From: Richard Jones <rjones@redhat.com>
Date: Fri, 12 Feb 2010 14:06:25 +0000 (+0000)
Subject: daemon: Don't need to prefix error messages with the command name.
X-Git-Tag: 1.0.84~1
X-Git-Url: http://git.annexia.org/?p=libguestfs.git;a=commitdiff_plain;h=e9c37113104c1cfb234535adc9b52ad3880a41ce

daemon: Don't need to prefix error messages with the command name.

The RPC stubs already prefix the command name to error messages.
The daemon doesn't have to do this.  As a (small) benefit this also
makes the daemon slightly smaller.

Code in the daemon such as:

  if (argv[0] == NULL) {
    reply_with_error ("passed an empty list");
    return NULL;
  }

now results in error messages like this:

  ><fs> command ""
  libguestfs: error: command: passed an empty list

(whereas previously you would have seen ..command: command:..)
---

diff --git a/daemon/blkid.c b/daemon/blkid.c
index 4e14881..4c77b82 100644
--- a/daemon/blkid.c
+++ b/daemon/blkid.c
@@ -36,7 +36,7 @@ do_vfs_type (const char *device)
   r = command (&out, &err,
                "/sbin/blkid", "-o", "value", "-s", "TYPE", device, NULL);
   if (r == -1) {
-    reply_with_error ("vfs_type: %s: %s", device, err);
+    reply_with_error ("%s: %s", device, err);
     free (out);
     free (err);
     return NULL;
diff --git a/daemon/blockdev.c b/daemon/blockdev.c
index 4d3c2ab..95e5246 100644
--- a/daemon/blockdev.c
+++ b/daemon/blockdev.c
@@ -111,7 +111,7 @@ int
 do_blockdev_setbsz (const char *device, int blocksize)
 {
   if (blocksize <= 0 /* || blocksize >= what? */) {
-    reply_with_error ("blockdev_setbsz: blocksize must be > 0");
+    reply_with_error ("blocksize must be > 0");
     return -1;
   }
   return (int) call_blockdev (device, "--setbsz", blocksize, 0);
diff --git a/daemon/cmp.c b/daemon/cmp.c
index 2b7e33b..bbf9c74 100644
--- a/daemon/cmp.c
+++ b/daemon/cmp.c
@@ -53,7 +53,7 @@ do_equal (const char *file1, const char *file2)
   free (file2buf);
 
   if (r == -1 || r > 1) {
-    reply_with_error ("cmp: %s", err);
+    reply_with_error ("%s", err);
     free (err);
     return -1;
   }
diff --git a/daemon/command.c b/daemon/command.c
index b2350ec..ca06478 100644
--- a/daemon/command.c
+++ b/daemon/command.c
@@ -43,7 +43,7 @@ do_command (char *const *argv)
    * commandv.  We just have to check the list is non-empty.
    */
   if (argv[0] == NULL) {
-    reply_with_error ("command: passed an empty list");
+    reply_with_error ("passed an empty list");
     return NULL;
   }
 
diff --git a/daemon/cpmv.c b/daemon/cpmv.c
index 47b8aa2..587e017 100644
--- a/daemon/cpmv.c
+++ b/daemon/cpmv.c
@@ -74,7 +74,7 @@ cpmv_cmd (const char *cmd, const char *flags, const char *src, const char *dest)
   free (destbuf);
 
   if (r == -1) {
-    reply_with_error ("%s: %s", cmd, err);
+    reply_with_error ("%s", err);
     free (err);
     return -1;
   }
diff --git a/daemon/daemon.h b/daemon/daemon.h
index 88d0306..bb1ebb3 100644
--- a/daemon/daemon.h
+++ b/daemon/daemon.h
@@ -116,7 +116,10 @@ extern int sync_disks (void);
 /*-- in proto.c --*/
 extern void main_loop (int sock) __attribute__((noreturn));
 
-/* ordinary daemon functions use these to indicate errors */
+/* ordinary daemon functions use these to indicate errors
+ * NB: you don't need to prefix the string with the current command,
+ * it is added automatically by the client-side RPC stubs.
+ */
 extern void reply_with_error (const char *fs, ...)
   __attribute__((format (printf,1,2)));
 extern void reply_with_perror_errno (int err, const char *fs, ...)
diff --git a/daemon/dd.c b/daemon/dd.c
index 0a53b31..d92dac0 100644
--- a/daemon/dd.c
+++ b/daemon/dd.c
@@ -62,7 +62,7 @@ do_dd (const char *src, const char *dest)
   free (of_arg);
 
   if (r == -1) {
-    reply_with_error ("dd: %s: %s: %s", src, dest, err);
+    reply_with_error ("%s: %s: %s", src, dest, err);
     free (err);
     return -1;
   }
diff --git a/daemon/debug.c b/daemon/debug.c
index cb905cb..5d26c4e 100644
--- a/daemon/debug.c
+++ b/daemon/debug.c
@@ -215,7 +215,7 @@ debug_sh (const char *subcmd, int argc, char *const *const argv)
   char *out;
 
   if (argc < 1) {
-    reply_with_error ("debug: sh: expecting a command to run");
+    reply_with_error ("sh: expecting a command to run");
     return NULL;
   }
 
diff --git a/daemon/df.c b/daemon/df.c
index 563760d..b5c4980 100644
--- a/daemon/df.c
+++ b/daemon/df.c
@@ -37,7 +37,7 @@ do_df (void)
 
   r = command (&out, &err, "df", NULL);
   if (r == -1) {
-    reply_with_error ("df: %s", err);
+    reply_with_error ("%s", err);
     free (out);
     free (err);
     return NULL;
@@ -58,7 +58,7 @@ do_df_h (void)
 
   r = command (&out, &err, "df", "-h", NULL);
   if (r == -1) {
-    reply_with_error ("df -h: %s", err);
+    reply_with_error ("%s", err);
     free (out);
     free (err);
     return NULL;
diff --git a/daemon/dir.c b/daemon/dir.c
index 300bb4c..205139b 100644
--- a/daemon/dir.c
+++ b/daemon/dir.c
@@ -39,7 +39,7 @@ do_rmdir (const char *path)
   CHROOT_OUT;
 
   if (r == -1) {
-    reply_with_perror ("rmdir: %s", path);
+    reply_with_perror ("%s", path);
     return -1;
   }
 
