[Libguestfs] [PATCH v3 3/5] daemon/parted: simplify print_partition_table() prototype

[Laszlo Ersek]

Since commit 994ca1f8ebcc ("daemon: Reimplement 'part_get_mbr_part_type'
API in OCaml.", 2018-05-02), we've not had any calls to
print_partition_table() that would pass a "false" argument for the
"add_m_option" parameter.

Remove the parameter, and inside part_get_mbr_part_type(), remove the dead
branch.

Relatedly, update the comment on the
"print_partition_table_machine_readable" OCaml function, originally from
commit 32e661f42169 ("daemon: Reimplement ‘part_list’ API in OCaml.",
2017-07-27). Because print_partition_table() now passes "-m" to "parted"
unconditionally, and there are no use cases left that would *forbid* "-m",
"print_partition_table_machine_readable" is almost equivalent to
print_partition_table() -- modulo the enforcement of the "BYT;" header.

Signed-off-by: Laszlo Ersek <lersek at redhat.com>
Acked-by: Richard W.M. Jones <rjones at redhat.com>
---

Notes:
    v3:
    
    - pick up Rich's ACK
    
    - correct typo in commit message (the argument that never gets passed as
      the "add_m_option" parameter of print_partition_table() is "false",
      not "true")
    
    v2:
    
    - new patch: unrelated refactoring I'd found possible while working the
      BZ

 daemon/parted.c  | 17 ++++++-----------
 daemon/parted.ml |  6 ++----
 2 files changed, 8 insertions(+), 15 deletions(-)

diff --git a/daemon/parted.c b/daemon/parted.c
index ef7b90056b41..3a723762c345 100644
--- a/daemon/parted.c
+++ b/daemon/parted.c
@@ -341,7 +341,7 @@ get_table_field (const char *line, int n)
 }
 
 static char *
-print_partition_table (const char *device, bool add_m_option)
+print_partition_table (const char *device)
 {
   char *out;
   CLEANUP_FREE char *err = NULL;
@@ -349,14 +349,9 @@ print_partition_table (const char *device, bool add_m_option)
 
   udev_settle ();
 
-  if (add_m_option)
-    r = command (&out, &err, "parted", "-m", "-s", "--", device,
-                 "unit", "b",
-                 "print", NULL);
-  else
-    r = command (&out, &err, "parted", "-s", "--", device,
-                 "unit", "b",
-                 "print", NULL);
+  r = command (&out, &err, "parted", "-m", "-s", "--", device,
+               "unit", "b",
+               "print", NULL);
 
   udev_settle ();
 
@@ -383,7 +378,7 @@ do_part_get_bootable (const char *device, int partnum)
     return -1;
   }
 
-  CLEANUP_FREE char *out = print_partition_table (device, true);
+  CLEANUP_FREE char *out = print_partition_table (device);
   if (!out)
     return -1;
 
@@ -555,7 +550,7 @@ do_part_get_name (const char *device, int partnum)
     return NULL;
 
   if (STREQ (parttype, "gpt")) {
-    CLEANUP_FREE char *out = print_partition_table (device, true);
+    CLEANUP_FREE char *out = print_partition_table (device);
     if (!out)
       return NULL;
 
diff --git a/daemon/parted.ml b/daemon/parted.ml
index 45c387987483..29b98c4806c1 100644
--- a/daemon/parted.ml
+++ b/daemon/parted.ml
@@ -57,10 +57,8 @@ let part_get_mbr_id device partnum =
   (* It's printed in hex, possibly with a leading space. *)
   sscanf out " %x" identity
 
-(* This is not equivalent to print_partition_table in the C code, as
- * it only deals with the ‘-m’ option output, and it partially parses
- * that.  If we convert other functions that don't use the ‘-m’ version
- * we'll have to refactor this. XXX
+(* This is almost equivalent to print_partition_table in the C code. The
+ * difference is that here we enforce the "BYT;" header internally.
  *)
 let print_partition_table_machine_readable device =
   udev_settle ();
-- 
2.19.1.3.g30247aa5d201