Allow git-svnimport to take "" as the trunk directory.
[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 $*"
8 cd_to_toplevel ;# probably unnecessary...
9
10 . git-parse-remote
11 _x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
12 _x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40"
13
14 LF='
15 '
16 IFS="$LF"
17
18 no_tags=
19 tags=
20 append=
21 force=
22 verbose=
23 update_head_ok=
24 exec=
25 keep=
26 shallow_depth=
27 no_progress=
28 test -t 1 || no_progress=--no-progress
29 quiet=
30 while case "$#" in 0) break ;; esac
31 do
32         case "$1" in
33         -a|--a|--ap|--app|--appe|--appen|--append)
34                 append=t
35                 ;;
36         --upl|--uplo|--uploa|--upload|--upload-|--upload-p|\
37         --upload-pa|--upload-pac|--upload-pack)
38                 shift
39                 exec="--upload-pack=$1"
40                 ;;
41         --upl=*|--uplo=*|--uploa=*|--upload=*|\
42         --upload-=*|--upload-p=*|--upload-pa=*|--upload-pac=*|--upload-pack=*)
43                 exec=--upload-pack=$(expr "z$1" : 'z-[^=]*=\(.*\)')
44                 shift
45                 ;;
46         -f|--f|--fo|--for|--forc|--force)
47                 force=t
48                 ;;
49         -t|--t|--ta|--tag|--tags)
50                 tags=t
51                 ;;
52         -n|--n|--no|--no-|--no-t|--no-ta|--no-tag|--no-tags)
53                 no_tags=t
54                 ;;
55         -u|--u|--up|--upd|--upda|--updat|--update|--update-|--update-h|\
56         --update-he|--update-hea|--update-head|--update-head-|\
57         --update-head-o|--update-head-ok)
58                 update_head_ok=t
59                 ;;
60         -q|--q|--qu|--qui|--quie|--quiet)
61                 quiet=--quiet
62                 ;;
63         -v|--verbose)
64                 verbose="$verbose"Yes
65                 ;;
66         -k|--k|--ke|--kee|--keep)
67                 keep='-k -k'
68                 ;;
69         --depth=*)
70                 shallow_depth="--depth=`expr "z$1" : 'z-[^=]*=\(.*\)'`"
71                 ;;
72         --depth)
73                 shift
74                 shallow_depth="--depth=$1"
75                 ;;
76         -*)
77                 usage
78                 ;;
79         *)
80                 break
81                 ;;
82         esac
83         shift
84 done
85
86 case "$#" in
87 0)
88         origin=$(get_default_remote)
89         test -n "$(get_remote_url ${origin})" ||
90                 die "Where do you want to fetch from today?"
91         set x $origin ; shift ;;
92 esac
93
94 if test -z "$exec"
95 then
96         # No command line override and we have configuration for the remote.
97         exec="--upload-pack=$(get_uploadpack $1)"
98 fi
99
100 remote_nick="$1"
101 remote=$(get_remote_url "$@")
102 refs=
103 rref=
104 rsync_slurped_objects=
105
106 if test "" = "$append"
107 then
108         : >"$GIT_DIR/FETCH_HEAD"
109 fi
110
111 # Global that is reused later
112 ls_remote_result=$(git ls-remote $exec "$remote") ||
113         die "Cannot get the repository state from $remote"
114
115 append_fetch_head () {
116         flags=
117         test -n "$verbose" && flags="$flags$LF-v"
118         test -n "$force$single_force" && flags="$flags$LF-f"
119         GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION" \
120                 git fetch--tool $flags append-fetch-head "$@"
121 }
122
123 # updating the current HEAD with git-fetch in a bare
124 # repository is always fine.
125 if test -z "$update_head_ok" && test $(is_bare_repository) = false
126 then
127         orig_head=$(git rev-parse --verify HEAD 2>/dev/null)
128 fi
129
130 # Allow --notags from remote.$1.tagopt
131 case "$tags$no_tags" in
132 '')
133         case "$(git config --get "remote.$1.tagopt")" in
134         --no-tags)
135                 no_tags=t ;;
136         esac
137 esac
138
139 # If --tags (and later --heads or --all) is specified, then we are
140 # not talking about defaults stored in Pull: line of remotes or
141 # branches file, and just fetch those and refspecs explicitly given.
