mirror of
https://github.com/mgree/ffs.git
synced 2024-08-17 07:10:35 +03:00
--new
flag for creating files from empty (#38)
Running `--new FILE.EXT` will:
- infer the output format form `EXT`
- use `FILE.EXT` as the output
- start with a single, empty, named directory (but allocate a bit more space)
In implementing this, I realized that introducing metadata (fad45bed4b
) meant we no longer inferred types automatically. I added a type `Typ::Auto` and some inference code.
This commit is contained in:
parent
7249ae95df
commit
a1d5718ac9
@ -8,6 +8,7 @@
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* `--pretty` flag for JSON and TOML.
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* Wrote INSTALL.md.
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* Improved manpage.
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* `--new` flag for starting from an empty filesystem.
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## 0.1.0 - 2021-06-26
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@ -8,6 +8,7 @@ ffs - the file filesystem
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# SYNOPSIS
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| ffs \[*FLAGS*\] \[*OPTIONS*\] \[*INPUT*\]
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| ffs \[*FLAGS*\] \[*OPTIONS*\] --new \[*OUTPUT*\]
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| ffs *--completions* *SHELL*
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| ffs \[*-h*\|*--help*\]
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| ffs \[*-V*\|*--version*\]
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@ -103,6 +104,14 @@ installed on your system to use *ffs*.
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: Sets the output file for saving changes (defaults to stdout)
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--new *NEW*
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: Mounts an empty filesystem, inferring a mountpoint and output format. Running --new *FILE*.*EXT* is morally equivalent to running:
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```
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echo '{}' | ffs --source json -o *FILE*.*EXT* --target *EXT* -m *FILE*
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```
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where the mountpoint *FILE* will be created (and removed) by ffs.
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--completions *SHELL*
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: Generate shell completions (and exits) [possible values: bash, fish,
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@ -138,13 +147,20 @@ formats (currently, JSON, TOML, and YAML); *ffs* maps values in these
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formats to filesystems. Here are the different types and how they're
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mapped to a filesystem:
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auto
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: Automatically detected. The following order is used for UTF-8
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encodable data: null, boolean, integer, float, datetime, string. If
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data can't be encoded in UTF-8, it will always be bytes.
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boolean
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: Mapped to a **file**. Either *true* or *false*.
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bytes
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: Mapped to a **file**. When serializing back to format, it will be encoded in base64.
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: Mapped to a **file**. When saving, bytes are typically encoded in
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base64.
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datetime
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@ -165,9 +181,9 @@ list
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named elements, starting from 0. Filenames will be padded with zeros
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to ensure proper sorting; use *--unpadded* to disable padding. While
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mounted, you are free to use whatever filenames you like in a list
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directory. When list directories are serialized back to a format,
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filenames are ignored and the sorted order of the files (in the
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current locale) will be used to determine the list order.
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directory. When list directories are saved, filenames are ignored
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and the sorted order of the files (in the current locale) will be
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used to determine the list order.
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named
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@ -229,6 +245,15 @@ umount commits
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# changes are written back to commits.json (-i is in-place mode)
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```
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If you want to create a new file wholesale, the --new flag is helpful.
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```shell
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ffs --new file.json
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# do edits in file directory
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umount file
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# corresponding json is in file.json
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```
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To mount a JSON file and write back out a YAML file, you could run:
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```shell
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48
man/ffs.1
48
man/ffs.1
@ -11,6 +11,10 @@ ffs [\f[I]FLAGS\f[R]] [\f[I]OPTIONS\f[R]] [\f[I]INPUT\f[R]]
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.PD 0
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.P
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.PD
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ffs [\f[I]FLAGS\f[R]] [\f[I]OPTIONS\f[R]] --new [\f[I]OUTPUT\f[R]]
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.PD 0
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.P
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.PD
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ffs \f[I]--completions\f[R] \f[I]SHELL\f[R]
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.PD 0
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.P
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@ -92,8 +96,25 @@ specified when running on stdin
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-o, --output \f[I]OUTPUT\f[R]
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Sets the output file for saving changes (defaults to stdout)
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.TP
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--new \f[I]NEW\f[R]
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Mounts an empty filesystem, inferring a mountpoint and output format.
