gc: improve handling of errors reading gc.log

A collection of minor error handling fixes:

- use an error message in lower case, following the usual style
- quote filenames in error messages to make them easier to read and to
  decrease translation load by matching other 'stat' error messages
- check for and report errors from 'read', too
- avoid being confused by a gc.log larger than INT_MAX bytes

Noticed by code inspection.

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/gc.c b/builtin/gc.c
index ccfb1ce..d69fc4c 100644 (file)
--- a/builtin/gc.c
+++ b/builtin/gc.c
@@ -442,6 +442,7 @@ static int report_last_gc_error(void)
 {
        struct strbuf sb = STRBUF_INIT;
        int ret = 0;
+       ssize_t len;
        struct stat st;
        char *gc_log_path = git_pathdup("gc.log");
 
@@ -449,15 +450,17 @@ static int report_last_gc_error(void)
                if (errno == ENOENT)
                        goto done;
 
-               ret = error_errno(_("Can't stat %s"), gc_log_path);
+               ret = error_errno(_("cannot stat '%s'"), gc_log_path);
                goto done;
        }
 
        if (st.st_mtime < gc_log_expire_time)
                goto done;
 
-       ret = strbuf_read_file(&sb, gc_log_path, 0);
-       if (ret > 0)
+       len = strbuf_read_file(&sb, gc_log_path, 0);
+       if (len < 0)
+               ret = error_errno(_("cannot read '%s'"), gc_log_path);
+       else if (len > 0)
                ret = error(_("The last gc run reported the following. "
                               "Please correct the root cause\n"
                               "and remove %s.\n"