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