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If a configuration session is exited uncleanly, either as a result of a
network disconnect / timeout or other forced quit from within config
mode, the unionfs mount is left in place. These remain until the
system is rebooted, giving an error when unmounting the config
directory.
This commit checks for old configuartion directories when a user enters
config mode, removing any found that are owned by that user but not
part of any active configuration seesion.
Bug #564 http://bugzilla.vyos.net/show_bug.cgi?id=564
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When changes are made to the system by more than one user, only the
first user after a reboot is able to commit successfully, the others
fail with "Failed to generate committed config". This is caused as
a result of the underlying unionfs-fuse mount used for the system
configuration and the fact that a .unionfs directory if left in the
active configuration with permissions set such that only the original
committing user can change them.
Bug #403 http://bugzilla.vyos.net/show_bug.cgi?id=403
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Use Build-iso to create /etc/fuse.conf file.
Use pipe(),fork(),execl() functions instead of system() function to
call unionfs-fuse.
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Don't fail if lock file already exists
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Bug 8204
Make sure we don't handle unnecessary file descriptors to child
processes. This is done by marking file descriptors as close on
exec, and closing pipe before exec.
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(cherry picked from commit 1b2a0fd1ae1e6dfc18e4f75f73cd7befb47cf538)
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* fix paths issue in edit mode.
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* part of the config backend cleanup/optimization work.
* improves the performance of "load" (w/o commit) by ~55% and "show" by ~15%.
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* this improves backend performance by ~15% in, e.g., "load" (w/o commit) and "show".
* this is only temporary and eventually caching should be done at higher level for better performance, and that will require config path abstraction.
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* for unionfs cstore implementation, enforce file size limit on both read and write and raise limit to 256 KB.
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* don't throw away "unsaved" state when doing "discard".
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* fix ".*" filtering.
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* remove public status modifier as high-level operations no longer need it.
* add more information to clarify changed status handling in library.
* mark changed status at appropriate places in library.
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* need to move changed status handling into the library.
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* original backend implementation uses unionfs-specific "changes only" dir to determine "changed" status. this breaks when it involves deactivated nodes.
* new library design uses explicit per-node "changed" marker. however, since previously "commit" only handles a root "changed" marker, the new library could not implement this scheme and used a workaround instead.
* now add API functions for "commit" to properly clean up "changed" markers.
* modify "commit" to use these API functions and remove the workaround from the new library.
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* would have been a problem if template tree becomes more than 2^32 levels deep or if value strings longer than 2^32 characters are allowed.
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