summaryrefslogtreecommitdiff
path: root/git-fetch.sh
blob: e44af2c86d8e7e44bc79aafcc8ccef3806804720 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
#!/bin/sh
#

USAGE='<fetch-options> <repository> <refspec>...'
SUBDIRECTORY_OK=Yes
. git-sh-setup
set_reflog_action "fetch $*"
cd_to_toplevel ;# probably unnecessary...

. git-parse-remote
_x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
_x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40"

LF='
'
IFS="$LF"

no_tags=
tags=
append=
force=
verbose=
update_head_ok=
exec=
keep=
shallow_depth=
no_progress=
test -t 1 || no_progress=--no-progress
quiet=
while test $# != 0
do
	case "$1" in
	-a|--a|--ap|--app|--appe|--appen|--append)
		append=t
		;;
	--upl|--uplo|--uploa|--upload|--upload-|--upload-p|\
	--upload-pa|--upload-pac|--upload-pack)
		shift
		exec="--upload-pack=$1"
		;;
	--upl=*|--uplo=*|--uploa=*|--upload=*|\
	--upload-=*|--upload-p=*|--upload-pa=*|--upload-pac=*|--upload-pack=*)
		exec=--upload-pack=$(expr "z$1" : 'z-[^=]*=\(.*\)')
		shift
		;;
	-f|--f|--fo|--for|--forc|--force)
		force=t
		;;
	-t|--t|--ta|--tag|--tags)
		tags=t
		;;
	-n|--n|--no|--no-|--no-t|--no-ta|--no-tag|--no-tags)
		no_tags=t
		;;
	-u|--u|--up|--upd|--upda|--updat|--update|--update-|--update-h|\
	--update-he|--update-hea|--update-head|--update-head-|\
	--update-head-o|--update-head-ok)
		update_head_ok=t
		;;
	-q|--q|--qu|--qui|--quie|--quiet)
		quiet=--quiet
		;;
	-v|--verbose)
		verbose="$verbose"Yes
		;;
	-k|--k|--ke|--kee|--keep)
		keep='-k -k'
		;;
	--depth=*)
		shallow_depth="--depth=`expr "z$1" : 'z-[^=]*=\(.*\)'`"
		;;
	--depth)
		shift
		shallow_depth="--depth=$1"
		;;
	-*)
		usage
		;;
	*)
		break
		;;
	esac
	shift
done

case "$#" in
0)
	origin=$(get_default_remote)
	test -n "$(get_remote_url ${origin})" ||
		die "Where do you want to fetch from today?"
	set x $origin ; shift ;;
esac

if test -z "$exec"
then
	# No command line override and we have configuration for the remote.
	exec="--upload-pack=$(get_uploadpack $1)"
fi

remote_nick="$1"
remote=$(get_remote_url "$@")
refs=
rref=
rsync_slurped_objects=

if test "" = "$append"
then
	: >"$GIT_DIR/FETCH_HEAD"
fi

# Global that is reused later
ls_remote_result=$(git ls-remote $exec "$remote") ||
	die "Cannot get the repository state from $remote"

append_fetch_head () {
	flags=
	test -n "$verbose" && flags="$flags$LF-v"
	test -n "$force$single_force" && flags="$flags$LF-f"
	GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION" \
		git fetch--tool $flags append-fetch-head "$@"
}

# updating the current HEAD with git-fetch in a bare
# repository is always fine.
if test -z "$update_head_ok" && test $(is_bare_repository) = false
then
	orig_head=$(git rev-parse --verify HEAD 2>/dev/null)
fi

# Allow --notags from remote.$1.tagopt
case "$tags$no_tags" in
'')
	case "$(git config --get "remote.$1.tagopt")" in
	--no-tags)
		no_tags=t ;;
	esac
esac

# If --tags (and later --heads or --all) is specified, then we are
# not talking about defaults stored in Pull: line of remotes or
# branches file, and just fetch those and refspecs explicitly given.
# Otherwise we do what we always did.

