contrib/examples/git-fetch.sh - jrn/git - Git at Google

 #!/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 --tags/--notags from remote.$1.tagopt
 case "$tags$no_tags" in
 '')
 	case "$(git config --get "remote.$1.tagopt")" in
 	--tags)
 		tags=t ;;
 	--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
	#!/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 --tags/--notags from remote.$1.tagopt
	case "$tags$no_tags" in
	'')
	case "$(git config --get "remote.$1.tagopt")" in
	--tags)
	tags=t ;;
	--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