[PATCH] commands/hashsum: Allow to store hash in variable

* [PATCH] commands/hashsum: Allow to store hash in variable
@ 2025-10-09 20:34 D.-E. Divernois via Grub-devel
  0 siblings, 0 replies; 2+ messages in thread
From: D.-E. Divernois via Grub-devel @ 2025-10-09 20:34 UTC (permalink / raw)
  To: grub-devel; +Cc: D.-E. Divernois

Signed-off-by: David-Emmanuel Divernois <d-e.divernois@musiciel.fr>
---
docs/grub.texi | 5 +++-
grub-core/commands/hashsum.c | 46 +++++++++++++++++++++++++++++-------
2 files changed, 41 insertions(+), 10 deletions(-)

diff --git a/docs/grub.texi b/docs/grub.texi
index b81eb1d93..7660ba3f7 100644
--- a/docs/grub.texi
+++ b/docs/grub.texi
@@ -7376,7 +7376,7 @@ Otherwise, the computer is shut down using APM on 
that target.
@node hashsum
@subsection hashsum
-@deffn Command hashsum @option{--hash} hash @option{--keep-going} 
@option{--uncompress} @option{--check} file [@option{--prefix} dir]|file 
@dots{}
+@deffn Command hashsum @option{--hash} hash @option{--keep-going} 
@option{--uncompress} [@option{--set} var] @option{--check} file 
[@option{--prefix} dir]|file @dots{}
Compute or verify file hashes. Hash type is selected with option 
@option{--hash}.
Supported hashes are: @samp{adler32}, @samp{crc64}, @samp{crc32},
@samp{crc32rfc1510}, @samp{crc24rfc2440}, @samp{md4}, @samp{md5},
@@ -7387,6 +7387,9 @@ Option @option{--uncompress} uncompresses files 
before computing hash.
When list of files is given, hash of each file is computed and printed,
followed by file name, each file on a new line.
+When option @option{--set} is given, only one file is allowed and its hash
+is assigned to variable @var{var}.
+
When option @option{--check} is given, it points to a file that contains
list of @var{hash name} pairs in the same format as used by UNIX
@command{md5sum} command. Option @option{--prefix}
diff --git a/grub-core/commands/hashsum.c b/grub-core/commands/hashsum.c
index b6f8e3d1a..fb632e69c 100644
--- a/grub-core/commands/hashsum.c
+++ b/grub-core/commands/hashsum.c
@@ -36,6 +36,8 @@ static const struct grub_arg_option options[] = {
ARG_TYPE_STRING},
{"keep-going", 'k', 0, N_("Don't stop after first error."), 0, 0},
{"uncompress", 'u', 0, N_("Uncompress file before checksumming."), 0, 0},
+ {"set", 's', 0, N_("Store the value in the given variable name."), 
N_("VAR"),
+ ARG_TYPE_STRING},
{0, 0, 0, 0, 0, 0}
};
@@ -210,6 +212,7 @@ grub_cmd_hashsum (struct grub_extcmd_context *ctxt,
struct grub_arg_list *state = ctxt->state;
const char *hashname = NULL;
const char *prefix = NULL;
+ const char *variable = NULL;
const gcry_md_spec_t *hash;
unsigned i;
int keep = state[3].set;
@@ -235,6 +238,13 @@ grub_cmd_hashsum (struct grub_extcmd_context *ctxt,
if (state[2].set)
prefix = state[2].arg;
+ if (state[5].set) {
+ variable = state[5].arg;
+ if (argc != 1)
+ return grub_error (GRUB_ERR_BAD_ARGUMENT,
+ "--set is only usable with a single file");
+ }
+
if (state[1].set)
{
if (argc != 0)
@@ -272,9 +282,27 @@ grub_cmd_hashsum (struct grub_extcmd_context *ctxt,
unread++;
continue;
}
- for (j = 0; j < hash->mdlen; j++)
- grub_printf ("%02x", ((grub_uint8_t *) result)[j]);
- grub_printf (" %s\n", args[i]);
+ if (variable)
+ {
+ char *hex_string = grub_malloc (hash->mdlen * 2 + 1);
+ if (hex_string)
+ {
+ for (j = 0; j < hash->mdlen; j++)
+ {
+ grub_snprintf (hex_string + j * 2, 3, "%02x",
+ ((grub_uint8_t *) result)[j]);
+ }
+ hex_string[hash->mdlen * 2] = '\0';
+ grub_env_set (variable, hex_string);
+ grub_free (hex_string);
+ }
+ }
+ else
+ {
+ for (j = 0; j < hash->mdlen; j++)
+ grub_printf ("%02x", ((grub_uint8_t *) result)[j]);
+ grub_printf (" %s\n", args[i]);
+ }
}
if (unread)
@@ -288,7 +316,7 @@ static grub_extcmd_t cmd, cmd_md5, cmd_sha1, 
cmd_sha256, cmd_sha512, cmd_crc;
GRUB_MOD_INIT(hashsum)
{
cmd = grub_register_extcmd ("hashsum", grub_cmd_hashsum, 0,
- N_("-h HASH [-c FILE [-p PREFIX]] "
+ N_("-h HASH [-c FILE [-p PREFIX]] [-s VAR]"
"[FILE1 [FILE2 ...]]"),
/* TRANSLATORS: "hash checksum" is just to
be a bit more precise, you can treat it as
@@ -296,28 +324,28 @@ GRUB_MOD_INIT(hashsum)
N_("Compute or check hash checksum."),
options);
cmd_md5 = grub_register_extcmd ("md5sum", grub_cmd_hashsum, 0,
- N_("[-c FILE [-p PREFIX]] "
+ N_("[-c FILE [-p PREFIX]] [-s VAR]"
"[FILE1 [FILE2 ...]]"),
N_("Compute or check hash checksum."),
options);
cmd_sha1 = grub_register_extcmd ("sha1sum", grub_cmd_hashsum, 0,
- N_("[-c FILE [-p PREFIX]] "
+ N_("[-c FILE [-p PREFIX]] [-s VAR]"
"[FILE1 [FILE2 ...]]"),
N_("Compute or check hash checksum."),
options);
cmd_sha256 = grub_register_extcmd ("sha256sum", grub_cmd_hashsum, 0,
- N_("[-c FILE [-p PREFIX]] "
+ N_("[-c FILE [-p PREFIX]] [-s VAR]"
"[FILE1 [FILE2 ...]]"),
N_("Compute or check hash checksum."),
options);
cmd_sha512 = grub_register_extcmd ("sha512sum", grub_cmd_hashsum, 0,
- N_("[-c FILE [-p PREFIX]] "
+ N_("[-c FILE [-p PREFIX]] [-s VAR]"
"[FILE1 [FILE2 ...]]"),
N_("Compute or check hash checksum."),
options);
cmd_crc = grub_register_extcmd ("crc", grub_cmd_hashsum, 0,
- N_("[-c FILE [-p PREFIX]] "
+ N_("[-c FILE [-p PREFIX]] [-s VAR]"
"[FILE1 [FILE2 ...]]"),
N_("Compute or check hash checksum."),
options);

-- 
2.51.0


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