Manzur Mukhitdinov <manzurmm@xxxxxxxxx> writes:
> When object is replaced with itself git shows unhelpful messages like(git log):
> "fatal: replace depth too high for object <SHA1>"
>
> Prevents user from replacing object with itself(with test for checking
> this case).
>
> Signed-off-by: Manzur Mukhitdinov <manzurmm@xxxxxxxxx>
> ---
The patch is not wrong per-se, but I wonder how useful this "do not
replace itself but all other forms of loops are not checked at all"
would be in practice. If your user did this:
git replace A B ;# pretend as if what is in B is in A
git replace B C ;# pretend as if what is in C is in B
git replace C A ;# pretend as if we have loop
git log C
she would not be helped with this patch at all, no?
We have the "replace depth" thing, which is a poor-man's substitute
for loop detection, primarily because we do not want to incur high
cost of loop detection at runtime. Shouldn't we be doing at least
the same amount of loop-avoidance check, if we really want to avoid
triggering the "replace depth" check at runtime?
> builtin/replace.c | 8 +++-----
> t/t6050-replace.sh | 11 +++++++++--
> 2 files changed, 12 insertions(+), 7 deletions(-)
>
> diff --git a/builtin/replace.c b/builtin/replace.c
> index 294b61b..628377a 100644
> --- a/builtin/replace.c
> +++ b/builtin/replace.c
> @@ -157,6 +157,9 @@ static int replace_object_sha1(const char *object_ref,
> char ref[PATH_MAX];
> struct ref_lock *lock;
>
> + if (!hashcmp(object, repl))
> + return error("new object is the same as the old one: '%s'", sha1_to_hex(object));
> +
> obj_type = sha1_object_info(object, NULL);
> repl_type = sha1_object_info(repl, NULL);
> if (!force && obj_type != repl_type)
> @@ -295,9 +298,6 @@ static int edit_and_replace(const char *object_ref, int force, int raw)
>
> free(tmpfile);
>
> - if (!hashcmp(old, new))
> - return error("new object is the same as the old one: '%s'", sha1_to_hex(old));
> -
> return replace_object_sha1(object_ref, old, "replacement", new, force);
> }
>
> @@ -406,8 +406,6 @@ static int create_graft(int argc, const char **argv, int force)
>
> strbuf_release(&buf);
>
> - if (!hashcmp(old, new))
> - return error("new commit is the same as the old one: '%s'", sha1_to_hex(old));
>
> return replace_object_sha1(old_ref, old, "replacement", new, force);
> }
> diff --git a/t/t6050-replace.sh b/t/t6050-replace.sh
> index 4d5a25e..5f96374 100755
> --- a/t/t6050-replace.sh
> +++ b/t/t6050-replace.sh
> @@ -369,9 +369,8 @@ test_expect_success '--edit with and without already replaced object' '
> git cat-file commit "$PARA3" | grep "A fake Thor"
> '
>
> -test_expect_success '--edit and change nothing or command failed' '
> +test_expect_success '--edit with failed editor' '
> git replace -d "$PARA3" &&
> - test_must_fail env GIT_EDITOR=true git replace --edit "$PARA3" &&
> test_must_fail env GIT_EDITOR="./fakeeditor;false" git replace --edit "$PARA3" &&
> GIT_EDITOR=./fakeeditor git replace --edit "$PARA3" &&
> git replace -l | grep "$PARA3" &&
> @@ -440,4 +439,12 @@ test_expect_success GPG '--graft on a commit with a mergetag' '
> git replace -d $HASH10
> '
>
> +test_expect_success 'replacing object with itself must fail' '
> + test_must_fail git replace $HASH1 $HASH1 &&
> + HASH8=$(git rev-parse --verify HEAD) &&
> + test_must_fail git replace HEAD $HASH8 &&
> + test_must_fail git replace --graft HEAD HEAD^ &&
> + test_must_fail env GIT_EDITOR=true git replace --edit HEAD
> +'
> +
> test_done
--
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