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git-commit-vandalism/git-fetch.sh
Shawn O. Pearce f94741324e Use GIT_REFLOG_ACTION environment variable instead. 
Junio rightly pointed out that the --reflog-action parameter
was starting to get out of control, as most porcelain code
needed to hand it to other porcelain and plumbing alike to
ensure the reflog contained the top-level user action and
not the lower-level actions it invoked.

At Junio's suggestion we are introducing the new set_reflog_action
function to all shell scripts, allowing them to declare early on
what their default reflog name should be, but this setting only
takes effect if the caller has not already set the GIT_REFLOG_ACTION
environment variable.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-12-28 01:05:15 -08:00

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#!/bin/sh
#
USAGE='<fetch-options> <repository> <refspec>...'
SUBDIRECTORY_OK=Yes
. git-sh-setup
set_reflog_action "fetch $*"
TOP=$(git-rev-parse --show-cdup)
if test ! -z "$TOP"
then
cd "$TOP"
fi
. 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="$LF"
no_tags=
tags=
append=
force=
verbose=
update_head_ok=
exec=
upload_pack=
keep=
while case "$#" in 0) break ;; esac
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="--exec=$1"
upload_pack="-u $1"
;;
-f|--f|--fo|--for|--forc|--force)
force=t
;;
-t|--t|--ta|--tag|--tags)
tags=t
;;
-n|--n|--no|--no-|--no-t|--no-ta|--no-tag|--no-tags)
no_tags=t
;;
-u|--u|--up|--upd|--upda|--updat|--update|--update-|--update-h|\
--update-he|--update-hea|--update-head|--update-head-|\
--update-head-o|--update-head-ok)
update_head_ok=t
;;
-v|--verbose)
verbose=Yes
;;
-k|--k|--ke|--kee|--keep)
keep='-k -k'
;;
-*)
usage
;;
*)
break
;;
esac
shift
done
case "$#" 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
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 $upload_pack "$remote") ||
die "Cannot get the repository state from $remote"
append_fetch_head () {
head_="$1"
remote_="$2"
remote_name_="$3"
remote_nick_="$4"
local_name_="$5"
case "$6" in
t) not_for_merge_='not-for-merge' ;;
'') not_for_merge_= ;;
esac
# remote-nick is the URL given on the command line (or a shorthand)
# remote-name is the $GIT_DIR relative refs/ path we computed
# for this refspec.
# the $note_ variable will be fed to git-fmt-merge-msg for further
# processing.
case "$remote_name_" in
HEAD)
note_= ;;
refs/heads/*)
note_="$(expr "$remote_name_" : 'refs/heads/\(.*\)')"
note_="branch '$note_' of " ;;
refs/tags/*)
note_="$(expr "$remote_name_" : 'refs/tags/\(.*\)')"
note_="tag '$note_' of " ;;
refs/remotes/*)
note_="$(expr "$remote_name_" : 'refs/remotes/\(.*\)')"
note_="remote branch '$note_' of " ;;
*)
note_="$remote_name of " ;;
esac
remote_1_=$(expr "z$remote_" : 'z\(.*\)\.git/*$') &&
remote_="$remote_1_"
note_="$note_$remote_"
# 2.6.11-tree tag would not be happy to be fed to resolve.
if git-cat-file commit "$head_" >/dev/null 2>&1
then
headc_=$(git-rev-parse --verify "$head_^0") || exit
echo "$headc_ $not_for_merge_ $note_" >>"$GIT_DIR/FETCH_HEAD"
else
echo "$head_ not-for-merge $note_" >>"$GIT_DIR/FETCH_HEAD"
fi
update_local_ref "$local_name_" "$head_" "$note_"
}
update_local_ref () {
# If we are storing the head locally make sure that it is
# a fast forward (aka "reverse push").
label_=$(git-cat-file -t $2)
newshort_=$(git-rev-parse --short $2)
if test -z "$1" ; then
[ "$verbose" ] && echo >&2 "* fetched $3"
[ "$verbose" ] && echo >&2 " $label_: $newshort_"
return 0
fi
oldshort_=$(git show-ref --hash --abbrev "$1" 2>/dev/null)
case "$1" in
refs/tags/*)
# Tags need not be pointing at commits so there
# is no way to guarantee "fast-forward" anyway.
if test -n "$oldshort_"
then
if now_=$(git show-ref --hash "$1") && test "$now_" = "$2"
then
[ "$verbose" ] && echo >&2 "* $1: same as $3"
[ "$verbose" ] && echo >&2 " $label_: $newshort_" ||:
else
echo >&2 "* $1: updating with $3"
echo >&2 " $label_: $newshort_"
git-update-ref -m "$GIT_REFLOG_ACTION: updating tag" "$1" "$2"
fi
else
echo >&2 "* $1: storing $3"
echo >&2 " $label_: $newshort_"
git-update-ref -m "$GIT_REFLOG_ACTION: storing tag" "$1" "$2"
fi
;;
refs/heads/* | refs/remotes/*)
