From: Aleen <aleen42@xxxxxxxxxx>
Since that the command 'git-format-patch' can include patches of
commits that emit no changes, the 'git-am' command should also
support an option, named as '--empty', to specify how to handle
those empty patches. In this commit, we have implemented three
valid options ('die', 'drop' and 'keep').
Signed-off-by: 徐沛文 (Aleen) <aleen42@xxxxxxxxxx>
---
Documentation/git-am.txt | 8 ++++++
builtin/am.c | 55 ++++++++++++++++++++++++++++++++++++----
t/t4150-am.sh | 49 +++++++++++++++++++++++++++++++++++
3 files changed, 107 insertions(+), 5 deletions(-)
diff --git a/Documentation/git-am.txt b/Documentation/git-am.txt
index 0a4a984dfde..ba17063f621 100644
--- a/Documentation/git-am.txt
+++ b/Documentation/git-am.txt
@@ -16,6 +16,7 @@ SYNOPSIS
[--exclude=<path>] [--include=<path>] [--reject] [-q | --quiet]
[--[no-]scissors] [-S[<keyid>]] [--patch-format=<format>]
[--quoted-cr=<action>]
+ [--empty=(die|drop|keep)]
[(<mbox> | <Maildir>)...]
'git am' (--continue | --skip | --abort | --quit | --show-current-patch[=(diff|raw)])
@@ -63,6 +64,13 @@ OPTIONS
--quoted-cr=<action>::
This flag will be passed down to 'git mailinfo' (see linkgit:git-mailinfo[1]).
+--empty=(die|drop|keep)::
+ By default, or when the option is set to 'die', the command
+ errors out on an input e-mail message that lacks a patch. When
+ this option is set to 'drop', skip such an e-mail message instead.
+ When this option is set to 'keep', create an empty commit,
+ recording the contents of the e-mail message as its log.
+
-m::
--message-id::
Pass the `-m` flag to 'git mailinfo' (see linkgit:git-mailinfo[1]),
diff --git a/builtin/am.c b/builtin/am.c
index 8677ea2348a..cc6512275aa 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -87,6 +87,12 @@ enum show_patch_type {
SHOW_PATCH_DIFF = 1,
};
+enum empty_action {
+ DIE_EMPTY_COMMIT = 0, /* output errors */
+ DROP_EMPTY_COMMIT, /* skip with a notice message, unless "--quiet" has been passed */
+ KEEP_EMPTY_COMMIT /* keep recording as empty commits */
+};
+
struct am_state {
/* state directory path */
char *dir;
@@ -118,6 +124,7 @@ struct am_state {
int message_id;
int scissors; /* enum scissors_type */
int quoted_cr; /* enum quoted_cr_action */
+ int empty_type; /* enum empty_action */
struct strvec git_apply_opts;
const char *resolvemsg;
int committer_date_is_author_date;
@@ -178,6 +185,25 @@ static int am_option_parse_quoted_cr(const struct option *opt,
return 0;
}
+static int am_option_parse_empty(const struct option *opt,
+ const char *arg, int unset)
+{
+ int *opt_value = opt->value;
+
+ BUG_ON_OPT_NEG(unset);
+
+ if (!strcmp(arg, "die"))
+ *opt_value = DIE_EMPTY_COMMIT;
+ else if (!strcmp(arg, "drop"))
+ *opt_value = DROP_EMPTY_COMMIT;
+ else if (!strcmp(arg, "keep"))
+ *opt_value = KEEP_EMPTY_COMMIT;
+ else
+ return error(_("Invalid value for --empty: %s"), arg);
+
+ return 0;
+}
+
/**
* Returns path relative to the am_state directory.
