Merge early parts of branch 'np/pack'
[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         [ "$verbose" ] && echo >&2 "* committish: $head_"
133         [ "$verbose" ] && echo >&2 "  $note_"
134     else
135         echo "$head_    not-for-merge   $note_" >>"$GIT_DIR/FETCH_HEAD"
136         [ "$verbose" ] && echo >&2 "* non-commit: $head_"
137         [ "$verbose" ] && echo >&2 "  $note_"
138     fi
139     if test "$local_name_" != ""
140     then
141         # We are storing the head locally.  Make sure that it is
142         # a fast forward (aka "reverse push").
143         fast_forward_local "$local_name_" "$head_" "$note_"
144     fi
145 }
146
147 fast_forward_local () {
148     mkdir -p "$(dirname "$GIT_DIR/$1")"
149     case "$1" in
150     refs/tags/*)
151         # Tags need not be pointing at commits so there
152         # is no way to guarantee "fast-forward" anyway.
153         if test -f "$GIT_DIR/$1"
154         then
155                 if now_=$(cat "$GIT_DIR/$1") && test "$now_" = "$2"
156                 then
157                         [ "$verbose" ] && echo >&2 "* $1: same as $3" ||:
158                 else
159                         echo >&2 "* $1: updating with $3"
160                         git-update-ref -m "$rloga: updating tag" "$1" "$2"
161                 fi
162         else
163                 echo >&2 "* $1: storing $3"
164                 git-update-ref -m "$rloga: storing tag" "$1" "$2"
165         fi
166         ;;
167
168     refs/heads/* | refs/remotes/*)
169         # $1 is the ref being updated.
170         # $2 is the new value for the ref.
171         local=$(git-rev-parse --verify "$1^0" 2>/dev/null)
172         if test "$local"
173         then
174             # Require fast-forward.
175             mb=$(git-merge-base "$local" "$2") &&
176             case "$2,$mb" in
177             $local,*)
178                 if test -n "$verbose"
179                 then
180                         echo >&2 "* $1: same as $3"
181                 fi
182                 ;;
183             *,$local)
184                 echo >&2 "* $1: fast forward to $3"
185                 echo >&2 "  from $local to $2"
186                 git-update-ref -m "$rloga: fast-forward" "$1" "$2" "$local"
187                 ;;
188             *)
189                 false
190                 ;;
191             esac || {
192                 echo >&2 "* $1: does not fast forward to $3;"
193                 case ",$force,$single_force," in
194                 *,t,*)
195                         echo >&2 "  forcing update."
196                         git-update-ref -m "$rloga: forced-update" "$1" "$2" "$local"
197                         ;;
198                 *)
199                         echo >&2 "  not updating."
200                         exit 1
201                         ;;
202                 esac
203             }
204         else
205             echo >&2 "* $1: storing $3"
206             git-update-ref -m "$rloga: storing head" "$1" "$2"
207         fi
208         ;;
209     esac
210 }
211
212 case "$update_head_ok" in
213 '')
214         orig_head=$(git-rev-parse --verify HEAD 2>/dev/null)
215         ;;
216 esac
217
218 # If --tags (and later --heads or --all) is specified, then we are
219 # not talking about defaults stored in Pull: line of remotes or
220 # branches file, and just fetch those and refspecs explicitly given.
221 # Otherwise we do what we always did.
222
223 reflist=$(get_remote_refs_for_fetch "$@")
224 if test "$tags"
225 then
226         taglist=`IFS="  " &&
227                   (
228                         git-ls-remote $upload_pack --tags "$remote" ||
229                         echo fail ouch
230                   ) |
231                   while read sha1 name
232                   do
233                         case "$sha1" in
234                         fail)
235                                 exit 1
236                         esac
237                         case "$name" in
238                         *^*) continue ;;
239                         esac
240                         if git-check-ref-format "$name"
241                         then
242                             echo ".${name}:${name}"
243                         else
244                             echo >&2 "warning: tag ${name} ignored"
245                         fi
246                   done` || exit
247         if test "$#" -gt 1
248         then
249                 # remote URL plus explicit refspecs; we need to merge them.
250                 reflist="$reflist$LF$taglist"
251         else
252                 # No explicit refspecs; fetch tags only.
253                 reflist=$taglist
254         fi
255 fi
256
257 fetch_main () {
258   reflist="$1"
259   refs=
260
261   for ref in $reflist
262   do
263       refs="$refs$LF$ref"
264
265       # These are relative path from $GIT_DIR, typically starting at refs/
266       # but may be HEAD
267       if expr "z$ref" : 'z\.' >/dev/null
268       then
269           not_for_merge=t
270           ref=$(expr "z$ref" : 'z\.\(.*\)')
271       else
272           not_for_merge=
273       fi
274       if expr "z$ref" : 'z+' >/dev/null
275       then
276           single_force=t
277           ref=$(expr "z$ref" : 'z+\(.*\)')
278       else
279           single_force=
280       fi
281       remote_name=$(expr "z$ref" : 'z\([^:]*\):')
282       local_name=$(expr "z$ref" : 'z[^:]*:\(.*\)')
283
284       rref="$rref$LF$remote_name"
285
286       # There are transports that can fetch only one head at a time...
