fs-util: add helper path_is_encrypted() that checks if a file system is encrypted
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@ -8,8 +8,10 @@
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#include <unistd.h>
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#include "alloc-util.h"
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#include "blockdev-util.h"
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#include "dirent-util.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "fs-util.h"
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#include "locale-util.h"
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#include "log.h"
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@ -1488,3 +1490,26 @@ int open_parent(const char *path, int flags, mode_t mode) {
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return fd;
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}
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int path_is_encrypted(const char *path) {
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_cleanup_free_ char *uuids = NULL;
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char p[SYS_BLOCK_PATH_MAX("/dm/uuid")];
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dev_t devt;
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int r;
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r = get_block_device(path, &devt);
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if (r < 0)
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return r;
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if (r == 0) /* doesn't have a block device */
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return false;
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xsprintf_sys_block_path(p, "/dm/uuid", devt);
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r = read_one_line_file(p, &uuids);
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if (r == -ENOENT)
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return false;
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if (r < 0)
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return r;
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/* The DM device's uuid attribute is prefixed with "CRYPT-" if this is a dm-crypt device. */
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return !!startswith(uuids, "CRYPT-");
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}
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@ -122,3 +122,5 @@ int fsync_path_at(int at_fd, const char *path);
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int syncfs_path(int atfd, const char *path);
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int open_parent(const char *path, int flags, mode_t mode);
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int path_is_encrypted(const char *path);
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@ -846,6 +846,28 @@ static void test_chmod_and_chown_unsafe(void) {
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assert_se(S_ISLNK(st.st_mode));
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}
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static void test_path_is_encrypted_one(const char *p, int expect) {
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int r;
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r = path_is_encrypted(p);
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assert_se(r >= 0);
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printf("%s encrypted: %s\n", p, yes_no(r));
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assert_se(expect < 0 || ((r > 0) == (expect > 0)));
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}
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static void test_path_is_encrypted(void) {
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log_info("/* %s */", __func__);
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test_path_is_encrypted_one("/home", -1);
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test_path_is_encrypted_one("/var", -1);
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test_path_is_encrypted_one("/", -1);
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test_path_is_encrypted_one("/proc", false);
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test_path_is_encrypted_one("/sys", false);
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test_path_is_encrypted_one("/dev", false);
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}
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int main(int argc, char *argv[]) {
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test_setup_logging(LOG_INFO);
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@ -864,6 +886,7 @@ int main(int argc, char *argv[]) {
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test_rename_noreplace();
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test_chmod_and_chown();
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test_chmod_and_chown_unsafe();
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test_path_is_encrypted();
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return 0;
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}
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