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filter-branch: stop special-casing $filter_subdir argument

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Handling $filter_subdir in the usual way requires a separate case at
every use, because the variable is empty when unused.

Furthermore, --subdirectory-filter supplies its own '--', and if the user
provided one himself, such as in

  git filter-branch --subdirectory-filter subdir -- --all -- subdir/file

	an extra '--' was used as path filter in the call to git-rev-list that
determines the commits that shall be rewritten.

To keep the argument handling sane, we filter $@ to contain only the
non-revision arguments, and store all revisions in $ref_args.  The
$ref_args are easy to handle since only the SHA1s are needed; the
actual branch names have already been stored in $tempdir/heads at this
point.

An extra separating -- is only required if the user did not provide
any non-revision arguments, as the latter disambiguate the
$filter_subdir following after them (or fail earlier because they are
ambiguous themselves).

Thanks to Johannes Sixt for suggesting this solution.

Signed-off-by: Thomas Rast <trast@student.ethz.ch>
Signed-off-by: Johannes Sixt <j6t@kdbg.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Thomas Rast 2009-11-11 09:53:46 +01:00 committed by Junio C Hamano
parent 78d553b7d7
commit 2c1d2d8188
1 changed files with 15 additions and 7 deletions
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22
git-filter-branch.sh
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@ -257,15 +257,24 @@ git read-tree || die "Could not seed the index"
# map old->new commit ids for rewriting parents
mkdir ../map || die "Could not create map/ directory"
# we need "--" only if there are no path arguments in $@
nonrevs=$(git rev-parse --no-revs "$@") || exit
test -z "$nonrevs" && dashdash=-- || dashdash=
rev_args=$(git rev-parse --revs-only "$@")
case "$filter_subdir" in
"")
git rev-list --reverse --topo-order --default HEAD \
--parents --simplify-merges "$@"
eval set -- "$(git rev-parse --sq --no-revs "$@")"
;;
*)
git rev-list --reverse --topo-order --default HEAD \
--parents --simplify-merges "$@" -- "$filter_subdir"
esac > ../revs || die "Could not get the commits"
eval set -- "$(git rev-parse --sq --no-revs "$@" $dashdash \
"$filter_subdir")"
;;
esac
git rev-list --reverse --topo-order --default HEAD \
--parents --simplify-merges $rev_args "$@" > ../revs ||
die "Could not get the commits"
commits=$(wc -l <../revs | tr -d " ")
test $commits -eq 0 && die "Found nothing to rewrite"
@ -356,8 +365,7 @@ then
do
sha1=$(git rev-parse "$ref"^0)
test -f "$workdir"/../map/$sha1 && continue
ancestor=$(git rev-list --simplify-merges -1 \
$ref -- "$filter_subdir")
ancestor=$(git rev-list --simplify-merges -1 "$ref" "$@")
test "$ancestor" && echo $(map $ancestor) >> "$workdir"/../map/$sha1
done < "$tempdir"/heads
fi