142 # Otherwise we do what we always did.
143
144 reflist=$(get_remote_refs_for_fetch "$@")
145 if test "$tags"
146 then
147         taglist=`IFS='  ' &&
148                   echo "$ls_remote_result" |
149                   git show-ref --exclude-existing=refs/tags/ |
150                   while read sha1 name
151                   do
152                         echo ".${name}:${name}"
153                   done` || exit
154         if test "$#" -gt 1
155         then
156                 # remote URL plus explicit refspecs; we need to merge them.
157                 reflist="$reflist$LF$taglist"
158         else
159                 # No explicit refspecs; fetch tags only.
160                 reflist=$taglist
161         fi
162 fi
163
164 fetch_all_at_once () {
165
166   eval=$(echo "$1" | git fetch--tool parse-reflist "-")
167   eval "$eval"
168
169     ( : subshell because we muck with IFS
170       IFS="     $LF"
171       (
172         if test "$remote" = . ; then
173             git show-ref $rref || echo failed "$remote"
174         elif test -f "$remote" ; then
175             test -n "$shallow_depth" &&
176                 die "shallow clone with bundle is not supported"
177             git bundle unbundle "$remote" $rref ||
178             echo failed "$remote"
179         else
180                 if      test -d "$remote" &&
181
182                         # The remote might be our alternate.  With
183                         # this optimization we will bypass fetch-pack
184                         # altogether, which means we cannot be doing
185                         # the shallow stuff at all.
186                         test ! -f "$GIT_DIR/shallow" &&
187                         test -z "$shallow_depth" &&
188
189                         # See if all of what we are going to fetch are
190                         # connected to our repository's tips, in which
191                         # case we do not have to do any fetch.
192                         theirs=$(echo "$ls_remote_result" | \
193                                 git fetch--tool -s pick-rref "$rref" "-") &&
194
195                         # This will barf when $theirs reach an object that
196                         # we do not have in our repository.  Otherwise,
197                         # we already have everything the fetch would bring in.
198                         git rev-list --objects $theirs --not --all \
199                                 >/dev/null 2>/dev/null
200                 then
201                         echo "$ls_remote_result" | \
202                                 git fetch--tool pick-rref "$rref" "-"
203                 else
204                         flags=
205                         case $verbose in
206                         YesYes*)
207                             flags="-v"
208                             ;;
209                         esac
210                         git-fetch-pack --thin $exec $keep $shallow_depth \
211                                 $quiet $no_progress $flags "$remote" $rref ||
212                         echo failed "$remote"
213                 fi
214         fi
215       ) |
216       (
217         flags=
218         test -n "$verbose" && flags="$flags -v"
219         test -n "$force" && flags="$flags -f"
220         GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION" \
221                 git fetch--tool $flags native-store \
222                         "$remote" "$remote_nick" "$refs"
223       )
224     ) || exit
225
226 }
227
228 fetch_per_ref () {
229   reflist="$1"
230   refs=
231   rref=
232
233   for ref in $reflist
234   do
235       refs="$refs$LF$ref"
236
237       # These are relative path from $GIT_DIR, typically starting at refs/
238       # but may be HEAD
239       if expr "z$ref" : 'z\.' >/dev/null
240       then
241           not_for_merge=t
242           ref=$(expr "z$ref" : 'z\.\(.*\)')
243       else
244           not_for_merge=
245       fi
246       if expr "z$ref" : 'z+' >/dev/null
247       then
248           single_force=t
249           ref=$(expr "z$ref" : 'z+\(.*\)')
250       else
251           single_force=
252       fi
253       remote_name=$(expr "z$ref" : 'z\([^:]*\):')
254       local_name=$(expr "z$ref" : 'z[^:]*:\(.*\)')
255
256       rref="$rref$LF$remote_name"
257
258       # There are transports that can fetch only one head at a time...
259       case "$remote" in
260       http://* | https://* | ftp://*)
261           test -n "$shallow_depth" &&
262                 die "shallow clone with http not supported"
263           proto=`expr "$remote" : '\([^:]*\):'`
264           if [ -n "$GIT_SSL_NO_VERIFY" ]; then
265               curl_extra_args="-k"
266           fi
267           if [ -n "$GIT_CURL_FTP_NO_EPSV" -o \
268                 "`git config --bool http.noEPSV`" = true ]; then
269               noepsv_opt="--disable-epsv"
270           fi
271
272           # Find $remote_name from ls-remote output.
