password utils: improve --help, make DEFAULT_PASSWD_ALGO visible if CHPASSWD

Was:
    $ cryptpw --help
    ...
    Print crypt(3) hashed PASSWORD

        -P,--password-fd=N	Read password from fd N
        -m,--method=TYPE	Encryption method
        -S,--salt=SALT

User: "What methods exist? which one os default?"

Now:
    Print crypt(3) hashed PASSWORD

        -P,--password-fd N	Read password from fd N
        -m,--method TYPE	des,md5,sha256/512 (default des)
        -S,--salt SALT

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

4 files changed, 19 insertions, 11 deletions

diff --git a/include/usage.src.h b/include/usage.src.h
index 78beccf4d..00369dfb3 100644
--- a/include/usage.src.h
+++ b/include/usage.src.h
@@ -14,6 +14,14 @@
 
 #define NOUSAGE_STR "\b"
 
+#if !ENABLE_USE_BB_CRYPT || ENABLE_USE_BB_CRYPT_SHA
+# define CRYPT_METHODS_HELP_STR "des,md5,sha256/512" \
+        " (default "CONFIG_FEATURE_DEFAULT_PASSWD_ALGO")"
+#else
+# define CRYPT_METHODS_HELP_STR "des,md5" \
+        " (default "CONFIG_FEATURE_DEFAULT_PASSWD_ALGO")"
+#endif
+
 INSERT
 
 #define busybox_notes_usage \
diff --git a/loginutils/chpasswd.c b/loginutils/chpasswd.c
index 2d268be67..baafd35c8 100644
--- a/loginutils/chpasswd.c
+++ b/loginutils/chpasswd.c
@@ -13,9 +13,9 @@
 //config:         and uses this information to update a group of existing users.
 //config:
 //config:config FEATURE_DEFAULT_PASSWD_ALGO
-//config:       string "Default password encryption method (passwd -a, cryptpw -m parameter)"
+//config:       string "Default encryption method (passwd -a, cryptpw -m, chpasswd -c ALG)"
 //config:       default "des"
-//config:       depends on PASSWD || CRYPTPW
+//config:       depends on PASSWD || CRYPTPW || CHPASSWD
 //config:       help
 //config:         Possible choices are "d[es]", "m[d5]", "s[ha256]" or "sha512".
 
@@ -29,13 +29,13 @@
 //usage:       "Read user:password from stdin and update /etc/passwd\n"
 //usage:        IF_LONG_OPTS(
 //usage:     "\n        -e,--encrypted          Supplied passwords are in encrypted form"
-//usage:     "\n        -m,--md5                Use MD5 encryption instead of DES"
-//usage:     "\n        -c,--crypt-method       Use the specified method to encrypt the passwords"
+//usage:     "\n        -m,--md5                Eencrypt using md5, not des"
+//usage:     "\n        -c,--crypt-method ALG   "CRYPT_METHODS_HELP_STR
 //usage:        )
 //usage:        IF_NOT_LONG_OPTS(
 //usage:     "\n        -e      Supplied passwords are in encrypted form"
-//usage:     "\n        -m      Use MD5 encryption instead of DES"
-//usage:     "\n        -c      Use the specified method to encrypt the passwords"
+//usage:     "\n        -m      Eencrypt using md5, not des"
+//usage:     "\n        -c ALG  "CRYPT_METHODS_HELP_STR
 //usage:        )
 
 #include "libbb.h"
diff --git a/loginutils/cryptpw.c b/loginutils/cryptpw.c
index d630231c6..696e169fc 100644
--- a/loginutils/cryptpw.c
+++ b/loginutils/cryptpw.c
@@ -37,15 +37,15 @@
 //usage:#define cryptpw_full_usage "\n\n"
 //usage:       "Print crypt(3) hashed PASSWORD\n"
 //usage:        IF_LONG_OPTS(
-//usage:     "\n        -P,--password-fd=N      Read password from fd N"
+//usage:     "\n        -P,--password-fd N      Read password from fd N"
 /* //usage:  "\n        -s,--stdin              Use stdin; like -P0" */
-//usage:     "\n        -m,--method=TYPE        Encryption method"
-//usage:     "\n        -S,--salt=SALT"
+//usage:     "\n        -m,--method TYPE        "CRYPT_METHODS_HELP_STR
+//usage:     "\n        -S,--salt SALT"
 //usage:        )
 //usage:        IF_NOT_LONG_OPTS(
 //usage:     "\n        -P N    Read password from fd N"
 /* //usage:  "\n        -s      Use stdin; like -P0" */
-//usage:     "\n        -m TYPE Encryption method TYPE"
+//usage:     "\n        -m TYPE "CRYPT_METHODS_HELP_STR
 //usage:     "\n        -S SALT"
 //usage:        )
 
diff --git a/loginutils/passwd.c b/loginutils/passwd.c
index 52b66ca50..b7b7423fd 100644
--- a/loginutils/passwd.c
+++ b/loginutils/passwd.c
@@ -32,7 +32,7 @@
 //usage:#define passwd_full_usage "\n\n"
 //usage:       "Change USER's password (default: current user)"
 //usage:     "\n"
-//usage:     "\n        -a ALG  Encryption method"
+//usage:     "\n        -a ALG  "CRYPT_METHODS_HELP_STR
 //usage:     "\n        -d      Set password to ''"
 //usage:     "\n        -l      Lock (disable) account"
 //usage:     "\n        -u      Unlock (enable) account"