* [PATCH 2/4] Add envblk reading/writing functionality to GRUB
@ 2020-02-25 19:26 Paul Dagnelie
2020-03-03 15:08 ` Daniel Kiper
0 siblings, 1 reply; 2+ messages in thread
From: Paul Dagnelie @ 2020-02-25 19:26 UTC (permalink / raw)
To: Grub-devel
Cc: Daniel Kiper, Brian Behlendorf, Matthew Ahrens, George Wilson,
Sebastien Roy, javierm, maciej.pijanowski, piotr.krol
We leverage the grub envblk file and fs functions to read from and
write to the envblk. We also tweak the editenv code by factoring out
the logic that creates the buffer with the envblk contents so it can
be reused.
We also add the grubenv_src variable, which can be used to force grub
to load the grubenv file from a file or from the envblk even if it
would not automatically choose to do so.
commit d9e66e27592ad83f4a90d0e231a9ffc679617cae
Author: Paul Dagnelie <pcd@delphix.com>
AuthorDate: Mon Feb 24 13:40:55 2020 -0800
Commit: Paul Dagnelie <pcd@delphix.com>
CommitDate: Tue Feb 25 10:08:07 2020 -0800
Use envblk file and fs functions to implement reading the grubenv
file from special FS regions
---
grub-core/commands/loadenv.c | 122 +++++++++++++++++++++++++++++++++++++------
include/grub/lib/envblk.h | 2 +
include/grub/util/install.h | 3 ++
util/editenv.c | 26 +++++----
4 files changed, 129 insertions(+), 24 deletions(-)
diff --git a/grub-core/commands/loadenv.c b/grub-core/commands/loadenv.c
index 3fd664aac..0f20543a3 100644
--- a/grub-core/commands/loadenv.c
+++ b/grub-core/commands/loadenv.c
@@ -79,6 +79,94 @@ open_envblk_file (char *filename,
return file;
}
+static grub_file_t
+open_envblk_block (grub_fs_t fs, grub_device_t dev, enum grub_file_type type)
+{
+ if (!fs->fs_envblk_open)
+ return NULL;
+ return grub_file_envblk_open(fs, dev, type);
+}
+
+static grub_file_t
+open_envblk (grub_extcmd_context_t ctxt, enum grub_file_type type)
+{
+ struct grub_arg_list *state = ctxt->state;
+ grub_file_t file = NULL;
+ grub_device_t device = NULL;
+ const char *source;
+ grub_fs_t fs = NULL;
+ char *filename = state[0].set ? state[0].arg : NULL;
+
+ source = grub_env_get ("grubenv_src");
+ if (! source || ! grub_strcmp (source, GRUB_ENVBLK_SRCBLK))
+ {
+ grub_dprintf ("loadenv", "checking for envblk\n");
+ char *device_name;
+ const char *prefix;
+
+ prefix = grub_env_get ("prefix");
+ if (! prefix)
+ {
+ grub_error (GRUB_ERR_FILE_NOT_FOUND, N_("variable `%s'
isn't set"), "prefix");
+ return NULL;
+ }
+
+ device_name = grub_file_get_device_name (prefix);
+ if (grub_errno)
+ return NULL;
+
+ device = grub_device_open (device_name);
+ if (! device)
+ return NULL;
+
+ fs = grub_fs_probe (device);
+ if (! fs) {
+ grub_device_close (device);
+ return NULL;
+ }
+
+ /* We have to reopen the device here because it will be closed
in grub_fs_probe. */
+ device = grub_device_open (device_name);
+ grub_free (device_name);
+ if (! device)
+ return NULL;
+
+ }
+ if (! source)
+ {
+ if (fs->fs_envblk_open)
+ {
+ source = GRUB_ENVBLK_SRCBLK;
+ grub_dprintf ("loadenv", "envblk support detected\n");
+ }
+ else
+ {
+ source = GRUB_ENVBLK_SRCFILE;
