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veritysetup-generator: use generic veritysetup writers at one more place

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Let's use the common generator_write_veritysetup_unit_section(),
ggenerator_write_veritysetup_service_section(), generator_add_symlink()
implementation we already have at one more place.

This mostly generates the same unit, but for the first time hooks up
blockdev@dev-mapper-*.device for the device, which means things like
growfs on usr+root volumes will actually work now. (I mean, growfs
won#t, because verity devices are immutable after all, but things *like*
it that want to run between the device popping up and being mounted.)
This commit is contained in:
Lennart Poettering 2023-06-01 17:20:59 +02:00
parent 6747d9a13f
commit 953006dcb0
1 changed files with 21 additions and 46 deletions
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67
src/veritysetup/veritysetup-generator.c
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@ -50,36 +50,34 @@ STATIC_DESTRUCTOR_REGISTER(arg_usr_options, freep);
static int create_device(
const char *name,
const char *service,
const char *hash,
const char *roothash,
const char *data_what,
const char *hash_what,
const char *options) {
_cleanup_free_ char *u = NULL, *v = NULL, *d = NULL, *e = NULL, *u_escaped = NULL, *v_escaped = NULL,
*hash_escaped = NULL, *options_escaped = NULL;
_cleanup_free_ char *u = NULL, *v = NULL, *d = NULL, *e = NULL;
_cleanup_fclose_ FILE *f = NULL;
const char *to, *from;
int r;
assert(name);
assert(service);
/* If all three pieces of information are missing, then verity is turned off */
if (!hash && !data_what && !hash_what)
if (!roothash && !data_what && !hash_what)
return 0;
/* if one of them is missing however, the data is simply incomplete and this is an error */
if (!hash)
log_error("Verity information for %s incomplete, hash unspecified.", name);
if (!roothash)
log_error("Verity information for %s incomplete, root hash unspecified.", name);
if (!data_what)
log_error("Verity information for %s incomplete, data device unspecified.", name);
if (!hash_what)
log_error("Verity information for %s incomplete, hash device unspecified.", name);
if (!hash || !data_what || !hash_what)
if (!roothash || !data_what || !hash_what)
return -EINVAL;
log_debug("Using %s verity data device %s, hash device %s, options %s, and hash %s.", name, data_what, hash_what, options, hash);
log_debug("Using %s verity data device %s, hash device %s, options %s, and hash %s.", name, data_what, hash_what, options, roothash);
u = fstab_node_to_udev_node(data_what);
if (!u)
@ -88,13 +86,6 @@ static int create_device(
if (!v)
return log_oom();
u_escaped = specifier_escape(u);
if (!u_escaped)
return log_oom();
v_escaped = specifier_escape(v);
if (!v_escaped)
return log_oom();
r = unit_name_from_path(u, ".device", &d);
if (r < 0)
return log_error_errno(r, "Failed to generate unit name: %m");
@ -102,49 +93,33 @@ static int create_device(
if (r < 0)
return log_error_errno(r, "Failed to generate unit name: %m");
options_escaped = specifier_escape(strempty(options));
if (!options_escaped)
return log_oom();
hash_escaped = specifier_escape(hash);
if (!hash_escaped)
return log_oom();
r = generator_open_unit_file(arg_dest, NULL, service, &f);
if (r < 0)
return r;
r = generator_write_veritysetup_unit_section(f, "/proc/cmdline");
if (r < 0)
return r;
fprintf(f,
"[Unit]\n"
"Description=Verity Protection Setup for %%I\n"
"Documentation=man:systemd-veritysetup-generator(8) man:systemd-veritysetup@.service(8)\n"
"SourcePath=/proc/cmdline\n"
"DefaultDependencies=no\n"
"Conflicts=umount.target\n"
"BindsTo=%s %s\n"
"IgnoreOnIsolate=true\n"
"After=veritysetup-pre.target systemd-udevd-kernel.socket %s %s\n"
"Before=veritysetup.target umount.target\n"
"\n[Service]\n"
"Type=oneshot\n"
"RemainAfterExit=yes\n"
"ExecStart=" ROOTLIBEXECDIR "/systemd-veritysetup attach '%s' '%s' '%s' '%s' '%s'\n"
"ExecStop=" ROOTLIBEXECDIR "/systemd-veritysetup detach '%s' \n",
"After=%s %s\n"
"Before=veritysetup.target umount.target\n",
d, e,
d, e,
name, u_escaped, v_escaped, hash_escaped, options_escaped,
name);
d, e);
r = generator_write_veritysetup_service_section(f, name, u, v, roothash, options);
if (r < 0)
return r;
r = fflush_and_check(f);
if (r < 0)
return log_error_errno(r, "Failed to write file unit %s: %m", service);
to = strjoina(arg_dest, "/veritysetup.target.requires/", service);
from = strjoina("../", service);
(void) mkdir_parents(to, 0755);
if (symlink(from, to) < 0)
return log_error_errno(errno, "Failed to create symlink %s: %m", to);
r = generator_add_symlink(arg_dest, "veritysetup.target", "requires", service);
if (r < 0)
return r;
return 0;
}