path: root/builtin/describe.c
diff options
authorJunio C Hamano <>2017-10-10 03:42:58 (GMT)
committerJunio C Hamano <>2017-10-11 06:01:37 (GMT)
commitbe26d2b29b6a58fc53ed9d38c3f36b195f8a7cc9 (patch)
treee8875d8ec57b73010cabbe1c2b39e5eca4740559 /builtin/describe.c
parent4010f1d1b782eb7585e0e0abcefa794bd5ff29a0 (diff)
describe: do not use cmd_*() as a subroutine
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. Note that there is also an invocation of cmd_name_rev() at the end; "git describe --contains" massages its command line arguments to be suitable for "git name-rev" invocation and jumps to it, never to regain control. This call is left as-is as an exception to the rule. When we start to allow calling name-rev repeatedly as a helper function, we would be able to remove this call as well. Signed-off-by: Junio C Hamano <>
Diffstat (limited to 'builtin/describe.c')
1 files changed, 11 insertions, 4 deletions
diff --git a/builtin/describe.c b/builtin/describe.c
index 89ea1cd..5026375 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;
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;
suffix = dirty;