287       case "$remote" in
288       http://* | https://* | ftp://*)
289           if [ -n "$GIT_SSL_NO_VERIFY" ]; then
290               curl_extra_args="-k"
291           fi
292           max_depth=5
293           depth=0
294           head="ref: $remote_name"
295           while (expr "z$head" : "zref:" && expr $depth \< $max_depth) >/dev/null
296           do
297             remote_name_quoted=$(@@PERL@@ -e '
298               my $u = $ARGV[0];
299               $u =~ s/^ref:\s*//;
300               $u =~ s{([^-a-zA-Z0-9/.])}{sprintf"%%%02x",ord($1)}eg;
301               print "$u";
302           ' "$head")
303             head=$(curl -nsfL $curl_extra_args "$remote/$remote_name_quoted")
304             depth=$( expr \( $depth + 1 \) )
305           done
306           expr "z$head" : "z$_x40\$" >/dev/null ||
307               die "Failed to fetch $remote_name from $remote"
308           echo >&2 Fetching "$remote_name from $remote" using http
309           git-http-fetch -v -a "$head" "$remote/" || exit
310           ;;
311       rsync://*)
312           TMP_HEAD="$GIT_DIR/TMP_HEAD"
313           rsync -L -q "$remote/$remote_name" "$TMP_HEAD" || exit 1
314           head=$(git-rev-parse --verify TMP_HEAD)
315           rm -f "$TMP_HEAD"
316           test "$rsync_slurped_objects" || {
317               rsync -av --ignore-existing --exclude info \
318                   "$remote/objects/" "$GIT_OBJECT_DIRECTORY/" || exit
319
320               # Look at objects/info/alternates for rsync -- http will
321               # support it natively and git native ones will do it on
322               # the remote end.  Not having that file is not a crime.
323               rsync -q "$remote/objects/info/alternates" \
324                   "$GIT_DIR/TMP_ALT" 2>/dev/null ||
325                   rm -f "$GIT_DIR/TMP_ALT"
326               if test -f "$GIT_DIR/TMP_ALT"
327               then
328                   resolve_alternates "$remote" <"$GIT_DIR/TMP_ALT" |
329                   while read alt
330                   do
331                       case "$alt" in 'bad alternate: '*) die "$alt";; esac
332                       echo >&2 "Getting alternate: $alt"
333                       rsync -av --ignore-existing --exclude info \
334                       "$alt" "$GIT_OBJECT_DIRECTORY/" || exit
335                   done
336                   rm -f "$GIT_DIR/TMP_ALT"
337               fi
338               rsync_slurped_objects=t
339           }
340           ;;
341       *)
342           # We will do git native transport with just one call later.
343           continue ;;
344       esac
345
346       append_fetch_head "$head" "$remote" \
347           "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
348
349   done
350
351   case "$remote" in
352   http://* | https://* | ftp://* | rsync://* )
353       ;; # we are already done.
354   *)
355     ( : subshell because we muck with IFS
356       IFS="     $LF"
357       (
358           git-fetch-pack $exec $keep "$remote" $rref || echo failed "$remote"
359       ) |
360       while read sha1 remote_name
361       do
362           case "$sha1" in
363           failed)
364                   echo >&2 "Fetch failure: $remote"
365                   exit 1 ;;
366           esac
367           found=
368           single_force=
369           for ref in $refs
370           do
371               case "$ref" in
372               +$remote_name:*)
373                   single_force=t
374                   not_for_merge=
375                   found="$ref"
376                   break ;;
377               .+$remote_name:*)
378                   single_force=t
379                   not_for_merge=t
380                   found="$ref"
381                   break ;;
382               .$remote_name:*)
383                   not_for_merge=t
384                   found="$ref"
385                   break ;;
386               $remote_name:*)
387                   not_for_merge=
388                   found="$ref"
389                   break ;;
390               esac
391           done
392           local_name=$(expr "z$found" : 'z[^:]*:\(.*\)')
393           append_fetch_head "$sha1" "$remote" \
394                   "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
395       done
396     ) || exit ;;
397   esac
398
399 }
400
401 fetch_main "$reflist"
402
403 # automated tag following
404 case "$no_tags$tags" in
405 '')
406         case "$reflist" in
407         *:refs/*)
408                 # effective only when we are following remote branch
409                 # using local tracking branch.
410                 taglist=$(IFS=" " &&
411                 git-ls-remote $upload_pack --tags "$remote" |
412                 sed -ne 's|^\([0-9a-f]*\)[      ]\(refs/tags/.*\)^{}$|\1 \2|p' |
413                 while read sha1 name
414                 do
415                         test -f "$GIT_DIR/$name" && continue
416                         git-check-ref-format "$name" || {
417                                 echo >&2 "warning: tag ${name} ignored"
418                                 continue
419                         }
420                         git-cat-file -t "$sha1" >/dev/null 2>&1 || continue
421                         echo >&2 "Auto-following $name"
422                         echo ".${name}:${name}"
423                 done)
424         esac
425         case "$taglist" in
426         '') ;;
427         ?*)
428                 fetch_main "$taglist" ;;
429         esac
430 esac
431
432 # If the original head was empty (i.e. no "master" yet), or
433 # if we were told not to worry, we do not have to check.
434 case ",$update_head_ok,$orig_head," in
435 *,, | t,* )
436         ;;
437 *)
438         curr_head=$(git-rev-parse --verify HEAD 2>/dev/null)
439         if test "$curr_head" != "$orig_head"
440         then
441             git-update-ref \
442                         -m "$rloga: Undoing incorrectly fetched HEAD." \
443                         HEAD "$orig_head"
444                 die "Cannot fetch into the current branch."
445         fi
446         ;;
447 esac