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bootspec: introduce SYSTEMD_ESP_PATH for overriding where to look for the ESP (#10834)

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This commit is contained in:
Lennart Poettering 2018-11-20 04:37:01 +01:00 committed by Yu Watanabe
parent 53640e6fb9
commit cc7a0bfa15
2 changed files with 19 additions and 0 deletions
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6
docs/ENVIRONMENT.md
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@ -125,6 +125,12 @@ bootctl and other tools that access the EFI System Partition (ESP):
is a FAT file system are turned off, as are checks that the path is located
on a GPT partition with the correct type UUID.
* `$SYSTEMD_ESP_PATH=…` — override the path to the EFI System Partition. This
may be used to override ESP path auto detection, and redirect any accesses to
the ESP to the specified directory. Not that unlike with bootctl's --path=
switch only very superficial validation of the specified path is done when
this environment variable is used.
systemd itself:
* `$SYSTEMD_ACTIVATION_UNIT` — set for all NSS and PAM module invocations that

13
src/shared/bootspec.c
View File

@ -16,6 +16,7 @@
#include "fd-util.h"
#include "fileio.h"
#include "parse-util.h"
#include "path-util.h"
#include "stat-util.h"
#include "string-util.h"
#include "strv.h"
@ -590,6 +591,18 @@ int find_esp_and_warn(
goto found;
}
path = getenv("SYSTEMD_ESP_PATH");
if (path) {
if (!path_is_valid(path) || !path_is_absolute(path)) {
log_error("$SYSTEMD_ESP_PATH does not refer to absolute path, refusing to use it: %s", path);
return -EINVAL;
}
/* Note: when the user explicitly configured things with an env var we won't validate the mount
* point. After all we want this to be useful for testing. */
goto found;
}
FOREACH_STRING(path, "/efi", "/boot", "/boot/efi") {
r = verify_esp(path, true, unprivileged_mode, ret_part, ret_pstart, ret_psize, ret_uuid);