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Add chown(1).

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Jonas 'Sortie' Termansen 2020-09-28 22:42:34 +02:00
parent 6774df5756
commit 8337947058
2 changed files with 337 additions and 0 deletions
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1
utils/Makefile
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@ -15,6 +15,7 @@ basename \
cat \ cat \
chkblayout \ chkblayout \
chmod \ chmod \
chown \
chvideomode \ chvideomode \
clear \ clear \
colormake \ colormake \

336
utils/chown.c Normal file
View file

@ -0,0 +1,336 @@
/*
* Copyright (c) 2020 Jonas 'Sortie' Termansen.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* chown.c
* Change file ownership and group.
*/
#include <sys/stat.h>
#include <dirent.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <grp.h>
#include <inttypes.h>
#include <pwd.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
static const int FLAG_CHANGES = 1 << 0;
static const int FLAG_VERBOSE = 1 << 1;
static const int FLAG_RECURSIVE = 1 << 2;
static const int FLAG_NOFOLLOW = 1 << 3;
enum symderef
{
SYMDEREF_NONE,
SYMDEREF_ARGUMENTS,
SYMDEREF_ALWAYS,
SYMDEREF_DEFAULT,
};
static bool do_chown_directory(int fd,
const char* path,
const char* ownerspec,
uid_t uid,
const char* groupspec,
gid_t gid,
int flags,
enum symderef symderef);
static bool do_chown(int dirfd,
const char* relpath,
const char* path,
const char* ownerspec,
uid_t uid,
const char* groupspec,
gid_t gid,
int flags,
enum symderef symderef)
{
bool success = true;
int fd_open_flags = O_RDONLY;
if ( symderef == SYMDEREF_NONE )
fd_open_flags |= O_SYMLINK_NOFOLLOW;
int fd = openat(dirfd, relpath, fd_open_flags);
if ( fd < 0 )
{
warn("%s", path);
return false;
}
struct stat st;
if ( fstat(fd, &st) < 0 )
{
warn("stat: %s", path);
close(fd);
return false;
}
if ( S_ISLNK(st.st_mode) )
{
close(fd);
return true;
}
if ( fchown(fd, uid, gid) < 0 )
{
if ( uid == (uid_t) -1 )
warn("changing group to %s: %s", groupspec, path);
else if ( gid == (gid_t) -1 )
warn("changing owner to %s: %s", ownerspec, path);
else
warn("changing owner to %s and group to %s: %s", ownerspec,
groupspec, path);
success = false;
}
else
{
if ( uid != (uid_t) -1 &&
((flags & FLAG_VERBOSE) ||
(st.st_uid != uid && (flags & FLAG_CHANGES)) ))
{
if ( st.st_uid == uid )
printf("owner of `%s' retained as %s\n", path, ownerspec);
else
{
struct passwd* pwd = getpwuid(st.st_uid);
if ( pwd )
printf("owner of `%s' changed from %s to %s\n",
path, pwd->pw_name, ownerspec);
else
printf("owner of `%s' changed from %ju to %s\n",
path, (uintmax_t) st.st_uid, ownerspec);
}
}
if ( gid != (gid_t) -1 &&
((flags & FLAG_VERBOSE) ||
(st.st_gid != gid && (flags & FLAG_CHANGES)) ))
{
if ( st.st_gid == gid )
printf("group of `%s' retained as %s\n",
path, groupspec);
else
{
struct group* grp = getgrgid(st.st_gid);
if ( grp )
printf("group of `%s' changed from %s to %s\n",
path, grp->gr_name, groupspec);
else
printf("group of `%s' changed from %ju to %s\n",
path, (uintmax_t) st.st_gid, groupspec);
}
}
}
if ( S_ISDIR(st.st_mode) && (flags & FLAG_RECURSIVE) )
{
if ( !do_chown_directory(fd, path, ownerspec, uid, groupspec, gid,
flags, symderef) )
success = false;
}
close(fd);
return success;
}
static bool do_chown_directory(int fd,
const char* path,
const char* ownerspec,
uid_t uid,
const char* groupspec,
gid_t gid,
int flags,
enum symderef symderef)
{
if ( symderef == SYMDEREF_ARGUMENTS )
