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gpt-auto-generator: support LUKS encrypted root partitions

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Previously, we supported GPT auto-discovery for /home and /srv, but not
for the root partition. Add that, too.

Fixes: #859
This commit is contained in:
Lennart Poettering 2016-12-13 18:16:22 +01:00
parent e02c04c045
commit 01af8c019a
3 changed files with 40 additions and 21 deletions
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3
rules/60-persistent-storage.rules
View File

@ -88,7 +88,4 @@ ENV{DEVTYPE}=="partition", ENV{ID_WWN_WITH_EXTENSION}=="?*", SYMLINK+="disk/by-i
ENV{ID_PART_ENTRY_UUID}=="?*", SYMLINK+="disk/by-partuuid/$env{ID_PART_ENTRY_UUID}"
ENV{ID_PART_ENTRY_SCHEME}=="gpt", ENV{ID_PART_ENTRY_NAME}=="?*", SYMLINK+="disk/by-partlabel/$env{ID_PART_ENTRY_NAME}"
# add symlink to GPT root disk
ENV{ID_PART_ENTRY_SCHEME}=="gpt", ENV{ID_PART_GPT_AUTO_ROOT}=="1", SYMLINK+="gpt-auto-root"
LABEL="persistent_storage_end"

5
rules/99-systemd.rules.in
View File

@ -17,6 +17,11 @@ SUBSYSTEM=="block", ACTION=="add", ENV{DM_UDEV_DISABLE_OTHER_RULES_FLAG}=="1", E
# we are probably still calling mke2fs or mkswap on it.
SUBSYSTEM=="block", ENV{DM_UUID}=="CRYPT-*", ENV{ID_PART_TABLE_TYPE}=="", ENV{ID_FS_USAGE}=="", ENV{SYSTEMD_READY}="0"
# add symlink to GPT root disk
SUBSYSTEM=="block", ENV{ID_PART_GPT_AUTO_ROOT}=="1", ENV{ID_FS_TYPE}!="crypto_LUKS", SYMLINK+="gpt-auto-root"
SUBSYSTEM=="block", ENV{ID_PART_GPT_AUTO_ROOT}=="1", ENV{ID_FS_TYPE}=="crypto_LUKS", SYMLINK+="gpt-auto-root-luks"
SUBSYSTEM=="block", ENV{DM_UUID}=="CRYPT-*", ENV{DM_NAME}=="root", SYMLINK+="gpt-auto-root"
# Ignore raid devices that are not yet assembled and started
SUBSYSTEM=="block", ENV{DEVTYPE}=="disk", KERNEL=="md*", TEST!="md/array_state", ENV{SYSTEMD_READY}="0"
SUBSYSTEM=="block", ENV{DEVTYPE}=="disk", KERNEL=="md*", ATTR{md/array_state}=="|clear|inactive", ENV{SYSTEMD_READY}="0"

23
src/gpt-auto-generator/gpt-auto-generator.c
View File

@ -54,7 +54,7 @@ static bool arg_enabled = true;
static bool arg_root_enabled = true;
static bool arg_root_rw = false;
static int add_cryptsetup(const char *id, const char *what, bool rw, char **device) {
static int add_cryptsetup(const char *id, const char *what, bool rw, bool require, char **device) {
_cleanup_free_ char *e = NULL, *n = NULL, *p = NULL, *d = NULL, *to = NULL;
_cleanup_fclose_ FILE *f = NULL;
char *from, *ret;
@ -62,7 +62,6 @@ static int add_cryptsetup(const char *id, const char *what, bool rw, char **devi
assert(id);
assert(what);
assert(device);
r = unit_name_from_path(what, ".device", &d);
if (r < 0)
@ -119,7 +118,9 @@ static int add_cryptsetup(const char *id, const char *what, bool rw, char **devi
if (symlink(from, to) < 0)
return log_error_errno(errno, "Failed to create symlink %s: %m", to);
if (require) {
free(to);
to = strjoin(arg_dest, "/cryptsetup.target.requires/", n);
if (!to)
return log_oom();
@ -136,6 +137,7 @@ static int add_cryptsetup(const char *id, const char *what, bool rw, char **devi
mkdir_parents_label(to, 0755);
if (symlink(from, to) < 0)
return log_error_errno(errno, "Failed to create symlink %s: %m", to);
}
free(p);
p = strjoin(arg_dest, "/dev-mapper-", e, ".device.d/50-job-timeout-sec-0.conf");
@ -155,6 +157,7 @@ static int add_cryptsetup(const char *id, const char *what, bool rw, char **devi
if (!ret)
return log_oom();
if (device)
*device = ret;
return 0;
}
@ -182,7 +185,7 @@ static int add_mount(
if (streq_ptr(fstype, "crypto_LUKS")) {
r = add_cryptsetup(id, what, rw, &crypto_what);
r = add_cryptsetup(id, what, rw, true, &crypto_what);
if (r < 0)
return r;
@ -938,6 +941,16 @@ static int parse_proc_cmdline_item(const char *key, const char *value, void *dat
return 0;
}
#ifdef ENABLE_EFI
static int add_root_cryptsetup(void) {
/* If a device /dev/gpt-auto-root-luks appears, then make it pull in systemd-cryptsetup-root.service, which
* sets it up, and causes /dev/gpt-auto-root to appear which is all we are looking for. */
return add_cryptsetup("root", "/dev/gpt-auto-root-luks", true, false, NULL);
}
#endif
static int add_root_mount(void) {
#ifdef ENABLE_EFI
@ -963,6 +976,10 @@ static int add_root_mount(void) {
r = generator_write_initrd_root_device_deps(arg_dest, "/dev/gpt-auto-root");
if (r < 0)
return 0;
r = add_root_cryptsetup();
if (r < 0)
return r;
}
return add_mount(