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#include "omc.h"
#include "docker.h"
int docker_exec(const char *args, unsigned flags) {
struct Process proc;
char cmd[PATH_MAX];
memset(&proc, 0, sizeof(proc));
memset(cmd, 0, sizeof(cmd));
snprintf(cmd, sizeof(cmd) - 1, "docker %s", args);
if (flags & OMC_DOCKER_QUIET) {
strcpy(proc.f_stdout, "/dev/null");
strcpy(proc.f_stderr, "/dev/null");
} else {
msg(OMC_MSG_L2, "Executing: %s\n", cmd);
}
shell(&proc, cmd);
return proc.returncode;
}
int docker_script(const char *image, char *data, unsigned flags) {
FILE *infile;
FILE *outfile;
char cmd[PATH_MAX];
char buffer[OMC_BUFSIZ];
memset(cmd, 0, sizeof(cmd));
snprintf(cmd, sizeof(cmd) - 1, "docker run --rm -i %s /bin/bash -", image);
outfile = popen(cmd, "w");
if (!outfile) {
// opening command pipe for writing failed
return -1;
}
infile = fmemopen(data, strlen(data), "r");
if (!infile) {
// opening memory file for reading failed
return -1;
}
do {
memset(buffer, 0, sizeof(buffer));
fgets(buffer, sizeof(buffer) - 1, infile);
fputs(buffer, outfile);
} while (!feof(infile));
fclose(infile);
return pclose(outfile);
}
int docker_build(const char *dirpath, const char *args, int engine) {
char cmd[PATH_MAX];
char build[15];
memset(build, 0, sizeof(build));
memset(cmd, 0, sizeof(cmd));
if (engine & OMC_DOCKER_BUILD) {
strcpy(build, "build");
}
if (engine & OMC_DOCKER_BUILD_X) {
strcpy(build, "buildx build");
}
snprintf(cmd, sizeof(cmd) - 1, "%s %s %s", build, args, dirpath);
return docker_exec(cmd, 0);
}
int docker_save(const char *image, const char *destdir, const char *compression_program) {
char cmd[PATH_MAX];
memset(cmd, 0, sizeof(cmd));
if (compression_program && strlen(compression_program)) {
char ext[255];
memset(ext, 0, sizeof(ext));
if (startswith(compression_program, "zstd")) {
strcpy(ext, "zst");
} else if (startswith(compression_program, "xz")) {
strcpy(ext, "xz");
} else if (startswith(compression_program, "gzip")) {
strcpy(ext, "gz");
} else if (startswith(compression_program, "bzip2")) {
strcpy(ext, "bz2");
} else {
strncpy(ext, compression_program, sizeof(ext) - 1);
}
sprintf(cmd, "save \"%s\" | %s > \"%s/%s.tar.%s\"", image, compression_program, destdir, image, ext);
} else {
sprintf(cmd, "save \"%s\" -o \"%s/%s.tar\"", image, destdir, image);
}
return docker_exec(cmd, 0);
}
static int docker_exists() {
if (find_program("docker")) {
return true;
}
return false;
}
char *docker_ident() {
FILE *fp = NULL;
char *tempfile = NULL;
char line[PATH_MAX];
struct Process proc;
tempfile = xmkstemp(&fp, "w");
if (!fp || !tempfile) {
return NULL;
}
memset(&proc, 0, sizeof(proc));
strcpy(proc.f_stdout, tempfile);
strcpy(proc.f_stderr, "/dev/null");
shell(&proc, "docker -v");
if (!freopen(tempfile, "r", fp)) {
return NULL;
}
if (!fgets(line, sizeof(line) - 1, fp)) {
free(tempfile);
return NULL;
}
fclose(fp);
remove(tempfile);
return strdup(line);
}
int docker_capable(struct DockerCapabilities *result) {
char *version = NULL;
memset(result, 0, sizeof(*result));
if (!docker_exists()) {
// docker isn't available
return false;
}
result->available = true;
if (docker_exec("ps", OMC_DOCKER_QUIET)) {
// user cannot connect to the socket
return false;
}
version = docker_ident();
if (version && startswith(version, "podman")) {
result->podman = true;
}
guard_free(version)
if (!docker_exec("buildx build --help", OMC_DOCKER_QUIET)) {
result->build |= OMC_DOCKER_BUILD;
}
if (!docker_exec("build --help", OMC_DOCKER_QUIET)) {
result->build |= OMC_DOCKER_BUILD_X;
}
if (!result->build) {
// can't use docker without a build plugin
return false;
}
result->usable = true;
return true;
}
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