+ grub_dprintf ("loadenv", "envblk support not detected\n");
+ }
+ }
+
+ if (! grub_strcmp (source, GRUB_ENVBLK_SRCFILE))
+ {
+ if (device)
+ grub_device_close (device);
+ file = open_envblk_file (filename, type);
+
+ if (! file)
+ return NULL;
+ }
+ else if (! grub_strcmp (source, GRUB_ENVBLK_SRCBLK))
+ {
+ file = open_envblk_block (fs, device, type);
+ if (! file)
+ {
+ grub_device_close (device);
+ return NULL;
+ }
+ }
+ return file;
+}
+
static grub_envblk_t
read_envblk_file (grub_file_t file)
{
@@ -165,11 +253,10 @@ grub_cmd_load_env (grub_extcmd_context_t ctxt,
int argc, char **args)
whitelist.len = argc;
whitelist.list = args;
- /* state[0] is the -f flag; state[1] is the --skip-sig flag */
- file = open_envblk_file ((state[0].set) ? state[0].arg : 0,
- GRUB_FILE_TYPE_LOADENV
- | (state[1].set
- ? GRUB_FILE_TYPE_SKIP_SIGNATURE : GRUB_FILE_TYPE_NONE));
+ file = open_envblk (ctxt, GRUB_FILE_TYPE_LOADENV
+ | (state[1].set
+ ? GRUB_FILE_TYPE_SKIP_SIGNATURE :
+ GRUB_FILE_TYPE_NONE));
if (! file)
return grub_errno;
@@ -204,10 +291,9 @@ grub_cmd_list_env (grub_extcmd_context_t ctxt,
grub_file_t file;
grub_envblk_t envblk;
- file = open_envblk_file ((state[0].set) ? state[0].arg : 0,
- GRUB_FILE_TYPE_LOADENV
- | (state[1].set
- ? GRUB_FILE_TYPE_SKIP_SIGNATURE : GRUB_FILE_TYPE_NONE));
+ file = open_envblk (ctxt, GRUB_FILE_TYPE_LOADENV
+ | (state[1].set
+ ? GRUB_FILE_TYPE_SKIP_SIGNATURE : GRUB_FILE_TYPE_NONE));
if (! file)
return grub_errno;
@@ -379,7 +465,6 @@ save_env_read_hook (grub_disk_addr_t sector,
unsigned offset, unsigned length,
static grub_err_t
grub_cmd_save_env (grub_extcmd_context_t ctxt, int argc, char **args)
{
- struct grub_arg_list *state = ctxt->state;
grub_file_t file;
grub_envblk_t envblk;
struct grub_cmd_save_env_ctx ctx = {
@@ -390,9 +475,8 @@ grub_cmd_save_env (grub_extcmd_context_t ctxt, int
argc, char **args)
if (! argc)
return grub_error (GRUB_ERR_BAD_ARGUMENT, "no variable is specified");
- file = open_envblk_file ((state[0].set) ? state[0].arg : 0,
- GRUB_FILE_TYPE_SAVEENV
- | GRUB_FILE_TYPE_SKIP_SIGNATURE);
+ file = open_envblk (ctxt, GRUB_FILE_TYPE_SAVEENV
+ | GRUB_FILE_TYPE_SKIP_SIGNATURE);
if (! file)
return grub_errno;
@@ -409,7 +493,7 @@ grub_cmd_save_env (grub_extcmd_context_t ctxt, int
argc, char **args)
if (! envblk)
goto fail;
- if (check_blocklists (envblk, ctx.head, file))
+ if (! grub_file_envblk (file) && check_blocklists (envblk, ctx.head, file))
goto fail;
while (argc)
@@ -432,7 +516,15 @@ grub_cmd_save_env (grub_extcmd_context_t ctxt,
int argc, char **args)
args++;
}
- write_blocklists (envblk, ctx.head, file);
+ if (grub_file_envblk (file))
+ {
+ grub_file_seek (file, 0);
+ file->fs->fs_envblk_write (file, grub_envblk_buffer (envblk),
grub_envblk_size (envblk));
+ }
+ else
+ {
+ write_blocklists (envblk, ctx.head, file);
+ }
fail:
if (envblk)
diff --git a/include/grub/lib/envblk.h b/include/grub/lib/envblk.h
index c3e655921..7bef0c601 100644
--- a/include/grub/lib/envblk.h
+++ b/include/grub/lib/envblk.h
@@ -21,6 +21,8 @@
#define GRUB_ENVBLK_SIGNATURE "# GRUB Environment Block\n"
