Even when overwriting tags, report if they are changed or not.
[git/git.git] / git-fetch.sh
1 #!/bin/sh
2 #
3 . git-sh-setup || die "Not a git archive"
4 . git-parse-remote
5 _x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
6 _x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40"
7
8 LF='
9 '
10 IFS="$LF"
11
12 tags=
13 append=
14 force=
15 update_head_ok=
16 while case "$#" in 0) break ;; esac
17 do
18 case "$1" in
19 -a|--a|--ap|--app|--appe|--appen|--append)
20 append=t
21 ;;
22 -f|--f|--fo|--for|--forc|--force)
23 force=t
24 ;;
25 -t|--t|--ta|--tag|--tags)
26 tags=t
27 ;;
28 -u|--u|--up|--upd|--upda|--updat|--update|--update-|--update-h|\
29 --update-he|--update-hea|--update-head|--update-head-|\
30 --update-head-o|--update-head-ok)
31 update_head_ok=t
32 ;;
33 *)
34 break
35 ;;
36 esac
37 shift
38 done
39
40 case "$#" in
41 0)
42 test -f "$GIT_DIR/branches/origin" ||
43 test -f "$GIT_DIR/remotes/origin" ||
44 die "Where do you want to fetch from today?"
45 set origin ;;
46 esac
47
48 remote_nick="$1"
49 remote=$(get_remote_url "$@")
50 refs=
51 rref=
52 rsync_slurped_objects=
53
54 if test "" = "$append"
55 then
56 : >"$GIT_DIR/FETCH_HEAD"
57 fi
58
59 append_fetch_head () {
60 head_="$1"
61 remote_="$2"
62 remote_name_="$3"
63 remote_nick_="$4"
64 local_name_="$5"
65 case "$6" in
66 t) not_for_merge_='not-for-merge' ;;
67 '') not_for_merge_= ;;
68 esac
69
70 # remote-nick is the URL given on the command line (or a shorthand)
71 # remote-name is the $GIT_DIR relative refs/ path we computed
72 # for this refspec.
73 case "$remote_name_" in
74 HEAD)
75 note_= ;;
76 refs/heads/*)
77 note_="$(expr "$remote_name_" : 'refs/heads/\(.*\)')"
78 note_="branch '$note_' of " ;;
79 refs/tags/*)
80 note_="$(expr "$remote_name_" : 'refs/tags/\(.*\)')"
81 note_="tag '$note_' of " ;;
82 *)
83 note_="$remote_name of " ;;
84 esac
85 remote_1_=$(expr "$remote_" : '\(.*\)\.git/*$') &&
86 remote_="$remote_1_"
87 note_="$note_$remote_"
88
89 # 2.6.11-tree tag would not be happy to be fed to resolve.
90 if git-cat-file commit "$head_" >/dev/null 2>&1
91 then
92 headc_=$(git-rev-parse --verify "$head_^0") || exit
93 echo "$headc_ $not_for_merge_ $note_" >>"$GIT_DIR/FETCH_HEAD"
94 echo >&2 "* committish: $head_"
95 echo >&2 " $note_"
96 else
97 echo "$head_ not-for-merge $note_" >>"$GIT_DIR/FETCH_HEAD"
98 echo >&2 "* non-commit: $head_"
99 echo >&2 " $note_"
100 fi
101 if test "$local_name_" != ""
102 then
103 # We are storing the head locally. Make sure that it is
104 # a fast forward (aka "reverse push").
105 fast_forward_local "$local_name_" "$head_" "$note_"
106 fi
107 }
108
109 fast_forward_local () {
110 mkdir -p "$(dirname "$GIT_DIR/$1")"
111 case "$1" in
112 refs/tags/*)
113 # Tags need not be pointing at commits so there
114 # is no way to guarantee "fast-forward" anyway.
115 if test -f "$GIT_DIR/$1"
116 then
117 if now_=$(cat "$GIT_DIR/$1") && test "$now_" = "$2"
118 then
119 echo >&2 "* $1: same as $3"
120 else
121 echo >&2 "* $1: updating with $3"
122 fi
123 else
124 echo >&2 "* $1: storing $3"
125 fi
126 git-update-ref "$1" "$2"
127 ;;
128
129 refs/heads/*)
130 # $1 is the ref being updated.
131 # $2 is the new value for the ref.
132 local=$(git-rev-parse --verify "$1^0" 2>/dev/null)
133 if test "$local"
134 then
135 # Require fast-forward.
136 mb=$(git-merge-base "$local" "$2") &&
137 case "$2,$mb" in
138 $local,*)
139 echo >&2 "* $1: same as $3"
140 ;;
141 *,$local)
142 echo >&2 "* $1: fast forward to $3"
143 git-update-ref "$1" "$2" "$local"
144 ;;
145 *)
146 false
147 ;;
148 esac || {
149 echo >&2 "* $1: does not fast forward to $3;"
150 case ",$force,$single_force," in
151 *,t,*)
152 echo >&2 " forcing update."
153 git-update-ref "$1" "$2" "$local"
154 ;;
155 *)
156 echo >&2 " not updating."
157 ;;
158 esac
159 }
160 else
161 echo >&2 "* $1: storing $3"
162 git-update-ref "$1" "$2"
163 fi
164 ;;
165 esac
166 }
167
168 case "$update_head_ok" in
169 '')
170 orig_head=$(git-rev-parse --verify HEAD 2>/dev/null)
171 ;;
172 esac
173
174 # If --tags (and later --heads or --all) is specified, then we are
175 # not talking about defaults stored in Pull: line of remotes or
176 # branches file, and just fetch those and refspecs explicitly given.
