Add debug messages to docker functionsdocker-debug

1 files changed, 18 insertions, 4 deletions

diff --git a/src/lib/core/docker.c b/src/lib/core/docker.c
index 484f476..7d4a170 100644
--- a/src/lib/core/docker.c
+++ b/src/lib/core/docker.c
@@ -108,9 +108,13 @@ int docker_save(const char *image, const char *destdir, const char *compression_
 }
 
 static int docker_exists() {
-    if (find_program("docker")) {
+    const char *prog = find_program("docker");
+    if (prog) {
+        SYSDEBUG("Found in PATH: %s", prog);
         return true;
     }
+    const char *pathvar = getenv(PATH_ENV_VAR);
+    SYSDEBUG("Not found in PATH: %s", pathvar ? pathvar : "PATH UNDEFINED");
     return false;
 }
 
@@ -122,6 +126,7 @@ static char *docker_ident() {
 
     tempfile = xmkstemp(&fp, "w+");
     if (!fp || !tempfile) {
+        SYSERROR("unable to open temporary file for writing");
         return NULL;
     }
 
@@ -136,7 +141,7 @@ static char *docker_ident() {
 
     if (!freopen(tempfile, "r", fp)) {
         remove(tempfile);
-        guard_free(tempfile);
+        SYSERROR("unable to open temporary file for reading");
         return NULL;
     }
 
@@ -144,6 +149,7 @@ static char *docker_ident() {
         fclose(fp);
         remove(tempfile);
         guard_free(tempfile);
+        SYSERROR("unable to read version from docker output");
         return NULL;
     }
 
@@ -151,20 +157,27 @@ static char *docker_ident() {
     remove(tempfile);
     guard_free(tempfile);
 
+    SYSDEBUG("detected version: %s", line);
     return strdup(line);
 }
 
 int docker_capable(struct DockerCapabilities *result) {
+    int quiet = LOG_LEVEL < LOG_LEVEL_DEBUG;
     char *version = NULL;
     memset(result, 0, sizeof(*result));
 
+    int flags = 0;
+    if (quiet) {
+        flags |= STASIS_DOCKER_QUIET;
+    }
+
     if (!docker_exists()) {
         // docker isn't available
         return false;
     }
     result->available = true;
 
-    if (docker_exec("ps", STASIS_DOCKER_QUIET)) {
+    if (docker_exec("ps", flags)) {
         // user cannot connect to the socket
         return false;
     }
@@ -175,7 +188,7 @@ int docker_capable(struct DockerCapabilities *result) {
     }
     guard_free(version);
 
-    if (!docker_exec("buildx build --help", STASIS_DOCKER_QUIET)) {
+    if (!docker_exec("buildx build --help", flags)) {
         result->build |= STASIS_DOCKER_BUILD_X;
     }
     if (!docker_exec("build --help", STASIS_DOCKER_QUIET)) {
@@ -212,6 +225,7 @@ int docker_validate_compression_program(char *prog) {
         goto invalid;
     }
     result = find_program(parts[0]) ? 0 : -1;
+    SYSDEBUG("result = %d", result);
 
     invalid:
     guard_array_free(parts);