Merge branch 'jk/write-in-full-fix'

Many codepaths did not diagnose write failures correctly when disks
go full, due to their misuse of write_in_full() helper function,
which have been corrected.

* jk/write-in-full-fix:
  read_pack_header: handle signed/unsigned comparison in read result
  config: flip return value of store_write_*()
  notes-merge: use ssize_t for write_in_full() return value
  pkt-line: check write_in_full() errors against "< 0"
  convert less-trivial versions of "write_in_full() != len"
  avoid "write_in_full(fd, buf, len) != len" pattern
  get-tar-commit-id: check write_in_full() return against 0
  config: avoid "write_in_full(fd, buf, len) < len" pattern

1 files changed, 19 insertions, 19 deletions

diff --git a/config.c b/config.c
index cd5a69e630..a77cae56ed 100644
--- a/config.c
+++ b/config.c
@@ -2292,10 +2292,11 @@ static int write_error(const char *filename)
 	return 4;
 }
 
-static int store_write_section(int fd, const char *key)
+static ssize_t write_section(int fd, const char *key)
 {
 	const char *dot;
-	int i, success;
+	int i;
+	ssize_t ret;
 	struct strbuf sb = STRBUF_INIT;
 
 	dot = memchr(key, '.', store.baselen);
@@ -2311,15 +2312,16 @@ static int store_write_section(int fd, const char *key)
 		strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
 	}
 
-	success = write_in_full(fd, sb.buf, sb.len) == sb.len;
+	ret = write_in_full(fd, sb.buf, sb.len);
 	strbuf_release(&sb);
 
-	return success;
+	return ret;
 }
 
-static int store_write_pair(int fd, const char *key, const char *value)
+static ssize_t write_pair(int fd, const char *key, const char *value)
 {
-	int i, success;
+	int i;
+	ssize_t ret;
 	int length = strlen(key + store.baselen + 1);
 	const char *quote = "";
 	struct strbuf sb = STRBUF_INIT;
@@ -2359,10 +2361,10 @@ static int store_write_pair(int fd, const char *key, const char *value)
 		}
 	strbuf_addf(&sb, "%s\n", quote);
 
-	success = write_in_full(fd, sb.buf, sb.len) == sb.len;
+	ret = write_in_full(fd, sb.buf, sb.len);
 	strbuf_release(&sb);
 
-	return success;
+	return ret;
 }
 
 static ssize_t find_beginning_of_line(const char *contents, size_t size,
@@ -2491,8 +2493,8 @@ int git_config_set_multivar_in_file_gently(const char *config_filename,
 		}
 
 		store.key = (char *)key;
-		if (!store_write_section(fd, key) ||
-		    !store_write_pair(fd, key, value))
+		if (write_section(fd, key) < 0 ||
+		    write_pair(fd, key, value) < 0)
 			goto write_err_out;
 	} else {
 		struct stat st;
@@ -2602,11 +2604,10 @@ int git_config_set_multivar_in_file_gently(const char *config_filename,
 			/* write the first part of the config */
 			if (copy_end > copy_begin) {
 				if (write_in_full(fd, contents + copy_begin,
-						  copy_end - copy_begin) <
-				    copy_end - copy_begin)
+						  copy_end - copy_begin) < 0)
 					goto write_err_out;
 				if (new_line &&
-				    write_str_in_full(fd, "\n") != 1)
+				    write_str_in_full(fd, "\n") < 0)
 					goto write_err_out;
 			}
 			copy_begin = store.offset[i];
@@ -2615,18 +2616,17 @@ int git_config_set_multivar_in_file_gently(const char *config_filename,
 		/* write the pair (value == NULL means unset) */
 		if (value != NULL) {
 			if (store.state == START) {
-				if (!store_write_section(fd, key))
+				if (write_section(fd, key) < 0)
 					goto write_err_out;
 			}
-			if (!store_write_pair(fd, key, value))
+			if (write_pair(fd, key, value) < 0)
 				goto write_err_out;
 		}
 
 		/* write the rest of the config */
 		if (copy_begin < contents_sz)
 			if (write_in_full(fd, contents + copy_begin,
-					  contents_sz - copy_begin) <
-			    contents_sz - copy_begin)
+					  contents_sz - copy_begin) < 0)
 				goto write_err_out;
 
 		munmap(contents, contents_sz);
@@ -2803,7 +2803,7 @@ int git_config_rename_section_in_file(const char *config_filename,
 					continue;
 				}
 				store.baselen = strlen(new_name);
-				if (!store_write_section(out_fd, new_name)) {
+				if (write_section(out_fd, new_name) < 0) {
 					ret = write_error(get_lock_file_path(lock));
 					goto out;
 				}
@@ -2829,7 +2829,7 @@ int git_config_rename_section_in_file(const char *config_filename,
 		if (remove)
 			continue;
 		length = strlen(output);
-		if (write_in_full(out_fd, output, length) != length) {
+		if (write_in_full(out_fd, output, length) < 0) {
 			ret = write_error(get_lock_file_path(lock));
 			goto out;
 		}