466fe59e35e03a6f9955f78e4238d9e0a60b8dc0
[git/git.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 $*"
8
9 TOP=$(git-rev-parse --show-cdup)
10 if test ! -z "$TOP"
11 then
12 cd "$TOP"
13 fi
14 . git-parse-remote
15 _x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
16 _x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40"
17
18 LF='
19 '
20 IFS="$LF"
21
22 no_tags=
23 tags=
24 append=
25 force=
26 verbose=
27 update_head_ok=
28 exec=
29 upload_pack=
30 keep=
31 shallow_depth=
32 while case "$#" in 0) break ;; esac
33 do
34 case "$1" in
35 -a|--a|--ap|--app|--appe|--appen|--append)
36 append=t
37 ;;
38 --upl|--uplo|--uploa|--upload|--upload-|--upload-p|\
39 --upload-pa|--upload-pac|--upload-pack)
40 shift
41 exec="--exec=$1"
42 upload_pack="-u $1"
43 ;;
44 -f|--f|--fo|--for|--forc|--force)
45 force=t
46 ;;
47 -t|--t|--ta|--tag|--tags)
48 tags=t
49 ;;
50 -n|--n|--no|--no-|--no-t|--no-ta|--no-tag|--no-tags)
51 no_tags=t
52 ;;
53 -u|--u|--up|--upd|--upda|--updat|--update|--update-|--update-h|\
54 --update-he|--update-hea|--update-head|--update-head-|\
55 --update-head-o|--update-head-ok)
56 update_head_ok=t
57 ;;
58 -v|--verbose)
59 verbose=Yes
60 ;;
61 -k|--k|--ke|--kee|--keep)
62 keep='-k -k'
63 ;;
64 --depth=*)
65 shallow_depth="--depth=`expr "z$1" : 'z-[^=]*=\(.*\)'`"
66 ;;
67 --depth)
68 shift
69 shallow_depth="--depth=$1"
70 ;;
71 -*)
72 usage
73 ;;
74 *)
75 break
76 ;;
77 esac
78 shift
79 done
80
81 case "$#" in
82 0)
83 origin=$(get_default_remote)
84 test -n "$(get_remote_url ${origin})" ||
85 die "Where do you want to fetch from today?"
86 set x $origin ; shift ;;
87 esac
88
89 remote_nick="$1"
90 remote=$(get_remote_url "$@")
91 refs=
92 rref=
93 rsync_slurped_objects=
94
95 if test "" = "$append"
96 then
97 : >"$GIT_DIR/FETCH_HEAD"
98 fi
99
100 # Global that is reused later
101 ls_remote_result=$(git ls-remote $upload_pack "$remote") ||
102 die "Cannot get the repository state from $remote"
103
104 append_fetch_head () {
105 head_="$1"
106 remote_="$2"
107 remote_name_="$3"
108 remote_nick_="$4"
109 local_name_="$5"
110 case "$6" in
111 t) not_for_merge_='not-for-merge' ;;
112 '') not_for_merge_= ;;
113 esac
114
115 # remote-nick is the URL given on the command line (or a shorthand)
116 # remote-name is the $GIT_DIR relative refs/ path we computed
117 # for this refspec.
118
119 # the $note_ variable will be fed to git-fmt-merge-msg for further
120 # processing.
121 case "$remote_name_" in
122 HEAD)
123 note_= ;;
124 refs/heads/*)
125 note_="$(expr "$remote_name_" : 'refs/heads/\(.*\)')"
126 note_="branch '$note_' of " ;;
127 refs/tags/*)
128 note_="$(expr "$remote_name_" : 'refs/tags/\(.*\)')"
129 note_="tag '$note_' of " ;;
130 refs/remotes/*)
131 note_="$(expr "$remote_name_" : 'refs/remotes/\(.*\)')"
132 note_="remote branch '$note_' of " ;;
133 *)
134 note_="$remote_name of " ;;
135 esac
136 remote_1_=$(expr "z$remote_" : 'z\(.*\)\.git/*$') &&
137 remote_="$remote_1_"
138 note_="$note_$remote_"
139
140 # 2.6.11-tree tag would not be happy to be fed to resolve.