@@ -57,7 +57,7 @@ do_rm_rf (const char *path)
   char *buf, *err;
 
   if (STREQ (path, "/")) {
-    reply_with_error ("rm -rf: cannot remove root directory");
+    reply_with_error ("cannot remove root directory");
     return -1;
   }
 
@@ -72,7 +72,7 @@ do_rm_rf (const char *path)
 
   /* rm -rf is never supposed to fail.  I/O errors perhaps? */
   if (r == -1) {
-    reply_with_error ("rm -rf: %s: %s", path, err);
+    reply_with_error ("%s: %s", path, err);
     free (err);
     return -1;
   }
@@ -92,7 +92,7 @@ do_mkdir (const char *path)
   CHROOT_OUT;
 
   if (r == -1) {
-    reply_with_perror ("mkdir: %s", path);
+    reply_with_perror ("%s", path);
     return -1;
   }
 
@@ -109,7 +109,7 @@ do_mkdir_mode (const char *path, int mode)
   CHROOT_OUT;
 
   if (r == -1) {
-    reply_with_perror ("mkdir_mode: %s", path);
+    reply_with_perror ("%s", path);
     return -1;
   }
 
@@ -174,11 +174,11 @@ do_mkdir_p (const char *path)
   CHROOT_OUT;
 
   if (r == -1) {
-    reply_with_perror ("mkdir -p: %s", path);
+    reply_with_perror ("%s", path);
     return -1;
   }
   if (r == -2) {
-    reply_with_error ("mkdir -p: %s: a path element was not a directory", path);
+    reply_with_error ("%s: a path element was not a directory", path);
     return -1;
   }
 
@@ -221,7 +221,7 @@ do_mkdtemp (const char *template)
   CHROOT_OUT;
 
   if (r == NULL) {
-    reply_with_perror ("mkdtemp: %s", template);
+    reply_with_perror ("%s", template);
     free (writable);
   }
 
diff --git a/daemon/dmesg.c b/daemon/dmesg.c
index adc3426..462787a 100644
--- a/daemon/dmesg.c
+++ b/daemon/dmesg.c
@@ -35,7 +35,7 @@ do_dmesg (void)
 
   r = command (&out, &err, "dmesg", NULL);
   if (r == -1) {
-    reply_with_error ("dmesg: %s", err);
+    reply_with_error ("%s", err);
     free (out);
     free (err);
     return NULL;
diff --git a/daemon/du.c b/daemon/du.c
index e6df245..942a699 100644
--- a/daemon/du.c
+++ b/daemon/du.c
@@ -46,7 +46,7 @@ do_du (const char *path)
   r = command (&out, &err, "du", "-s", buf, NULL);
   free (buf);
   if (r == -1) {
-    reply_with_error ("du: %s: %s", path, err);
+    reply_with_error ("%s: %s", path, err);
     free (out);
     free (err);
     return -1;
@@ -55,7 +55,7 @@ do_du (const char *path)
   free (err);
 
   if (sscanf (out, "%"SCNi64, &rv) != 1) {
-    reply_with_error ("du: %s: could not read output: %s", path, out);
+    reply_with_error ("%s: could not read output: %s", path, out);
     free (out);
     return -1;
   }
diff --git a/daemon/ext2.c b/daemon/ext2.c
index f46bac9..85ddce5 100644
--- a/daemon/ext2.c
+++ b/daemon/ext2.c
@@ -39,7 +39,7 @@ do_tune2fs_l (const char *device)
 
   r = command (&out, &err, "/sbin/tune2fs", "-l", device, NULL);
   if (r == -1) {
-    reply_with_error ("tune2fs: %s", err);
+    reply_with_error ("%s", err);
     free (err);
     free (out);
     return NULL;
@@ -53,7 +53,7 @@ do_tune2fs_l (const char *device)
     p = strchr (p, '\n');
     if (p) p++;
     else {
-      reply_with_error ("tune2fs: truncated output");
+      reply_with_error ("truncated output");
       free (out);
       return NULL;
     }
@@ -123,7 +123,7 @@ do_set_e2label (const char *device, const char *label)
 
   r = command (NULL, &err, "/sbin/e2label", device, label, NULL);
   if (r == -1) {
-    reply_with_error ("e2label: %s", err);
+    reply_with_error ("%s", err);
     free (err);
     return -1;
   }
@@ -140,7 +140,7 @@ do_get_e2label (const char *device)
 
   r = command (&out, &err, "/sbin/e2label", device, NULL);
   if (r == -1) {
-    reply_with_error ("e2label: %s", err);
+    reply_with_error ("%s", err);
     free (out);
     free (err);
     return NULL;
@@ -164,7 +164,7 @@ do_set_e2uuid (const char *device, const char *uuid)
 
   r = command (NULL, &err, "/sbin/tune2fs", "-U", uuid, device, NULL);
   if (r == -1) {
-    reply_with_error ("tune2fs -U: %s", err);
+    reply_with_error ("%s", err);
     free (err);
     return -1;
   }
@@ -186,7 +186,7 @@ do_get_e2uuid (const char *device)
 
   r = command (&out, &err, "/sbin/tune2fs", "-l", device, NULL);
   if (r == -1) {
-    reply_with_error ("tune2fs -l: %s", err);
+    reply_with_error ("%s", err);
     free (out);
     free (err);
     return NULL;
@@ -242,7 +242,7 @@ do_resize2fs (const char *device)
 
