revision: --topo-order and --unpacked
[git.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
98     # the $note_ variable will be fed to git-fmt-merge-msg for further
99     # processing.
100     case "$remote_name_" in
101     HEAD)
102         note_= ;;
103     refs/heads/*)
104         note_="$(expr "$remote_name_" : 'refs/heads/\(.*\)')"
105         note_="branch '$note_' of " ;;
106     refs/tags/*)
107         note_="$(expr "$remote_name_" : 'refs/tags/\(.*\)')"
108         note_="tag '$note_' of " ;;
109     refs/remotes/*)
110         note_="$(expr "$remote_name_" : 'refs/remotes/\(.*\)')"
111         note_="remote branch '$note_' of " ;;
112     *)
113         note_="$remote_name of " ;;
114     esac
115     remote_1_=$(expr "$remote_" : '\(.*\)\.git/*$') &&
116         remote_="$remote_1_"
117     note_="$note_$remote_"
118
119     # 2.6.11-tree tag would not be happy to be fed to resolve.
120     if git-cat-file commit "$head_" >/dev/null 2>&1
121     then
122         headc_=$(git-rev-parse --verify "$head_^0") || exit
123         echo "$headc_   $not_for_merge_ $note_" >>"$GIT_DIR/FETCH_HEAD"
124         [ "$verbose" ] && echo >&2 "* committish: $head_"
125         [ "$verbose" ] && echo >&2 "  $note_"
126     else
127         echo "$head_    not-for-merge   $note_" >>"$GIT_DIR/FETCH_HEAD"
128         [ "$verbose" ] && echo >&2 "* non-commit: $head_"
129         [ "$verbose" ] && echo >&2 "  $note_"
130     fi
131     if test "$local_name_" != ""
132     then
133         # We are storing the head locally.  Make sure that it is
134         # a fast forward (aka "reverse push").
135         fast_forward_local "$local_name_" "$head_" "$note_"
136     fi
137 }
138
139 fast_forward_local () {
140     mkdir -p "$(dirname "$GIT_DIR/$1")"
141     case "$1" in
142     refs/tags/*)
143         # Tags need not be pointing at commits so there
144         # is no way to guarantee "fast-forward" anyway.
145         if test -f "$GIT_DIR/$1"
146         then
147                 if now_=$(cat "$GIT_DIR/$1") && test "$now_" = "$2"
148                 then
149                         [ "$verbose" ] && echo >&2 "* $1: same as $3"
150                 else
151                         echo >&2 "* $1: updating with $3"
152                 fi
153         else
154                 echo >&2 "* $1: storing $3"
155         fi
156         git-update-ref "$1" "$2"
157         ;;
158
159     refs/heads/* | refs/remotes/*)
160         # $1 is the ref being updated.
161         # $2 is the new value for the ref.
162         local=$(git-rev-parse --verify "$1^0" 2>/dev/null)
163         if test "$local"
164         then
165             # Require fast-forward.
166             mb=$(git-merge-base "$local" "$2") &&
167             case "$2,$mb" in
168             $local,*)
169                 echo >&2 "* $1: same as $3"
170                 ;;
171             *,$local)
172                 echo >&2 "* $1: fast forward to $3"
173                 echo >&2 "  from $local to $2"
174                 git-update-ref "$1" "$2" "$local"
175                 ;;
176             *)
177                 false
178                 ;;
179             esac || {
180                 echo >&2 "* $1: does not fast forward to $3;"
181                 case ",$force,$single_force," in
182                 *,t,*)
183                         echo >&2 "  forcing update."
184                         git-update-ref "$1" "$2" "$local"
185                         ;;
186                 *)
187                         echo >&2 "  not updating."
188                         exit 1
189                         ;;
190                 esac
191             }
192         else
193             echo >&2 "* $1: storing $3"
194             git-update-ref "$1" "$2"
195         fi
196         ;;
197     esac
198 }
199
200 case "$update_head_ok" in
201 '')
202         orig_head=$(git-rev-parse --verify HEAD 2>/dev/null)
203         ;;
204 esac
205
206 # If --tags (and later --heads or --all) is specified, then we are
207 # not talking about defaults stored in Pull: line of remotes or
208 # branches file, and just fetch those and refspecs explicitly given.
209 # Otherwise we do what we always did.
210
211 reflist=$(get_remote_refs_for_fetch "$@")
212 if test "$tags"
213 then
214         taglist=$(IFS=" " &&
215                   git-ls-remote $upload_pack --tags "$remote" |
216                   while read sha1 name
217                   do
218                         case "$name" in
219                         (*^*) continue ;;
220                         esac
221                         if git-check-ref-format "$name"
222                         then
223                             echo ".${name}:${name}"
224                         else
225                             echo >&2 "warning: tag ${name} ignored"
226                         fi
227                   done)
228         if test "$#" -gt 1
229         then
230                 # remote URL plus explicit refspecs; we need to merge them.
231                 reflist="$reflist$LF$taglist"
232         else
233                 # No explicit refspecs; fetch tags only.
234                 reflist=$taglist
235         fi
236 fi
237
238 fetch_main () {
239   reflist="$1"
240   refs=
241
242   for ref in $reflist
243   do
244       refs="$refs$LF$ref"
245
246       # These are relative path from $GIT_DIR, typically starting at refs/
247       # but may be HEAD
248       if expr "$ref" : '\.' >/dev/null
249       then
250           not_for_merge=t
251           ref=$(expr "$ref" : '\.\(.*\)')
252       else
253           not_for_merge=
254       fi
255       if expr "$ref" : '\+' >/dev/null
256       then
257           single_force=t
258           ref=$(expr "$ref" : '\+\(.*\)')
259       else
260           single_force=
261       fi
262       remote_name=$(expr "$ref" : '\([^:]*\):')
263       local_name=$(expr "$ref" : '[^:]*:\(.*\)')
264
265       rref="$rref$LF$remote_name"
266
267       # There are transports that can fetch only one head at a time...