#define GRUB_ENVBLK_DEFCFG "grubenv"
+#define GRUB_ENVBLK_SRCBLK "block"
+#define GRUB_ENVBLK_SRCFILE "file"
#ifndef ASM_FILE
diff --git a/include/grub/util/install.h b/include/grub/util/install.h
index 2631b1074..2ca349503 100644
--- a/include/grub/util/install.h
+++ b/include/grub/util/install.h
@@ -246,6 +246,9 @@ grub_install_get_blocklist (grub_device_t root_dev,
void *data),
void *hook_data);
+void
+grub_util_create_envblk_buffer (char *, size_t);
+
void
grub_util_create_envblk_file (const char *name);
diff --git a/util/editenv.c b/util/editenv.c
index 81f68bd10..45aeba259 100644
--- a/util/editenv.c
+++ b/util/editenv.c
@@ -32,13 +32,29 @@
#define DEFAULT_ENVBLK_SIZE 1024
#define GRUB_ENVBLK_MESSAGE "# WARNING: Do not edit this file by
tools other than "PACKAGE"-editenv!!!\n"
+void
+grub_util_create_envblk_buffer (char *buf, size_t size)
+{
+ if (size < DEFAULT_ENVBLK_SIZE)
+ grub_util_error (_("Envblock buffer too small"));
+ char *pbuf;
+ pbuf = buf;
+ memcpy (pbuf, GRUB_ENVBLK_SIGNATURE, sizeof (GRUB_ENVBLK_SIGNATURE) - 1);
+ pbuf += sizeof (GRUB_ENVBLK_SIGNATURE) - 1;
+ memcpy (pbuf, GRUB_ENVBLK_MESSAGE, sizeof (GRUB_ENVBLK_MESSAGE) - 1);
+ pbuf += sizeof (GRUB_ENVBLK_MESSAGE) - 1;
+ memset (pbuf , '#',
+ size - sizeof (GRUB_ENVBLK_SIGNATURE) - sizeof
(GRUB_ENVBLK_MESSAGE) + 2);
+}
+
void
grub_util_create_envblk_file (const char *name)
{
FILE *fp;
- char *buf, *pbuf, *namenew;
+ char *buf, *namenew;
buf = xmalloc (DEFAULT_ENVBLK_SIZE);
+ grub_util_create_envblk_buffer(buf, DEFAULT_ENVBLK_SIZE);
namenew = xasprintf ("%s.new", name);
fp = grub_util_fopen (namenew, "wb");
@@ -46,14 +62,6 @@ grub_util_create_envblk_file (const char *name)
grub_util_error (_("cannot open `%s': %s"), namenew,
strerror (errno));
- pbuf = buf;
- memcpy (pbuf, GRUB_ENVBLK_SIGNATURE, sizeof (GRUB_ENVBLK_SIGNATURE) - 1);
- pbuf += sizeof (GRUB_ENVBLK_SIGNATURE) - 1;
- memcpy (pbuf, GRUB_ENVBLK_MESSAGE, sizeof (GRUB_ENVBLK_MESSAGE) - 1);
- pbuf += sizeof (GRUB_ENVBLK_MESSAGE) - 1;
- memset (pbuf , '#',
- DEFAULT_ENVBLK_SIZE - sizeof (GRUB_ENVBLK_SIGNATURE) -
sizeof (GRUB_ENVBLK_MESSAGE) + 2);
-
if (fwrite (buf, 1, DEFAULT_ENVBLK_SIZE, fp) != DEFAULT_ENVBLK_SIZE)
grub_util_error (_("cannot write to `%s': %s"), namenew,
strerror (errno));
--
Paul Dagnelie
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH 2/4] Add envblk reading/writing functionality to GRUB
2020-02-25 19:26 [PATCH 2/4] Add envblk reading/writing functionality to GRUB Paul Dagnelie
@ 2020-03-03 15:08 ` Daniel Kiper
0 siblings, 0 replies; 2+ messages in thread
From: Daniel Kiper @ 2020-03-03 15:08 UTC (permalink / raw)
To: Paul Dagnelie
Cc: Grub-devel, Brian Behlendorf, Matthew Ahrens, George Wilson,
Sebastien Roy, javierm, maciej.pijanowski, piotr.krol
On Tue, Feb 25, 2020 at 11:26:41AM -0800, Paul Dagnelie wrote:
> We leverage the grub envblk file and fs functions to read from and
> write to the envblk. We also tweak the editenv code by factoring out
> the logic that creates the buffer with the envblk contents so it can
> be reused.
