write safer, sftp
Project description
sftpovw: safer overwrite file over sftp
protect against corruption:
- old file: data lost if overwrite fails
- new file: partial write may leave corrupt/incomplete file
- readers: processes opening the file may observe unspecified/intermediate data
when PUT localfile to remotefile,
safe level 0
protect nothing
- just put localfile to remotefile
safe level 1
protect readers
- unlink remotefile
- put localfile to remotefile
safe level 2
protect old file and readers
- rename remotefile to tmpfile
- put localfile to remotefile
- unlink tmpfile
safe level 3
protect new file, old file, and readers
- put localfile to tmpfile
- rename tmpfile to remotefile
safe level 4
protect new file, old file, and readers
usually this level is unnecessary. should only be used if your rename is not atomic.
- put localfile to tmpfile1
- rename remotefile to tmpfile2
- rename tmpfile1 to remotefile
- unlink tmpfile2
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