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