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Running --new \f[I]FILE\f[R].\f[I]EXT\f[R] is morally equivalent to
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running:
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.RS
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.IP
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.nf
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\f[C]
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echo \[aq]{}\[aq] | ffs --source json -o *FILE*.*EXT* --target *EXT* -m *FILE*
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\f[R]
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.fi
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.PP
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where the mountpoint \f[I]FILE\f[R] will be created (and removed) by
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ffs.
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.RE
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.TP
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--completions \f[I]SHELL\f[R]
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Generate shell completions and exit [possible values: bash, fish, zsh]
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Generate shell completions (and exits) [possible values: bash, fish,
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zsh]
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.TP
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-s, --source \f[I]SOURCE_FORMAT\f[R]
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Specify the source format explicitly (by default, automatically inferred
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@ -117,13 +138,19 @@ formats (currently, JSON, TOML, and YAML); \f[I]ffs\f[R] maps values in
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these formats to filesystems.
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Here are the different types and how they\[aq]re mapped to a filesystem:
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.TP
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auto
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Automatically detected.
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The following order is used for UTF-8 encodable data: null, boolean,
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integer, float, datetime, string.
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If data can\[aq]t be encoded in UTF-8, it will always be bytes.
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.TP
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boolean
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Mapped to a \f[B]file\f[R].
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Either \f[I]true\f[R] or \f[I]false\f[R].
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.TP
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bytes
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Mapped to a \f[B]file\f[R].
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When serializing back to format, it will be encoded in base64.
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When saving, bytes are typically encoded in base64.
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.TP
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datetime
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Mapped to a \f[B]file\f[R].
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@ -145,9 +172,9 @@ Filenames will be padded with zeros to ensure proper sorting; use
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\f[I]--unpadded\f[R] to disable padding.
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While mounted, you are free to use whatever filenames you like in a list
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directory.
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When list directories are serialized back to a format, filenames are
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ignored and the sorted order of the files (in the current locale) will
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be used to determine the list order.
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When list directories are saved, filenames are ignored and the sorted
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order of the files (in the current locale) will be used to determine the
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list order.
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.TP
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named
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Mapped to a \f[B]directory\f[R].
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@ -214,6 +241,17 @@ umount commits
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\f[R]
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.fi
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.PP
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If you want to create a new file wholesale, the --new flag is helpful.
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.IP
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.nf
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\f[C]
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ffs --new file.json
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# do edits in file directory
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umount file
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# corresponding json is in file.json
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\f[R]
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.fi
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.PP
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To mount a JSON file and write back out a YAML file, you could run:
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.IP
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.nf
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@ -134,6 +134,15 @@ pub fn app() -> App<'static, 'static> {
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.short("m")
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.takes_value(true)
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)
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.arg(
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Arg::with_name("NEW")
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.help("Mounts an empty filesystem, inferring a mountpoint and output format")
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.long("new")
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.takes_value(true)
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.conflicts_with("INPLACE")
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.conflicts_with("SOURCE_FORMAT")
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.conflicts_with("OUTPUT")
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)
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.arg(
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Arg::with_name("INPUT")
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.help("Sets the input file ('-' means STDIN)")
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@ -36,11 +36,13 @@ pub struct Config {
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pub enum Input {
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Stdin,
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File(PathBuf),
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Empty,
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}
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impl std::fmt::Display for Input {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> Result<(), std::fmt::Error> {
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match self {
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Input::Empty => write!(f, "<empty>"),
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Input::Stdin => write!(f, "<stdin>"),
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Input::File(file) => write!(f, "{}", file.display()),
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}
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@ -6,7 +6,7 @@ use tracing::{debug, error, info, instrument, warn};
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use fuser::FileType;
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use super::config::{Config, Output};
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use super::config::{Config, Input, Output};
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use super::fs::{DirEntry, DirType, Entry, Inode, FS};
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use ::toml as serde_toml;
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@ -24,6 +24,7 @@ pub enum Format {
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/// Types classifying string data.