   r = command (NULL, &err, "/sbin/resize2fs", device, NULL);
   if (r == -1) {
-    reply_with_error ("resize2fs: %s", err);
+    reply_with_error ("%s", err);
     free (err);
     return -1;
   }
@@ -259,7 +259,7 @@ do_e2fsck_f (const char *device)
 
   r = command (NULL, &err, "/sbin/e2fsck", "-p", "-f", device, NULL);
   if (r == -1) {
-    reply_with_error ("e2fsck: %s", err);
+    reply_with_error ("%s", err);
     free (err);
     return -1;
   }
@@ -281,7 +281,7 @@ do_mke2journal (int blocksize, const char *device)
                "/sbin/mke2fs", "-O", "journal_dev", "-b", blocksize_s,
                device, NULL);
   if (r == -1) {
-    reply_with_error ("mke2journal: %s", err);
+    reply_with_error ("%s", err);
     free (err);
     return -1;
   }
@@ -304,7 +304,7 @@ do_mke2journal_L (int blocksize, const char *label, const char *device)
                "-L", label,
                device, NULL);
   if (r == -1) {
-    reply_with_error ("mke2journal_L: %s", err);
+    reply_with_error ("%s", err);
     free (err);
     return -1;
   }
@@ -327,7 +327,7 @@ do_mke2journal_U (int blocksize, const char *uuid, const char *device)
                "-U", uuid,
                device, NULL);
   if (r == -1) {
-    reply_with_error ("mke2journal_U: %s", err);
+    reply_with_error ("%s", err);
     free (err);
     return -1;
   }
@@ -366,7 +366,7 @@ get_mke2fs (void)
     if (access (progs[i], F_OK) == 0)
       return progs[i];
 
-  reply_with_error ("mke2fs: no mke2fs binary found in appliance");
+  reply_with_error ("no mke2fs binary found in appliance");
   return NULL;
 }
 
@@ -391,7 +391,7 @@ do_mke2fs_J (const char *fstype, int blocksize, const char *device,
                prog, "-t", fstype, "-J", jdev, "-b", blocksize_s,
                device, NULL);
   if (r == -1) {
-    reply_with_error ("mke2fs_J: %s", err);
+    reply_with_error ("%s", err);
     free (err);
     return -1;
   }
@@ -421,7 +421,7 @@ do_mke2fs_JL (const char *fstype, int blocksize, const char *device,
                prog, "-t", fstype, "-J", jdev, "-b", blocksize_s,
                device, NULL);
   if (r == -1) {
-    reply_with_error ("mke2fs_JL: %s", err);
+    reply_with_error ("%s", err);
     free (err);
     return -1;
   }
@@ -451,7 +451,7 @@ do_mke2fs_JU (const char *fstype, int blocksize, const char *device,
                prog, "-t", fstype, "-J", jdev, "-b", blocksize_s,
                device, NULL);
   if (r == -1) {
-    reply_with_error ("mke2fs_JU: %s", err);
+    reply_with_error ("%s", err);
     free (err);
     return -1;
   }
diff --git a/daemon/fallocate.c b/daemon/fallocate.c
index 1800292..7f17f8b 100644
--- a/daemon/fallocate.c
+++ b/daemon/fallocate.c
@@ -36,7 +36,7 @@ do_fallocate (const char *path, int len)
   fd = open (path, O_WRONLY | O_CREAT | O_TRUNC | O_NOCTTY, 0666);
   CHROOT_OUT;
   if (fd == -1) {
-    reply_with_perror ("failed to open %s", path);
+    reply_with_perror ("open: %s", path);
     return -1;
   }
 
@@ -45,7 +45,7 @@ do_fallocate (const char *path, int len)
 
   r = posix_fallocate (fd, 0, len);
   if (r == -1) {
-    reply_with_perror ("posix_fallocate: %s", path);
+    reply_with_perror ("%s", path);
     close (fd);
     return -1;
   }
diff --git a/daemon/file.c b/daemon/file.c
index 839713f..dbdbbaa 100644
--- a/daemon/file.c
+++ b/daemon/file.c
@@ -87,7 +87,7 @@ do_cat (const char *path)
     if (size >= alloc) {
       alloc += 8192;
       if (alloc > max) {
-        reply_with_error ("cat: %s: file is too large for message buffer",
+        reply_with_error ("%s: file is too large for message buffer",
                           path);
         free (buf);
         close (fd);
@@ -186,7 +186,7 @@ do_rm (const char *path)
   CHROOT_OUT;
 
   if (r == -1) {
-    reply_with_perror ("unlink: %s", path);
+    reply_with_perror ("%s", path);
     return -1;
   }
 
@@ -203,7 +203,7 @@ do_chmod (int mode, const char *path)
   CHROOT_OUT;
 
   if (r == -1) {
-    reply_with_perror ("chmod: %s: 0%o", path, mode);
+    reply_with_perror ("%s: 0%o", path, mode);
     return -1;
   }
 
@@ -220,7 +220,7 @@ do_chown (int owner, int group, const char *path)
   CHROOT_OUT;
 
   if (r == -1) {
-    reply_with_perror ("chown: %s: %d.%d", path, owner, group);
+    reply_with_perror ("%s: %d.%d", path, owner, group);
     return -1;
   }
 
@@ -237,7 +237,7 @@ do_lchown (int owner, int group, const char *path)
   CHROOT_OUT;
 
   if (r == -1) {
-    reply_with_perror ("lchown: %s: %d.%d", path, owner, group);
+    reply_with_perror ("%s: %d.%d", path, owner, group);
     return -1;
   }
 
