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chmod: Implement X perm symbol

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Instead of clearing the format bits before calling parsemode, leave
them in so we can differentiate between directories and other files,
then clear the format bits in the result.
This commit is contained in:
Michael Forney 2020-01-06 13:08:38 -08:00
parent e5284b1537
commit f3d05ffd0a
3 changed files with 11 additions and 5 deletions
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4
chmod.1
View File

@ -47,7 +47,7 @@ If
.Ar mode
is
.Em symbolic
"[ugoa]*[+-=][rwxst]*"
"[ugoa]*[+-=][rwxXst]*"
.Bl -tag -width Ds
.It u|g|o|a
owner | group | other (non-group) | everyone
@ -55,6 +55,8 @@ owner | group | other (non-group) | everyone
add | remove | set
.It r|w|x|s|t
read | write | execute | setuid and setgid | sticky
.It X
execute, if directory or at least one execute bit is already set
.El
.Sh OPTIONS
.Bl -tag -width Ds

6
chmod.c
View File

@ -13,7 +13,7 @@ chmodr(const char *path, struct stat *st, void *data, struct recursor *r)
{
mode_t m;
m = parsemode(modestr, st->st_mode & ~S_IFMT, mask);
m = parsemode(modestr, st->st_mode, mask);
if (chmod(path, m) < 0) {
weprintf("chmod %s:", path);
ret = 1;
@ -50,8 +50,8 @@ main(int argc, char *argv[])
case 'P':
r.follow = (*argv)[i];
break;
case 'r': case 'w': case 'x': case 's': case 't':
/* -[rwxst] are valid modes, so we're done */
case 'r': case 'w': case 'x': case 'X': case 's': case 't':
/* -[rwxXst] are valid modes, so we're done */
if (i == 1)
goto done;
/* fallthrough */

6
libutil/mode.c
View File

@ -113,6 +113,10 @@ next:
case 'x':
perm |= S_IXUSR|S_IXGRP|S_IXOTH;
break;
case 'X':
if (S_ISDIR(mode) || mode & (S_IXUSR|S_IXGRP|S_IXOTH))
perm |= S_IXUSR|S_IXGRP|S_IXOTH;
break;
case 's':
perm |= S_ISUID|S_ISGID;
break;
@ -144,5 +148,5 @@ apply:
goto next;
}
}
return mode;
return mode & ~S_IFMT;
}