diff options
Diffstat (limited to 'libbuild2/depdb.hxx')
| -rw-r--r-- | libbuild2/depdb.hxx | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/libbuild2/depdb.hxx b/libbuild2/depdb.hxx index 55413bf..5855c3f 100644 --- a/libbuild2/depdb.hxx +++ b/libbuild2/depdb.hxx @@ -66,14 +66,15 @@ namespace build2 // enum class state {read, read_eof, write}; - depdb_base (const path&, state, optional<uint64_t> pos = nullopt); + depdb_base (const path&, bool ro, state, optional<uint64_t> pos = nullopt); ~depdb_base (); state state_; + bool ro_; union { - ifdstream is_; // read, read_eof + ifdstream is_; // read, read_eof, (ro && write) ofdstream os_; // write }; @@ -107,13 +108,19 @@ namespace build2 // has wrong format version, or is corrupt, then the database will be // immediately switched to writing. // + // If read_only is true, then don't actually make any modifications to the + // database file. In other words, the database is still nominally switched + // to writing but without any filesystem changes. Note that calling any + // write-only functions (write(), touch, etc) on such a database is + // illegal. + // // The failure commonly happens when the user tries to stash the target in // a non-existent subdirectory but forgets to add the corresponding fsdir{} // prerequisite. That's why the issued diagnostics may provide the // corresponding hint. // explicit - depdb (path_type); + depdb (path_type, bool read_only = false); struct reopen_state { @@ -304,7 +311,7 @@ namespace build2 depdb& operator= (const depdb&) = delete; private: - depdb (path_type&&, timestamp); + depdb (path_type&&, bool, timestamp); void change (bool truncate = true); |