@@ -338,7 +338,7 @@ do_read_file (const char *path, size_t *size_r)
    * be caught later when we try to serialize the message.
    */
   if (*size_r >= GUESTFS_MESSAGE_MAX) {
-    reply_with_error ("read_file: %s: file is too large for the protocol, use guestfs_download instead", path);
+    reply_with_error ("%s: file is too large for the protocol, use guestfs_download instead", path);
     close (fd);
     return NULL;
   }
@@ -378,7 +378,7 @@ do_pread (const char *path, int count, int64_t offset, size_t *size_r)
    * will be caught later when we try to serialize the message.
    */
   if (count >= GUESTFS_MESSAGE_MAX) {
-    reply_with_error ("pread: %s: count is too large for the protocol, use smaller reads", path);
+    reply_with_error ("%s: count is too large for the protocol, use smaller reads", path);
     return NULL;
   }
 
@@ -453,7 +453,7 @@ do_file (const char *path)
 
   if (r == -1) {
     free (out);
-    reply_with_error ("file: %s: %s", path, err);
+    reply_with_error ("%s: %s", path, err);
     free (err);
     return NULL;
   }
@@ -482,7 +482,7 @@ do_zfile (const char *method, const char *path)
   else if (STREQ (method, "bzip2"))
     zcat = "bzcat";
   else {
-    reply_with_error ("zfile: unknown method");
+    reply_with_error ("unknown method");
     return NULL;
   }
 
@@ -504,13 +504,13 @@ do_zfile (const char *method, const char *path)
   free (cmd);
 
   if (fgets (line, sizeof line, fp) == NULL) {
-    reply_with_perror ("zfile: fgets");
+    reply_with_perror ("fgets");
     fclose (fp);
     return NULL;
   }
 
   if (fclose (fp) == -1) {
-    reply_with_perror ("zfile: fclose");
+    reply_with_perror ("fclose");
     return NULL;
   }
 
@@ -532,7 +532,7 @@ do_filesize (const char *path)
   CHROOT_OUT;
 
   if (r == -1) {
-    reply_with_perror ("filesize: %s", path);
+    reply_with_perror ("%s", path);
     return -1;
   }
 
diff --git a/daemon/fill.c b/daemon/fill.c
index 9551502..5a391aa 100644
--- a/daemon/fill.c
+++ b/daemon/fill.c
@@ -38,12 +38,12 @@ do_fill (int c, int len, const char *path)
   char buf[BUFSIZ];
 
   if (c < 0 || c > 255) {
-    reply_with_error ("fill: %d: byte number must be in range 0..255", c);
+    reply_with_error ("%d: byte number must be in range 0..255", c);
     return -1;
   }
   memset (buf, c, BUFSIZ);
   if (len < 0) {
-    reply_with_error ("fill: %d: length is < 0", len);
+    reply_with_error ("%d: length is < 0", len);
     return -1;
   }
   len_sz = (size_t) len;
diff --git a/daemon/find.c b/daemon/find.c
index 391b87b..535e46f 100644
--- a/daemon/find.c
+++ b/daemon/find.c
@@ -114,7 +114,7 @@ do_find (const char *dir)
     }
   }
   if (pclose (fp) != 0) {
-    reply_with_perror ("pclose: find");
+    reply_with_perror ("pclose");
     free_stringslen (res, size);
     return NULL;
   }
diff --git a/daemon/fsck.c b/daemon/fsck.c
index 7139094..932f1c5 100644
--- a/daemon/fsck.c
+++ b/daemon/fsck.c
@@ -34,7 +34,7 @@ do_fsck (const char *fstype, const char *device)
 
   r = commandr (NULL, &err, "/sbin/fsck", "-a", "-t", fstype, device, NULL);
   if (r == -1) {
-    reply_with_error ("fsck: %s: %s", device, err);
+    reply_with_error ("%s: %s", device, err);
     free (err);
     return -1;
   }
diff --git a/daemon/glob.c b/daemon/glob.c
index 4fe76f3..e94e4aa 100644
--- a/daemon/glob.c
+++ b/daemon/glob.c
@@ -46,7 +46,7 @@ do_glob_expand (const char *pattern)
 
   if (r != 0) {
     if (errno != 0)
-      reply_with_perror ("glob: %s", pattern);
+      reply_with_perror ("%s", pattern);
     else
       reply_with_error ("glob failed: %s", pattern);
     return NULL;
diff --git a/daemon/grub.c b/daemon/grub.c
index 657abbb..579cc6b 100644
--- a/daemon/grub.c
+++ b/daemon/grub.c
@@ -41,7 +41,7 @@ do_grub_install (const char *root, const char *device)
   free (buf);
 
   if (r == -1) {
-    reply_with_error ("grub-install: %s", err);
+    reply_with_error ("%s", err);
     free (err);
     return -1;
   }
diff --git a/daemon/hexdump.c b/daemon/hexdump.c
index 7016faf..1b33eeb 100644
--- a/daemon/hexdump.c
+++ b/daemon/hexdump.c
@@ -41,7 +41,7 @@ do_hexdump (const char *path)
   r = command (&out, &err, "hexdump", "-C", buf, NULL);
   free (buf);
   if (r == -1) {
-    reply_with_error ("hexdump: %s: %s", path, err);
+    reply_with_error ("%s: %s", path, err);
     free (err);
     free (out);
     return NULL;
diff --git a/daemon/initrd.c b/daemon/initrd.c
index 5e73d40..addeb14 100644
--- a/daemon/initrd.c
+++ b/daemon/initrd.c
@@ -149,7 +149,7 @@ do_initrd_cat (const char *path, const char *filename, size_t *size_r)
    * be caught later when we try to serialize the message.
    */
   if (*size_r >= GUESTFS_MESSAGE_MAX) {
-    reply_with_error ("initrd_cat: %s:%s: file is too large for the protocol",
+    reply_with_error ("%s:%s: file is too large for the protocol",
                       path, filename);
     goto cleanup;
   }
diff --git a/daemon/inotify.c b/daemon/inotify.c
index 24ce76e..ec3aa64 100644
--- a/daemon/inotify.c
+++ b/daemon/inotify.c
@@ -73,7 +73,7 @@ do_inotify_init (int max_events)
   NEED_ROOT (return -1);
 
   if (max_events < 0) {
-    reply_with_error ("inotify_init: max_events < 0");
+    reply_with_error ("max_events < 0");
     return -1;
   }
 
