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From: Lukas Wagner <l.wagner@proxmox.com>
To: pbs-devel@lists.proxmox.com
Date: Fri, 28 Oct 2022 12:01:42 +0200
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Subject: [pbs-devel] [PATCH v2 proxmox-backup 0/1] fix #3828:
proxmox_backup_debug: Introduce `diff archive` subcommand
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Note: The original patch series included a patch for pxar - since
it has already been merged, it is not included anymore.
This patch series adds the "diff archive" subcommand to proxmox-backup-debug.
It allows to compare pxar archives in two different snapshots, producing
a list of added/modified/deleted directory entries. For example:
$ proxmox-backup-debug diff archive <snapshot-a> <snapshot-b> root.pxar
M d etc
M f etc/hosts
D l etc/localtime
M d tmp
A f tmp/newfile
The first row indicates addded/modified/deleted, the second the type of
directory entry (file, directory, link, FIFO, etc.).
The new command accepts the --ns/--keyfile/--keyfd/--repository options in the
same manner as proxmox-backup-client.
A few words about the new command's performance: For large folder structures
with loads of small files, for example a full container backup, the
tool is pretty slow. This is due to fact that we need to skim through
*a lot* of metadata to distinguish *modified*
files from *potentially modified* files - the latter being files which
happen to be stored in the same chunk as a modified file.
However, in terms of usability it still beats manually restoring two
snapshots and using some directory diff tool on the restored directories.
Changes from v1:
- Removed now unecessary GoodbyeTable match arms since the bug in the pxar
has been fixed.
Lukas Wagner (1):
fix #3828: proxmox_backup_debug: Introduce `diff archive` subcommand.
docs/proxmox-backup-debug/description.rst | 3 +
src/bin/proxmox-backup-debug.rs | 3 +-
src/bin/proxmox_backup_debug/diff.rs | 441 ++++++++++++++++++++++
src/bin/proxmox_backup_debug/mod.rs | 1 +
4 files changed, 447 insertions(+), 1 deletion(-)
create mode 100644 src/bin/proxmox_backup_debug/diff.rs
--
2.30.2