shackle_shell/
git.rs

1use crate::{
2    parser::{GitReceivePackArgs, GitUploadPackArgs},
3    user_info::{get_gid, get_user_groups, get_username},
4    ShackleError,
5};
6use git2::{ErrorCode, Repository, RepositoryInitMode, RepositoryInitOptions};
7use std::{
8    fs,
9    os::unix::fs::PermissionsExt,
10    path::{Path, PathBuf},
11    process::Command,
12};
13
14pub struct GitInitResult {
15    pub path: PathBuf,
16}
17
18fn git_dir_prefix() -> PathBuf {
19    PathBuf::from("git")
20}
21
22fn personal_git_dir() -> Result<PathBuf, ShackleError> {
23    let username = get_username().ok_or(ShackleError::UserReadError)?;
24    Ok(git_dir_prefix().join(username))
25}
26
27fn verify_user_is_in_group(group: &str) -> bool {
28    let user_groups = get_user_groups();
29    user_groups.iter().any(|g| g == group)
30}
31
32fn group_git_dir(group: &str) -> PathBuf {
33    git_dir_prefix().join(group)
34}
35
36fn is_valid_git_repo_path(path: &Path) -> Result<bool, ShackleError> {
37    let prefix = git_dir_prefix();
38    let relative_path = match path.strip_prefix(&prefix) {
39        Ok(relative_path) => relative_path,
40        Err(_) => {
41            return Ok(false);
42        }
43    };
44
45    let mut it = relative_path.iter();
46    let group = it.next();
47    let repo_name = it.next();
48    let end = it.next();
49
50    match (group, repo_name, end) {
51        (_, _, Some(_)) | (None, _, _) | (_, None, _) => Ok(false),
52        (Some(group_name), Some(_repo_name), _) => {
53            if relative_path.extension().map(|ext| ext == "git") != Some(true) {
54                Ok(false)
55            } else {
56                let group_name = group_name.to_string_lossy();
57
58                let user_name = get_username();
59                let is_valid_personal_repo_path = user_name
60                    .map(|user_name| user_name == group_name)
61                    .unwrap_or(false);
62
63                let user_groups = get_user_groups();
64                let is_valid_shared_repo_path =
65                    user_groups.iter().any(|group| group.as_ref() == group_name);
66
67                Ok(is_valid_personal_repo_path || is_valid_shared_repo_path)
68            }
69        }
70    }
71}
72
73pub fn init(
74    repo_name: &str,
75    group: &Option<String>,
76    description: &Option<String>,
77    branch: &str,
78) -> Result<GitInitResult, ShackleError> {
79    if let Some(group) = &group {
80        if !verify_user_is_in_group(group) {
81            return Err(ShackleError::InvalidGroup);
82        }
83    }
84
85    let git_prefix = git_dir_prefix();
86    let collection_dir = match group {
87        Some(group) => group_git_dir(group),
88        None => personal_git_dir()?,
89    };
90    let path = collection_dir.join(repo_name).with_extension("git");
91
92    if !git_prefix.is_dir() {
93        fs::create_dir(&git_prefix)?;
94    }
95
96    if !collection_dir.is_dir() {
97        fs::create_dir(&collection_dir)?;
98
99        if let Some(group) = group {
100            let gid = get_gid(&group).expect("User is in group but no group ID?");
101            nix::unistd::chown(&collection_dir, None, Some(gid))?;
102        }
103
104        let mut perms = collection_dir.metadata()?.permissions();
105        perms.set_mode(match group {
106            Some(_) => 0o2770,
107            None => 0o700,
108        });
109        fs::set_permissions(&collection_dir, perms)?;
110    }
111
112    let mut init_opts = RepositoryInitOptions::new();
113    init_opts
114        .bare(true)
115        .mkdir(false)
116        .no_reinit(true)
117        .initial_head(branch);
118    if group.is_some() {
119        init_opts.mode(RepositoryInitMode::SHARED_GROUP);
120    }
121
122    Repository::init_opts(&path, &init_opts)?;
123    if let Some(description) = description {
124        // There is an init option for setting the description but it seems to
125        // just do nothing?