*/
@@ -1248,11 +1274,6 @@ static int parse_mail(struct am_state *state, const char *mail)
goto finish;
}
- if (is_empty_or_missing_file(am_path(state, "patch"))) {
- printf_ln(_("Patch is empty."));
- die_user_resolve(state);
- }
-
strbuf_addstr(&msg, "\n\n");
strbuf_addbuf(&msg, &mi.log_message);
strbuf_stripspace(&msg, 0);
@@ -1763,6 +1784,7 @@ static void am_run(struct am_state *state, int resume)
while (state->cur <= state->last) {
const char *mail = am_path(state, msgnum(state));
int apply_status;
+ int to_keep;
reset_ident_date();
@@ -1792,8 +1814,27 @@ static void am_run(struct am_state *state, int resume)
if (state->interactive && do_interactive(state))
goto next;
+ to_keep = 0;
+ if (is_empty_or_missing_file(am_path(state, "patch"))) {
+ switch (state->empty_type) {
+ case DROP_EMPTY_COMMIT:
+ say(state, stdout, _("Skipping: %.*s"), linelen(state->msg), state->msg);
+ goto next;
+ break;
+ case KEEP_EMPTY_COMMIT:
+ to_keep = 1;
+ break;
+ case DIE_EMPTY_COMMIT:
+ printf_ln(_("Patch is empty."));
+ die_user_resolve(state);
+ break;
+ }
+ }
+
if (run_applypatch_msg_hook(state))
exit(1);
+ if (to_keep)
+ goto commit;
say(state, stdout, _("Applying: %.*s"), linelen(state->msg), state->msg);
@@ -1827,6 +1868,7 @@ static void am_run(struct am_state *state, int resume)
die_user_resolve(state);
}
+commit:
do_commit(state);
next:
@@ -2357,6 +2399,9 @@ int cmd_am(int argc, const char **argv, const char *prefix)
{ OPTION_STRING, 'S', "gpg-sign", &state.sign_commit, N_("key-id"),
N_("GPG-sign commits"),
PARSE_OPT_OPTARG, NULL, (intptr_t) "" },
+ OPT_CALLBACK_F(0, "empty", &state.empty_type, "{drop,keep,die}",
+ N_("how to handle empty patches"),
+ PARSE_OPT_NONEG, am_option_parse_empty),
OPT_HIDDEN_BOOL(0, "rebasing", &state.rebasing,
N_("(internal use for git-rebase)")),
OPT_END()
diff --git a/t/t4150-am.sh b/t/t4150-am.sh
index 2aaaa0d7ded..8c8bd4db220 100755
--- a/t/t4150-am.sh
+++ b/t/t4150-am.sh
@@ -196,6 +196,12 @@ test_expect_success setup '
git format-patch -M --stdout lorem^ >rename-add.patch &&
+ git checkout -b empty-commit &&
+ git commit -m "empty commit" --allow-empty &&
+
+ : >empty.patch &&
+ git format-patch --always --stdout empty-commit^ >empty-commit.patch &&
+
# reset time
sane_unset test_tick &&
test_tick
@@ -1152,4 +1158,47 @@ test_expect_success 'apply binary blob in partial clone' '
git -C client am ../patch
'
+test_expect_success 'an empty input file is error regardless of --empty option' '
+ test_when_finished "git am --abort || :" &&
+ test_must_fail git am --empty=drop empty.patch 2>actual &&
+ echo "Patch format detection failed." >expected &&
+ test_cmp expected actual
+'
+
+test_expect_success 'invalid when passing the --empty option alone' '
+ test_when_finished "git am --abort || :" &&
+ git checkout empty-commit^ &&
+ test_must_fail git am --empty empty-commit.patch 2>err &&
+ echo "error: Invalid value for --empty: empty-commit.patch" >expected &&
+ test_cmp expected err
+'
+
+test_expect_success 'a message without a patch is an error (default)' '
+ test_when_finished "git am --abort || :" &&
+ test_must_fail git am empty-commit.patch >err &&
+ grep "Patch is empty" err
+'
+
+test_expect_success 'a message without a patch is an error where an explicit "--empty=die" is given' '
+ test_when_finished "git am --abort || :" &&
+ test_must_fail git am --empty=die empty-commit.patch >err &&
+ grep "Patch is empty." err
+'
+
+test_expect_success 'a message without a patch will be skipped when "--empty=drop" is given' '
+ git am --empty=drop empty-commit.patch >output &&
+ git rev-parse empty-commit^ >expected &&
+ git rev-parse HEAD >actual &&
+ test_cmp expected actual &&
+ grep "Skipping: empty commit" output
+'
+
+test_expect_success 'record as an empty commit when meeting e-mail message that lacks a patch' '
+ git am --empty=keep empty-commit.patch &&
+ test_path_is_missing .git/rebase-apply &&
+ git show empty-commit --format="%s" >expected &&
+ git show HEAD --format="%s" >actual &&
+ test_cmp actual expected
+'
+
test_done
--
gitgitgadget
