The cmd_foo() function is a moral equivalent of 'main' for a Git
subcommand 'git foo', and as such, it is allowed to do many things
that make it unsuitable to be called as a subroutine, including
- call exit(3) to terminate the process;
- allocate resource held and used throughout its lifetime, without
releasing it upon return/exit;
- rely on global variables being initialized at program startup,
and update them as needed, making another clean invocation of the
function impossible.
The call to cmd_diff_index() "git describe" makes has been working
by accident that the function did not call exit(3); it sets a bad
precedent for people to cut and paste.
We could invoke it via the run_command() interface, but the diff
family of commands have helper functions in diff-lib.c that are
meant to be usable as subroutines, and using the latter does not
make the resulting code all that longer. Use it.
Signed-off-by: Junio C Hamano <gits...@pobox.com>
---
builtin/describe.c | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/builtin/describe.c b/builtin/describe.c
index 89ea1cdd60..50263759cb 100644
--- a/builtin/describe.c
+++ b/builtin/describe.c
@@ -7,12 +7,12 @@
#include "builtin.h"
#include "exec_cmd.h"
#include "parse-options.h"
+#include "revision.h"
#include "diff.h"
#include "hashmap.h"
#include "argv-array.h"
#include "run-command.h"
-#define SEEN (1u << 0)
#define MAX_TAGS (FLAG_BITS - 1)
static const char * const describe_usage[] = {
@@ -532,7 +532,9 @@ int cmd_describe(int argc, const char **argv, const char
*prefix)
}
} else if (dirty) {
static struct lock_file index_lock;
- int fd;
+ struct rev_info revs;
+ struct argv_array args = ARGV_ARRAY_INIT;
+ int fd, result;
read_cache_preload(NULL);
refresh_index(&the_index,
REFRESH_QUIET|REFRESH_UNMERGED,
@@ -541,8 +543,13 @@ int cmd_describe(int argc, const char **argv, const char
*prefix)
if (0 <= fd)
update_index_if_able(&the_index, &index_lock);
- if (!cmd_diff_index(ARRAY_SIZE(diff_index_args) - 1,
- diff_index_args, prefix))
+ init_revisions(&revs, prefix);
+ argv_array_pushv(&args, diff_index_args);
+ if (setup_revisions(args.argc, args.argv, &revs, NULL)
!= 1)
+ BUG("malformed internal diff-index command
line");
+ result = run_diff_index(&revs, 0);
+
+ if (!diff_result_code(&revs.diffopt, result))
suffix = NULL;
else
suffix = dirty;
--
2.15.0-rc0-203-g4c8d0e28b1
