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Merge pull request #34 from trapexit/updates
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append to db, maxtime limit, interrupted flag
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trapexit authored May 18, 2020
2 parents 1bf4030 + 9e11db3 commit 9dd3846
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156 changes: 87 additions & 69 deletions README.md
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Expand Up @@ -7,64 +7,72 @@ scorch is a tool to catalog files and their hashes to help in discovering file c
```
usage: scorch [<options>] <instruction> [<directory>]
scorch (Silent CORruption CHecker) is a tool to catalog files and hashes
to help in discovering file corruption, missing files, duplicates, etc.
scorch (Silent CORruption CHecker) is a tool to catalog files, hash
digests, and other metadata to help in discovering file corruption,
missing files, duplicates, etc.
positional arguments:
instruction: * add: compute and store hashes for all found files
* append: compute and store for newly found files
* backup: backs up selected database
* restore: restore backed up database
* list-backups: list database backups
* diff-backup: show diff between current & backup DB
* hashes: print available hash functions
* check: check stored hashes against files
* update: update metadata of changed files
* check+update: check and update if new
* cleanup: remove hashes of missing files
* delete: remove hashes for found files
* list-dups: list files w/ dup hashes
* list-missing: list files no longer on filesystem
* list-solo: list files w/ no dup hashes
* list-unhashed: list files not yet hashed
* list: md5sum'ish compatible listing
* in-db: show if hashed files exist in DB
* found-in-db: print files found in DB
* notfound-in-db: print files not found in DB
directory: Directory or file to scan
instruction: * add: compute & store digests for found files
* append: compute & store digests for unhashed files
* backup: backs up selected database
* restore: restore backed up database
* list-backups: list database backups
* diff-backup: show diff between current & backup DB
* hashes: print available hash functions
* check: check stored info against files
* update: update metadata of changed files
* check+update: check and update if new
* cleanup: remove info of missing files
* delete: remove info for found files
* list: md5sum'ish compatible listing
* list-unhashed: list files not yet hashed
* list-missing: list files no longer on filesystem
* list-dups: list files w/ dup digests
* list-solo: list files w/ no dup digests
* list-failed: list files marked failed
* list-changed: list files marked changed
* in-db: show if files exist in DB
* found-in-db: print files found in DB
* notfound-in-db: print files not found in DB
directory: Directory or file to scan.
optional arguments:
-d, --db=: File to store hashes and other metadata in.
(default: /var/tmp/scorch/scorch.db)
-v, --verbose: Make `instruction` more verbose. Actual behavior
depends on the instruction. Can be used multiple
times.
-q, --quote: Shell quote/escape filenames when printed.
-r, --restrict=: * sticky: restrict scan to files with sticky bit
* readonly: restrict scan to readonly files
-f, --fnfilter=: Restrict actions to files which match regex
-F, --negate-fnfilter Negate the fnfilter regex match
-s, --sort=: Sorting routine on input & output (default: natural)
* random: shuffled / random
* natural: human-friendly sort, ascending
* reverse-natural: human-friendly sort, descending
* radix: RADIX sort, ascending
* reverse-radix: RADIX sort, descending
* time: sort by file mtime, ascending
* reverse-time: sort by file mtime, descending
-m, --maxactions=: Max actions to take before exiting (default: maxint)
-M, --maxdata=: Max bytes to process before exiting (default: maxint)
-b, --break-on-error: Any error or hash failure will exit
-D, --diff-fields=: Fields to use to indicate a file has 'changed' and
and should be rehashed. Combine with ','.
(default: size)
* size
* inode
* mtime
* mode
-H, --hash=: Hash algo. Use 'scorch hashes' get available algos.
(default: md5)
-h, --help: Print this message
-d, --db=: File to store digests and other metadata in. See
docs for info. (default: /var/tmp/scorch/scorch.db)
-v, --verbose: Make `instruction` more verbose. Actual behavior
depends on the instruction. Can be used multiple
times.
-q, --quote: Shell quote/escape filenames when printed.
-r, --restrict=: * sticky: restrict scan to files with sticky bit
* readonly: restrict scan to readonly files
-f, --fnfilter=: Restrict actions to files which match regex.
-F, --negate-fnfilter Negate the fnfilter regex match.
-s, --sort=: Sorting routine on input & output. (default: natural)
* random: shuffled / random
* natural: human-friendly sort, ascending
* natural-desc: human-friendly sort, descending
* radix: RADIX sort, ascending
* radix-desc: RADIX sort, descending
* mtime: sort by file mtime, ascending
* mtime-desc: sort by file mtime, descending
* checked: sort by last time checked, ascending
* checked-desc: sort by last time checked, descending
-m, --maxactions=: Max actions before exiting. (default: maxint)
-M, --maxdata=: Max bytes to process before exiting. (default: maxint)
Can use 'K', 'M', 'G', 'T' suffix.
-T, --maxtime=: Max time to process before exiting. (default: maxint)
Can use 's', 'm', 'h', 'd' suffix.
-b, --break-on-error: Any error or digest mismatch will cause an exit.
-D, --diff-fields=: Fields to use to indicate a file has 'changed' (vs.
bitrot / modified) and should be rehashed.
Combine with ','. (default: size)
* size
* inode
* mtime
* mode
-H, --hash=: Hash algo. Use 'scorch hashes' get available algos.
(default: md5)
-h, --help: Print this message.
exit codes:
* 0 : success, behavior executed, something found
Expand All @@ -73,6 +81,7 @@ exit codes:
* 4 : hash mismatch
* 8 : found
* 16 : not found, nothing processed
* 32 : interrupted
```

