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Added the ability to format a filesystem with encryption, using a passphrase key located within a file

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prey169 2025-07-03 23:54:12 -04:00
parent 7d69a303d1
commit 7362ed1223
2 changed files with 19 additions and 1 deletions
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19
c_src/cmd_format.c
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@ -21,6 +21,7 @@
#include <uuid/uuid.h>
#include "cmds.h"
#include "tools-util.h"
#include "posix_to_bcachefs.h"
#include "libbcachefs.h"
#include "crypto.h"
@ -34,6 +35,7 @@
#define OPTS \
x(0, replicas, required_argument) \
x(0, encrypted, no_argument) \
x(0, passphrase_file, required_argument) \
x(0, no_passphrase, no_argument) \
x('L', fs_label, required_argument) \
x('U', uuid, required_argument) \
@ -59,6 +61,7 @@ static void format_usage(void)
puts(" --replicas=# Sets both data and metadata replicas\n"
" --encrypted Enable whole filesystem encryption (chacha20/poly1305)\n"
" --passphrase_file=file File containing passphrase used for encryption/decryption\n"
" --no_passphrase Don't encrypt master encryption key\n"
" -L, --fs_label=label\n"
" -U, --uuid=uuid\n"
@ -173,6 +176,9 @@ int cmd_format(int argc, char *argv[])
case O_encrypted:
opts.encrypted = true;
break;
case O_passphrase_file:
opts.passphrase_file = optarg;
break;
case O_no_passphrase:
no_passphrase = true;
break;
@ -247,8 +253,19 @@ int cmd_format(int argc, char *argv[])
if (opts.source && !initialize)
die("--source, --no_initialize are incompatible");
if (opts.passphrase_file && !opts.encrypted)
die("--passphrase_file, requires --encrypted set");
if (opts.passphrase_file && no_passphrase) {
die("--passphrase_file, --no_passphrase are incompatible");
}
if (opts.encrypted && !no_passphrase) {
opts.passphrase = read_passphrase_twice("Enter passphrase: ");
if (opts.passphrase_file) {
opts.passphrase = read_file_str(AT_FDCWD, opts.passphrase_file);
} else {
opts.passphrase = read_passphrase_twice("Enter passphrase: ");
}
initialize = false;
}

1
c_src/libbcachefs.h
View File

@ -41,6 +41,7 @@ struct format_opts {
unsigned version;
unsigned superblock_size;
bool encrypted;
char *passphrase_file;
char *passphrase;
char *source;
bool no_sb_at_end;