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/** |
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* This file is part of the CernVM File System. |
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*/ |
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#include <string> |
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#include "backoff.h" |
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#include "catalog_mgr_ro.h" |
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#include "catalog_mgr_rw.h" |
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#include "directory_entry.h" |
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#include "manifest.h" |
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#include "publish/except.h" |
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#include "publish/repository.h" |
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#include "publish/repository_util.h" |
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#include "publish/settings.h" |
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#include "util/exception.h" |
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#include "util/logging.h" |
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#include "util/pointer.h" |
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#include "util/posix.h" |
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namespace publish { |
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void Publisher::TransactionRetry() { |
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if (managed_node_.IsValid()) { |
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const int rvi = managed_node_->Check(false /* is_quiet */); |
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if (rvi != 0) |
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throw EPublish("cannot establish writable mountpoint"); |
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} |
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BackoffThrottle throttle(500, 5000, 10000); |
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// Negative timeouts (i.e.: no retry) will result in a deadline that has |
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// already passed and thus has the correct effect |
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uint64_t deadline = platform_monotonic_time() |
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+ settings_.transaction().GetTimeoutS(); |
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if (settings_.transaction().GetTimeoutS() == 0) |
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deadline = uint64_t(-1); |
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while (true) { |
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try { |
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TransactionImpl(); |
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break; |
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} catch (const publish::EPublish &e) { |
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if (e.failure() != EPublish::kFailTransactionState) { |
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session_->Drop(); |
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in_transaction_.Clear(); |
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} |
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if ((e.failure() == EPublish::kFailTransactionState) |
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|| (e.failure() == EPublish::kFailLeaseBusy)) { |
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if (platform_monotonic_time() > deadline) |
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throw; |
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LogCvmfs(kLogCvmfs, kLogStdout, "repository busy, retrying"); |
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throttle.Throttle(); |
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continue; |
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} |
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throw; |
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} // try-catch |
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} // while (true) |
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if (managed_node_.IsValid()) |
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managed_node_->Open(); |
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} |
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void Publisher::TransactionImpl() { |
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if (in_transaction_.IsSet()) { |
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throw EPublish("another transaction is already open", |
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EPublish::kFailTransactionState); |
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} |
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InitSpoolArea(); |
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// On error, Transaction() will release the transaction lock and drop |
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// the session |
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session_->Acquire(); |
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// Now that the lease is held (the lease subtree is frozen) refresh to the |
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// current HEAD before any HEAD-dependent step. The manifest fetched when this |
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// process started can be stale: another release manager may have advanced HEAD |
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// in the meantime. Refreshing here makes both the lease-path validation below |
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// and the catalog diff at publish time see post-lease HEAD. Without it, a |
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// parent path another publisher just created looks absent (spurious |
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// kFailLeaseNoEntry), and concurrently-added content looks deleted and gets |
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// dropped (#3867). Done on every gateway transaction, not only when waiting on |
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// a busy lease -- staleness is independent of contention. DownloadRootObjects |
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// also invalidates the cached read-only catalog manager; Check() remounts the |
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// read-only layer only if outdated; managed_node_ is absent for mount-less |
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// publishing. |
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if (settings_.storage().type() == upload::SpoolerDefinition::Gateway) { |
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DownloadRootObjects(settings_.url(), settings_.fqrn(), |
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settings_.transaction().spool_area().tmp_dir()); |
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if (managed_node_.IsValid()) { |
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const int rvi = managed_node_->Check(true /* is_quiet */); |
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if (rvi != 0) |
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throw EPublish("cannot establish writable mountpoint"); |
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} |
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} |
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// We might have a valid lease for a non-existing path. Nevertheless, we run |
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// run into problems when merging catalogs later, so for the time being we |
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// disallow transactions on non-existing paths. |
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if (!settings_.transaction().lease_path().empty()) { |
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const std::string path = GetParentPath( |
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"/" + settings_.transaction().lease_path()); |
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catalog::SimpleCatalogManager *catalog_mgr = GetSimpleCatalogManager(); |
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catalog::DirectoryEntry dirent; |
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const bool retval = catalog_mgr->LookupPath(path, catalog::kLookupDefault, |
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&dirent); |
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if (!retval) { |
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throw EPublish("cannot open transaction on non-existing path " + path, |
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EPublish::kFailLeaseNoEntry); |
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} |
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if (!dirent.IsDirectory()) { |
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throw EPublish( |
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"cannot open transaction on " + path + ", which is not a directory", |
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EPublish::kFailLeaseNoDir); |
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} |
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} |
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const UniquePtr<CheckoutMarker> marker(CheckoutMarker::CreateFrom( |
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settings_.transaction().spool_area().checkout_marker())); |
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in_transaction_.Set(); |
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// Pre-create the publishing lock file so that Abort() can acquire it even |
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// if the disk fills up before abort is called. |
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is_publishing_.Touch(); |
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ConstructSpoolers(); |
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if (marker.IsValid()) |
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settings_.GetTransaction()->SetBaseHash(marker->hash()); |
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else |
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settings_.GetTransaction()->SetBaseHash(manifest_->catalog_hash()); |
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if (settings_.transaction().HasTemplate()) { |
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LogCvmfs(kLogCvmfs, llvl_ | kLogStdout | kLogNoLinebreak, |
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"CernVM-FS: cloning template %s --> %s ... ", |
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settings_.transaction().template_from().c_str(), |
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settings_.transaction().template_to().c_str()); |
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ConstructSyncManagers(); |
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try { |
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catalog_mgr_->CloneTree(settings_.transaction().template_from(), |
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settings_.transaction().template_to()); |
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} catch (const ECvmfsException &e) { |
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const std::string panic_msg = e.what(); |
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in_transaction_.Clear(); |
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// TODO(aandvalenzuela): release session token (gateway publishing) |
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throw publish::EPublish("cannot clone directory tree. " + panic_msg, |
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publish::EPublish::kFailInput); |
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} |
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Sync(); |
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SendTalkCommand( |
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settings_.transaction().spool_area().readonly_talk_socket(), |
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"chroot " + settings_.transaction().base_hash().ToString() + "\n"); |
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LogCvmfs(kLogCvmfs, llvl_ | kLogStdout, "[done]"); |
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// TODO(jblomer): fix-me |
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// PushReflog(); |
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} |
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LogCvmfs(kLogCvmfs, llvl_ | kLogDebug | kLogSyslog, "(%s) opened transaction", |
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settings_.fqrn().c_str()); |
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} |
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} // namespace publish |
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