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builtin/apply: make apply_patch() return -1 or -128 instead of die()ing

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To libify `git apply` functionality we have to signal errors
to the caller instead of die()ing.

As a first step in this direction, let's make apply_patch() return
-1 or -128 in case of errors instead of dying. For now its only
caller apply_all_patches() will exit(128) when apply_patch()
return -128 and it will exit(1) when it returns -1.

We exit() with code 128 because that was what die() was doing
and we want to keep the distinction between exiting with code 1
and exiting with code 128.

Helped-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Christian Couder 2016-08-08 23:03:00 +02:00 committed by Junio C Hamano
parent 71501a71d0
commit f07a9f7643
1 changed files with 45 additions and 15 deletions
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60
builtin/apply.c
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@ -4404,6 +4404,15 @@ static struct lock_file lock_file;
#define INACCURATE_EOF (1<<0)
#define RECOUNT (1<<1)
/*
* Try to apply a patch.
*
* Returns:
* -128 if a bad error happened (like patch unreadable)
* -1 if patch did not apply and user cannot deal with it
* 0 if the patch applied
* 1 if the patch did not apply but user might fix it
*/
static int apply_patch(struct apply_state *state,
int fd,
const char *filename,
@ -4413,6 +4422,7 @@ static int apply_patch(struct apply_state *state,
struct strbuf buf = STRBUF_INIT; /* owns the patch text */
struct patch *list = NULL, **listp = &list;
int skipped_patch = 0;
int res = 0;
state->patch_input_file = filename;
read_patch_file(&buf, fd);
@ -4445,8 +4455,11 @@ static int apply_patch(struct apply_state *state,
offset += nr;
}
if (!list && !skipped_patch)
die(_("unrecognized input"));
if (!list && !skipped_patch) {
error(_("unrecognized input"));
res = -128;
goto end;
}
if (state->whitespace_error && (state->ws_error_action == die_on_ws_error))
state->apply = 0;
@ -4455,21 +4468,23 @@ static int apply_patch(struct apply_state *state,
if (state->update_index && state->newfd < 0)
state->newfd = hold_locked_index(state->lock_file, 1);
if (state->check_index) {
if (read_cache() < 0)
die(_("unable to read index file"));
if (state->check_index && read_cache() < 0) {
error(_("unable to read index file"));
res = -128;
goto end;
}
if ((state->check || state->apply) &&
check_patch_list(state, list) < 0 &&
!state->apply_with_reject)
exit(1);
!state->apply_with_reject) {
res = -1;
goto end;
}
if (state->apply && write_out_results(state, list)) {
if (state->apply_with_reject)
exit(1);
/* with --3way, we still need to write the index out */
return 1;
res = state->apply_with_reject ? -1 : 1;
goto end;
}
if (state->fake_ancestor)
@ -4484,10 +4499,11 @@ static int apply_patch(struct apply_state *state,
if (state->summary)
summary_patch_list(list);
end:
free_patch_list(list);
strbuf_release(&buf);
string_list_clear(&state->fn_table, 0);
return 0;
return res;
}
static void git_apply_config(void)
@ -4628,6 +4644,7 @@ static int apply_all_patches(struct apply_state *state,
int options)
{
int i;
int res;
int errs = 0;
int read_stdin = 1;
@ -4636,7 +4653,10 @@ static int apply_all_patches(struct apply_state *state,
int fd;
if (!strcmp(arg, "-")) {
errs |= apply_patch(state, 0, "<stdin>", options);
res = apply_patch(state, 0, "<stdin>", options);
if (res < 0)
goto end;
errs |= res;
read_stdin = 0;
continue;
} else if (0 < state->prefix_length)
@ -4649,12 +4669,19 @@ static int apply_all_patches(struct apply_state *state,
die_errno(_("can't open patch '%s'"), arg);
read_stdin = 0;
set_default_whitespace_mode(state);
errs |= apply_patch(state, fd, arg, options);
res = apply_patch(state, fd, arg, options);
if (res < 0)
goto end;
errs |= res;
close(fd);
}
set_default_whitespace_mode(state);
if (read_stdin)
errs |= apply_patch(state, 0, "<stdin>", options);
if (read_stdin) {
res = apply_patch(state, 0, "<stdin>", options);
if (res < 0)
goto end;
errs |= res;
}
if (state->whitespace_error) {
if (state->squelch_whitespace_errors &&
@ -4690,6 +4717,9 @@ static int apply_all_patches(struct apply_state *state,
}
return !!errs;
end:
exit(res == -1 ? 1 : 128);
}
int cmd_apply(int argc, const char **argv, const char *prefix)