The commit message suggests that we need at least two patches here...
> We also add the grubenv_src variable, which can be used to force grub
> to load the grubenv file from a file or from the envblk even if it
> would not automatically choose to do so.
>
> commit d9e66e27592ad83f4a90d0e231a9ffc679617cae
> Author: Paul Dagnelie <pcd@delphix.com>
> AuthorDate: Mon Feb 24 13:40:55 2020 -0800
> Commit: Paul Dagnelie <pcd@delphix.com>
> CommitDate: Tue Feb 25 10:08:07 2020 -0800
>
> Use envblk file and fs functions to implement reading the grubenv
> file from special FS regions
> ---
> grub-core/commands/loadenv.c | 122 +++++++++++++++++++++++++++++++++++++------
> include/grub/lib/envblk.h | 2 +
> include/grub/util/install.h | 3 ++
> util/editenv.c | 26 +++++----
> 4 files changed, 129 insertions(+), 24 deletions(-)
>
> diff --git a/grub-core/commands/loadenv.c b/grub-core/commands/loadenv.c
> index 3fd664aac..0f20543a3 100644
> --- a/grub-core/commands/loadenv.c
> +++ b/grub-core/commands/loadenv.c
> @@ -79,6 +79,94 @@ open_envblk_file (char *filename,
> return file;
> }
>
> +static grub_file_t
> +open_envblk_block (grub_fs_t fs, grub_device_t dev, enum grub_file_type type)
> +{
> + if (!fs->fs_envblk_open)
> + return NULL;
> + return grub_file_envblk_open(fs, dev, type);
Nit but...
if (fs->fs_envblk_open)
return grub_file_envblk_open (fs, dev, type);
return NULL;
> +}
> +
> +static grub_file_t
> +open_envblk (grub_extcmd_context_t ctxt, enum grub_file_type type)
> +{
> + struct grub_arg_list *state = ctxt->state;
> + grub_file_t file = NULL;
> + grub_device_t device = NULL;
> + const char *source;
> + grub_fs_t fs = NULL;
> + char *filename = state[0].set ? state[0].arg : NULL;
> +
> + source = grub_env_get ("grubenv_src");
> + if (! source || ! grub_strcmp (source, GRUB_ENVBLK_SRCBLK))
> + {
> + grub_dprintf ("loadenv", "checking for envblk\n");
> + char *device_name;
> + const char *prefix;
Please do not mix variable declarations with the code. The former should
precede the latter.
> + prefix = grub_env_get ("prefix");
> + if (! prefix)
> + {
> + grub_error (GRUB_ERR_FILE_NOT_FOUND, N_("variable `%s'
> isn't set"), "prefix");
> + return NULL;
> + }
> +
> + device_name = grub_file_get_device_name (prefix);
> + if (grub_errno)
> + return NULL;
> +
> + device = grub_device_open (device_name);
> + if (! device)
> + return NULL;
> +
> + fs = grub_fs_probe (device);
> + if (! fs) {
> + grub_device_close (device);
> + return NULL;
> + }
> +
> + /* We have to reopen the device here because it will be closed
> in grub_fs_probe. */
s/it will be/it was/?