126        set_description(&path, description)?;
127    }
128
129    Ok(GitInitResult { path })
130}
131
132pub struct RepoMetadata {
133    pub path: PathBuf,
134    pub description: String,
135}
136
137pub struct VerboseRepoMetadata {
138    pub path: PathBuf,
139    pub description: String,
140    pub size: u64,
141}
142
143fn get_size(path: impl AsRef<Path>) -> Result<u64, ShackleError> {
144    let path_metadata = path.as_ref().symlink_metadata()?;
145
146    if path_metadata.is_dir() {
147        let mut size_in_bytes = path_metadata.len();
148        for entry in path.as_ref().read_dir()? {
149            let entry = entry?;
150            let entry_metadata = entry.metadata()?;
151
152            if entry_metadata.is_dir() {
153                size_in_bytes += get_size(entry.path())?;
154            } else {
155                size_in_bytes += entry_metadata.len();
156            }
157        }
158        Ok(size_in_bytes)
159    } else {
160        Ok(path_metadata.len())
161    }
162}
163
164pub fn list() -> Result<Vec<RepoMetadata>, ShackleError> {
165    fn add_from_dir(
166        collection_dir: &Path,
167        is_checking_group: bool,
168    ) -> Result<Vec<RepoMetadata>, ShackleError> {
169        let mut results = Vec::new();
170        if !collection_dir.is_dir() {
171            return Ok(results);
172        }
173
174        for dir in collection_dir.read_dir()? {
175            let path = dir?.path();
176            let description_path = path.join("description");
177            let has_git_ext = path.extension().map_or(false, |ext| ext == "git");
178
179            if has_git_ext {
180                if let Ok(repo) = Repository::open_bare(&path) {
181                    let config = repo.config()?.snapshot()?;
182                    let shared_config = config.get_str("core.sharedRepository").or_else(|e| {
183                        if e.code() == ErrorCode::NotFound {
184                            Ok("")
185                        } else {
186                            Err(e)
187                        }
188                    })?;
189                    let is_group_shared =
190                        [Some("group"), Some("1"), Some("true")].contains(&Some(shared_config));
191
192                    if is_group_shared == is_checking_group {
193                        let description = if description_path.is_file() {
194                            fs::read_to_string(description_path)?
195                        } else {
196                            String::new()
197                        };
198
199                        results.push(RepoMetadata { path, description });
200                    }
201                }
202            }
203        }
204        Ok(results)
205    }
206
207    let mut results = Vec::new();
208
209    results.append(&mut add_from_dir(&personal_git_dir()?, false)?);
210    let groups = get_user_groups();
211    for group in &groups {
212        results.append(&mut add_from_dir(&group_git_dir(group), true)?);
213    }
214
215    Ok(results)
216}
217
218pub fn list_verbose() -> Result<Vec<VerboseRepoMetadata>, ShackleError> {
219    list()?
220        .into_iter()
221        .map(|meta| {
222            get_size(&meta.path).map(|size| VerboseRepoMetadata {
223                path: meta.path,
224                description: meta.description,
225                size,
226            })
227        })
228        .collect()
229}
230
231pub fn set_description(directory: &Path, description: &str) -> Result<(), ShackleError> {
232    if !is_valid_git_repo_path(directory)? {
233        return Err(ShackleError::InvalidDirectory);
234    }
235
236    let description_path = directory.join("description");
237    if description_path.is_file() {
238        fs::write(description_path, description).map_err(|e| e.into())
239    } else {
240        Err(ShackleError::InvalidDirectory)
241    }
242}
243
244pub fn set_branch(directory: &Path, branch: &str) -> Result<(), ShackleError> {
245    if !is_valid_git_repo_path(directory)? {
246        return Err(ShackleError::InvalidDirectory);
247    }
248
249    if let Ok(repo) = Repository::open_bare(directory) {
250        repo.reference_symbolic(
251            "HEAD",
252            &format!("refs/heads/{branch}"),
253            true,
254            "shackle set-branch",
255        )?;
256        Ok(())
257    } else {
258        Err(ShackleError::InvalidDirectory)
259    }
260}
261
262pub fn housekeeping(directory: &Path) -> Result<(), ShackleError> {
263    if !is_valid_git_repo_path(directory)? {
264        return Err(ShackleError::InvalidDirectory);
265    }
266
267    Command::new("git")
268        .arg("gc")
269        .arg("--prune=now")
270        .current_dir(directory)
271        .spawn()?
272        .wait()?;
273
274    Ok(())
275}
276
277pub fn delete(directory: &Path) -> Result<(), ShackleError> {
278    if !is_valid_git_repo_path(directory)? {
279        return Err(ShackleError::InvalidDirectory);
280    }
281
282    if Repository::open_bare(directory).is_ok() {
283        fs::remove_dir_all(directory)?;
284        Ok(())
285    } else {
286        Err(ShackleError::InvalidDirectory)
287    }
288}
289
290pub fn upload_pack(upload_pack_args: &GitUploadPackArgs) -> Result<(), ShackleError> {
291    if !is_valid_git_repo_path(&upload_pack_args.directory)? {
292        return Err(ShackleError::InvalidDirectory);
293    }
294
295    let mut command = Command::new("git-upload-pack");
296    command.arg("--strict");
297
298    if let Some(timeout) = upload_pack_args.timeout {
299        command.args(["--timeout", &timeout.to_string()]);
300    }
301    if upload_pack_args.stateless_rpc {
302        command.arg("--stateless-rpc");
303    }
304    if upload_pack_args.advertise_refs {
305        command.arg("--advertise-refs");
306    }
307    command.arg(&upload_pack_args.directory);
308
309    command.spawn()?.wait()?;
310    Ok(())
311}
312
313pub fn receive_pack(receive_pack_args: &GitReceivePackArgs) -> Result<(), ShackleError> {
314    if !is_valid_git_repo_path(&receive_pack_args.directory)? {
315        return Err(ShackleError::InvalidDirectory);
316    }
317
318    let mut command = Command::new("git-receive-pack");
319    command.arg(&receive_pack_args.directory);
320
321    command.spawn()?.wait()?;
322    Ok(())
323}
shackle_shell/git.rs

shackle_shell/
git.rs
