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[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                 echo >&2 "  from $local to $2"
168                 git-update-ref "$1" "$2" "$local"
169                 ;;
170             *)
171                 false
172                 ;;
173             esac || {
174                 echo >&2 "* $1: does not fast forward to $3;"
175                 case ",$force,$single_force," in
176                 *,t,*)
177                         echo >&2 "  forcing update."
178                         git-update-ref "$1" "$2" "$local"
179                         ;;
180                 *)
181                         echo >&2 "  not updating."
182                         ;;
183                 esac
184             }
185         else
186             echo >&2 "* $1: storing $3"
187             git-update-ref "$1" "$2"
188         fi
189         ;;
190     esac
191 }
192
193 case "$update_head_ok" in
194 '')
195         orig_head=$(git-rev-parse --verify HEAD 2>/dev/null)
196         ;;
197 esac
198
199 # If --tags (and later --heads or --all) is specified, then we are
200 # not talking about defaults stored in Pull: line of remotes or
201 # branches file, and just fetch those and refspecs explicitly given.
202 # Otherwise we do what we always did.
203
204 reflist=$(get_remote_refs_for_fetch "$@")
205 if test "$tags"
206 then
207         taglist=$(IFS=" " &&
208                   git-ls-remote $upload_pack --tags "$remote" |
209                   while read sha1 name
210                   do
211                         case "$name" in
212                         (*^*) continue ;;
213                         esac
214                         if git-check-ref-format "$name"
215                         then
216                             echo ".${name}:${name}"
217                         else
218                             echo >&2 "warning: tag ${name} ignored"
219                         fi
220                   done)
221         if test "$#" -gt 1
222         then
223                 # remote URL plus explicit refspecs; we need to merge them.
224                 reflist="$reflist$LF$taglist"
225         else
226                 # No explicit refspecs; fetch tags only.
227                 reflist=$taglist
228         fi
229 fi
230
231 fetch_main () {
232   reflist="$1"
233   refs=
234
235   for ref in $reflist
236   do
237       refs="$refs$LF$ref"
238
239       # These are relative path from $GIT_DIR, typically starting at refs/
240       # but may be HEAD
241       if expr "$ref" : '\.' >/dev/null
242       then
243           not_for_merge=t
244           ref=$(expr "$ref" : '\.\(.*\)')
245       else
246           not_for_merge=
247       fi
248       if expr "$ref" : '\+' >/dev/null
249       then
250           single_force=t
251           ref=$(expr "$ref" : '\+\(.*\)')
252       else
253           single_force=
254       fi
255       remote_name=$(expr "$ref" : '\([^:]*\):')
256       local_name=$(expr "$ref" : '[^:]*:\(.*\)')
257
258       rref="$rref$LF$remote_name"
259
260       # There are transports that can fetch only one head at a time...
261       case "$remote" in
262       http://* | https://*)
263           if [ -n "$GIT_SSL_NO_VERIFY" ]; then
264               curl_extra_args="-k"
265           fi
266           remote_name_quoted=$(perl -e '
267               my $u = $ARGV[0];
268               $u =~ s{([^-a-zA-Z0-9/.])}{sprintf"%%%02x",ord($1)}eg;
269               print "$u";
270           ' "$remote_name")
271           head=$(curl -nsfL $curl_extra_args "$remote/$remote_name_quoted") &&
272           expr "$head" : "$_x40\$" >/dev/null ||
273                   die "Failed to fetch $remote_name from $remote"
274           echo >&2 Fetching "$remote_name from $remote" using http
275           git-http-fetch -v -a "$head" "$remote/" || exit
276           ;;
277       rsync://*)
278           TMP_HEAD="$GIT_DIR/TMP_HEAD"
279           rsync -L -q "$remote/$remote_name" "$TMP_HEAD" || exit 1
280           head=$(git-rev-parse --verify TMP_HEAD)
281           rm -f "$TMP_HEAD"
282           test "$rsync_slurped_objects" || {
283               rsync -av --ignore-existing --exclude info \
284                   "$remote/objects/" "$GIT_OBJECT_DIRECTORY/" || exit
285
286               # Look at objects/info/alternates for rsync -- http will
287               # support it natively and git native ones will do it on
288               # the remote end.  Not having that file is not a crime.
