Update 'crlf' attribute semantics.
[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=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           git-fetch-pack --thin $exec $keep $shallow_depth \
181               $quiet $no_progress "$remote" $rref ||
182           echo failed "$remote"
183         fi
184       ) |
185       (
186         flags=
187         test -n "$verbose" && flags="$flags -v"
188         test -n "$force" && flags="$flags -f"
189         GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION" \
190                 git-fetch--tool $flags native-store \
191                         "$remote" "$remote_nick" "$refs"
192       )
193     ) || exit
194
195 }
196
197 fetch_per_ref () {
198   reflist="$1"
199   refs=
200   rref=
201
202   for ref in $reflist
203   do
204       refs="$refs$LF$ref"
205
206       # These are relative path from $GIT_DIR, typically starting at refs/
207       # but may be HEAD
208       if expr "z$ref" : 'z\.' >/dev/null
209       then
210           not_for_merge=t
211           ref=$(expr "z$ref" : 'z\.\(.*\)')
212       else
213           not_for_merge=
214       fi
215       if expr "z$ref" : 'z+' >/dev/null
216       then
217           single_force=t
218           ref=$(expr "z$ref" : 'z+\(.*\)')
219       else
220           single_force=
221       fi
222       remote_name=$(expr "z$ref" : 'z\([^:]*\):')
223       local_name=$(expr "z$ref" : 'z[^:]*:\(.*\)')
224
225       rref="$rref$LF$remote_name"
226
227       # There are transports that can fetch only one head at a time...
228       case "$remote" in
229       http://* | https://* | ftp://*)
230           test -n "$shallow_depth" &&
231                 die "shallow clone with http not supported"
232           proto=`expr "$remote" : '\([^:]*\):'`
233           if [ -n "$GIT_SSL_NO_VERIFY" ]; then
234               curl_extra_args="-k"
235           fi
236           if [ -n "$GIT_CURL_FTP_NO_EPSV" -o \
237                 "`git-config --bool http.noEPSV`" = true ]; then
238               noepsv_opt="--disable-epsv"
239           fi
240
241           # Find $remote_name from ls-remote output.
242           head=$(
243                 IFS='   '
244                 echo "$ls_remote_result" |
245                 while read sha1 name
246                 do
247                         test "z$name" = "z$remote_name" || continue
248                         echo "$sha1"
249                         break
250                 done
251           )
252           expr "z$head" : "z$_x40\$" >/dev/null ||
253                 die "No such ref $remote_name at $remote"
254           echo >&2 "Fetching $remote_name from $remote using $proto"
255           case "$quiet" in '') v=-v ;; *) v= ;; esac
256           git-http-fetch $v -a "$head" "$remote" || exit
257           ;;
258       rsync://*)
259           test -n "$shallow_depth" &&
260                 die "shallow clone with rsync not supported"
261           TMP_HEAD="$GIT_DIR/TMP_HEAD"
262           rsync -L -q "$remote/$remote_name" "$TMP_HEAD" || exit 1
263           head=$(git-rev-parse --verify TMP_HEAD)
264           rm -f "$TMP_HEAD"
265           case "$quiet" in '') v=-v ;; *) v= ;; esac
266           test "$rsync_slurped_objects" || {
267               rsync -a $v --ignore-existing --exclude info \
268                   "$remote/objects/" "$GIT_OBJECT_DIRECTORY/" || exit
269
270               # Look at objects/info/alternates for rsync -- http will
271               # support it natively and git native ones will do it on
272               # the remote end.  Not having that file is not a crime.
273               rsync -q "$remote/objects/info/alternates" \
274                   "$GIT_DIR/TMP_ALT" 2>/dev/null ||
275                   rm -f "$GIT_DIR/TMP_ALT"
276               if test -f "$GIT_DIR/TMP_ALT"
277               then
278                   resolve_alternates "$remote" <"$GIT_DIR/TMP_ALT" |
279                   while read alt
280                   do
281                       case "$alt" in 'bad alternate: '*) die "$alt";; esac
282                       echo >&2 "Getting alternate: $alt"
283                       rsync -av --ignore-existing --exclude info \
284                       "$alt" "$GIT_OBJECT_DIRECTORY/" || exit
285                   done
286                   rm -f "$GIT_DIR/TMP_ALT"
287               fi
288               rsync_slurped_objects=t
289           }
290           ;;
291       esac
292
293       append_fetch_head "$head" "$remote" \
294           "$remote_name" "$remote_nick" "$local_name" "$not_for_merge" || exit
295
296   done
297
298 }
299
300 fetch_main () {
301         case "$remote" in
302         http://* | https://* | ftp://* | rsync://* )
303                 fetch_per_ref "$@"
304                 ;;
305         *)
306                 fetch_all_at_once "$@"
307                 ;;
308         esac
309 }
310
311 fetch_main "$reflist" || exit
312
313 # automated tag following
314 case "$no_tags$tags" in
315 '')
316         case "$reflist" in
317         *:refs/*)
318                 # effective only when we are following remote branch
319                 # using local tracking branch.
320                 taglist=$(IFS=' ' &&
321                 echo "$ls_remote_result" |
322                 git-show-ref --exclude-existing=refs/tags/ |
323                 while read sha1 name
324                 do
325                         git-cat-file -t "$sha1" >/dev/null 2>&1 || continue
326                         echo >&2 "Auto-following $name"
327                         echo ".${name}:${name}"
328                 done)
329         esac
330         case "$taglist" in
331         '') ;;
332         ?*)
333                 # do not deepen a shallow tree when following tags
334                 shallow_depth=
335                 fetch_main "$taglist" || exit ;;
336         esac
337 esac
338
339 # If the original head was empty (i.e. no "master" yet), or
340 # if we were told not to worry, we do not have to check.
341 case "$orig_head" in
342 '')
343         ;;
344 ?*)
345         curr_head=$(git-rev-parse --verify HEAD 2>/dev/null)
346         if test "$curr_head" != "$orig_head"
347         then
348             git-update-ref \
349                         -m "$GIT_REFLOG_ACTION: Undoing incorrectly fetched HEAD." \
350                         HEAD "$orig_head"
351                 die "Cannot fetch into the current branch."
352         fi
353         ;;
354 esac