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[PATCH 12/20] tempfile: factor out deactivation

From
Jeff King <peff@peff.net>
Date
Sep 5, 2017, 12:14 UTC
Message-ID
<20170905121449.wnxj5tperwnoevch@sigill.intra.peff.net>
In-Reply-To
<20170905121353.62zg3mtextmq5zrs@sigill.intra.peff.net>

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 <peff@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
Previous: Jeff KingNext: Jeff King
Message 13 of 21 in “allowing struct lock_file to be deleted”
  1. 0/20 allowing struct lock_file to be deletedJeff King, Sep 5, 2017
  2. 01/20 write_index_as_tree: cleanup tempfile on errorJeff King, Sep 5, 2017
  3. 02/20 setup_temporary_shallow: avoid using inactive tempfileJeff King, Sep 5, 2017
  4. 03/20 setup_temporary_shallow: move tempfile struct into functionJeff King, Sep 5, 2017
  5. 04/20 verify_signed_buffer: prefer close_tempfile() to close()Jeff King, Sep 5, 2017
  6. 05/20 always check return value of close_tempfileJeff King, Sep 5, 2017
  7. 06/20 tempfile: do not delete tempfile on failed closeJeff King, Sep 5, 2017
  8. 07/20 lockfile: do not rollback lock on failed closeJeff King, Sep 5, 2017
  9. 08/20 tempfile: prefer is_tempfile_active to bare accessJeff King, Sep 5, 2017
  10. 09/20 tempfile: handle NULL tempfile pointers gracefullyJeff King, Sep 5, 2017
  11. 10/20 tempfile: replace die("BUG") with BUG()Jeff King, Sep 5, 2017
  12. 11/20 tempfile: factor out activationJeff King, Sep 5, 2017
  13. 12/20 tempfile: factor out deactivationJeff King, Sep 5, 2017
  14. 13/20 tempfile: robustify cleanup handlerJeff King, Sep 5, 2017
  15. 14/20 tempfile: release deactivated strbufs instead of resettingJeff King, Sep 5, 2017
  16. 16/20 tempfile: remove deactivated list entriesJeff King, Sep 5, 2017
  17. 17/20 tempfile: auto-allocate tempfiles on heapJeff King, Sep 5, 2017
  18. 18/20 lockfile: update lifetime requirements in documentationJeff King, Sep 5, 2017
  19. 19/20 ref_lock: stop leaking lock_filesJeff King, Sep 5, 2017
  20. 20/20 stop leaking lock structs in some simple casesJeff King, Sep 5, 2017
  21. 15/20 tempfile: use list.h for linked listJeff King, Sep 5, 2017

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