289               rsync -q "$remote/objects/info/alternates" \
290                   "$GIT_DIR/TMP_ALT" 2>/dev/null ||
291                   rm -f "$GIT_DIR/TMP_ALT"
292               if test -f "$GIT_DIR/TMP_ALT"
293               then
294                   resolve_alternates "$remote" <"$GIT_DIR/TMP_ALT" |
295                   while read alt
296                   do
297                       case "$alt" in 'bad alternate: '*) die "$alt";; esac
298                       echo >&2 "Getting alternate: $alt"
299                       rsync -av --ignore-existing --exclude info \
300                       "$alt" "$GIT_OBJECT_DIRECTORY/" || exit
301                   done
302                   rm -f "$GIT_DIR/TMP_ALT"
303               fi
304               rsync_slurped_objects=t
305           }
306           ;;
307       *)
308           # We will do git native transport with just one call later.
309           continue ;;
310       esac
311
312       append_fetch_head "$head" "$remote" \
313           "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
314
315   done
316
317   case "$remote" in
318   http://* | https://* | rsync://* )
319       ;; # we are already done.
320   *)
321     ( : subshell because we muck with IFS
322       IFS="     $LF"
323       (
324           git-fetch-pack $exec $keep --thin "$remote" $rref || echo failed "$remote"
325       ) |
326       while read sha1 remote_name
327       do
328           case "$sha1" in
329           failed)
330                   echo >&2 "Fetch failure: $remote"
331                   exit 1 ;;
332           esac
333           found=
334           single_force=
335           for ref in $refs
336           do
337               case "$ref" in
338               +$remote_name:*)
339                   single_force=t
340                   not_for_merge=
341                   found="$ref"
342                   break ;;
343               .+$remote_name:*)
344                   single_force=t
345                   not_for_merge=t
346                   found="$ref"
347                   break ;;
348               .$remote_name:*)
349                   not_for_merge=t
350                   found="$ref"
351                   break ;;
352               $remote_name:*)
353                   not_for_merge=
354                   found="$ref"
355                   break ;;
356               esac
357           done
358           local_name=$(expr "$found" : '[^:]*:\(.*\)')
359           append_fetch_head "$sha1" "$remote" \
360                   "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
361       done
362     ) || exit ;;
363   esac
364
365 }
366
367 fetch_main "$reflist"
368
369 # automated tag following
370 case "$no_tags$tags" in
371 '')
372         case "$reflist" in
373         *:refs/*)
374                 # effective only when we are following remote branch
375                 # using local tracking branch.
376                 taglist=$(IFS=" " &&
377                 git-ls-remote $upload_pack --tags "$remote" |
378                 sed -ne 's|^\([0-9a-f]*\)[      ]\(refs/tags/.*\)^{}$|\1 \2|p' |
379                 while read sha1 name
380                 do
381                         test -f "$GIT_DIR/$name" && continue
382                         git-check-ref-format "$name" || {
383                                 echo >&2 "warning: tag ${name} ignored"
384                                 continue
385                         }
386                         git-cat-file -t "$sha1" >/dev/null 2>&1 || continue
387                         echo >&2 "Auto-following $name"
388                         echo ".${name}:${name}"
389                 done)
390         esac
391         case "$taglist" in
392         '') ;;
393         ?*)
394                 fetch_main "$taglist" ;;
395         esac
396 esac
397
398 # If the original head was empty (i.e. no "master" yet), or
399 # if we were told not to worry, we do not have to check.
400 case ",$update_head_ok,$orig_head," in
401 *,, | t,* )
402         ;;
403 *)
404         curr_head=$(git-rev-parse --verify HEAD 2>/dev/null)
405         if test "$curr_head" != "$orig_head"
406         then
407                 git-update-ref HEAD "$orig_head"
408                 die "Cannot fetch into the current branch."
409         fi
410         ;;
411 esac