@@ -94,7 +94,7 @@ do_inotify_init (int max_events)
 #ifdef HAVE_INOTIFY_INIT1
   inotify_fd = inotify_init1 (IN_NONBLOCK | IN_CLOEXEC);
   if (inotify_fd == -1) {
-    reply_with_perror ("inotify_init");
+    reply_with_perror ("inotify_init1");
     return -1;
   }
 #else
@@ -130,7 +130,7 @@ do_inotify_close (void)
   NEED_INOTIFY (-1);
 
   if (inotify_fd == -1) {
-    reply_with_error ("inotify_close: handle is not open");
+    reply_with_error ("handle is not open");
     return -1;
   }
 
@@ -166,7 +166,7 @@ do_inotify_add_watch (const char *path, int mask)
   r = inotify_add_watch (inotify_fd, buf, mask);
   free (buf);
   if (r == -1) {
-    reply_with_perror ("inotify_add_watch: %s", path);
+    reply_with_perror ("%s", path);
     return -1;
   }
 
@@ -183,7 +183,7 @@ do_inotify_rm_watch (int wd)
   NEED_INOTIFY (-1);
 
   if (inotify_rm_watch (inotify_fd, wd) == -1) {
-    reply_with_perror ("inotify_rm_watch: %d", wd);
+    reply_with_perror ("%d", wd);
     return -1;
   }
 
@@ -230,7 +230,7 @@ do_inotify_read (void)
       goto error;
     }
     if (r == 0) {		/* End of file - we're not expecting it. */
-      reply_with_error ("inotify_read: unexpected end of file");
+      reply_with_error ("unexpected end of file");
       goto error;
     }
 
diff --git a/daemon/link.c b/daemon/link.c
index 5ea0d39..3766d8c 100644
--- a/daemon/link.c
+++ b/daemon/link.c
@@ -68,7 +68,7 @@ do_readlinklist (const char *path, char *const *names)
   CHROOT_OUT;
 
   if (fd_cwd == -1) {
-    reply_with_perror ("readlinklist: %s", path);
+    reply_with_perror ("open: %s", path);
     return NULL;
   }
 
diff --git a/daemon/lvm.c b/daemon/lvm.c
index 7a05a54..b100cd3 100644
--- a/daemon/lvm.c
+++ b/daemon/lvm.c
@@ -270,7 +270,7 @@ do_lvresize (const char *logvol, int mbytes)
                "/sbin/lvm", "lvresize",
                "-L", size, logvol, NULL);
   if (r == -1) {
-    reply_with_error ("lvresize: %s", err);
+    reply_with_error ("%s", err);
     free (err);
     return -1;
   }
@@ -418,7 +418,7 @@ do_pvresize (const char *device)
   r = command (NULL, &err,
                "/sbin/lvm", "pvresize", device, NULL);
   if (r == -1) {
-    reply_with_error ("pvresize: %s: %s", device, err);
+    reply_with_error ("%s: %s", device, err);
     free (err);
     return -1;
   }
@@ -479,7 +479,7 @@ do_lvrename (const char *logvol, const char *newlogvol)
                "/sbin/lvm", "lvrename",
                logvol, newlogvol, NULL);
   if (r == -1) {
-    reply_with_error ("lvrename: %s -> %s: %s", logvol, newlogvol, err);
+    reply_with_error ("%s -> %s: %s", logvol, newlogvol, err);
     free (err);
     return -1;
   }
@@ -501,7 +501,7 @@ do_vgrename (const char *volgroup, const char *newvolgroup)
                "/sbin/lvm", "vgrename",
                volgroup, newvolgroup, NULL);
   if (r == -1) {
-    reply_with_error ("vgrename: %s -> %s: %s", volgroup, newvolgroup, err);
+    reply_with_error ("%s -> %s: %s", volgroup, newvolgroup, err);
     free (err);
     return -1;
   }
diff --git a/daemon/mkfs.c b/daemon/mkfs.c
index ba245b3..2beb82a 100644
--- a/daemon/mkfs.c
+++ b/daemon/mkfs.c
@@ -83,7 +83,7 @@ mkfs (const char *fstype, const char *device,
 
   r = commandv (NULL, &err, argv);
   if (r == -1) {
-    reply_with_error ("mkfs: %s: %s: %s", fstype, device, err);
+    reply_with_error ("%s: %s: %s", fstype, device, err);
     free (err);
     return -1;
   }
diff --git a/daemon/mknod.c b/daemon/mknod.c
index 46a1839..50865a6 100644
--- a/daemon/mknod.c
+++ b/daemon/mknod.c
@@ -56,7 +56,7 @@ do_mknod (int mode, int devmajor, int devminor, const char *path)
   CHROOT_OUT;
 
   if (r == -1) {
-    reply_with_perror ("mknod: %s", path);
+    reply_with_perror ("%s", path);
     return -1;
   }
 
diff --git a/daemon/mount.c b/daemon/mount.c
index 49a0eab..838bef8 100644
--- a/daemon/mount.c
+++ b/daemon/mount.c
@@ -53,7 +53,7 @@ do_mount_vfs (const char *options, const char *vfstype,
   is_root = STREQ (mountpoint, "/");
 
   if (!root_mounted && !is_root) {
-    reply_with_error ("mount: you must mount something on / first");
+    reply_with_error ("you must mount something on / first");
     return -1;
   }
 
