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create-usb: Always use archive mode

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Change the create-usb command so that it always creates the destination
repository using the "archive" mode, rather than using archive mode when
xattrs aren't supported and bare-user otherwise. This has a few
advantages:

1. The archive mode works with FAT filesystems, which is what most
USB drives are, and which doesn't support xattrs.

2. At least in some quick testing I did, archive mode is about
twice as performant as bare-user mode, in terms of how long it takes for
the create-usb command to complete.

3. This ensures that a tool can safely change the permissions on
".ostree/repo" and subdirectories after create-usb completes, which is
important for Endless since otherwise you can't use `ostree create-usb`
as root and then `flatpak create-usb` as a non-root user on the same USB
drive (or in other words copy OS updates and apps to the same USB).

Closes: #1733
Approved by: cgwalters
This commit is contained in:
Matthew Leeds 2018-09-21 15:35:50 -07:00 committed by Atomic Bot
parent 4aadbe2159
commit fc357adb79
1 changed files with 6 additions and 10 deletions
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16
src/ostree/ot-builtin-create-usb.c
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@ -102,21 +102,17 @@ ostree_builtin_create_usb (int argc,
/* Open the destination repository on the USB stick or create it if it doesn’t exist.
* Check it’s below @mount_root_path, and that it’s not the same as the source
* repository.
*
* If the destination file system supports xattrs (for example, ext4), we use
* a BARE_USER repository; if it doesn’t (for example, FAT), we use ARCHIVE.
* In either case, we want a lossless repository. */
* repository. */
const char *dest_repo_path = (opt_destination_repo != NULL) ? opt_destination_repo : ".ostree/repo";
if (!glnx_shutil_mkdir_p_at (mount_root_dfd, dest_repo_path, 0755, cancellable, error))
return FALSE;
OstreeRepoMode mode = OSTREE_REPO_MODE_BARE_USER;
if (TEMP_FAILURE_RETRY (fgetxattr (mount_root_dfd, "user.test", NULL, 0)) < 0 &&
(errno == ENOTSUP || errno == EOPNOTSUPP))
mode = OSTREE_REPO_MODE_ARCHIVE;
/* Always use the archive repo mode, which works on FAT file systems that
* don't support xattrs, compresses files to save space, doesn't store
* permission info directly in the file attributes, and is at least sometimes
* more performant than bare-user */
OstreeRepoMode mode = OSTREE_REPO_MODE_ARCHIVE;
g_debug ("%s: Creating repository in mode %u", G_STRFUNC, mode);