detect close failure on just-written file handles
I audited git for potential undetected write failures.
In the cases fixed below, the diagnostics I add mimic the diagnostics
used in surrounding code, even when that means not reporting
the precise strerror(errno) cause of the error.
Signed-off-by: Jim Meyering <jim@meyering.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/builtin-init-db.c b/builtin-init-db.c
index 0be2d2e..976f47b 100644
--- a/builtin-init-db.c
+++ b/builtin-init-db.c
@@ -40,7 +40,8 @@
return fdo;
}
status = copy_fd(fdi, fdo);
- close(fdo);
+ if (close(fdo) != 0)
+ return error("%s: write error: %s", dst, strerror(errno));
if (!status && adjust_shared_perm(dst))
return -1;
diff --git a/builtin-rerere.c b/builtin-rerere.c
index f6409b9..29fb075 100644
--- a/builtin-rerere.c
+++ b/builtin-rerere.c
@@ -57,7 +57,8 @@
write_in_full(out_fd, path, length) != length)
die("unable to write rerere record");
}
- close(out_fd);
+ if (close(out_fd) != 0)
+ die("unable to write rerere record");
return commit_lock_file(&write_lock);
}
diff --git a/index-pack.c b/index-pack.c
index 82c8da3..8403c36 100644
--- a/index-pack.c
+++ b/index-pack.c
@@ -634,7 +634,8 @@
write_or_die(keep_fd, keep_msg, keep_msg_len);
write_or_die(keep_fd, "\n", 1);
}
- close(keep_fd);
+ if (close(keep_fd) != 0)
+ die("cannot write keep file");
report = "keep";
}
}
diff --git a/refs.c b/refs.c
index 67ac97c..4dc7e8b 100644
--- a/refs.c
+++ b/refs.c
@@ -1106,8 +1106,7 @@
len += sprintf(logrec + len - 1, "\t%.*s\n", msglen, msg) - 1;
written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1;
free(logrec);
- close(logfd);
- if (written != len)
+ if (close(logfd) != 0 || written != len)
return error("Unable to append to %s", log_file);
return 0;
}
@@ -1204,8 +1203,7 @@
goto error_free_return;
}
written = write_in_full(fd, ref, len);
- close(fd);
- if (written != len) {
+ if (close(fd) != 0 || written != len) {
error("Unable to write to %s", lockpath);
goto error_unlink_return;
}
