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If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If the program does terminal interaction, make it output a short +notice like this when it starts in an interactive mode: + + Copyright (C) + This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, your program's commands +might be different; for a GUI interface, you would use an "about box". + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU GPL, see +. + + The GNU General Public License does not permit incorporating your program +into proprietary programs. If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. diff --git a/README.md b/README.md index e803795..61b4be1 100644 --- a/README.md +++ b/README.md @@ -1,5 +1,7 @@ # Picobak +**WARNING:** this program hasn't properly been tested yet. Use with extreme caution. It might eat your kittens for now!! + Picobak is a small CLI utility to help you backup and organize your pictures on a filesystem. It uses the pictures [EXIF](https://en.wikipedia.org/wiki/Exif) metadata to store the files in a `year/month/day` directory tree like this: ```txt @@ -23,7 +25,16 @@ This program is heavily inspired by Shotwell's backup feature. I actually used t Overall: ```txt -picobak BACKUP_ROOT PICTURE_TO_BACKUP +Usage: pictures-backup [OPTIONS] + +Arguments: + Pictures library directory + Picture to backup + +Options: + -d, --dry-run Do not create any directory or copy any file. Only prints out the operations it would perform + -h, --help Print help + -V, --version Print version ``` You can couple this tool with [GNU parallel](https://www.gnu.org/software/parallel/) to concurently backup multiple images and fully utilize a multicore system: diff --git a/src/main.rs b/src/main.rs index e7a11a9..da9fee1 100644 --- a/src/main.rs +++ b/src/main.rs @@ -1,3 +1,121 @@ -fn main() { - println!("Hello, world!"); +use std::fs::{create_dir_all, copy}; +use std::{fs::File, path::PathBuf}; +use std::path::Path; + +use clap::Parser; +use exif::{Tag, In, Value, DateTime}; + +#[derive(Parser, Debug)] +#[command(author, version, about, long_about = None)] +struct CliArgs { + /// Pictures library directory + backup_root: String, + /// Picture to backup + file_path: String, + /// Do not create any directory or copy any file. Only prints out the operations it would perform + #[arg(short, long)] + dry_run: bool +} + +fn main() { + let cli = CliArgs::parse(); + + if !cli.dry_run { + validate_args(&cli); + } + + let filename = Path::new(&cli.file_path); + let file = File::open(&filename).expect(&format!("ERROR: cannot open the {} file", &cli.file_path)); + let datetime = get_picture_datetime(&cli.file_path, &file); + let picture_dir = find_backup_dir(&cli.backup_root, &datetime); + + if !picture_dir.exists() { + if !cli.dry_run { + create_dir_all(&picture_dir) + .expect(&format!("ERROR: cannot create directory at {}", &picture_dir.display())); + } else { + eprint!("Would mkdir {}", &picture_dir.display()); + } + } else if !picture_dir.is_dir() { + panic!("ERROR: {} already exists and is not a directory", &picture_dir.display()) + } + + let target_filename = picture_dir + .join(filename.file_name() + .expect(&format!("Error: Incorrect file name {}", filename.display()))); + if !target_filename.is_file() { + if !cli.dry_run { + copy(&filename, &target_filename) + .expect(&format!("ERROR: cannot copy {} to {}", &filename.display(), &target_filename.display())); + } else { + eprint!("Would copy {} to {}", filename.display(), target_filename.display()); + } + } else { + if same_files(&filename, &target_filename) { + eprint!("File already archived: {}", &filename.display()) + } else { + panic!("ERROR: {} already exists in {}, but the two files are different", + &filename.display(), + &target_filename.display()) + } + } +} + +/// Retrieves when the picture has been shot from the EXIF metadata. +fn get_picture_datetime(file_path: &str, file: &File) -> DateTime { + let mut bufreader = std::io::BufReader::new(file); + let exifreader = exif::Reader::new(); + let exif = exifreader.read_from_container(&mut bufreader) + .expect(&format!("ERROR: cannot read EXIF metadata for picture {}", file_path)); + let datetime_field = exif.get_field(Tag::DateTimeOriginal, In::PRIMARY) + .expect(&format!("ERROR: missing datetime tag for picture {}", file_path)); + match datetime_field.value { + Value::Ascii(ref vec) if !vec.is_empty() => + if let Ok(datetime) = DateTime::from_ascii(&vec[0]) { + datetime + } else { + panic!("ERROR: incorrect datetime format for file {}", file_path) + } + _ => + panic!("ERROR: cannot parse ASCII from datetime EXIF field for file {}", file_path) + } +} + +/// Directory in which we want to save the picture. +fn find_backup_dir(backup_root: &str, datetime: &DateTime) -> PathBuf { + let backup_root = Path::new(backup_root); + backup_root + .join(datetime.year.to_string()) + .join(datetime.month.to_string()) + .join(datetime.day.to_string()) +} + +/// Sanity function making sure the user did not give us complete +/// garbage data. +fn validate_args(args: &CliArgs) { + if !Path::new(&args.file_path).is_file() { + panic!("ERROR: {} is not a file", &args.file_path); + }; + if Path::new(&args.backup_root).is_file() { + panic!("ERROR: {} is a file, not a valid backup dir", &args.file_path); + }; +} + +/// Compare two files and check if they're the same. We're not really +/// comparing the whole file, it'd be too expensive. We assume that if +/// two pictures have the same EXIF data, the same size and the same +/// creation date, they're the same. +fn same_files(source: &Path, target: &Path) -> bool { + let source_file = File::open(&source) + .expect(&format!("Error: cannot open file {}", &source.display())) + .metadata() + .expect(&format!("Error: cannot get metadata of file {}", &source.display())); + let target_file = File::open(&target) + .expect(&format!("Error: cannot open file {}", &target.display())) + .metadata() + .expect(&format!("Error: cannot get metadata of file {}", &target.display())); + let source_created = source_file.created().expect(&format!("ERROR: cannot find created datetime for {}", &source.display())); + let target_created = target_file.created().expect(&format!("ERROR: cannot find created datetime for {}", &target.display())); + + source_file.len() == target_file.len() && source_created == target_created }