$ref" : 'z\.' >/dev/null
291       then
292           not_for_merge=t
293           ref=$(expr "z$ref" : 'z\.\(.*\)')
294       else
295           not_for_merge=
296       fi
297       if expr "z$ref" : 'z+' >/dev/null
298       then
299           single_force=t
300           ref=$(expr "z$ref" : 'z+\(.*\)')
301       else
302           single_force=
303       fi
304       remote_name=$(expr "z$ref" : 'z\([^:]*\):')
305       local_name=$(expr "z$ref" : 'z[^:]*:\(.*\)')
306
307       rref="$rref$LF$remote_name"
308
309       # There are transports that can fetch only one head at a time...
310       case "$remote" in
311       http://* | https://* | ftp://*)
312           test -n "$shallow_depth" &&
313                 die "shallow clone with http not supported"
314           proto=`expr "$remote" : '\([^:]*\):'`
315           if [ -n "$GIT_SSL_NO_VERIFY" ]; then
316               curl_extra_args="-k"
317           fi
318           if [ -n "$GIT_CURL_FTP_NO_EPSV" -o \
319                 "`git-repo-config --bool http.noEPSV`" = true ]; then
320               noepsv_opt="--disable-epsv"
321           fi
322
323           # Find $remote_name from ls-remote output.
324           head=$(
325                 IFS='   '
326                 echo "$ls_remote_result" |
327                 while read sha1 name
328                 do
329                         test "z$name" = "z$remote_name" || continue
330                         echo "$sha1"
331                         break
332                 done
333           )
334           expr "z$head" : "z$_x40\$" >/dev/null ||
335                 die "No such ref $remote_name at $remote"
336           echo >&2 "Fetching $remote_name from $remote using $proto"
337           git-http-fetch -v -a "$head" "$remote/" || exit
338           ;;
339       rsync://*)
340           test -n "$shallow_depth" &&
341                 die "shallow clone with rsync not supported"
342           TMP_HEAD="$GIT_DIR/TMP_HEAD"
343           rsync -L -q "$remote/$remote_name" "$TMP_HEAD" || exit 1
344           head=$(git-rev-parse --verify TMP_HEAD)
345           rm -f "$TMP_HEAD"
346           test "$rsync_slurped_objects" || {
347               rsync -av --ignore-existing --exclude info \
348                   "$remote/objects/" "$GIT_OBJECT_DIRECTORY/" || exit
349
350               # Look at objects/info/alternates for rsync -- http will
351               # support it natively and git native ones will do it on
352               # the remote end.  Not having that file is not a crime.
353               rsync -q "$remote/objects/info/alternates" \
354                   "$GIT_DIR/TMP_ALT" 2>/dev/null ||
355                   rm -f "$GIT_DIR/TMP_ALT"
356               if test -f "$GIT_DIR/TMP_ALT"
357               then
358                   resolve_alternates "$remote" <"$GIT_DIR/TMP_ALT" |
359                   while read alt
360                   do
361                       case "$alt" in 'bad alternate: '*) die "$alt";; esac
362                       echo >&2 "Getting alternate: $alt"
363                       rsync -av --ignore-existing --exclude info \
364                       "$alt" "$GIT_OBJECT_DIRECTORY/" || exit
365                   done
366                   rm -f "$GIT_DIR/TMP_ALT"
367               fi
368               rsync_slurped_objects=t
369           }
370           ;;
371       *)
372           # We will do git native transport with just one call later.
373           continue ;;
374       esac
375
376       append_fetch_head "$head" "$remote" \
377           "$remote_name" "$remote_nick" "$local_name" "$not_for_merge" || exit
378
379   done
380
381   case "$remote" in
382   http://* | https://* | ftp://* | rsync://* )
383       ;; # we are already done.
384   *)
385     ( : subshell because we muck with IFS
386       IFS="     $LF"
387       (
388           git-fetch-pack --thin $exec $keep $shallow_depth "$remote" $rref ||
389           echo failed "$remote"
390       ) |
391       (
392         trap '
393                 if test -n "$keepfile" && test -f "$keepfile"
394                 then
395                         rm -f "$keepfile"
396                 fi
397         ' 0
398
399         keepfile=
400         while read sha1 remote_name
401         do
402           case "$sha1" in
403           failed)
404                   echo >&2 "Fetch failure: $remote"
405                   exit 1 ;;
406           # special line coming from index-pack with the pack name
407           pack)
408                   continue ;;
409           keep)
410                   keepfile="$GIT_OBJECT_DIRECTORY/pack/pack-$remote_name.keep"
411                   continue ;;
412           esac
413           found=
414           single_force=
415           for ref in $refs
416           do
417               case "$ref" in
418               +$remote_name:*)
419                   single_force=t
420                   not_for_merge=
421                   found="$ref"
422                   break ;;
423               .+$remote_name:*)
424                   single_force=t
425                   not_for_merge=t
426                   found="$ref"
427                   break ;;
428               .$remote_name:*)
429                   not_for_merge=t
430                   found="$ref"
431                   break ;;
432               $remote_name:*)
433                   not_for_merge=
434                   found="$ref"
435                   break ;;
436               esac
437           done
438           local_name=$(expr "z$found" : 'z[^:]*:\(.*\)')
439           append_fetch_head "$sha1" "$remote" \
440                   "$remote_name" "$remote_nick" "$local_name" \
441                   "$not_for_merge" || exit
442         done
443       )
444     ) || exit ;;
445   esac
446
447 }
448
449 fetch_main "$reflist" || exit
450
451 # automated tag following
452 case "$no_tags$tags" in
453 '')
454         case "$reflist" in
455         *:refs/*)
456                 # effective only when we are following remote branch
457                 # using local tracking branch.
458                 taglist=$(IFS=' ' &&
459                 echo "$ls_remote_result" |
460                 git-show-ref --exclude-existing=refs/tags/ |
461                 while read sha1 name
462                 do
463                         git-cat-file -t "$sha1" >/dev/null 2>&1 || continue
464                         echo >&2 "Auto-following $name"
465                         echo ".${name}:${name}"
466                 done)
467         esac
468         case "$taglist" in
469         '') ;;
470         ?*)
471                 # do not deepen a shallow tree when following tags
472                 shallow_depth=
473                 fetch_main "$taglist" || exit ;;
474         esac
475 esac
476
477 # If the original head was empty (i.e. no "master" yet), or
478 # if we were told not to worry, we do not have to check.
479 case "$orig_head" in
480 '')
481         ;;
482 ?*)
483         curr_head=$(git-rev-parse --verify HEAD 2>/dev/null)
484         if test "$curr_head" != "$orig_head"
485         then
486             git-update-ref \
487                         -m "$GIT_REFLOG_ACTION: Undoing incorrectly fetched HEAD." \
488                         HEAD "$orig_head"
489                 die "Cannot fetch into the current branch."
490         fi
491         ;;
492 esac