$ grep rt_sigreturn results/nginx.seccomp.json 
<EMPTY>

<SKIP>
Traversing libc call graph to identify required system calls
allSyscallsOriginal: {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 28, 29, 30, 32, 33, 35, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 53, 54, 55, 56, 59, 60, 61, 62, 63, 67, 72, 74, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 99, 100, 102, 104, 105, 106, 107, 108, 109, 110, 111, 112, 115, 116, 128, 130, 131, 133, 137, 138, 140, 141, 142, 143, 144, 145, 146, 147, 149, 157, 158, 160, 161, 165, 186, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, 201, 202, 203, 204, 213, 218, 221, 228, 229, 231, 232, 233, 234, 235, 257, 262, 263, 267, 269, 273, 275, 277, 280, 288, 290, 293, 296}
<SKIP>

    "postgres": {
        "enable": "true",
        "image-name": "postgres",
        "image-url": "postgres",
        "category": [
            "Databases"
        ],
        "pull-count": 1110065133,
        "official": true,
        "options": "-e POSTGRES_PASSWORD=password",
        "args": "",
        "dependencies": {},
        "id": "14"
    }

Running container postgres, cmd=['docker', 'run', '-l', 'CONFINE', '--security-opt', 'seccomp=unconfined', '--name', 'postgres-container-CONFINE', '-e POSTGRES_PASSWORD=password', '-td', 'postgres']
Docker run success, output: 87d255ca5740489b12bfa403b9d20795495bff143f8c22c7ff2e65bd067c429d

Ran container sleeping for 60 seconds to generate logs and extract execve system calls
originalLog: Error: Database is uninitialized and superuser password is not specified.
       You must specify POSTGRES_PASSWORD to a non-empty value for the
       superuser. For example, "-e POSTGRES_PASSWORD=password" on "docker run".

       You may also use "POSTGRES_HOST_AUTH_METHOD=trust" to allow all
       connections without a password. This is *not* recommended.

    def runWithoutSeccomp(self):
        # The command list cannot contain empty strings
        cmd = list(filter(None,
                ["docker", self.remote, "run", "-l", C.TOOLNAME, "--security-opt", 
                 "seccomp=unconfined", "--name", self.containerName, self.options,
                 "-td", self.imageName, self.args]))
----> ADD FIX HERE?
        self.logger.debug("Running container %s, cmd=%s", self.imageName, cmd)
        proc = subprocess.Popen(cmd, shell=False, stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True)

$ sudo python confine.py -l libc-callgraphs/glibc.callgraph -m libc-callgraphs/musllibc.callgraph -i myimage.json -o output -p default.seccomp.json -r result -g go.syscalls
------------------------------------------------------------------------
////////////////////////////////////////////////////////////////////////
----->Starting analysis for image: nginx<-----
////////////////////////////////////////////////////////////////////////

Traceback (most recent call last):
  File "confine.py", line 266, in <module>
    returncode = newProfile.createSeccompProfile(options.outputfolder + "/" + imageName + "/", options.reportfolder)
  File "/home/fanrong/Computer/sandbox/confine/containerProfiler.py", line 286, in createSeccompProfile
    myFile = open(tempOutputFolder + "/" + C.CACHE, 'r')
IOError: [Errno 2] No such file or directory: u'output/nginx//.cache'

{
    "nginx": {
        "enable": "true",
        "image-name": "nginx",
        "image-url": "nginx",
        "dependencies": {}
    }   
}