268       case "$remote" in
269       http://* | https://*)
270           if [ -n "$GIT_SSL_NO_VERIFY" ]; then
271               curl_extra_args="-k"
272           fi
273           remote_name_quoted=$(perl -e '
274               my $u = $ARGV[0];
275               $u =~ s{([^-a-zA-Z0-9/.])}{sprintf"%%%02x",ord($1)}eg;
276               print "$u";
277           ' "$remote_name")
278           head=$(curl -nsfL $curl_extra_args "$remote/$remote_name_quoted") &&
279           expr "$head" : "$_x40\$" >/dev/null ||
280                   die "Failed to fetch $remote_name from $remote"
281           echo >&2 Fetching "$remote_name from $remote" using http
282           git-http-fetch -v -a "$head" "$remote/" || exit
283           ;;
284       rsync://*)
285           TMP_HEAD="$GIT_DIR/TMP_HEAD"
286           rsync -L -q "$remote/$remote_name" "$TMP_HEAD" || exit 1
287           head=$(git-rev-parse --verify TMP_HEAD)
288           rm -f "$TMP_HEAD"
289           test "$rsync_slurped_objects" || {
290               rsync -av --ignore-existing --exclude info \
291                   "$remote/objects/" "$GIT_OBJECT_DIRECTORY/" || exit
292
293               # Look at objects/info/alternates for rsync -- http will
294               # support it natively and git native ones will do it on
295               # the remote end.  Not having that file is not a crime.
296               rsync -q "$remote/objects/info/alternates" \
297                   "$GIT_DIR/TMP_ALT" 2>/dev/null ||
298                   rm -f "$GIT_DIR/TMP_ALT"
299               if test -f "$GIT_DIR/TMP_ALT"
300               then
301                   resolve_alternates "$remote" <"$GIT_DIR/TMP_ALT" |
302                   while read alt
303                   do
304                       case "$alt" in 'bad alternate: '*) die "$alt";; esac
305                       echo >&2 "Getting alternate: $alt"
306                       rsync -av --ignore-existing --exclude info \
307                       "$alt" "$GIT_OBJECT_DIRECTORY/" || exit
308                   done
309                   rm -f "$GIT_DIR/TMP_ALT"
310               fi
311               rsync_slurped_objects=t
312           }
313           ;;
314       *)
315           # We will do git native transport with just one call later.
316           continue ;;
317       esac
318
319       append_fetch_head "$head" "$remote" \
320           "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
321
322   done
323
324   case "$remote" in
325   http://* | https://* | rsync://* )
326       ;; # we are already done.
327   *)
328     ( : subshell because we muck with IFS
329       IFS="     $LF"
330       (
331           git-fetch-pack $exec $keep --thin "$remote" $rref || echo failed "$remote"
332       ) |
333       while read sha1 remote_name
334       do
335           case "$sha1" in
336           failed)
337                   echo >&2 "Fetch failure: $remote"
338                   exit 1 ;;
339           esac
340           found=
341           single_force=
342           for ref in $refs
343           do
344               case "$ref" in
345               +$remote_name:*)
346                   single_force=t
347                   not_for_merge=
348                   found="$ref"
349                   break ;;
350               .+$remote_name:*)
351                   single_force=t
352                   not_for_merge=t
353                   found="$ref"
354                   break ;;
355               .$remote_name:*)
356                   not_for_merge=t
357                   found="$ref"
358                   break ;;
359               $remote_name:*)
360                   not_for_merge=
361                   found="$ref"
362                   break ;;
363               esac
364           done
365           local_name=$(expr "$found" : '[^:]*:\(.*\)')
366           append_fetch_head "$sha1" "$remote" \
367                   "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
368       done
369     ) || exit ;;
370   esac
371
372 }
373
374 fetch_main "$reflist"
375
376 # automated tag following
377 case "$no_tags$tags" in
378 '')
379         case "$reflist" in
380         *:refs/*)
381                 # effective only when we are following remote branch
382                 # using local tracking branch.
383                 taglist=$(IFS=" " &&
384                 git-ls-remote $upload_pack --tags "$remote" |
385                 sed -ne 's|^\([0-9a-f]*\)[      ]\(refs/tags/.*\)^{}$|\1 \2|p' |
386                 while read sha1 name
387                 do
388                         test -f "$GIT_DIR/$name" && continue
389                         git-check-ref-format "$name" || {
390                                 echo >&2 "warning: tag ${name} ignored"
391                                 continue
392                         }
393                         git-cat-file -t "$sha1" >/dev/null 2>&1 || continue
394                         echo >&2 "Auto-following $name"
395                         echo ".${name}:${name}"
396                 done)
397         esac
398         case "$taglist" in
399         '') ;;
400         ?*)
401                 fetch_main "$taglist" ;;
402         esac
403 esac
404
405 # If the original head was empty (i.e. no "master" yet), or
406 # if we were told not to worry, we do not have to check.
407 case ",$update_head_ok,$orig_head," in
408 *,, | t,* )
409         ;;
410 *)
411         curr_head=$(git-rev-parse --verify HEAD 2>/dev/null)
412         if test "$curr_head" != "$orig_head"
413         then
414                 git-update-ref HEAD "$orig_head"
415                 die "Cannot fetch into the current branch."
416         fi
417         ;;
418 esac