Make some of fwrite/fclose/write/close failures visible

So that full filesystem conditions or permissions problems won't go
unnoticed.

Signed-off-by: Alex Riesen <raa.lkml@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin-fsck.c b/builtin-fsck.c
index d3f3de9446a9184e9457fe4b743c4e43a9256597..afded5e68db35cb5eca789e948bc1cb2ef2de0bc 100644 (file)
--- a/builtin-fsck.c
+++ b/builtin-fsck.c
@@ -201,12 +201,16 @@ static void check_unreachable_object(struct object *obj)
                                char *buf = read_sha1_file(obj->sha1,
                                                &type, &size);
                                if (buf) {
-                                       fwrite(buf, size, 1, f);
+                                       if (fwrite(buf, size, 1, f) != 1)
+                                               die("Could not write %s: %s",
+                                                   filename, strerror(errno));
                                        free(buf);
                                }
                        } else
                                fprintf(f, "%s\n", sha1_to_hex(obj->sha1));
-                       fclose(f);
+                       if (fclose(f))
+                               die("Could not finish %s: %s",
+                                   filename, strerror(errno));
                }
                return;
        }

diff --git a/builtin-merge.c b/builtin-merge.c
index 7c2b90c70baed2c7f008c2b98ad26135ef12db00..cf869751b41c256363bf5f0c465e46684e2920b8 100644 (file)
--- a/builtin-merge.c
+++ b/builtin-merge.c
@@ -293,8 +293,10 @@ static void squash_message(void)
                pretty_print_commit(rev.commit_format, commit, &out, rev.abbrev,
                        NULL, NULL, rev.date_mode, 0);
        }
-       write(fd, out.buf, out.len);
-       close(fd);
+       if (write(fd, out.buf, out.len) < 0)
+               die("Writing SQUASH_MSG: %s", strerror(errno));
+       if (close(fd))
+               die("Finishing SQUASH_MSG: %s", strerror(errno));
        strbuf_release(&out);
 }
 

diff --git a/rerere.c b/rerere.c
index 02931a151f1abe183763c9a1edb65ffd36d83bc3..718fb526dd1fbbc5de18784586d37d6069807b77 100644 (file)
--- a/rerere.c
+++ b/rerere.c
@@ -70,6 +70,19 @@ static int write_rr(struct string_list *rr, int out_fd)
        return 0;
 }
 
+static void ferr_write(const void *p, size_t count, FILE *fp, int *err)
+{
+       if (!count || *err)
+               return;
+       if (fwrite(p, count, 1, fp) != 1)
+               *err = errno;
+}
+
+static inline void ferr_puts(const char *s, FILE *fp, int *err)
+{
+       ferr_write(s, strlen(s), fp, err);
+}
+
 static int handle_file(const char *path,
         unsigned char *sha1, const char *output)
 {
@@ -82,6 +95,7 @@ static int handle_file(const char *path,
        struct strbuf one = STRBUF_INIT, two = STRBUF_INIT;
        FILE *f = fopen(path, "r");
        FILE *out = NULL;
+       int wrerror = 0;
 
        if (!f)
                return error("Could not open %s", path);
@@ -118,11 +132,11 @@ static int handle_file(const char *path,
                        hunk_no++;
                        hunk = RR_CONTEXT;
                        if (out) {
-                               fputs("<<<<<<<\n", out);
-                               fwrite(one.buf, one.len, 1, out);
-                               fputs("=======\n", out);
-                               fwrite(two.buf, two.len, 1, out);
-                               fputs(">>>>>>>\n", out);
+                               ferr_puts("<<<<<<<\n", out, &wrerror);
+                               ferr_write(one.buf, one.len, out, &wrerror);
+                               ferr_puts("=======\n", out, &wrerror);
+                               ferr_write(two.buf, two.len, out, &wrerror);
+                               ferr_puts(">>>>>>>\n", out, &wrerror);
                        }
                        if (sha1) {
                                git_SHA1_Update(&ctx, one.buf ? one.buf : "",
@@ -139,7 +153,7 @@ static int handle_file(const char *path,
                else if (hunk == RR_SIDE_2)
                        strbuf_addstr(&two, buf);
                else if (out)
-                       fputs(buf, out);
+                       ferr_puts(buf, out, &wrerror);
                continue;
        bad:
                hunk = 99; /* force error exit */
@@ -149,8 +163,12 @@ static int handle_file(const char *path,
        strbuf_release(&two);
 
        fclose(f);
-       if (out)
-               fclose(out);
+       if (wrerror)
+               error("There were errors while writing %s (%s)",
+                     path, strerror(wrerror));
+       if (out && fclose(out))
+               wrerror = error("Failed to flush %s: %s",
+                               path, strerror(errno));
        if (sha1)
                git_SHA1_Final(sha1, &ctx);
        if (hunk != RR_CONTEXT) {
@@ -158,6 +176,8 @@ static int handle_file(const char *path,
                        unlink(output);
                return error("Could not parse conflict hunks in %s", path);
        }
+       if (wrerror)
+               return -1;
        return hunk_no;
 }
 
@@ -200,9 +220,13 @@ static int merge(const char *name, const char *path)
        if (!ret) {
                FILE *f = fopen(path, "w");
                if (!f)
-                       return error("Could not write to %s", path);
-               fwrite(result.ptr, result.size, 1, f);
-               fclose(f);
+                       return error("Could not open %s: %s", path,
+                                    strerror(errno));
+               if (fwrite(result.ptr, result.size, 1, f) != 1)
+                       error("Could not write %s: %s", path, strerror(errno));
+               if (fclose(f))
+                       return error("Writing %s failed: %s", path,
+                                    strerror(errno));
        }
 
        free(cur.ptr);