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#[derive(Copy, Clone, Debug, PartialEq, Eq)]
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pub enum Typ {
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Auto,
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Null,
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Boolean,
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Integer,
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@ -53,6 +54,7 @@ impl std::fmt::Display for Typ {
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f,
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"{}",
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match self {
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Typ::Auto => "auto",
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Typ::Null => "null",
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Typ::Boolean => "boolean",
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Typ::Bytes => "bytes",
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@ -95,7 +97,9 @@ impl FromStr for Typ {
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fn from_str(s: &str) -> Result<Self, ()> {
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let s = s.trim().to_lowercase();
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if s == "null" {
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if s == "auto" {
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Ok(Typ::Auto)
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} else if s == "null" {
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Ok(Typ::Null)
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} else if s == "boolean" || s == "bool" {
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Ok(Typ::Boolean)
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@ -127,10 +131,37 @@ impl Format {
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/// particular `Config`.
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///
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/// NB there is no check that `self == fs.config.input_format`!
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#[instrument(level = "info", skip(reader, config))]
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pub fn load(&self, reader: Box<dyn std::io::Read>, config: Config) -> FS {
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#[instrument(level = "info", skip(config))]
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pub fn load(&self, config: Config) -> FS {
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let mut inodes: Vec<Option<Inode>> = Vec::new();
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let reader: Box<dyn std::io::Read> = match &config.input {
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Input::Stdin => Box::new(std::io::stdin()),
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Input::File(file) => {
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let fmt = config.input_format;
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let file = std::fs::File::open(&file).unwrap_or_else(|e| {
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error!("Unable to open {} for {} input: {}", file.display(), fmt, e);
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std::process::exit(1);
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});
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Box::new(file)
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}
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Input::Empty => {
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// let's just reserve some space for later and get cracking
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info!("reserving space in empty filesystem");
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inodes.resize_with(1024, || None);
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// create an empty directory
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let contents = HashMap::with_capacity(16);
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inodes[1] = Some(Inode::new(
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fuser::FUSE_ROOT_ID,
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fuser::FUSE_ROOT_ID,
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Entry::Directory(DirType::Named, contents),
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&config,
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));
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return FS::new(inodes, config);
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}
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};
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match self {
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Format::Json => {
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info!("reading json value");
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@ -478,6 +509,19 @@ mod json {
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fn from_string(typ: Typ, contents: String, _config: &Config) -> Self {
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match typ {
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Typ::Auto => {
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if contents.is_empty() {
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Value::Null
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} else if contents == "true" {
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Value::Bool(true)
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} else if contents == "false" {
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Value::Bool(false)
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} else if let Ok(n) = serde_json::Number::from_str(&contents) {
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Value::Number(n)
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} else {
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Value::String(contents)
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}
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}
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Typ::Boolean => {
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if contents == "true" {
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Value::Bool(true)
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@ -613,6 +657,21 @@ mod toml {
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fn from_string(typ: Typ, contents: String, _config: &Config) -> Self {
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match typ {
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Typ::Auto => {
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if contents == "true" {
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Value::Boolean(true)
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} else if contents == "false" {
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Value::Boolean(false)
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} else if let Ok(n) = i64::from_str(&contents) {
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Value::Integer(n)
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} else if let Ok(n) = f64::from_str(&contents) {
|
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Value::Float(n)
|
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} else if let Ok(datetime) = str::parse(&contents) {
|
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Value::Datetime(datetime)
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} else {