@@ -71,7 +71,7 @@ do_mount_vfs (const char *options, const char *vfstype,
                  "mount", "-o", options, device, mp, NULL);
   free (mp);
   if (r == -1) {
-    reply_with_error ("mount: %s on %s: %s", device, mountpoint, error);
+    reply_with_error ("%s on %s: %s", device, mountpoint, error);
     free (error);
     return -1;
   }
@@ -127,7 +127,7 @@ do_umount (const char *pathordevice)
   free (buf);
 
   if (r == -1) {
-    reply_with_error ("umount: %s: %s", pathordevice, err);
+    reply_with_error ("%s: %s", pathordevice, err);
     free (err);
     return -1;
   }
@@ -338,7 +338,7 @@ do_mount_loop (const char *file, const char *mountpoint)
   free (mp);
   free (buf);
   if (r == -1) {
-    reply_with_error ("mount: %s on %s: %s", file, mountpoint, error);
+    reply_with_error ("%s on %s: %s", file, mountpoint, error);
     free (error);
     return -1;
   }
@@ -363,7 +363,7 @@ do_mkmountpoint (const char *path)
   CHROOT_OUT;
 
   if (r == -1) {
-    reply_with_perror ("mkmountpoint: %s", path);
+    reply_with_perror ("%s", path);
     return -1;
   }
 
@@ -388,7 +388,7 @@ do_rmmountpoint (const char *path)
   CHROOT_OUT;
 
   if (r == -1) {
-    reply_with_perror ("rmmountpoint: %s", path);
+    reply_with_perror ("%s", path);
     return -1;
   }
 
diff --git a/daemon/ntfs.c b/daemon/ntfs.c
index b353008..73ccbbc 100644
--- a/daemon/ntfs.c
+++ b/daemon/ntfs.c
@@ -45,7 +45,7 @@ do_ntfs_3g_probe (int rw, const char *device)
 
   r = commandr (NULL, &err, "ntfs-3g.probe", rw_flag, device, NULL);
   if (r == -1) {
-    reply_with_error ("ntfs-3g.probe: %s: %s", device, err);
+    reply_with_error ("%s: %s", device, err);
     free (err);
     return -1;
   }
diff --git a/daemon/parted.c b/daemon/parted.c
index 2b0df44..3b656bc 100644
--- a/daemon/parted.c
+++ b/daemon/parted.c
@@ -103,7 +103,7 @@ do_part_init (const char *device, const char *parttype)
 {
   parttype = check_parttype (parttype);
   if (!parttype) {
-    reply_with_error ("part-init: unknown partition type: common choices are \"gpt\" and \"msdos\"");
+    reply_with_error ("unknown partition type: common choices are \"gpt\" and \"msdos\"");
     return -1;
   }
 
@@ -133,12 +133,12 @@ do_part_add (const char *device, const char *prlogex,
   else if (STREQ (prlogex, "e"))
     prlogex = "extended";
   else {
-    reply_with_error ("part-add: unknown partition type: %s: this should be \"primary\", \"logical\" or \"extended\"", prlogex);
+    reply_with_error ("unknown partition type: %s: this should be \"primary\", \"logical\" or \"extended\"", prlogex);
     return -1;
   }
 
   if (startsect < 0) {
-    reply_with_error ("part-add: startsect cannot be negative");
+    reply_with_error ("startsect cannot be negative");
     return -1;
   }
   /* but endsect can be negative */
@@ -166,7 +166,7 @@ do_part_disk (const char *device, const char *parttype)
 
   parttype = check_parttype (parttype);
   if (!parttype) {
-    reply_with_error ("part-disk: unknown partition type: common choices are \"gpt\" and \"msdos\"");
+    reply_with_error ("unknown partition type: common choices are \"gpt\" and \"msdos\"");
     return -1;
   }
 
@@ -249,14 +249,14 @@ print_partition_table (const char *device)
     return NULL;
 
   if (lines[0] == NULL || STRNEQ (lines[0], "BYT;")) {
-    reply_with_error ("parted print: unknown signature, expected \"BYT;\" as first line of the output: %s",
+    reply_with_error ("unknown signature, expected \"BYT;\" as first line of the output: %s",
                       lines[0] ? lines[0] : "(signature was null)");
     free_strings (lines);
     return NULL;
   }
 
   if (lines[1] == NULL) {
-    reply_with_error ("parted print: parted didn't return a line describing the device");
+    reply_with_error ("parted didn't return a line describing the device");
     free_strings (lines);
     return NULL;
   }
@@ -284,7 +284,7 @@ do_part_get_parttype (const char *device)
       || strtok (NULL, ":") == NULL  /* physical sector size */
       || (r = strtok (NULL, ":")) == NULL /* return value */
       ) {
-    reply_with_error ("part_get_parttype: too few fields in output from parted print command: %s", lines[1]);
+    reply_with_error ("too few fields in output from parted print command: %s", lines[1]);
     free_strings (lines);
     return NULL;
   }
@@ -339,7 +339,7 @@ do_part_list (const char *device)
                 &r->guestfs_int_partition_list_val[i].part_start,
                 &r->guestfs_int_partition_list_val[i].part_end,
                 &r->guestfs_int_partition_list_val[i].part_size) != 4) {
-      reply_with_error ("part_list: could not parse row from output of parted print command: %s", lines[row]);
+      reply_with_error ("could not parse row from output of parted print command: %s", lines[row]);
       goto error3;
     }
   }
diff --git a/daemon/realpath.c b/daemon/realpath.c
index e6c81ef..89f7737 100644
--- a/daemon/realpath.c
+++ b/daemon/realpath.c
@@ -56,7 +56,7 @@ do_realpath (const char *path)
   ret = realpath (path, NULL);
   CHROOT_OUT;
   if (ret == NULL) {
-    reply_with_perror ("realpath");
+    reply_with_perror ("%s", path);
     return NULL;
   }
 
