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path: Reduce syscalls for special permissions

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This

1. Skips access() if we only have "special" permissions like the owner
that need stat
2. Does the geteuid()/getegid() *once* outside of filter_path, if we
need it

In the extreme case of `path filter --perm user,group` it will remove
3 syscalls per file.
This commit is contained in:
Fabian Boehm 2023-11-09 19:28:43 +01:00
parent 1c2440c3ac
commit 9d1c0da773
1 changed files with 20 additions and 5 deletions
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25
fish-rust/src/builtins/path.rs
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@ -731,7 +731,7 @@ fn path_sort(parser: &Parser, streams: &mut IoStreams, args: &mut [&wstr]) -> Op
STATUS_CMD_OK
}
fn filter_path(opts: &Options, path: &wstr) -> bool {
fn filter_path(opts: &Options, path: &wstr, uid: Option<u32>, gid: Option<u32>) -> bool {
// TODO: Add moar stuff:
// fifos, sockets, size greater than zero, setuid, ...
// Nothing to check, file existence is checked elsewhere.
@ -791,7 +791,8 @@ fn filter_path(opts: &Options, path: &wstr) -> bool {
}
// access returns 0 on success,
// -1 on failure. Yes, C can't even keep its bools straight.
if waccess(path, amode) != 0 {
// Skip this if we don't have a mode to check - the stat can do existence too.
if amode != 0 && waccess(path, amode) != 0 {
return false;
}
@ -809,9 +810,9 @@ fn filter_path(opts: &Options, path: &wstr) -> bool {
return false;
} else if perm.contains(PermFlags::SGID) && (md.mode() as mode_t & S_ISGID) == 0 {
return false;
} else if perm.contains(PermFlags::USER) && geteuid() != md.uid() {
} else if perm.contains(PermFlags::USER) && uid != Some(md.uid()) {
return false;
} else if perm.contains(PermFlags::GROUP) && getegid() != md.gid() {
} else if perm.contains(PermFlags::GROUP) && gid != Some(md.gid()) {
return false;
}
}
@ -847,8 +848,22 @@ fn path_filter_maybe_is(
true => SplitBehavior::Null,
false => SplitBehavior::InferNull,
});
// If we're looking for the owner/group, get our euid/egid here once.
let uid = if opts.perms.unwrap_or_default().contains(PermFlags::USER) {
Some(geteuid())
} else {
None
};
let gid = if opts.perms.unwrap_or_default().contains(PermFlags::GROUP) {
Some(getegid())
} else {
None
};
for (arg, _) in arguments.filter(|(f, _)| {
(opts.perms.is_none() && opts.types.is_none()) || (filter_path(&opts, f) != opts.invert)
(opts.perms.is_none() && opts.types.is_none())
|| (filter_path(&opts, f, uid, gid) != opts.invert)
}) {
// If we don't have filters, check if it exists.
if opts.perms.is_none() && opts.types.is_none() {