# $1 is the ref being updated.
# $2 is the new value for the ref.
local=$(git-rev-parse --verify "$1^0" 2>/dev/null)
if test "$local"
then
# Require fast-forward.
mb=$(git-merge-base "$local" "$2") &&
case "$2,$mb" in
$local,*)
if test -n "$verbose"
then
echo >&2 "* $1: same as $3"
echo >&2 " $label_: $newshort_"
fi
;;
*,$local)
echo >&2 "* $1: fast forward to $3"
echo >&2 " old..new: $oldshort_..$newshort_"
git-update-ref -m "$GIT_REFLOG_ACTION: fast-forward" "$1" "$2" "$local"
;;
*)
false
;;
esac || {
case ",$force,$single_force," in
*,t,*)
echo >&2 "* $1: forcing update to non-fast forward $3"
echo >&2 " old...new: $oldshort_...$newshort_"
git-update-ref -m "$GIT_REFLOG_ACTION: forced-update" "$1" "$2" "$local"
;;
*)
echo >&2 "* $1: not updating to non-fast forward $3"
echo >&2 " old...new: $oldshort_...$newshort_"
exit 1
;;
esac
}
else
echo >&2 "* $1: storing $3"
echo >&2 " $label_: $newshort_"
git-update-ref -m "$GIT_REFLOG_ACTION: storing head" "$1" "$2"
fi
;;
esac
}
case "$update_head_ok" in
'')
orig_head=$(git-rev-parse --verify HEAD 2>/dev/null)
;;
esac
# If --tags (and later --heads or --all) is specified, then we are
# not talking about defaults stored in Pull: line of remotes or
# branches file, and just fetch those and refspecs explicitly given.
# Otherwise we do what we always did.
reflist=$(get_remote_refs_for_fetch "$@")
if test "$tags"
then
taglist=`IFS=' ' &&
echo "$ls_remote_result" |
while read sha1 name
do
case "$sha1" in
fail)
exit 1
esac
case "$name" in
*^*) continue ;;
refs/tags/*) ;;
*) continue ;;
esac
if git-check-ref-format "$name"
then
echo ".${name}:${name}"
else
echo >&2 "warning: tag ${name} ignored"
fi
done` || exit
if test "$#" -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_main () {
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://*)
proto=`expr "$remote" : '\([^:]*\):'`
if [ -n "$GIT_SSL_NO_VERIFY" ]; then
curl_extra_args="-k"
fi
if [ -n "$GIT_CURL_FTP_NO_EPSV" -o \
"`git-repo-config --bool http.noEPSV`" = true ]; then
noepsv_opt="--disable-epsv"
fi
# Find $remote_name from ls-remote output.
head=$(
IFS=' '
echo "$ls_remote_result" |
while read sha1 name
do
test "z$name" = "z$remote_name" || continue
echo "$sha1"
break
done
)
expr "z$head" : "z$_x40\$" >/dev/null ||
die "No such ref $remote_name at $remote"
echo >&2 "Fetching $remote_name from $remote using $proto"
git-http-fetch -v -a "$head" "$remote/" || exit
;;
rsync://*)
TMP_HEAD="$GIT_DIR/TMP_HEAD"
rsync -L -q "$remote/$remote_name" "$TMP_HEAD" || exit 1
head=$(git-rev-parse --verify TMP_HEAD)
rm -f "$TMP_HEAD"
test "$rsync_slurped_objects" || {
rsync -av --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
}
;;
*)
# We will do git native transport with just one call later.
continue ;;
esac
append_fetch_head "$head" "$remote" \
"$remote_name" "$remote_nick" "$local_name" "$not_for_merge" || exit
done
case "$remote" in
http://* | https://* | ftp://* | rsync://* )
;; # we are already done.
*)
( : subshell because we muck with IFS
pack_lockfile=
IFS=" $LF"
(
git-fetch-pack --thin $exec $keep "$remote" $rref || echo failed "$remote"
) |
while read sha1 remote_name
do
case "$sha1" in
failed)
echo >&2 "Fetch failure: $remote"
exit 1 ;;
# special line coming from index-pack with the pack name
pack)
continue ;;
keep)
pack_lockfile="$GIT_OBJECT_DIRECTORY/pack/pack-$remote_name.keep"
continue ;;
esac
found=
single_force=
for ref in $refs
do
case "$ref" in
+$remote_name:*)
single_force=t
not_for_merge=
found="$ref"
break ;;
.+$remote_name:*)
single_force=t
not_for_merge=t
found="$ref"
break ;;
.$remote_name:*)
not_for_merge=t
found="$ref"
break ;;
$remote_name:*)
not_for_merge=
found="$ref"
break ;;
esac
done
local_name=$(expr "z$found" : 'z[^:]*:\(.*\)')
append_fetch_head "$sha1" "$remote" \
"$remote_name" "$remote_nick" "$local_name" \
"$not_for_merge" || exit
done &&
if [ "$pack_lockfile" ]; then rm -f "$pack_lockfile"; fi
) || exit ;;
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
'') ;;
?*)
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
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