fix(tests): replace libexpect with forkpty() for functional tests

Remove dependency on libexpect which had a segfault bug on Arch Linux.

- Replace exp_spawnl() with forkpty() for PTY creation
- Replace exp_expectl() with custom POSIX regex matching
- Update configure.ac to check for forkpty() instead of libexpect
- Update Makefile.am to link with libutil instead of libexpect/libtcl
- Remove expect/tcl packages from all Dockerfiles
- Add Valgrind suppressions for stabber/pthread false positives

tests/functionaltests/proftest.c

@@ -8,9 +8,12 @@
 #include <unistd.h>
 #include <errno.h>
 #include <string.h>
+#include <pty.h>
+#include <fcntl.h>
+#include <sys/select.h>
+#include <regex.h>
 
 #include <stabber.h>
-#include <expect.h>
 
 #include "proftest.h"
 
@@ -19,6 +22,15 @@ char *data_orig;
 
 int fd = 0;
 int stub_port = 5230;
+pid_t child_pid = 0;
+
+/* Buffer for accumulating output from profanity */
+#define OUTPUT_BUF_SIZE 65536
+static char output_buffer[OUTPUT_BUF_SIZE];
+static size_t output_len = 0;
+
+/* Timeout for expect operations in seconds */
+static int expect_timeout = 30;
 
 gboolean
 _create_dir(const char *name)
@@ -119,24 +131,83 @@ _cleanup_dirs(void)
     }
 }
 
+/*
+ * Read available data from fd into output_buffer with timeout.
+ * Returns number of bytes read, 0 on timeout, -1 on error.
+ */
+static int
+_read_output(int timeout_ms)
+{
+    fd_set readfds;
+    struct timeval tv;
+    
+    FD_ZERO(&readfds);
+    FD_SET(fd, &readfds);
+    
+    tv.tv_sec = timeout_ms / 1000;
+    tv.tv_usec = (timeout_ms % 1000) * 1000;
+    
+    int ret = select(fd + 1, &readfds, NULL, NULL, &tv);
+    if (ret <= 0) {
+        return ret;
+    }
+    
+    size_t space = OUTPUT_BUF_SIZE - output_len - 1;
+    if (space <= 0) {
+        /* Buffer full, shift content */
+        memmove(output_buffer, output_buffer + OUTPUT_BUF_SIZE/2, OUTPUT_BUF_SIZE/2);
+        output_len = OUTPUT_BUF_SIZE/2;
+        space = OUTPUT_BUF_SIZE - output_len - 1;
+    }
+    
+    ssize_t n = read(fd, output_buffer + output_len, space);
+    if (n > 0) {
+        output_len += n;
+        output_buffer[output_len] = '\0';
+    }
+    return n;
+}
+
+/*
+ * Custom implementation of exp_spawnl using forkpty.
+ * This avoids the segfault bug in libexpect on Arch Linux.
+ */
 void
 prof_start(void)
 {
-    // Set timeout for expect operations (default is too short for CI)
-    exp_timeout = 30;
-
-    // helper script sets terminal columns, avoids assertions failing
-    // based on the test runner terminal size
-    fd = exp_spawnl("sh",
-        "sh",
-        "-c",
-        "./tests/functionaltests/start_profanity.sh",
-        NULL);
-    FILE *fp = fdopen(fd, "r+");
-
-    assert_true(fp != NULL);
-
-    setbuf(fp, (char *)0);
+    struct winsize ws;
+    ws.ws_row = 24;
+    ws.ws_col = 300;  /* Match COLUMNS=300 from start_profanity.sh */
+    ws.ws_xpixel = 0;
+    ws.ws_ypixel = 0;
+    
+    /* Reset output buffer */
+    output_len = 0;
+    output_buffer[0] = '\0';
+    
+    child_pid = forkpty(&fd, NULL, NULL, &ws);
+    
+    if (child_pid < 0) {
+        fd = -1;
+        return;
+    }
+    
+    if (child_pid == 0) {
+        /* Child process */
+        setenv("COLUMNS", "300", 1);
+        setenv("TERM", "xterm", 1);
+        
+        execl("./profanity", "./profanity", "-l", "DEBUG", NULL);
+        
+        /* If exec fails */
+        fprintf(stderr, "execl failed: %s\n", strerror(errno));
+        _exit(127);
+    }
+    
+    /* Parent process */
+    /* Set non-blocking mode for reading */
+    int flags = fcntl(fd, F_GETFL, 0);
+    fcntl(fd, F_SETFL, flags | O_NONBLOCK);
 }
 