> + device = grub_device_open (device_name);
> + grub_free (device_name);
> + if (! device)
> + return NULL;
> +
> + }
> + if (! source)
> + {
> + if (fs->fs_envblk_open)
> + {
> + source = GRUB_ENVBLK_SRCBLK;
> + grub_dprintf ("loadenv", "envblk support detected\n");
> + }
> + else
> + {
> + source = GRUB_ENVBLK_SRCFILE;
> + grub_dprintf ("loadenv", "envblk support not detected\n");
> + }
> + }
> +
> + if (! grub_strcmp (source, GRUB_ENVBLK_SRCFILE))
> + {
> + if (device)
> + grub_device_close (device);
> + file = open_envblk_file (filename, type);
> +
> + if (! file)
> + return NULL;
> + }
> + else if (! grub_strcmp (source, GRUB_ENVBLK_SRCBLK))
> + {
> + file = open_envblk_block (fs, device, type);
> + if (! file)
> + {
> + grub_device_close (device);
> + return NULL;
> + }
> + }
> + return file;
> +}
> +
> static grub_envblk_t
> read_envblk_file (grub_file_t file)
> {
> @@ -165,11 +253,10 @@ grub_cmd_load_env (grub_extcmd_context_t ctxt,
> int argc, char **args)
> whitelist.len = argc;
> whitelist.list = args;
>
> - /* state[0] is the -f flag; state[1] is the --skip-sig flag */
> - file = open_envblk_file ((state[0].set) ? state[0].arg : 0,
> - GRUB_FILE_TYPE_LOADENV
> - | (state[1].set
> - ? GRUB_FILE_TYPE_SKIP_SIGNATURE : GRUB_FILE_TYPE_NONE));
> + file = open_envblk (ctxt, GRUB_FILE_TYPE_LOADENV
> + | (state[1].set
> + ? GRUB_FILE_TYPE_SKIP_SIGNATURE :
> + GRUB_FILE_TYPE_NONE));
> if (! file)
> return grub_errno;
>
> @@ -204,10 +291,9 @@ grub_cmd_list_env (grub_extcmd_context_t ctxt,
> grub_file_t file;
> grub_envblk_t envblk;
>
> - file = open_envblk_file ((state[0].set) ? state[0].arg : 0,
> - GRUB_FILE_TYPE_LOADENV
> - | (state[1].set
> - ? GRUB_FILE_TYPE_SKIP_SIGNATURE : GRUB_FILE_TYPE_NONE));
> + file = open_envblk (ctxt, GRUB_FILE_TYPE_LOADENV
> + | (state[1].set
> + ? GRUB_FILE_TYPE_SKIP_SIGNATURE : GRUB_FILE_TYPE_NONE));
> if (! file)
> return grub_errno;
>
> @@ -379,7 +465,6 @@ save_env_read_hook (grub_disk_addr_t sector,
> unsigned offset, unsigned length,
> static grub_err_t
> grub_cmd_save_env (grub_extcmd_context_t ctxt, int argc, char **args)
> {
> - struct grub_arg_list *state = ctxt->state;
> grub_file_t file;
> grub_envblk_t envblk;
> struct grub_cmd_save_env_ctx ctx = {
> @@ -390,9 +475,8 @@ grub_cmd_save_env (grub_extcmd_context_t ctxt, int
> argc, char **args)
> if (! argc)
> return grub_error (GRUB_ERR_BAD_ARGUMENT, "no variable is specified");
>
> - file = open_envblk_file ((state[0].set) ? state[0].arg : 0,
> - GRUB_FILE_TYPE_SAVEENV
> - | GRUB_FILE_TYPE_SKIP_SIGNATURE);
> + file = open_envblk (ctxt, GRUB_FILE_TYPE_SAVEENV
> + | GRUB_FILE_TYPE_SKIP_SIGNATURE);
> if (! file)
> return grub_errno;
>
> @@ -409,7 +493,7 @@ grub_cmd_save_env (grub_extcmd_context_t ctxt, int
> argc, char **args)
> if (! envblk)
> goto fail;
>
> - if (check_blocklists (envblk, ctx.head, file))
> + if (! grub_file_envblk (file) && check_blocklists (envblk, ctx.head, file))
> goto fail;
>
> while (argc)
> @@ -432,7 +516,15 @@ grub_cmd_save_env (grub_extcmd_context_t ctxt,
> int argc, char **args)
> args++;
> }
>
> - write_blocklists (envblk, ctx.head, file);
> + if (grub_file_envblk (file))
> + {
> + grub_file_seek (file, 0);
> + file->fs->fs_envblk_write (file, grub_envblk_buffer (envblk),