141 if git-cat-file commit "$head_" >/dev/null 2>&1
142 then
143 headc_=$(git-rev-parse --verify "$head_^0") || exit
144 echo "$headc_ $not_for_merge_ $note_" >>"$GIT_DIR/FETCH_HEAD"
145 else
146 echo "$head_ not-for-merge $note_" >>"$GIT_DIR/FETCH_HEAD"
147 fi
148
149 update_local_ref "$local_name_" "$head_" "$note_"
150 }
151
152 update_local_ref () {
153 # If we are storing the head locally make sure that it is
154 # a fast forward (aka "reverse push").
155
156 label_=$(git-cat-file -t $2)
157 newshort_=$(git-rev-parse --short $2)
158 if test -z "$1" ; then
159 [ "$verbose" ] && echo >&2 "* fetched $3"
160 [ "$verbose" ] && echo >&2 " $label_: $newshort_"
161 return 0
162 fi
163 oldshort_=$(git show-ref --hash --abbrev "$1" 2>/dev/null)
164
165 case "$1" in
166 refs/tags/*)
167 # Tags need not be pointing at commits so there
168 # is no way to guarantee "fast-forward" anyway.
169 if test -n "$oldshort_"
170 then
171 if now_=$(git show-ref --hash "$1") && test "$now_" = "$2"
172 then
173 [ "$verbose" ] && echo >&2 "* $1: same as $3"
174 [ "$verbose" ] && echo >&2 " $label_: $newshort_" ||:
175 else
176 echo >&2 "* $1: updating with $3"
177 echo >&2 " $label_: $newshort_"
178 git-update-ref -m "$GIT_REFLOG_ACTION: updating tag" "$1" "$2"
179 fi
180 else
181 echo >&2 "* $1: storing $3"
182 echo >&2 " $label_: $newshort_"
183 git-update-ref -m "$GIT_REFLOG_ACTION: storing tag" "$1" "$2"
184 fi
185 ;;
186
187 refs/heads/* | refs/remotes/*)
188 # $1 is the ref being updated.
189 # $2 is the new value for the ref.
190 local=$(git-rev-parse --verify "$1^0" 2>/dev/null)
191 if test "$local"
192 then
193 # Require fast-forward.
194 mb=$(git-merge-base "$local" "$2") &&
195 case "$2,$mb" in
196 $local,*)
197 if test -n "$verbose"
198 then
199 echo >&2 "* $1: same as $3"
200 echo >&2 " $label_: $newshort_"
201 fi
202 ;;
203 *,$local)
204 echo >&2 "* $1: fast forward to $3"
205 echo >&2 " old..new: $oldshort_..$newshort_"
206 git-update-ref -m "$GIT_REFLOG_ACTION: fast-forward" "$1" "$2" "$local"
207 ;;
208 *)
209 false
210 ;;
211 esac || {
212 case ",$force,$single_force," in
213 *,t,*)
214 echo >&2 "* $1: forcing update to non-fast forward $3"
215 echo >&2 " old...new: $oldshort_...$newshort_"
216 git-update-ref -m "$GIT_REFLOG_ACTION: forced-update" "$1" "$2" "$local"
217 ;;
218 *)
219 echo >&2 "* $1: not updating to non-fast forward $3"
220 echo >&2 " old...new: $oldshort_...$newshort_"
221 exit 1
222 ;;
223 esac
224 }
225 else
226 echo >&2 "* $1: storing $3"
227 echo >&2 " $label_: $newshort_"
228 git-update-ref -m "$GIT_REFLOG_ACTION: storing head" "$1" "$2"
229 fi
230 ;;
231 esac
232 }
233
234 case "$update_head_ok" in
235 '')
236 orig_head=$(git-rev-parse --verify HEAD 2>/dev/null)
237 ;;
238 esac
239
240 # If --tags (and later --heads or --all) is specified, then we are
241 # not talking about defaults stored in Pull: line of remotes or
242 # branches file, and just fetch those and refspecs explicitly given.
