Re: [TopGit PATCH] hooks/pre-commit: check for cycles in dependencies
On Thu, Jun 4, 2009 at 22:41, Bert Wesarg <bert.wesarg@googlemail.com> wrote:
Show 52 quoted lines
> Only newly added dependencies needs to be considered. For each of these deps
> check if there is a path from this dep to the current HEAD.
>
> Use recursive_dep() for this task. Even if recursive_dep() uses a DFS-like
> traversal it will not run into an infty-loop if there would be a cycle, because
> recursive_dep() takes .topdeps only from committed trees. And it is required
> that the committed dependency graph is acyclic.
>
> Signed-off-by: Bert Wesarg <bert.wesarg@googlemail.com>
>
> ---
> hooks/pre-commit.sh | 30 ++++++++++++++++++++++++++++--
> 1 files changed, 28 insertions(+), 2 deletions(-)
>
> diff --git a/hooks/pre-commit.sh b/hooks/pre-commit.sh
> index 9d677e9..8e05a4e 100644
> --- a/hooks/pre-commit.sh
> +++ b/hooks/pre-commit.sh
> @@ -20,7 +20,8 @@ tg_util
> if head_=$(git symbolic-ref -q HEAD); then
> case "$head_" in
> refs/heads/*)
> - git rev-parse -q --verify "refs/top-bases${head_#refs/heads}" >/dev/null || exit 0;;
> + head_="${head_#refs/heads/}"
> + git rev-parse -q --verify "refs/top-bases/$head_" >/dev/null || exit 0;;
> *)
> exit 0;;
> esac
> @@ -35,4 +36,29 @@ fi
> [ -s "$root_dir/.topmsg" ] ||
> die ".topmsg is missing"
>
> -# TODO: Verify .topdeps for valid branch names and against cycles
> +check_cycle_name()
> +{
> + [ "$head_" != "$_dep" ] ||
> + die "TopGit dependencies form a cycle: perpetrator is $_name"
> +}
> +
> +# only check newly added deps
> +# check if a path exists to the current HEAD
> +git diff --cached "$root_dir/.topdeps" |
> + awk '
> +BEGIN { in_hunk = 0; }
> +/^@@ / { in_hunk = 1; }
> +/^\+/ { if (in_hunk == 1) printf("%s\n", substr($0, 2)); }
> +/^[^@ +-]/ { in_hunk = 0; }
> +' |
> + while read newly_added; do
> + # deps can be non-tgish but we can't run recurse_deps() on them
> + ref_exists "refs/top-bases/$newly_added" ||
> + continueI think we need also a test to check against self-loops, i.e.:
[ "$head_" != "$newly_added" ] ||
die "Can't have myself as dep"Can you please squash this in.
Show 10 quoted lines
> + # recurse_deps uses dfs but takes the .topdeps from the tree,
> + # therefor no infty-loop in the cycle-check
> + no_remotes=1 recurse_deps check_cycle_name "$newly_added"
> + done
> +
> +
> +# TODO: Verify .topdeps for valid branch names
> --
> tg: (99f2ef6..) bw/check-for-dep-cycle (depends on: master)
>
Bert Wesarg <bert.wesarg@googlemail.com>