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checkout: Provide useful error with checkout -H and incompat mode

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Previously we'd assert and dump core if one used `checkout -H` without
`-U` on a bare-user repo, because we'd hit the bare-user symlink case.

Rework the code to handle this, and add tests. I hit this when I was going to
suggest to someone to use `-H` to ensure they were getting hardlinks.

Closes: #779
Approved by: jlebon
This commit is contained in:
Colin Walters authored and Atomic Bot committed 2017-04-12 17:06:44 +00:00
1 parent 6a7ee4860f
commit d3385a3014
2 files changed
+76 -16
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src/libostree/ostree-repo-checkout.c
+38 -10
View File
@@ -423,6 +423,7 @@ checkout_one_file_at (OstreeRepo *repo,
gboolean ret = FALSE;
const char *checksum;
gboolean is_symlink;
gboolean is_bare_user_symlink = FALSE;
gboolean can_cache;
gboolean need_copy = TRUE;
char loose_path_buf[_OSTREE_LOOSE_PATH_MAX];
@@ -431,7 +432,6 @@ checkout_one_file_at (OstreeRepo *repo,
gboolean is_whiteout;
is_symlink = g_file_info_get_file_type (source_info) == G_FILE_TYPE_SYMBOLIC_LINK;
checksum = ostree_repo_file_get_checksum ((OstreeRepoFile*)source);
is_whiteout = !is_symlink && options->process_whiteouts &&
@@ -468,20 +468,42 @@ checkout_one_file_at (OstreeRepo *repo,
while (current_repo)
{
gboolean is_bare = ((current_repo->mode == OSTREE_REPO_MODE_BARE
&& options->mode == OSTREE_REPO_CHECKOUT_MODE_NONE) ||
(current_repo->mode == OSTREE_REPO_MODE_BARE_USER
&& options->mode == OSTREE_REPO_CHECKOUT_MODE_USER
/* NOTE: bare-user symlinks are not stored as symlinks */
&& !is_symlink) ||
(current_repo->mode == OSTREE_REPO_MODE_BARE_USER_ONLY
&& options->mode == OSTREE_REPO_CHECKOUT_MODE_USER));
/* TODO - Hoist this up to the toplevel at least for checking out from
* !parent; don't need to compute it for each file.
*/
gboolean repo_is_usermode =
current_repo->mode == OSTREE_REPO_MODE_BARE_USER ||
current_repo->mode == OSTREE_REPO_MODE_BARE_USER_ONLY;
/* We're hardlinkable if the checkout mode matches the repo mode */
gboolean is_hardlinkable =
(current_repo->mode == OSTREE_REPO_MODE_BARE
&& options->mode == OSTREE_REPO_CHECKOUT_MODE_NONE) ||
(repo_is_usermode && options->mode == OSTREE_REPO_CHECKOUT_MODE_USER);
gboolean is_bare = is_hardlinkable && !is_bare_user_symlink;
gboolean current_can_cache = (options->enable_uncompressed_cache
&& current_repo->enable_uncompressed_cache);
gboolean is_archive_z2_with_cache = (current_repo->mode == OSTREE_REPO_MODE_ARCHIVE_Z2
&& options->mode == OSTREE_REPO_CHECKOUT_MODE_USER
&& current_can_cache);
/* NOTE: bare-user symlinks are not stored as symlinks; see
* https://github.com/ostreedev/ostree/commit/47c612e5a0688c3452a125655a245e8f4f01b2b0
* as well as write_object().
*/
is_bare_user_symlink = (repo_is_usermode && is_symlink);
/* Verify if no_copy_fallback is set that we can hardlink, with a
* special exception for bare-user symlinks.
*/
if (options->no_copy_fallback && !is_hardlinkable && !is_bare_user_symlink)
{
glnx_throw (error,
repo_is_usermode ?
"User repository mode requires user checkout mode to hardlink" :
"Bare repository mode cannot hardlink in user checkout mode");
goto out;
}
/* But only under these conditions */
if (is_bare || is_archive_z2_with_cache)
{
@@ -596,7 +618,13 @@ checkout_one_file_at (OstreeRepo *repo,
/* Fall back to copy if we couldn't hardlink */
if (need_copy)
{
g_assert (!options->no_copy_fallback);
/* Bare user mode can't hardlink symlinks, so we need to do a copy for
* those. (Although in the future we could hardlink inside checkouts) This
* assertion is intended to ensure that for regular files at least, we
* succeeded at hardlinking above.
*/
if (options->no_copy_fallback)
g_assert (is_bare_user_symlink);
if (!ostree_repo_load_file (repo, checksum, &input, NULL, &xattrs,
cancellable, error))
goto out;