lock_file: make function-local locks non-static

Placing `struct lock_file`s on the stack used to be a bad idea, because
the temp- and lockfile-machinery would keep a pointer into the struct.
But after 076aa2cbd (tempfile: auto-allocate tempfiles on heap,
2017-09-05), we can safely have lockfiles on the stack. (This applies
even if a user returns early, leaving a locked lock behind.)

These `struct lock_file`s are local to their respective functions and we
can drop their staticness.

For good measure, I have inspected these sites and come to believe that
they always release the lock, with the possible exception of bailing out
using `die()` or `exit()` or by returning from a `cmd_foo()`.

As pointed out by Jeff King, it would be bad if someone held on to a
`struct lock_file *` for some reason. After some grepping, I agree with
his findings: no-one appears to be doing that.

Signed-off-by: Martin Ågren <martin.agren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/builtin/describe.c b/builtin/describe.c
index e4869df7b4..8933aa969c 100644
--- a/builtin/describe.c
+++ b/builtin/describe.c
@@ -612,7 +612,7 @@ int cmd_describe(int argc, const char **argv, const char *prefix)
 				suffix = broken;
 			}
 		} else if (dirty) {
-			static struct lock_file index_lock;
+			struct lock_file index_lock = LOCK_INIT;
 			struct rev_info revs;
 			struct argv_array args = ARGV_ARRAY_INIT;
 			int fd, result;