reflist=$(get_remote_refs_for_fetch "$@")
if test "$tags"
then
	taglist=`IFS='	' &&
		  echo "$ls_remote_result" |
		  git show-ref --exclude-existing=refs/tags/ |
	          while read sha1 name
		  do
			echo ".${name}:${name}"
		  done` || exit
	if test "$#" -gt 1
	then
		# remote URL plus explicit refspecs; we need to merge them.
		reflist="$reflist$LF$taglist"
	else
		# No explicit refspecs; fetch tags only.
		reflist=$taglist
	fi
fi

fetch_all_at_once () {

  eval=$(echo "$1" | git fetch--tool parse-reflist "-")
  eval "$eval"

    ( : subshell because we muck with IFS
      IFS=" 	$LF"
      (
	if test "$remote" = . ; then
	    git show-ref $rref || echo failed "$remote"
	elif test -f "$remote" ; then
	    test -n "$shallow_depth" &&
		die "shallow clone with bundle is not supported"
	    git bundle unbundle "$remote" $rref ||
	    echo failed "$remote"
	else
		if	test -d "$remote" &&

			# The remote might be our alternate.  With
			# this optimization we will bypass fetch-pack
			# altogether, which means we cannot be doing
			# the shallow stuff at all.
			test ! -f "$GIT_DIR/shallow" &&
			test -z "$shallow_depth" &&

			# See if all of what we are going to fetch are
			# connected to our repository's tips, in which
			# case we do not have to do any fetch.
			theirs=$(echo "$ls_remote_result" | \
				git fetch--tool -s pick-rref "$rref" "-") &&

			# This will barf when $theirs reach an object that
			# we do not have in our repository.  Otherwise,
			# we already have everything the fetch would bring in.
			git rev-list --objects $theirs --not --all \
				>/dev/null 2>/dev/null
		then
			echo "$ls_remote_result" | \
				git fetch--tool pick-rref "$rref" "-"
		else
			flags=
			case $verbose in
			YesYes*)
			    flags="-v"
			    ;;
			esac
			git-fetch-pack --thin $exec $keep $shallow_depth \
				$quiet $no_progress $flags "$remote" $rref ||
			echo failed "$remote"
		fi
	fi
      ) |
      (
	flags=
	test -n "$verbose" && flags="$flags -v"
	test -n "$force" && flags="$flags -f"
	GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION" \
		git fetch--tool $flags native-store \
			"$remote" "$remote_nick" "$refs"
      )
    ) || exit

}

fetch_per_ref () {
  reflist="$1"
  refs=
  rref=

  for ref in $reflist
  do
      refs="$refs$LF$ref"

      # These are relative path from $GIT_DIR, typically starting at refs/
      # but may be HEAD
      if expr "z$ref" : 'z\.' >/dev/null
      then
	  not_for_merge=t
	  ref=$(expr "z$ref" : 'z\.\(.*\)')
      else
	  not_for_merge=
      fi
      if expr "z$ref" : 'z+' >/dev/null
      then
	  single_force=t
	  ref=$(expr "z$ref" : 'z+\(.*\)')
      else
	  single_force=
      fi
      remote_name=$(expr "z$ref" : 'z\([^:]*\):')
      local_name=$(expr "z$ref" : 'z[^:]*:\(.*\)')

      rref="$rref$LF$remote_name"

      # There are transports that can fetch only one head at a time...
      case "$remote" in
      http://* | https://* | ftp://*)
	  test -n "$shallow_depth" &&
		die "shallow clone with http not supported"
	  proto=`expr "$remote" : '\([^:]*\):'`
	  if [ -n "$GIT_SSL_NO_VERIFY" ]; then
	      curl_extra_args="-k"
	  fi
	  if [ -n "$GIT_CURL_FTP_NO_EPSV" -o \
		"`git config --bool http.noEPSV`" = true ]; then
	      noepsv_opt="--disable-epsv"
	  fi