|
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Value::String(contents)
|
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}
|
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}
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Typ::Boolean => {
|
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if contents == "true" {
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Value::Boolean(true)
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@ -808,6 +867,21 @@ mod yaml {
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fn from_string(typ: Typ, contents: String, _config: &Config) -> Self {
|
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match typ {
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Typ::Auto => {
|
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if contents.is_empty() {
|
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Value(Yaml::Null)
|
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} else if contents == "true" {
|
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Value(Yaml::Boolean(true))
|
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} else if contents == "false" {
|
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Value(Yaml::Boolean(false))
|
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} else if let Ok(n) = i64::from_str(&contents) {
|
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Value(Yaml::Integer(n))
|
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} else if let Ok(_n) = f64::from_str(&contents) {
|
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Value(Yaml::Real(contents))
|
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} else {
|
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Value(Yaml::String(contents))
|
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}
|
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}
|
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Typ::Boolean => {
|
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if contents == "true" {
|
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Value(Yaml::Boolean(true))
|
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|
@ -950,7 +950,7 @@ impl Filesystem for FS {
|
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|
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// create the inode entry
|
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let (entry, kind) = if file_type == libc::S_IFREG as u32 {
|
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(Entry::File(Typ::String, Vec::new()), FileType::RegularFile)
|
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(Entry::File(Typ::Auto, Vec::new()), FileType::RegularFile)
|
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} else {
|
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assert_eq!(file_type, libc::S_IFDIR as u32);
|
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(
|
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|
131
src/main.rs
131
src/main.rs
@ -129,6 +129,102 @@ fn main() {
|
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None => config.gid = unsafe { libc::getegid() },
|
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}
|
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|
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match args.value_of("NEW") {
|
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Some(target_file) => {
|
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if args.occurrences_of("INPUT") != 0 {
|
||||
error!("It doesn't make sense to set `--new` with a specified input file.");
|
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std::process::exit(1);
|
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}
|
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|
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let output = PathBuf::from(target_file);
|
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|
||||
if output.exists() {
|
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error!("Output file {} already exists.", output.display());
|
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std::process::exit(1);
|
||||
}
|
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|
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let format = match args
|
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.value_of("TARGET_FORMAT")
|
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.ok_or(format::ParseFormatError::NoFormatProvided)
|
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.and_then(|s| s.parse::<Format>())
|
||||
{
|
||||
Ok(target_format) => target_format,
|
||||
Err(e) => {
|
||||
match e {
|
||||
format::ParseFormatError::NoSuchFormat(s) => {
|
||||
warn!(
|
||||
"Unrecognized format '{}', inferring from {}.",
|
||||
s,
|
||||
output.display(),
|
||||
)
|
||||
}
|
||||
format::ParseFormatError::NoFormatProvided => {
|
||||
debug!("Inferring output format from input.")
|
||||
}
|
||||
};
|
||||
|
||||
match output
|
||||
.extension()
|
||||
.and_then(|s| s.to_str())
|
||||
.ok_or(format::ParseFormatError::NoFormatProvided)
|
||||
.and_then(|s| s.parse::<Format>())
|
||||
{
|
||||
Ok(format) => format,
|
||||
Err(_) => {
|
||||
error!(
|
||||
"Unrecognized format '{}'; use --target or a known extension to specify a format.",
|
||||
output.display()
|
||||
);
|
||||
std::process::exit(1);
|
||||
}
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
let mount = match args.value_of("MOUNT") {
|
||||
Some(mount_point) => {
|
||||
let mount_point = PathBuf::from(mount_point);
|
||||
if !mount_point.exists() {
|
||||
error!("Mount point {} does not exist.", mount_point.display());
|
||||
std::process::exit(1);
|
||||
}
|
||||
config.cleanup_mount = false;
|
||||
Some(mount_point)
|
||||
}
|
||||
None => {
|
||||
// If the output is to a file foo.EXT, then try to make a directory foo.
|
||||
let mount_dir = output.with_extension("");
|
||||
|
||||
// If that file already exists, give up and tell the user about --mount.
|
||||
if mount_dir.exists() {
|
||||
error!("Inferred mountpoint '{mount}' for output file '{file}', but '{mount}' already exists. Use `--mount MOUNT` to specify a mountpoint.",
|
||||
mount = mount_dir.display(), file = output.display());
|
||||
std::process::exit(1);
|
||||
}
|
||||
|
||||
// If the mountpoint can't be created, give up and tell the user about --mount.
|
||||
if let Err(e) = std::fs::create_dir(&mount_dir) {
|
||||
error!("Couldn't create mountpoint '{}': {}. Use `--mount MOUNT` to specify a mountpoint.",
|
||||
mount_dir.display(),
|
||||
e
|
||||
);
|
||||
std::process::exit(1);
|
||||
}
|
||||
|
||||
// We did it!
|
||||
config.cleanup_mount = true;
|
||||
Some(mount_dir)
|
||||
}
|
||||
};
|
||||
|
||||
config.input = Input::Empty;
|
||||
config.output = Output::File(output);
|
||||
config.input_format = format;
|
||||
config.output_format = format;
|
||||
config.mount = mount;
|
||||
}
|
||||
None => {
|
||||
// configure input
|
||||
config.input = match args.value_of("INPUT") {
|
||||
Some(input_source) => {
|
||||
if input_source == "-" {
|
||||
@ -144,6 +240,8 @@ fn main() {
|
||||
}
|
||||
None => Input::Stdin,
|
||||
};
|
||||
|
||||
// configure output
|
||||
config.output = if let Some(output) = args.value_of("OUTPUT") {
|
||||
Output::File(PathBuf::from(output))
|
||||
} else if args.is_present("INPLACE") {
|
||||
@ -154,6 +252,12 @@ fn main() {
|
||||
);
|
||||
Output::Stdout
|
||||
}
|
||||
Input::Empty => {
|
||||
warn!(
|
||||
"In-place output `-i` with empty input makes no sense; outputting on STDOUT."
