[pbs-devel] [PATCH v3 proxmox-backup 0/5] fix: #3847 pipe from STDIN to proxmox-backup-client

[Robert Obkircher]

Add support for commands like:
    ssh host cmd | proxmox-backup-client backup data.img:/dev/stdin
    proxmox-backup-client backup a.img:<(mysqldump) b.img:<(pgdump)

Changes since v2:

client: 
- Renamed ChunkSize to IndexType as suggested.

datastore:
- Introduced explicit `index_capacity` field.
    - Previously I (ab)used `index_length` for the capacity and 
      computed the actual index length from `size`.
    - This removes the assert mentioned in the review.
- Renamed INITIAL_CHUNKS_IF_UNKNOWN to INITIAL_CAPACITY and increased 
  it to 128 blocks which is enough for 512 MiB of content.
- Only remap when capacity increases, not every time size increases.
- Increase capacity to next power of 2 instead of by 1.5x.
    - This is less code and file systems probably don't do in place
      updates where 1.5x is theoretically better.
- Ensure that add_digest and close fail after remap errors.
- Keep seek+write_all instead of write_all_at to minimize changes.
- Imroved error messages in clone_data_from.
- Refuse creation of empty files because the original also did that.
- Added tests for FixedIndexWriter:
  - Is it okay to to write to a directory in the cwd?
  - This was inspired by `chunk_store::test_chunk_store1`
- Removed test script.

Changes since v1:
- use mremap+ftruncate instead of write_all_at
- make the size API parameter optional instead of using 0
- use an enum to represent fixed/dynamic chunk size in UploadOptions
- alias "-" to "/dev/stdin"
- split changes into separate commits

Robert Obkircher (5):
  fix #3847: datastore: support writing fidx files of unknown size
  fix #3847: datastore: test FixedIndexWriter
  fix #3847: api: backup: make fixed index file size optional
  fix #3847: client: support fifo pipe inputs for images
  fix #3847: client: treat minus sign as stdin

 pbs-client/src/backup_writer.rs   |  38 ++--
 pbs-datastore/src/datastore.rs    |   2 +-
 pbs-datastore/src/fixed_index.rs  | 304 +++++++++++++++++++++++++++++-
 proxmox-backup-client/src/main.rs |  37 ++--
 src/api2/backup/environment.rs    |   8 +-
 src/api2/backup/mod.rs            |   4 +-
 src/server/push.rs                |  11 +-
 7 files changed, 366 insertions(+), 38 deletions(-)

-- 
2.47.3