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/* rm.c - remove files
*
* Copyright 2012 Rob Landley <rob@landley.net>
*
* See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/rm.html
USE_RM(NEWTOY(rm, "fiRrv[-fi]", TOYFLAG_BIN))
config RM
bool "rm"
default y
help
usage: rm [-fiRrv] FILE...
Remove each argument from the filesystem.
-f Force: remove without confirmation, no error if it doesn't exist
-i Interactive: prompt for confirmation
-rR Recursive: remove directory contents
-v Verbose
*/
#define FOR_rm
#include "toys.h"
static int do_rm(struct dirtree *try)
{
int fd=dirtree_parentfd(try), dir=S_ISDIR(try->st.st_mode), or=0, using=0;
// Skip . and .. (yes, even explicitly on the command line: posix says to)
if (isdotdot(try->name)) return 0;
// Intentionally fail non-recursive attempts to remove even an empty dir
// (via wrong flags to unlinkat) because POSIX says to.
if (dir && !(toys.optflags & (FLAG_r|FLAG_R))) goto skip;
// This is either the posix section 2(b) prompt or the section 3 prompt.
if (!FLAG(f)
&& (!S_ISLNK(try->st.st_mode) && faccessat(fd, try->name, W_OK, 0))) or++;
// Posix section 1(a), don't prompt for nonexistent.
if (or && errno == ENOENT) goto skip;
if (!(dir && try->again) && ((or && isatty(0)) || FLAG(i))) {
char *s = dirtree_path(try, 0);
fprintf(stderr, "rm %s%s%s", or ? "ro " : "", dir ? "dir " : "", s);
free(s);
or = yesno(0);
if (!or) goto nodelete;
}
// handle directory recursion
if (dir) {
using = AT_REMOVEDIR;
// Handle chmod 000 directories when -f
if (faccessat(fd, try->name, R_OK, 0)) {
if (FLAG(f)) wfchmodat(fd, try->name, 0700);
else goto skip;
}
if (!try->again) return DIRTREE_COMEAGAIN;
if (try->symlink) goto skip;
if (FLAG(i)) {
char *s = dirtree_path(try, 0);
// This is the section 2(d) prompt. (Yes, posix says to prompt twice.)
fprintf(stderr, "rmdir %s", s);
free(s);
or = yesno(0);
if (!or) goto nodelete;
}
}
skip:
if (!unlinkat(fd, try->name, using)) {
if (FLAG(v)) {
char *s = dirtree_path(try, 0);
printf("%s%s '%s'\n", toys.which->name, dir ? "dir" : "", s);
free(s);
}
} else {
if (!dir || try->symlink != (char *)2) perror_msg_raw(try->name);
nodelete:
if (try->parent) try->parent->symlink = (char *)2;
}
return 0;
}
void rm_main(void)
{
char **s;
// Can't use <1 in optstring because zero arguments with -f isn't an error
if (!toys.optc && !FLAG(f)) help_exit("Needs 1 argument");
for (s = toys.optargs; *s; s++) {
if (!strcmp(*s, "/")) {
error_msg("rm /. if you mean it");
continue;
}
// "rm dir/.*" can expand to include .. which generally isn't what you want
if (!strcmp("..", basename(*s))) {
error_msg("bad path %s", *s);
continue;
}
// Files that already don't exist aren't errors for -f. Use lstat() instead
// of faccessat() because bionic doesn't support AT_SYMLINK_NOFOLLOW
if (FLAG(f) && lstat(*s, (void *)toybuf) && errno == ENOENT) continue;
// There's a race here where a file removed between the above check and
// dirtree's stat would report the nonexistence as an error, but that's
// not a normal "it didn't exist" so I'm ok with it.
dirtree_read(*s, do_rm);
}
}
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