273           head=$(echo "$ls_remote_result" | \
274                 git fetch--tool -s pick-rref "$remote_name" "-")
275           expr "z$head" : "z$_x40\$" >/dev/null ||
276                 die "No such ref $remote_name at $remote"
277           echo >&2 "Fetching $remote_name from $remote using $proto"
278           case "$quiet" in '') v=-v ;; *) v= ;; esac
279           git-http-fetch $v -a "$head" "$remote" || exit
280           ;;
281       rsync://*)
282           test -n "$shallow_depth" &&
283                 die "shallow clone with rsync not supported"
284           TMP_HEAD="$GIT_DIR/TMP_HEAD"
285           rsync -L -q "$remote/$remote_name" "$TMP_HEAD" || exit 1
286           head=$(git rev-parse --verify TMP_HEAD)
287           rm -f "$TMP_HEAD"
288           case "$quiet" in '') v=-v ;; *) v= ;; esac
289           test "$rsync_slurped_objects" || {
290               rsync -a $v --ignore-existing --exclude info \
291                   "$remote/objects/" "$GIT_OBJECT_DIRECTORY/" || exit
292
293               # Look at objects/info/alternates for rsync -- http will
294               # support it natively and git native ones will do it on
295               # the remote end.  Not having that file is not a crime.
296               rsync -q "$remote/objects/info/alternates" \
297                   "$GIT_DIR/TMP_ALT" 2>/dev/null ||
298                   rm -f "$GIT_DIR/TMP_ALT"
299               if test -f "$GIT_DIR/TMP_ALT"
300               then
301                   resolve_alternates "$remote" <"$GIT_DIR/TMP_ALT" |
302                   while read alt
303                   do
304                       case "$alt" in 'bad alternate: '*) die "$alt";; esac
305                       echo >&2 "Getting alternate: $alt"
306                       rsync -av --ignore-existing --exclude info \
307                       "$alt" "$GIT_OBJECT_DIRECTORY/" || exit
308                   done
309                   rm -f "$GIT_DIR/TMP_ALT"
310               fi
311               rsync_slurped_objects=t
312           }
313           ;;
314       esac
315
316       append_fetch_head "$head" "$remote" \
317           "$remote_name" "$remote_nick" "$local_name" "$not_for_merge" || exit
318
319   done
320
321 }
322
323 fetch_main () {
324         case "$remote" in
325         http://* | https://* | ftp://* | rsync://* )
326                 fetch_per_ref "$@"
327                 ;;
328         *)
329                 fetch_all_at_once "$@"
330                 ;;
331         esac
332 }
333
334 fetch_main "$reflist" || exit
335
336 # automated tag following
337 case "$no_tags$tags" in
338 '')
339         case "$reflist" in
340         *:refs/*)
341                 # effective only when we are following remote branch
342                 # using local tracking branch.
343                 taglist=$(IFS=' ' &&
344                 echo "$ls_remote_result" |
345                 git show-ref --exclude-existing=refs/tags/ |
346                 while read sha1 name
347                 do
348                         git cat-file -t "$sha1" >/dev/null 2>&1 || continue
349                         echo >&2 "Auto-following $name"
350                         echo ".${name}:${name}"
351                 done)
352         esac
353         case "$taglist" in
354         '') ;;
355         ?*)
356                 # do not deepen a shallow tree when following tags
357                 shallow_depth=
358                 fetch_main "$taglist" || exit ;;
359         esac
360 esac
361
362 # If the original head was empty (i.e. no "master" yet), or
363 # if we were told not to worry, we do not have to check.
364 case "$orig_head" in
365 '')
366         ;;
367 ?*)
368         curr_head=$(git rev-parse --verify HEAD 2>/dev/null)
369         if test "$curr_head" != "$orig_head"
370         then
371             git update-ref \
372                         -m "$GIT_REFLOG_ACTION: Undoing incorrectly fetched HEAD." \
373                         HEAD "$orig_head"
374                 die "Cannot fetch into the current branch."
375         fi
376         ;;
377 esac