[Libguestfs] [v2v PATCH] convert/convert_linux: complete the remapping of NVMe devices
In commit 75872bf282d7 ("input: -i vmx: Add support for NVMe devices",
2022-04-08), we missed that pathnames such as
/dev/nvme0n1[p1]
would not match our "rex_device_cciss" and "rex_device" regular
expressions.
As a consequence, we don't remap such pathnames now in the boot config
files with Augeas.
Add a new regex and associated mapping logic for this kind of pathname.
Notes:
(1) "rex_device_cciss" could be extended internally with an alternative
pattern:
^/dev/(cciss/c\\d+d\\d+|nvme\\d+n1)(?:p(\\d+))?$
^^^^^^^^^^^
but Rich suggested we should add a separate, complete regexp for
maintainability.
(2) Even with a separate regexp, we could reuse the existent CCISS pattern
handler:
if PCRE.matches rex_device_cciss value ||
PCRE.matches rex_device_nvme value then (
let device = PCRE.sub 1
and part = try PCRE.sub 2 with Not_found -> "" in
"/dev/" ^ replace device ^ part
)
Namely, although "PCRE.matches" creates/updates global state, and
"PCRE.sub" reads that state, the "||" operator in OCaml has
short-circuit
behavior, and both regexps have the same structure.
But, using the same maintainability argument, let's keep the handler logic
for NVMe detached.
Fixes: 75872bf282d7f2322110caca70963717b43806b1
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2101665
Signed-off-by: Laszlo Ersek <lersek(a)redhat.com>
---
convert/convert_linux.ml | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/convert/convert_linux.ml b/convert/convert_linux.ml
index 59d143bdda4b..a66ff1e45a57 100644
--- a/convert/convert_linux.ml
+++ b/convert/convert_linux.ml
@@ -1199,6 +1199,7 @@ let convert (g : G.guestfs) source inspect keep_serial_console _ =
(* Map device names for each entry. *)
let rex_resume = PCRE.compile "^resume=(/dev/[-a-z\\d/_]+)(.*)$"
and rex_device_cciss = PCRE.compile
"^/dev/(cciss/c\\d+d\\d+)(?:p(\\d+))?$"
+ and rex_device_nvme = PCRE.compile "^/dev/(nvme\\d+n1)(?:p(\\d+))?$"
and rex_device = PCRE.compile "^/dev/([a-z]+)(\\d*)?$" in
let rec replace_if_device path value =
@@ -1221,6 +1222,11 @@ let convert (g : G.guestfs) source inspect keep_serial_console _ =
and part = try PCRE.sub 2 with Not_found -> "" in
"/dev/" ^ replace device ^ part
)
+ else if PCRE.matches rex_device_nvme value then (
+ let device = PCRE.sub 1
+ and part = try PCRE.sub 2 with Not_found -> "" in
+ "/dev/" ^ replace device ^ part
+ )
else if PCRE.matches rex_device value then (
let device = PCRE.sub 1
and part = try PCRE.sub 2 with Not_found -> "" in
--
2.19.1.3.g30247aa5d201