243 # Otherwise we do what we always did.
244
245 reflist=$(get_remote_refs_for_fetch "$@")
246 if test "$tags"
247 then
248 taglist=`IFS=' ' &&
249 echo "$ls_remote_result" |
250 while read sha1 name
251 do
252 case "$sha1" in
253 fail)
254 exit 1
255 esac
256 case "$name" in
257 *^*) continue ;;
258 refs/tags/*) ;;
259 *) continue ;;
260 esac
261 if git-check-ref-format "$name"
262 then
263 echo ".${name}:${name}"
264 else
265 echo >&2 "warning: tag ${name} ignored"
266 fi
267 done` || exit
268 if test "$#" -gt 1
269 then
270 # remote URL plus explicit refspecs; we need to merge them.
271 reflist="$reflist$LF$taglist"
272 else
273 # No explicit refspecs; fetch tags only.
274 reflist=$taglist
275 fi
276 fi
277
278 fetch_main () {
279 reflist="$1"
280 refs=
281 rref=
282
283 for ref in $reflist
284 do
285 refs="$refs$LF$ref"
286
287 # These are relative path from $GIT_DIR, typically starting at refs/
288 # but may be HEAD
289 if expr "z$ref" : 'z\.' >/dev/null
290 then
291 not_for_merge=t
292 ref=$(expr "z$ref" : 'z\.\(.*\)')
293 else
294 not_for_merge=
295 fi
296 if expr "z$ref" : 'z+' >/dev/null
297 then
298 single_force=t
299 ref=$(expr "z$ref" : 'z+\(.*\)')
300 else
301 single_force=
302 fi
303 remote_name=$(expr "z$ref" : 'z\([^:]*\):')
304 local_name=$(expr "z$ref" : 'z[^:]*:\(.*\)')
305
306 rref="$rref$LF$remote_name"
307
308 # There are transports that can fetch only one head at a time...
309 case "$remote" in
310 http://* | https://* | ftp://*)
311 test -n "$shallow_depth" &&
312 die "shallow clone with http not supported"
313 proto=`expr "$remote" : '\([^:]*\):'`
314 if [ -n "$GIT_SSL_NO_VERIFY" ]; then
315 curl_extra_args="-k"
316 fi
317 if [ -n "$GIT_CURL_FTP_NO_EPSV" -o \
318 "`git-repo-config --bool http.noEPSV`" = true ]; then
319 noepsv_opt="--disable-epsv"
320 fi
321
322 # Find $remote_name from ls-remote output.
323 head=$(
324 IFS=' '
325 echo "$ls_remote_result" |
326 while read sha1 name
327 do
328 test "z$name" = "z$remote_name" || continue
329 echo "$sha1"
330 break
331 done
332 )
333 expr "z$head" : "z$_x40\$" >/dev/null ||
334 die "No such ref $remote_name at $remote"
335 echo >&2 "Fetching $remote_name from $remote using $proto"
336 git-http-fetch -v -a "$head" "$remote/" || exit
337 ;;
338 rsync://*)
339 test -n "$shallow_depth" &&
340 die "shallow clone with rsync not supported"
341 TMP_HEAD="$GIT_DIR/TMP_HEAD"
342 rsync -L -q "$remote/$remote_name" "$TMP_HEAD" || exit 1
343 head=$(git-rev-parse --verify TMP_HEAD)
344 rm -f "$TMP_HEAD"
345 test "$rsync_slurped_objects" || {
346 rsync -av --ignore-existing --exclude info \
347 "$remote/objects/" "$GIT_OBJECT_DIRECTORY/" || exit
348
349 # Look at objects/info/alternates for rsync -- http will
350 # support it natively and git native ones will do it on
351 # the remote end. Not having that file is not a crime.
