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fileio: add new helper write_base64_file_at() which encodes a binary object into base64 and writes it to a file

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This commit is contained in:
Lennart Poettering 2024-06-10 14:50:18 +02:00 committed by Luca Boccassi
parent 73fade298a
commit dc163cd40b
3 changed files with 21 additions and 8 deletions
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16
src/basic/fileio.c
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@ -355,6 +355,22 @@ int write_string_filef(
return write_string_file(fn, p, flags);
}
int write_base64_file_at(
int dir_fd,
const char *fn,
const struct iovec *data,
WriteStringFileFlags flags) {
_cleanup_free_ char *encoded = NULL;
ssize_t n;
n = base64mem_full(data ? data->iov_base : NULL, data ? data->iov_len : 0, 79, &encoded);
if (n < 0)
return n;
return write_string_file_at(dir_fd, fn, encoded, flags);
}
int read_one_line_file_at(int dir_fd, const char *filename, char **ret) {
_cleanup_fclose_ FILE *f = NULL;
int r;

2
src/basic/fileio.h
View file

@ -66,6 +66,8 @@ static inline int write_string_file(const char *fn, const char *line, WriteStrin
return write_string_file_ts(fn, line, flags, NULL);
}
int write_base64_file_at(int dir_fd, const char *fn, const struct iovec *data, WriteStringFileFlags flags);
int write_string_filef(const char *fn, WriteStringFileFlags flags, const char *format, ...) _printf_(3, 4);
int read_one_line_file_at(int dir_fd, const char *filename, char **ret);

11
src/pcrlock/pcrlock.c
View file

@ -4391,15 +4391,10 @@ static int write_boot_policy_file(const char *json_text) {
if (r < 0)
return log_error_errno(r, "Failed to encode policy as credential: %m");
_cleanup_free_ char *base64_buf = NULL;
ssize_t base64_size;
base64_size = base64mem_full(encoded.iov_base, encoded.iov_len, 79, &base64_buf);
if (base64_size < 0)
return base64_size;
r = write_string_file(
r = write_base64_file_at(
AT_FDCWD,
boot_policy_file,
base64_buf,
&encoded,
WRITE_STRING_FILE_ATOMIC|WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_SYNC|WRITE_STRING_FILE_MKDIR_0755);
if (r < 0)
return log_error_errno(r, "Failed to write boot policy file to '%s': %m", boot_policy_file);