|
||||
);
|
||||
Output::Stdout
|
||||
}
|
||||
Input::File(input_source) => Output::File(input_source.clone()),
|
||||
}
|
||||
} else if args.is_present("NOOUTPUT") || args.is_present("QUIET") {
|
||||
@ -170,7 +274,6 @@ fn main() {
|
||||
error!("Mount point {} does not exist.", mount_point.display());
|
||||
std::process::exit(1);
|
||||
}
|
||||
|
||||
config.cleanup_mount = false;
|
||||
Some(mount_point)
|
||||
}
|
||||
@ -180,17 +283,19 @@ fn main() {
|
||||
error!("You must specify a mount point when reading from stdin.");
|
||||
std::process::exit(1);
|
||||
}
|
||||
Input::Empty => {
|
||||
error!("You must specify a mount point when reading an empty file.");
|
||||
std::process::exit(1);
|
||||
}
|
||||
Input::File(file) => {
|
||||
// If the input is from a file foo.EXT, then try to make a directory foo.
|
||||
let mount_dir = file.with_extension("");
|
||||
|
||||
// If that file already exists, give up and tell the user about --mount.
|
||||
if mount_dir.exists() {
|
||||
error!("Inferred mountpoint '{mount}' for input file '{file}', but '{mount}' already exists. Use `--mount MOUNT` to specify a mountpoint.",
|
||||
mount = mount_dir.display(), file = file.display());
|
||||
std::process::exit(1);
|
||||
}
|
||||
|
||||
// If the mountpoint can't be created, give up and tell the user about --mount.
|
||||
if let Err(e) = std::fs::create_dir(&mount_dir) {
|
||||
error!(
|
||||
@ -200,7 +305,6 @@ fn main() {
|
||||
);
|
||||
std::process::exit(1);
|
||||
}
|
||||
|
||||
// We did it!
|
||||
config.cleanup_mount = true;
|
||||
Some(mount_dir)
|
||||
@ -232,9 +336,9 @@ fn main() {
|
||||
debug!("Inferring format from input.")
|
||||
}
|
||||
};
|
||||
|
||||
match &config.input {
|
||||
Input::Stdin => Format::Json,
|
||||
Input::Empty => Format::Json,
|
||||
Input::File(input_source) => match input_source
|
||||
.extension()
|
||||
.and_then(|s| s.to_str())
|
||||
@ -253,7 +357,6 @@ fn main() {
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
// try to autodetect the output format.
|
||||
//
|
||||
// first see if it's specified and parses okay.
|
||||
@ -279,7 +382,6 @@ fn main() {
|
||||
debug!("Inferring output format from input.")
