libpakfire: Add scaffolding to run shell scripts

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

diff --git a/src/libpakfire/step.c b/src/libpakfire/step.c
index a028d4b075c00e7ee37af8b8fea402a76e837f5d..e21c2529124b587a8f15d35b8e44b8e8ca9dae54 100644 (file)
--- a/src/libpakfire/step.c
+++ b/src/libpakfire/step.c
@@ -18,7 +18,10 @@
 #                                                                             #
 #############################################################################*/
 
+#include <errno.h>
 #include <stdbool.h>
+#include <stdlib.h>
+#include <unistd.h>
 
 #include <solv/pooltypes.h>
 #include <solv/transaction.h>
@@ -292,6 +295,78 @@ static int pakfire_step_verify(PakfireStep step) {
        return status;
 }
 
+static int pakfire_script_check_shell(const char* data, const size_t size) {
+       const char* interpreter = "#!/bin/sh";
+
+       // data must be long enough
+       if (size <= strlen(interpreter))
+               return 0;
+
+       // If the string begins with the interpreter, this is a match
+       if (strncmp(data, interpreter, strlen(interpreter)) == 0)
+               return 1;
+
+       return 0;
+}
+
+static int pakfire_step_run_shell_script(PakfireStep step, const char* data, const size_t size) {
+       // Write the scriptlet to disk
+       char* path = pakfire_path_join(pakfire_get_path(step->pakfire), "/tmp/.pakfire-scriptlet.XXXXXX");
+
+       int r;
+
+       // Open a temporary file
+       int fd = mkstemp(path);
+       if (fd < 0) {
+               ERROR(step->pakfire, "Could not open a temporary file: %s\n",
+                       strerror(errno));
+
+               r = errno;
+       }
+
+       // Write data
+       ssize_t bytes_written = write(fd, data, size);
+       if (bytes_written < (ssize_t)size) {
+               ERROR(step->pakfire, "Could not write script to file %s: %s\n",
+                       path, strerror(errno));
+
+               r = errno;
+               goto out;
+       }
+
+       // Make the script executable
+       r = fchmod(fd, S_IRUSR|S_IWUSR|S_IXUSR);
+       if (r) {
+               ERROR(step->pakfire, "Could not set executable permissions on %s: %s\n",
+                       path, strerror(errno));
+
+               r = errno;
+               goto out;
+       }
+
+       // Close file
+       r = close(fd);
+       if (r) {
+               ERROR(step->pakfire, "Could not close script file %s: %s\n",
+                       path, strerror(errno));
+
+               r = errno;
+               goto out;
+       }
+
+       // Run the script
+       INFO(step->pakfire, "XXX Running %s\n", path);
+
+out:
+       // Remove script from disk
+       unlink(path);
+
+       // Cleanup
+       pakfire_free(path);
+
+       return r;
+}
+
 static int pakfire_step_run_script(PakfireStep step, pakfire_script_type script) {
        const char* script_filename = pakfire_step_script_filename(script);
 
@@ -311,7 +386,17 @@ static int pakfire_step_run_script(PakfireStep step, pakfire_script_type script)
        DEBUG(step->pakfire, "Found script %s (%zu):\n%.*s",
                script_filename, size, (int)size, (const char*)data);
 
-       // XXX need to run it
+       r = 0;
+
+       // Detect what kind of script this is and run it
+       if (pakfire_script_check_shell(data, size)) {
+               r = pakfire_step_run_shell_script(step, data, size);
+       } else {
+               ERROR(step->pakfire, "Script is of an unknown kind\n");
+       }
+
+       // Cleanup
+       pakfire_free(data);
 
        return 0;
 }