Add Alpine/musl target files

.gitattributes

@@ -1,5 +1,7 @@
-*               text eol=lf
+*                       text eol=lf
 
-su-exec         -text
-su-exec-shared  -text
-su-exec-static  -text
+su-exec                 -text
+su-exec-glibc-shared    -text
+su-exec-glibc-static    -text
+su-exec-musl-shared     -text
+su-exec-musl-static     -text

README.md

@@ -29,35 +29,67 @@ $ su-exec nginx:122 /usr/sbin/nginx -c /etc/nginx/nginx.conf
 ## Why reinvent gosu/su-exec ?
 
 This does more or less exactly the same thing as [gosu](https://github.com/tianon/gosu)
-but it is only 0.6MB (7KB for shared version) instead of 2.2MB.
+but it is only 40KB (7KB for shared version) instead of 2.2MB.
 In particular, the simple C program has a smaller attack plane.
 
 The [`ncopa's su-exec`](https://github.com/ncopa/su-exec) have critical bugs (or features),
-it will **use root permission silently** if given invalid user-spec !
+it will **use root permission silently** if invalid user-spec given !
 
 # Download from IPFS (InterPlanetary File System)
 ## IPFS hash
 ```
-# touch -d "1970-01-01 00:00:00" su-exec-shared su-exec-static
+# touch -d "1970-01-01 00:00:00" su-exec-*
 
-# ls -la su-exec-shared su-exec-static
--rwxr-xr-x 1 root root   6960 Jan  1  1970 su-exec-shared
--rwxr-xr-x 1 root root 609376 Jan  1  1970 su-exec-static
+# ls -la su-exec-*
+-rwxr-xr-x 1 dongsheng dongsheng   6960 Jan  1  1970 su-exec-glibc-shared
+-rwxr-xr-x 1 dongsheng dongsheng 609376 Jan  1  1970 su-exec-glibc-static
+-rwxr-xr-x 1 dongsheng dongsheng   9880 Jan  1  1970 su-exec-musl-shared
+-rwxr-xr-x 1 dongsheng dongsheng  38648 Jan  1  1970 su-exec-musl-static
 
 # ipfs add su-exec-shared su-exec-static
-added QmWcck5mQqbzcEx8mM6bdDestYwqiwsXkCVa97odggk9Vy su-exec-shared
-added QmX3bzvCM3cxFFWGGMhQnMV214HLzyFceD6Vyf2aRYW7NB su-exec-static
+added QmWcck5mQqbzcEx8mM6bdDestYwqiwsXkCVa97odggk9Vy su-exec-glibc-shared
+added QmX3bzvCM3cxFFWGGMhQnMV214HLzyFceD6Vyf2aRYW7NB su-exec-glibc-static
+added QmdEvCUAUnnaTD4ffwDuanS43FPZZgoCF55DtBgpuoqFQR su-exec-musl-shared
+added QmbB7MKHgsx2ZPSmnJJAiu4qDB19v5TtZPhYcfVZydG8Mk su-exec-musl-static
+```
+## GnuPG / OpenPGP sign
+```
+Primary key fingerprint: 3DA8 ECBB 5757 2D64 9F3C  0811 0401 AA20 46D3 97FF
+     Subkey fingerprint: 4073 E993 3572 FC25 1915  5A19 D256 8959 D1DA A566
+
+-----BEGIN PGP SIGNED MESSAGE-----
+Hash: SHA512
+
+SHA256 (su-exec-glibc-shared) = fed1ba22bb0e5b933efb25f2f9e57e7b3069715423ef693a162d9a01bcb040d7
+SHA256 (su-exec-glibc-static) = 59382e38117fc5c001b7d716e53f376cffa50de63c218c03bd213bce4bca5f73
+SHA256 (su-exec-musl-shared) = ed6e097a0122d4027238c6927f634b5ac13691c3116ed693cfb7b982b41a48e6
+SHA256 (su-exec-musl-static) = 79dd71246b7a6aa1867df1ac0ccde9b9771995fa2bd86e74a0e110244512e67f
+-----BEGIN PGP SIGNATURE-----
+
+iQEzBAEBCgAdFiEEQHPpkzVy/CUZFVoZ0laJWdHapWYFAlxmrUQACgkQ0laJWdHa
+pWaDMAgAuQQ05YcSotSnSkiq7k58gCJX/CGd1LV8bkajfGvyhAqD3YQuaB2/IS2o
+QjKqSOKnxj7JLde9/O2elnEHhRgs8u6U2a8yK0NcpY8QgOdglMhydiz4CrXBVe9Q
+XdYpHwVZalAnfpSFxq7x3JtQkpeXEteL/8mMBtandc24CVoWkr+A0RjdAzkMOm+l
+vd4htpnn1ZspoUHLUSt5WtXbHtXRHC230Zh+h3sw2rig7+1c6hf/aELz+Z5MYKEN
+rf1w0X5otySN+yINBp21PquM1vXw0KxVj/rGkBeY0Y+mKOkToNYRsiKqDubmtKL0
+Bqm4QcWjSnZxitwI1MLZUO0a2Do1ag==
+=/Qr+
+-----END PGP SIGNATURE-----
 ```
 
 ## Download from IPFS
 ```
-# ipfs get -o su-exec-shared QmWcck5mQqbzcEx8mM6bdDestYwqiwsXkCVa97odggk9Vy
-# ipfs get -o su-exec-static QmX3bzvCM3cxFFWGGMhQnMV214HLzyFceD6Vyf2aRYW7NB
+ipfs get -o su-exec-glibc-shared QmWcck5mQqbzcEx8mM6bdDestYwqiwsXkCVa97odggk9Vy
+ipfs get -o su-exec-glibc-static QmX3bzvCM3cxFFWGGMhQnMV214HLzyFceD6Vyf2aRYW7NB
+ipfs get -o su-exec-musl-shared  QmdEvCUAUnnaTD4ffwDuanS43FPZZgoCF55DtBgpuoqFQR
+ipfs get -o su-exec-musl-static  QmbB7MKHgsx2ZPSmnJJAiu4qDB19v5TtZPhYcfVZydG8Mk
 ```
 
 ## Download from IPFS gateway
 ### cloudflare-ipfs.com
 ```
-curl -o su-exec-shared https://cloudflare-ipfs.com/ipfs/QmWcck5mQqbzcEx8mM6bdDestYwqiwsXkCVa97odggk9Vy
-curl -o su-exec-static https://cloudflare-ipfs.com/ipfs/QmX3bzvCM3cxFFWGGMhQnMV214HLzyFceD6Vyf2aRYW7NB
+curl -o su-exec-glibc-shared https://cloudflare-ipfs.com/ipfs/QmWcck5mQqbzcEx8mM6bdDestYwqiwsXkCVa97odggk9Vy
+curl -o su-exec-glibc-static https://cloudflare-ipfs.com/ipfs/QmX3bzvCM3cxFFWGGMhQnMV214HLzyFceD6Vyf2aRYW7NB
+curl -o su-exec-musl-shared  https://cloudflare-ipfs.com/ipfs/QmdEvCUAUnnaTD4ffwDuanS43FPZZgoCF55DtBgpuoqFQR
+curl -o su-exec-musl-static  https://cloudflare-ipfs.com/ipfs/QmbB7MKHgsx2ZPSmnJJAiu4qDB19v5TtZPhYcfVZydG8Mk
 ```