177 # Otherwise we do what we always did.
178
179 reflist=$(get_remote_refs_for_fetch "$@")
180 if test "$tags"
181 then
182 taglist=$(git-ls-remote --tags "$remote" |
183 sed -e '
184 /\^/d
185 s/^[^ ]* //
186 s/.*/&:&/')
187 if test "$#" -gt 1
188 then
189 # remote URL plus explicit refspecs; we need to merge them.
190 reflist="$reflist$LF$taglist"
191 else
192 # No explicit refspecs; fetch tags only.
193 reflist=$taglist
194 fi
195 fi
196
197 for ref in $reflist
198 do
199 refs="$refs$LF$ref"
200
201 # These are relative path from $GIT_DIR, typically starting at refs/
202 # but may be HEAD
203 if expr "$ref" : '\.' >/dev/null
204 then
205 not_for_merge=t
206 ref=$(expr "$ref" : '\.\(.*\)')
207 else
208 not_for_merge=
209 fi
210 if expr "$ref" : '\+' >/dev/null
211 then
212 single_force=t
213 ref=$(expr "$ref" : '\+\(.*\)')
214 else
215 single_force=
216 fi
217 remote_name=$(expr "$ref" : '\([^:]*\):')
218 local_name=$(expr "$ref" : '[^:]*:\(.*\)')
219
220 rref="$rref$LF$remote_name"
221
222 # There are transports that can fetch only one head at a time...
223 case "$remote" in
224 http://* | https://*)
225 if [ -n "$GIT_SSL_NO_VERIFY" ]; then
226 curl_extra_args="-k"
227 fi
228 remote_name_quoted=$(perl -e '
229 my $u = $ARGV[0];
230 $u =~ s{([^-a-zA-Z0-9/.])}{sprintf"%%%02x",ord($1)}eg;
231 print "$u";
232 ' "$remote_name")
233 head=$(curl -nsf $curl_extra_args "$remote/$remote_name_quoted") &&
234 expr "$head" : "$_x40\$" >/dev/null ||
235 die "Failed to fetch $remote_name from $remote"
236 echo >&2 Fetching "$remote_name from $remote" using http
237 git-http-fetch -v -a "$head" "$remote/" || exit
238 ;;
239 rsync://*)
240 TMP_HEAD="$GIT_DIR/TMP_HEAD"
241 rsync -L -q "$remote/$remote_name" "$TMP_HEAD" || exit 1
242 head=$(git-rev-parse --verify TMP_HEAD)
243 rm -f "$TMP_HEAD"
244 test "$rsync_slurped_objects" || {
245 rsync -av --ignore-existing --exclude info \
246 "$remote/objects/" "$GIT_OBJECT_DIRECTORY/" || exit
247
248 # Look at objects/info/alternates for rsync -- http will
249 # support it natively and git native ones will do it on the remote
250 # end. Not having that file is not a crime.
251 rsync -q "$remote/objects/info/alternates" \
252 "$GIT_DIR/TMP_ALT" 2>/dev/null ||
253 rm -f "$GIT_DIR/TMP_ALT"
254 if test -f "$GIT_DIR/TMP_ALT"
255 then
256 resolve_alternates "$remote" <"$GIT_DIR/TMP_ALT" |
257 while read alt
258 do
259 case "$alt" in 'bad alternate: '*) die "$alt";; esac
260 echo >&2 "Getting alternate: $alt"
261 rsync -av --ignore-existing --exclude info \
262 "$alt" "$GIT_OBJECT_DIRECTORY/" || exit
263 done
264 rm -f "$GIT_DIR/TMP_ALT"
265 fi
266 rsync_slurped_objects=t
267 }
268 ;;
269 *)
270 # We will do git native transport with just one call later.
271 continue ;;
272 esac
273
274 append_fetch_head "$head" "$remote" \
275 "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
276
277 done
278
279 case "$remote" in
280 http://* | https://* | rsync://* )
281 ;; # we are already done.
282 *)
283 IFS=" $LF"
284 (
285 git-fetch-pack "$remote" $rref || echo failed "$remote"
286 ) |
287 while read sha1 remote_name
288 do
289 case "$sha1" in
290 failed)
291 echo >&2 "Fetch failure: $remote"
292 exit 1 ;;
293 esac
294 found=
295 single_force=
296 for ref in $refs
297 do
298 case "$ref" in
299 +$remote_name:*)
300 single_force=t
301 not_for_merge=
302 found="$ref"
303 break ;;
304 .+$remote_name:*)
305 single_force=t
306 not_for_merge=t
307 found="$ref"
308 break ;;
309 .$remote_name:*)
310 not_for_merge=t
311 found="$ref"
312 break ;;
313 $remote_name:*)
314 not_for_merge=
315 found="$ref"
316 break ;;
317 esac
318 done
319 local_name=$(expr "$found" : '[^:]*:\(.*\)')
320 append_fetch_head "$sha1" "$remote" \
321 "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
322 done || exit
323 ;;
324 esac
325
326 # If the original head was empty (i.e. no "master" yet), or
327 # if we were told not to worry, we do not have to check.
328 case ",$update_head_ok,$orig_head," in
329 *,, | t,* )
330 ;;
331 *)
332 curr_head=$(git-rev-parse --verify HEAD 2>/dev/null)
333 if test "$curr_head" != "$orig_head"
334 then
335 git-update-ref HEAD "$orig_head"
336 die "Cannot fetch into the current branch."
337 fi
338 ;;
339 esac