### Database
Expand All @@ -82,14 +91,19 @@ exit codes:
The file is simply CSV compressed with gzip.

```
$ # file, hash digest, size, mode, mtime, inode
$ # file, hash:digest, size, mode, mtime, inode, state, checked
$ zcat /var/tmp/scorch/scorch.db
/tmp/files/a,md5:d41d8cd98f00b204e9800998ecf8427e,0,33188,1546377833.3844686,123456
/tmp/files/a,md5:d41d8cd98f00b204e9800998ecf8427e,0,33188,1546377833.3844686,123456,0,1588895022.6193066
```

The 'state' value can be 'U' for unknown, 'C' for changed, 'F' for failed, or 'O' for OK.

The 'mtime' and 'checked' values are floating point seconds since epoch.


#### --db argument

The `--db` argument is takes more than a path.
The `--db` argument can take more than a path.

* /tmp/test/myfiles.db : Full path. Used as is.
* /tmp/test : If /tmp/test is a directory -> /tmp/test/scorch.db
Expand All @@ -101,11 +115,6 @@ The `--db` argument is takes more than a path.
If there is no extension then `.db` will be added.


#### Upgrade

If you're using an older version of scorch with the default database in `/var/tmp/scorch.db` just copy/move the file to `/var/tmp/scorch/scorch.db`. The old format was not compressed but scorch will handle reading it uncompressed and compressing it on write.


#### Backup / Restore

To simplify backing up the scorch database there is a backup command. Without a directory defined it will store the database to the same location as the database. If directories are added to the arguments then the database backup will be stored there.
Expand Down Expand Up @@ -149,10 +158,16 @@ $ scorch -v -d /tmp/hash.db list-unhashed /tmp/files
/tmp/files/d
$ scorch -v -d /tmp/hash.db append /tmp/files
1/1 /tmp/files/d: 2b00042f7481c7b056c4b410d28f33cf
1/1 /tmp/files/d: md5:2b00042f7481c7b056c4b410d28f33cf
$ scorch -d /tmp/hash.db list-dups /tmp/files
md5:d41d8cd98f00b204e9800998ecf8427e /tmp/files/a /tmp/files/b /tmp/files/c
$ scorch -v -d /tmp/hash.db list-dups /tmp/files
d41d8cd98f00b204e9800998ecf8427e /tmp/files/a /tmp/files/b /tmp/files/c
md5:d41d8cd98f00b204e9800998ecf8427e
- /tmp/files/a
- /tmp/files/b
- /tmp/files/c
$ echo foo > /tmp/files/a
$ scorch -v -d /tmp/hash.db check+update /tmp/files
Expand All @@ -179,7 +194,7 @@ A typical setup would probably be initialized manually by using **add** or **app
```
#!/bin/sh
scorch check+update /tmp/files
scorch -M 128G -T 2h check+update /tmp/files
scorch append /tmp/files
scorch cleanup /tmp/files
```
Expand All @@ -202,7 +217,10 @@ This software is free to use and released under a very liberal license. That sai

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