symderef = SYMDEREF_NONE;
int fd_copy = dup(fd);
if ( fd_copy < 0 )
{
warn("dup: %s", path);
return false;
}
DIR* dir = fdopendir(fd_copy);
if ( !dir )
{
warn("fdopendir: %s", path);
close(fd_copy);
return false;
}
const char* joiner = "/";
size_t path_length = strlen(path);
if ( path_length && path[path_length - 1] == '/' )
joiner = "";
bool success = true;
struct dirent* entry;
while ( (errno = 0, entry = readdir(dir)) )
{
if ( !strcmp(entry->d_name, ".") || !strcmp(entry->d_name, "..") )
continue;
char* entry_path;
if ( asprintf(&entry_path, "%s%s%s", path, joiner, entry->d_name) < 0 )
{
warn("asprintf: `%s%s%s'", path, joiner, entry->d_name);
success = false;
continue;
}
if ( !do_chown(fd, entry->d_name, entry_path, ownerspec, uid, groupspec,
gid, flags, symderef) )
success = false;
free(entry_path);
}
if ( errno != 0 )
{
warn("reading directory: %s", path);
closedir(dir);
return false;
}
closedir(dir);
return success;
}
static void compact_arguments(int* argc, char*** argv)
{
for ( int i = 0; i < *argc; i++ )
{
while ( i < *argc && !(*argv)[i] )
{
for ( int n = i; n < *argc; n++ )
(*argv)[n] = (*argv)[n+1];
(*argc)--;
}
}
}
int main(int argc, char* argv[])
{
int flags = 0;
enum symderef symderef = SYMDEREF_DEFAULT;
for ( int i = 1; i < argc; i++ )
{
const char* arg = argv[i];
if ( arg[0] != '-' || !arg[1] )
continue;
argv[i] = NULL;
if ( !strcmp(arg, "--") )
break;
if ( arg[1] != '-' )
{
char c;
while ( (c = *++arg) ) switch ( c )
{
case 'c': flags |= FLAG_CHANGES; break;
case 'h': flags |= FLAG_NOFOLLOW; break;
case 'H': symderef = SYMDEREF_ARGUMENTS; break;
case 'L': symderef = SYMDEREF_ALWAYS; break;
case 'P': symderef = SYMDEREF_NONE; break;
case 'R': flags |= FLAG_RECURSIVE; break;
case 'v': flags |= FLAG_VERBOSE; break;
default:
errx(1, "unknown option -- '%c'", c);
}
}
else if ( !strcmp(arg, "--changes") )
flags |= FLAG_CHANGES;
else if ( !strcmp(arg, "--verbose") )
flags |= FLAG_VERBOSE;
else if ( !strcmp(arg, "--recursive") )
flags |= FLAG_RECURSIVE;
else
errx(1, "unknown option: %s", arg);
}
compact_arguments(&argc, &argv);
if ( (flags & FLAG_RECURSIVE) && (flags & FLAG_NOFOLLOW) )
errx(1, "the -R and -h options are mutually incompatible");
if ( flags & FLAG_RECURSIVE )
{
if ( symderef == SYMDEREF_DEFAULT )
symderef = SYMDEREF_NONE;
}
else
symderef = flags & FLAG_NOFOLLOW ? SYMDEREF_NONE : SYMDEREF_ALWAYS;
if ( argc == 1 )
errx(1, "missing operand");
char* spec = argv[1];
uid_t uid = (uid_t) -1;
gid_t gid = (gid_t) -1;
size_t offset = strcspn(spec, ":");
const char* ownerspec = spec;
const char* groupspec = spec[offset] ? spec + offset + 1 : "";
spec[offset] = '\0';
char* end;
if ( ownerspec[0] )
{
errno = 0;
uid = strtoumax(ownerspec, &end, 10);
if ( errno || *end )
{
struct passwd* pwd = getpwnam(ownerspec);
if ( !pwd )
err(1, "no such user: %s", ownerspec);
uid = pwd->pw_uid;
}
}
if ( groupspec[0] )
{
errno = 0;
gid = strtoumax(groupspec, &end, 10);
if ( errno || *end )
{
struct group* grp = getgrnam(groupspec);
if ( !grp )
err(1, "no such user: %s", groupspec);
gid = grp->gr_gid;
}
}
if ( uid == (uid_t) -1 && gid == (gid_t) -1 )
errx(1, "a new owner and/or group must be specified");
if ( argc == 2 )
errx(1, "missing operand after `%s'", spec);
bool success = true;
for ( int i = 2; i < argc; i++ )
{
const char* arg = argv[i];
if ( !do_chown(AT_FDCWD, arg, arg, ownerspec, uid, groupspec, gid,
flags, symderef) )
success = false;
}
return success ? 0 : 1;
}