352 rsync -q "$remote/objects/info/alternates" \
353 "$GIT_DIR/TMP_ALT" 2>/dev/null ||
354 rm -f "$GIT_DIR/TMP_ALT"
355 if test -f "$GIT_DIR/TMP_ALT"
356 then
357 resolve_alternates "$remote" <"$GIT_DIR/TMP_ALT" |
358 while read alt
359 do
360 case "$alt" in 'bad alternate: '*) die "$alt";; esac
361 echo >&2 "Getting alternate: $alt"
362 rsync -av --ignore-existing --exclude info \
363 "$alt" "$GIT_OBJECT_DIRECTORY/" || exit
364 done
365 rm -f "$GIT_DIR/TMP_ALT"
366 fi
367 rsync_slurped_objects=t
368 }
369 ;;
370 *)
371 # We will do git native transport with just one call later.
372 continue ;;
373 esac
374
375 append_fetch_head "$head" "$remote" \
376 "$remote_name" "$remote_nick" "$local_name" "$not_for_merge" || exit
377
378 done
379
380 case "$remote" in
381 http://* | https://* | ftp://* | rsync://* )
382 ;; # we are already done.
383 *)
384 ( : subshell because we muck with IFS
385 IFS=" $LF"
386 (
387 git-fetch-pack --thin $exec $keep $shallow_depth "$remote" $rref ||
388 echo failed "$remote"
389 ) |
390 (
391 trap '
392 if test -n "$keepfile" && test -f "$keepfile"
393 then
394 rm -f "$keepfile"
395 fi
396 ' 0
397
398 keepfile=
399 while read sha1 remote_name
400 do
401 case "$sha1" in
402 failed)
403 echo >&2 "Fetch failure: $remote"
404 exit 1 ;;
405 # special line coming from index-pack with the pack name
406 pack)
407 continue ;;
408 keep)
409 keepfile="$GIT_OBJECT_DIRECTORY/pack/pack-$remote_name.keep"
410 continue ;;
411 esac
412 found=
413 single_force=
414 for ref in $refs
415 do
416 case "$ref" in
417 +$remote_name:*)
418 single_force=t
419 not_for_merge=
420 found="$ref"
421 break ;;
422 .+$remote_name:*)
423 single_force=t
424 not_for_merge=t
425 found="$ref"
426 break ;;
427 .$remote_name:*)
428 not_for_merge=t
429 found="$ref"
430 break ;;
431 $remote_name:*)
432 not_for_merge=
433 found="$ref"
434 break ;;
435 esac
436 done
437 local_name=$(expr "z$found" : 'z[^:]*:\(.*\)')
438 append_fetch_head "$sha1" "$remote" \
439 "$remote_name" "$remote_nick" "$local_name" \
440 "$not_for_merge" || exit
441 done
442 )
443 ) || exit ;;
444 esac
445
446 }
447
448 fetch_main "$reflist" || exit
449
450 # automated tag following
451 case "$no_tags$tags" in
452 '')
453 case "$reflist" in
454 *:refs/*)
455 # effective only when we are following remote branch
456 # using local tracking branch.
457 taglist=$(IFS=' ' &&
458 echo "$ls_remote_result" |
459 git-show-ref --exclude-existing=refs/tags/ |
460 while read sha1 name
461 do
462 git-cat-file -t "$sha1" >/dev/null 2>&1 || continue
463 echo >&2 "Auto-following $name"
464 echo ".${name}:${name}"
465 done)
466 esac
467 case "$taglist" in
468 '') ;;
469 ?*)
470 # do not deepen a shallow tree when following tags
471 shallow_depth=
472 fetch_main "$taglist" || exit ;;
473 esac
474 esac
475
476 # If the original head was empty (i.e. no "master" yet), or
477 # if we were told not to worry, we do not have to check.
478 case "$orig_head" in
479 '')
480 ;;
481 ?*)
482 curr_head=$(git-rev-parse --verify HEAD 2>/dev/null)
483 if test "$curr_head" != "$orig_head"
484 then
485 git-update-ref \
486 -m "$GIT_REFLOG_ACTION: Undoing incorrectly fetched HEAD." \
487 HEAD "$orig_head"
488 die "Cannot fetch into the current branch."
489 fi
490 ;;
491 esac