> grub_envblk_size (envblk));
> + }
> + else
> + {
> + write_blocklists (envblk, ctx.head, file);
> + }
>
> fail:
> if (envblk)
> diff --git a/include/grub/lib/envblk.h b/include/grub/lib/envblk.h
> index c3e655921..7bef0c601 100644
> --- a/include/grub/lib/envblk.h
> +++ b/include/grub/lib/envblk.h
> @@ -21,6 +21,8 @@
>
> #define GRUB_ENVBLK_SIGNATURE "# GRUB Environment Block\n"
> #define GRUB_ENVBLK_DEFCFG "grubenv"
> +#define GRUB_ENVBLK_SRCBLK "block"
s/GRUB_ENVBLK_SRCBLK/GRUB_ENVBLK_SRC_BLK/g
> +#define GRUB_ENVBLK_SRCFILE "file"
s/GRUB_ENVBLK_SRCFILE/GRUB_ENVBLK_SRC_FILE/g
> #ifndef ASM_FILE
>
> diff --git a/include/grub/util/install.h b/include/grub/util/install.h
> index 2631b1074..2ca349503 100644
> --- a/include/grub/util/install.h
> +++ b/include/grub/util/install.h
> @@ -246,6 +246,9 @@ grub_install_get_blocklist (grub_device_t root_dev,
> void *data),
> void *hook_data);
>
> +void
> +grub_util_create_envblk_buffer (char *, size_t);
> +
> void
> grub_util_create_envblk_file (const char *name);
>
> diff --git a/util/editenv.c b/util/editenv.c
> index 81f68bd10..45aeba259 100644
> --- a/util/editenv.c
> +++ b/util/editenv.c
> @@ -32,13 +32,29 @@
> #define DEFAULT_ENVBLK_SIZE 1024
> #define GRUB_ENVBLK_MESSAGE "# WARNING: Do not edit this file by
> tools other than "PACKAGE"-editenv!!!\n"
>
> +void
> +grub_util_create_envblk_buffer (char *buf, size_t size)
> +{
> + if (size < DEFAULT_ENVBLK_SIZE)
> + grub_util_error (_("Envblock buffer too small"));
> + char *pbuf;
> + pbuf = buf;
> + memcpy (pbuf, GRUB_ENVBLK_SIGNATURE, sizeof (GRUB_ENVBLK_SIGNATURE) - 1);
> + pbuf += sizeof (GRUB_ENVBLK_SIGNATURE) - 1;
> + memcpy (pbuf, GRUB_ENVBLK_MESSAGE, sizeof (GRUB_ENVBLK_MESSAGE) - 1);
> + pbuf += sizeof (GRUB_ENVBLK_MESSAGE) - 1;
> + memset (pbuf , '#',
> + size - sizeof (GRUB_ENVBLK_SIGNATURE) - sizeof
> (GRUB_ENVBLK_MESSAGE) + 2);
> +}
> +
> void
> grub_util_create_envblk_file (const char *name)
> {
> FILE *fp;
> - char *buf, *pbuf, *namenew;
> + char *buf, *namenew;
>
> buf = xmalloc (DEFAULT_ENVBLK_SIZE);
> + grub_util_create_envblk_buffer(buf, DEFAULT_ENVBLK_SIZE);
>
> namenew = xasprintf ("%s.new", name);
> fp = grub_util_fopen (namenew, "wb");
> @@ -46,14 +62,6 @@ grub_util_create_envblk_file (const char *name)
> grub_util_error (_("cannot open `%s': %s"), namenew,
> strerror (errno));
>
> - pbuf = buf;
> - memcpy (pbuf, GRUB_ENVBLK_SIGNATURE, sizeof (GRUB_ENVBLK_SIGNATURE) - 1);
> - pbuf += sizeof (GRUB_ENVBLK_SIGNATURE) - 1;
> - memcpy (pbuf, GRUB_ENVBLK_MESSAGE, sizeof (GRUB_ENVBLK_MESSAGE) - 1);
> - pbuf += sizeof (GRUB_ENVBLK_MESSAGE) - 1;
> - memset (pbuf , '#',
> - DEFAULT_ENVBLK_SIZE - sizeof (GRUB_ENVBLK_SIGNATURE) -
> sizeof (GRUB_ENVBLK_MESSAGE) + 2);
> -
> if (fwrite (buf, 1, DEFAULT_ENVBLK_SIZE, fp) != DEFAULT_ENVBLK_SIZE)
> grub_util_error (_("cannot write to `%s': %s"), namenew,
> strerror (errno));
Please provide util changes in separate patches.
Daniel
^ permalink raw reply [flat|nested] 2+ messages in thread
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2020-02-25 19:26 [PATCH 2/4] Add envblk reading/writing functionality to GRUB Paul Dagnelie
2020-03-03 15:08 ` Daniel Kiper
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