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prepare-root: bind mount var under deployment for compatibility

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This commit is contained in:
Misaki Kasumi 2025-01-03 05:44:41 +08:00
parent d472e60e03
commit 71f9146a34
1 changed files with 16 additions and 6 deletions
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22
src/switchroot/ostree-prepare-root.c
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@ -610,13 +610,23 @@ main (int argc, char *argv[])
const char *var_dir = OTCORE_RUN_OSTREE_PRIVATE "/var";
/* Bind-mount /var, and remount as writable. */
if (mkdirat (AT_FDCWD, var_dir, 0) < 0)
err (EXIT_FAILURE, "failed to mkdir %s", var_dir);
/* Prepare /var.
* When a read-only sysroot is configured, this adds a dedicated bind-mount (to itself)
* so that the stateroot location stays writable. */
if (sysroot_readonly)
{
/* Bind-mount /var (at stateroot path), and remount as writable. */
if (mount ("../../var", "../../var", NULL, MS_BIND | MS_SILENT, NULL) < 0)
err (EXIT_FAILURE, "failed to prepare /var bind-mount at %s", srcpath);
if (mount ("../../var", "../../var", NULL, MS_BIND | MS_REMOUNT | MS_SILENT, NULL) < 0)
err (EXIT_FAILURE, "failed to make writable /var bind-mount at %s", srcpath);
}
/* Bind-mount var to var_dir */
if (mount ("../../var", var_dir, NULL, MS_BIND | MS_SILENT, NULL) < 0)
err (EXIT_FAILURE, "failed to prepare /var bind-mount at %s", var_dir);
if (mount (var_dir, var_dir, NULL, MS_BIND | MS_REMOUNT | MS_SILENT, NULL) < 0)
err (EXIT_FAILURE, "failed to make writable /var bind-mount at %s", var_dir);
err (EXIT_FAILURE, "failed to bind mount %s", var_dir);
if (mount (NULL, var_dir, NULL, MS_SLAVE | MS_SILENT, NULL) < 0)
err (EXIT_FAILURE, "failed to change %s to slave mount", var_dir);
/* When running under systemd, /var will be handled by a 'var.mount' unit outside
* of initramfs.