@@ -98,11 +98,11 @@ do_case_sensitive_path (const char *path)
 
     if ((i == 1 && path[0] == '.') ||
         (i == 2 && path[0] == '.' && path[1] == '.')) {
-      reply_with_error ("case_sensitive_path: path contained . or .. elements");
+      reply_with_error ("path contained . or .. elements");
       goto error;
     }
     if (i > NAME_MAX) {
-      reply_with_error ("case_sensitive_path: path element too long");
+      reply_with_error ("path element too long");
       goto error;
     }
 
diff --git a/daemon/scrub.c b/daemon/scrub.c
index e37a1e1..08c6d47 100644
--- a/daemon/scrub.c
+++ b/daemon/scrub.c
@@ -43,7 +43,7 @@ do_scrub_device (const char *device)
 
   r = command (NULL, &err, "scrub", device, NULL);
   if (r == -1) {
-    reply_with_error ("scrub_device: %s: %s", device, err);
+    reply_with_error ("%s: %s", device, err);
     free (err);
     return -1;
   }
@@ -70,7 +70,7 @@ do_scrub_file (const char *file)
   r = command (NULL, &err, "scrub", "-r", buf, NULL);
   free (buf);
   if (r == -1) {
-    reply_with_error ("scrub_file: %s: %s", file, err);
+    reply_with_error ("%s: %s", file, err);
     free (err);
     return -1;
   }
@@ -97,7 +97,7 @@ do_scrub_freespace (const char *dir)
   r = command (NULL, &err, "scrub", "-X", buf, NULL);
   free (buf);
   if (r == -1) {
-    reply_with_error ("scrub_freespace: %s: %s", dir, err);
+    reply_with_error ("%s: %s", dir, err);
     free (err);
     return -1;
   }
diff --git a/daemon/sfdisk.c b/daemon/sfdisk.c
index b68b9f6..14297e7 100644
--- a/daemon/sfdisk.c
+++ b/daemon/sfdisk.c
@@ -124,7 +124,7 @@ sfdisk_flag (const char *device, const char *flag)
 
   r = command (&out, &err, "/sbin/sfdisk", flag, device, NULL);
   if (r == -1) {
-    reply_with_error ("sfdisk: %s: %s", device, err);
+    reply_with_error ("%s: %s", device, err);
     free (out);
     free (err);
     return NULL;
diff --git a/daemon/stat.c b/daemon/stat.c
index 20f4b70..c939e8e 100644
--- a/daemon/stat.c
+++ b/daemon/stat.c
@@ -151,7 +151,7 @@ do_lstatlist (const char *path, char *const *names)
   CHROOT_OUT;
 
   if (path_fd == -1) {
-    reply_with_perror ("lstatlist: %s", path);
+    reply_with_perror ("%s", path);
     free (ret->guestfs_int_stat_list_val);
     free (ret);
     return NULL;
diff --git a/daemon/strings.c b/daemon/strings.c
index d7dc392..4701716 100644
--- a/daemon/strings.c
+++ b/daemon/strings.c
@@ -42,7 +42,7 @@ do_strings_e (const char *encoding, const char *path)
   r = command (&out, &err, "strings", "-e", encoding, buf, NULL);
   free (buf);
   if (r == -1) {
-    reply_with_error ("strings: %s: %s", path, err);
+    reply_with_error ("%s: %s", path, err);
     free (err);
     free (out);
     return NULL;
diff --git a/daemon/swap.c b/daemon/swap.c
index 2d3d9ff..fbeb895 100644
--- a/daemon/swap.c
+++ b/daemon/swap.c
@@ -58,7 +58,7 @@ mkswap (const char *device, const char *flag, const char *value)
     r = command (NULL, &err, "/sbin/mkswap", "-f", flag, value, device, NULL);
 
   if (r == -1) {
-    reply_with_error ("mkswap: %s", err);
+    reply_with_error ("%s", err);
     free (err);
     return -1;
   }
@@ -115,7 +115,7 @@ swaponoff (const char *cmd, const char *flag, const char *value)
     r = command (NULL, &err, cmd, flag, value, NULL);
 
   if (r == -1) {
-    reply_with_error ("%s: %s: %s", cmd, value, err);
+    reply_with_error ("%s: %s", value, err);
     free (err);
     return -1;
   }
diff --git a/daemon/tar.c b/daemon/tar.c
index c3bdcf7..ebcaded 100644
--- a/daemon/tar.c
+++ b/daemon/tar.c
@@ -44,7 +44,7 @@ do_tar_in (const char *dir)
 
   if (!root_mounted || dir[0] != '/') {
     cancel_receive ();
-    reply_with_error ("tar-in: root must be mounted and path must be absolute");
+    reply_with_error ("root must be mounted and path must be absolute");
     return -1;
   }
 
@@ -165,7 +165,7 @@ do_tgz_in (const char *dir)
 
   if (!root_mounted || dir[0] != '/') {
     cancel_receive ();
-    reply_with_error ("tar-in: root must be mounted and path must be absolute");
+    reply_with_error ("root must be mounted and path must be absolute");
     return -1;
   }
 
diff --git a/daemon/upload.c b/daemon/upload.c
index fdb8654..e15eade 100644
--- a/daemon/upload.c
+++ b/daemon/upload.c
@@ -44,7 +44,7 @@ do_upload (const char *filename)
   if (!is_dev) {
     if (!root_mounted || filename[0] != '/') {
       cancel_receive ();
-      reply_with_error ("upload: root must be mounted and path must be absolute");
+      reply_with_error ("root must be mounted and path must be absolute");
       return -1;
     }
   }
diff --git a/daemon/wc.c b/daemon/wc.c
index b64940b..fe27bf1 100644
--- a/daemon/wc.c
+++ b/daemon/wc.c
@@ -60,7 +60,7 @@ wc (const char *flag, const char *path)
 