	  # Find $remote_name from ls-remote output.
	  head=$(echo "$ls_remote_result" | \
		git fetch--tool -s pick-rref "$remote_name" "-")
	  expr "z$head" : "z$_x40\$" >/dev/null ||
		die "No such ref $remote_name at $remote"
	  echo >&2 "Fetching $remote_name from $remote using $proto"
	  case "$quiet" in '') v=-v ;; *) v= ;; esac
	  git-http-fetch $v -a "$head" "$remote" || exit
	  ;;
      rsync://*)
	  test -n "$shallow_depth" &&
		die "shallow clone with rsync not supported"
	  TMP_HEAD="$GIT_DIR/TMP_HEAD"
	  rsync -L -q "$remote/$remote_name" "$TMP_HEAD" || exit 1
	  head=$(git rev-parse --verify TMP_HEAD)
	  rm -f "$TMP_HEAD"
	  case "$quiet" in '') v=-v ;; *) v= ;; esac
	  test "$rsync_slurped_objects" || {
	      rsync -a $v --ignore-existing --exclude info \
		  "$remote/objects/" "$GIT_OBJECT_DIRECTORY/" || exit

	      # Look at objects/info/alternates for rsync -- http will
	      # support it natively and git native ones will do it on
	      # the remote end.  Not having that file is not a crime.
	      rsync -q "$remote/objects/info/alternates" \
		  "$GIT_DIR/TMP_ALT" 2>/dev/null ||
		  rm -f "$GIT_DIR/TMP_ALT"
	      if test -f "$GIT_DIR/TMP_ALT"
	      then
		  resolve_alternates "$remote" <"$GIT_DIR/TMP_ALT" |
		  while read alt
		  do
		      case "$alt" in 'bad alternate: '*) die "$alt";; esac
		      echo >&2 "Getting alternate: $alt"
		      rsync -av --ignore-existing --exclude info \
		      "$alt" "$GIT_OBJECT_DIRECTORY/" || exit
		  done
		  rm -f "$GIT_DIR/TMP_ALT"
	      fi
	      rsync_slurped_objects=t
	  }
	  ;;
      esac

      append_fetch_head "$head" "$remote" \
	  "$remote_name" "$remote_nick" "$local_name" "$not_for_merge" || exit

  done

}

fetch_main () {
	case "$remote" in
	http://* | https://* | ftp://* | rsync://* )
		fetch_per_ref "$@"
		;;
	*)
		fetch_all_at_once "$@"
		;;
	esac
}

fetch_main "$reflist" || exit

# automated tag following
case "$no_tags$tags" in
'')
	case "$reflist" in
	*:refs/*)
		# effective only when we are following remote branch
		# using local tracking branch.
		taglist=$(IFS='	' &&
		echo "$ls_remote_result" |
		git show-ref --exclude-existing=refs/tags/ |
		while read sha1 name
		do
			git cat-file -t "$sha1" >/dev/null 2>&1 || continue
			echo >&2 "Auto-following $name"
			echo ".${name}:${name}"
		done)
	esac
	case "$taglist" in
	'') ;;
	?*)
		# do not deepen a shallow tree when following tags
		shallow_depth=
		fetch_main "$taglist" || exit ;;
	esac
esac

# If the original head was empty (i.e. no "master" yet), or
# if we were told not to worry, we do not have to check.
case "$orig_head" in
'')
	;;
?*)
	curr_head=$(git rev-parse --verify HEAD 2>/dev/null)
	if test "$curr_head" != "$orig_head"
	then
	    git update-ref \
			-m "$GIT_REFLOG_ACTION: Undoing incorrectly fetched HEAD." \
			HEAD "$orig_head"
		die "Cannot fetch into the current branch."
	fi
	;;
esac