[PATCH 12/20] tempfile: factor out deactivation

[Jeff King]

When we deactivate a tempfile, we also have to clean up the
"filename" strbuf. Let's pull this out into its own function
to keep the logic in one place (which will become more
important when a future patch makes it more complicated).

Note that we can use the same function when deactivating an
object that _isn't_ actually active yet (like when we hit an
error creating a tempfile). These callsites don't currently
reset the "active" flag to 0, but it's OK to do so (it's
just a noop for these cases).

Signed-off-by: Jeff King <p...@peff.net>
---
 tempfile.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/tempfile.c b/tempfile.c
index 0e6c6b9c18..9d7f0a2f2b 100644
--- a/tempfile.c
+++ b/tempfile.c
@@ -119,6 +119,12 @@ static void activate_tempfile(struct tempfile *tempfile)
        tempfile->active = 1;
 }
 
+static void deactivate_tempfile(struct tempfile *tempfile)
+{
+       tempfile->active = 0;
+       strbuf_reset(&tempfile->filename);
+}
+
 /* Make sure errno contains a meaningful value on error */
 int create_tempfile(struct tempfile *tempfile, const char *path)
 {
@@ -132,7 +138,7 @@ int create_tempfile(struct tempfile *tempfile, const char 
*path)
                tempfile->fd = open(tempfile->filename.buf,
                                    O_RDWR | O_CREAT | O_EXCL, 0666);
        if (tempfile->fd < 0) {
-               strbuf_reset(&tempfile->filename);
+               deactivate_tempfile(tempfile);
                return -1;
        }
        activate_tempfile(tempfile);
@@ -161,7 +167,7 @@ int mks_tempfile_sm(struct tempfile *tempfile,
        strbuf_add_absolute_path(&tempfile->filename, template);
        tempfile->fd = git_mkstemps_mode(tempfile->filename.buf, suffixlen, 
mode);
        if (tempfile->fd < 0) {
-               strbuf_reset(&tempfile->filename);
+               deactivate_tempfile(tempfile);
                return -1;
        }
        activate_tempfile(tempfile);
@@ -182,7 +188,7 @@ int mks_tempfile_tsm(struct tempfile *tempfile,
        strbuf_addf(&tempfile->filename, "%s/%s", tmpdir, template);
        tempfile->fd = git_mkstemps_mode(tempfile->filename.buf, suffixlen, 
mode);
        if (tempfile->fd < 0) {
-               strbuf_reset(&tempfile->filename);
+               deactivate_tempfile(tempfile);
                return -1;
        }
        activate_tempfile(tempfile);
@@ -291,8 +297,7 @@ int rename_tempfile(struct tempfile *tempfile, const char 
*path)
                return -1;
        }
 
-       tempfile->active = 0;
-       strbuf_reset(&tempfile->filename);
+       deactivate_tempfile(tempfile);
        return 0;
 }
 
@@ -303,6 +308,5 @@ void delete_tempfile(struct tempfile *tempfile)
 
        close_tempfile_gently(tempfile);
        unlink_or_warn(tempfile->filename.buf);
-       tempfile->active = 0;
-       strbuf_reset(&tempfile->filename);
+       deactivate_tempfile(tempfile);
 }
-- 
2.14.1.721.gc5bc1565f1