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