|
||||
}
|
||||
};
|
||||
|
||||
match args
|
||||
.value_of("OUTPUT")
|
||||
.and_then(|s| Path::new(s).extension())
|
||||
@ -299,6 +401,8 @@ fn main() {
|
||||
}
|
||||
}
|
||||
};
|
||||
}
|
||||
};
|
||||
|
||||
if config.pretty && !config.output_format.can_be_pretty() {
|
||||
warn!(
|
||||
@ -331,18 +435,7 @@ fn main() {
|
||||
};
|
||||
let cleanup_mount = config.cleanup_mount;
|
||||
let input_format = config.input_format;
|
||||
let reader: Box<dyn std::io::Read> = match &config.input {
|
||||
Input::Stdin => Box::new(std::io::stdin()),
|
||||
Input::File(file) => {
|
||||
let fmt = config.input_format;
|
||||
let file = std::fs::File::open(&file).unwrap_or_else(|e| {
|
||||
error!("Unable to open {} for {} input: {}", file.display(), fmt, e);
|
||||
std::process::exit(1);
|
||||
});
|
||||
Box::new(file)
|
||||
}
|
||||
};
|
||||
let fs = input_format.load(reader, config);
|
||||
let fs = input_format.load(config);
|
||||
|
||||
info!("mounting on {:?} with options {:?}", mount, options);
|
||||
fuser::mount2(fs, &mount, &options).unwrap();
|
||||
|
47
tests/auto.sh
Executable file
47
tests/auto.sh
Executable file
@ -0,0 +1,47 @@
|
||||
#!/bin/sh
|
||||
|
||||
fail() {
|
||||
echo FAILED: $1
|
||||
if [ "$MNT" ]
|
||||
then
|
||||
umount "$MNT"
|
||||
rm "$FILE" "$EXP"
|
||||
rmdir "$MNT"
|
||||
fi
|
||||
exit 1
|
||||
}
|
||||
|
||||
MNT=$(mktemp -d)
|
||||
FILE=$(mktemp).json
|
||||
|
||||
echo '{}' >"$FILE"
|
||||
|
||||
EXP=$(mktemp)
|
||||
|
||||
printf '{"favorite_number":47,"likes":{"cats":false,"dogs":true},"mistakes":null,"name":"Michael Greenberg","website":"https://mgree.github.io"}' >"$EXP"
|
||||
|
||||
ffs -m "$MNT" -i "$FILE" &
|
||||
PID=$!
|
||||
sleep 2
|
||||
|
||||
ls "$MNT"
|
||||
[ $(ls $MNT) ] && fail nonempty1
|
||||
[ $(ls $MNT | wc -l) -eq 0 ] || fail nonempty2
|
||||
|
||||
echo 47 >"$MNT"/favorite_number
|
||||
mkdir "$MNT"/likes
|
||||
echo true >"$MNT"/likes/dogs
|
||||
echo false >"$MNT"/likes/cats
|
||||
touch "$MNT"/mistakes
|
||||
echo Michael Greenberg >"$MNT"/name
|
||||
echo https://mgree.github.io >"$MNT"/website
|
||||
|
||||
umount "$MNT" || fail unmount
|
||||
sleep 1
|
||||
kill -0 $PID >/dev/null 2>&1 && fail process
|
||||
|
||||
cat "$FILE"
|
||||
diff "$FILE" "$EXP" || fail diff
|
||||
|
||||
rm "$FILE" "$EXP"
|
||||
rmdir "$MNT"
|
43
tests/new.sh
Executable file
43
tests/new.sh
Executable file
@ -0,0 +1,43 @@
|
||||
#!/bin/sh
|
||||
|
||||
fail() {
|
||||
echo FAILED: $1
|
||||
if [ "$MNT" ]
|
||||
then
|
||||
umount "$MNT"
|
||||
rmdir "$MNT"
|
||||
rm "$OUT" "$EXP"
|
||||
fi
|
||||
exit 1
|
||||
}
|
||||
|
||||
# really, just for the name
|
||||
OUT=$(mktemp)
|
||||
rm "$OUT"
|
||||
MNT="$OUT"
|
||||
OUT="$OUT".json
|
||||
|
||||
EXP=$(mktemp)
|
||||
|
||||
printf '{"handles":{"github":"mgree","stevens":"mgreenbe","twitter":"mgrnbrg"},"problems":99}' >"$EXP"
|
||||
|
||||
ffs --new "$OUT" &
|
||||
PID=$!
|
||||
sleep 2
|
||||
[ "$(ls $MNT)" ] && fail nonempty
|
||||
|
||||
mkdir "$MNT"/handles
|
||||
|
||||
echo mgree >"$MNT"/handles/github
|
||||
echo mgreenbe >"$MNT"/handles/stevens
|
||||
echo mgrnbrg >"$MNT"/handles/twitter
|
||||
echo 99 >"$MNT"/problems
|
||||
|
||||
umount "$MNT" || fail unmount
|
||||
sleep 1
|
||||
kill -0 $PID >/dev/null 2>&1 && fail process
|
||||
|
||||
diff "$OUT" "$EXP" || fail diff
|
||||
|
||||
[ -e "$MNT" ] && fail mount
|
||||
rm "$OUT" "$EXP"
|
Loading…
Reference in New Issue
Block a user