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