   /* Parse the number. */
   if (sscanf (out, "%d", &r) != 1) {
-    reply_with_error ("wc: cannot parse number: %s", out);
+    reply_with_error ("cannot parse number: %s", out);
     free (out);
     return -1;
   }
diff --git a/daemon/xattr.c b/daemon/xattr.c
index e58dc7e..6d356fa 100644
--- a/daemon/xattr.c
+++ b/daemon/xattr.c
@@ -52,7 +52,7 @@ do_getxattrs (const char *path)
 #if defined(HAVE_LISTXATTR) && defined(HAVE_GETXATTR)
   return getxattrs (path, listxattr, getxattr);
 #else
-  reply_with_error ("getxattrs: no support for listxattr and getxattr");
+  reply_with_error ("no support for listxattr and getxattr");
   return NULL;
 #endif
 }
@@ -63,7 +63,7 @@ do_lgetxattrs (const char *path)
 #if defined(HAVE_LLISTXATTR) && defined(HAVE_LGETXATTR)
   return getxattrs (path, llistxattr, lgetxattr);
 #else
-  reply_with_error ("lgetxattrs: no support for llistxattr and lgetxattr");
+  reply_with_error ("no support for llistxattr and lgetxattr");
   return NULL;
 #endif
 }
@@ -74,7 +74,7 @@ do_setxattr (const char *xattr, const char *val, int vallen, const char *path)
 #if defined(HAVE_SETXATTR)
   return _setxattr (xattr, val, vallen, path, setxattr);
 #else
-  reply_with_error ("setxattr: no support for setxattr");
+  reply_with_error ("no support for setxattr");
   return -1;
 #endif
 }
@@ -85,7 +85,7 @@ do_lsetxattr (const char *xattr, const char *val, int vallen, const char *path)
 #if defined(HAVE_LSETXATTR)
   return _setxattr (xattr, val, vallen, path, lsetxattr);
 #else
-  reply_with_error ("lsetxattr: no support for lsetxattr");
+  reply_with_error ("no support for lsetxattr");
   return -1;
 #endif
 }
@@ -96,7 +96,7 @@ do_removexattr (const char *xattr, const char *path)
 #if defined(HAVE_REMOVEXATTR)
   return _removexattr (xattr, path, removexattr);
 #else
-  reply_with_error ("removexattr: no support for removexattr");
+  reply_with_error ("no support for removexattr");
   return -1;
 #endif
 }
@@ -107,7 +107,7 @@ do_lremovexattr (const char *xattr, const char *path)
 #if defined(HAVE_LREMOVEXATTR)
   return _removexattr (xattr, path, lremovexattr);
 #else
-  reply_with_error ("lremovexattr: no support for lremovexattr");
+  reply_with_error ("no support for lremovexattr");
   return -1;
 #endif
 }
@@ -127,7 +127,7 @@ getxattrs (const char *path,
   len = listxattr (path, NULL, 0);
   CHROOT_OUT;
   if (len == -1) {
-    reply_with_perror ("listxattr");
+    reply_with_perror ("listxattr: %s", path);
     goto error;
   }
 
@@ -141,7 +141,7 @@ getxattrs (const char *path,
   len = listxattr (path, buf, len);
   CHROOT_OUT;
   if (len == -1) {
-    reply_with_perror ("listxattr");
+    reply_with_perror ("listxattr: %s", path);
     goto error;
   }
 
@@ -266,7 +266,7 @@ do_lxattrlist (const char *path, char *const *names)
   char *buf = NULL;
 
   if (path_len >= PATH_MAX) {
-    reply_with_perror ("lxattrlist: path longer than PATH_MAX");
+    reply_with_perror ("path longer than PATH_MAX");
     goto error;
   }
 
@@ -288,7 +288,7 @@ do_lxattrlist (const char *path, char *const *names)
      * outgoing struct list.
      */
     if (path_len + strlen (names[k]) + 2 > PATH_MAX) {
-      reply_with_perror ("lxattrlist: path and name longer than PATH_MAX");
+      reply_with_perror ("path and name longer than PATH_MAX");
       goto error;
     }
     pathname[path_len] = '/';
@@ -443,7 +443,7 @@ do_lxattrlist (const char *path, char *const *names)
   }
   return NULL;
 #else
-  reply_with_error ("lxattrlist: no support for llistxattr and lgetxattr");
+  reply_with_error ("no support for llistxattr and lgetxattr");
   return NULL;
 #endif
 }
diff --git a/daemon/zerofree.c b/daemon/zerofree.c
index 05a547b..84073dd 100644
--- a/daemon/zerofree.c
+++ b/daemon/zerofree.c
@@ -43,7 +43,7 @@ do_zerofree (const char *device)
 
   r = command (NULL, &err, "/usr/sbin/zerofree", device, NULL);
   if (r == -1) {
-    reply_with_error ("zerofree: %s: %s", device, err);
+    reply_with_error ("%s: %s", device, err);
     free (err);
     return -1;
   }
diff --git a/src/generator.ml b/src/generator.ml
index 9cd588b..6f071ad 100755
--- a/src/generator.ml
+++ b/src/generator.ml
@@ -5810,7 +5810,7 @@ and generate_daemon_actions () =
            pr "  memset (&args, 0, sizeof args);\n";
            pr "\n";
            pr "  if (!xdr_guestfs_%s_args (xdr_in, &args)) {\n" name;
-           pr "    reply_with_error (\"%%s: daemon failed to decode procedure arguments\", \"%s\");\n" name;
+           pr "    reply_with_error (\"daemon failed to decode procedure arguments\");\n";
            pr "    return;\n";
            pr "  }\n";
            let pr_args n =