 int
@@ -144,7 +215,8 @@ init_prof_test(void **state)
 {
     gboolean started = FALSE;
     for (int p = 5230; p < 5250; ++p) {
-        if (stbbr_start(STBBR_LOGDEBUG, p, 0) == 0) {
+        int ret = stbbr_start(STBBR_LOGDEBUG, p, 0);
+        if (ret == 0) {
             stub_port = p;
             started = TRUE;
             break;
@@ -172,7 +244,8 @@ init_prof_test(void **state)
     _create_logs_dir();
 
     prof_start();
-    assert_true(prof_output_regex("CProof\\. Type /help for help information\\."));
+    int prof_started = prof_output_regex("CProof\\. Type /help for help information\\.");
+    assert_true(prof_started);
 
     // set UI options to make expect assertions faster and more reliable
     prof_input("/inpblock timeout 5");
@@ -208,11 +281,14 @@ init_prof_test(void **state)
 int
 close_prof_test(void **state)
 {
-    if (fd > 0) {
+    if (fd > 0 && child_pid > 0) {
         prof_input("/quit");
         // Give profanity time to process quit command
         sleep(1);
-        waitpid(exp_pid, NULL, 0);
+        waitpid(child_pid, NULL, 0);
+        close(fd);
+        fd = 0;
+        child_pid = 0;
     }
     _cleanup_dirs();
 
@@ -237,18 +313,72 @@ prof_input(const char *input)
     ssize_t _wn = write(fd, inp_str->str, inp_str->len);
     (void)_wn;
     g_string_free(inp_str, TRUE);
+    
+    /* Small delay to let profanity process input */
+    usleep(10000);
 }
 
+/*
+ * Wait for exact text to appear in output.
+ * Returns 1 if found, 0 if timeout.
+ */
 int
 prof_output_exact(const char *text)
 {
-    return (1 == exp_expectl(fd, exp_exact, text, 1, exp_end));
+    time_t start = time(NULL);
+    
+    while (time(NULL) - start < expect_timeout) {
+        /* Read any available output */
+        while (_read_output(100) > 0) {
+            /* Keep reading while data available */
+        }
+        
+        /* Check if text is in buffer */
+        if (strstr(output_buffer, text) != NULL) {
+            return 1;
+        }
+        
+        usleep(50000);  /* 50ms */
+    }
+    
+    return 0;
 }
 
+/*
+ * Wait for regex pattern to match in output.
+ * Returns 1 if found, 0 if timeout.
+ */
 int
-prof_output_regex(const char *text)
+prof_output_regex(const char *pattern)
 {
-    return (1 == exp_expectl(fd, exp_regexp, text, 1, exp_end));
+    regex_t regex;
+    int ret;
+    
+    ret = regcomp(&regex, pattern, REG_EXTENDED | REG_NOSUB);
+    if (ret != 0) {
+        return 0;
+    }
+    
+    time_t start = time(NULL);
+    
+    while (time(NULL) - start < expect_timeout) {
+        /* Read any available output */
+        while (_read_output(100) > 0) {
+            /* Keep reading while data available */
+        }
+        
+        /* Check if pattern matches */
+        ret = regexec(&regex, output_buffer, 0, NULL, 0);
+        if (ret == 0) {
+            regfree(&regex);
+            return 1;
+        }
+        
+        usleep(50000);  /* 50ms */
+    }
+    
+    regfree(&regex);
+    return 0;
 }
 
 void
@@ -276,12 +406,12 @@ prof_connect_with_roster(const char *roster)
     assert_true(prof_output_regex("password:"));
     prof_input("password");
 
-    exp_timeout = 60;
+    expect_timeout = 60;
     assert_true(prof_output_regex("Connecting as stabber@localhost"));
     assert_true(prof_output_regex("logged in successfully"));
     assert_true(prof_output_regex(".+online.+ \\(priority 0\\)\\."));
     
-    exp_timeout = 60;
+    expect_timeout = 60;
     // Wait for presence stanza to be sent (content-based, not ID-based)
     // Match the actual attribute order from stanza_attach_caps
     assert_true(stbbr_received(
@@ -294,13 +424,13 @@ prof_connect_with_roster(const char *roster)
 void
 prof_timeout(int timeout)
 {
-    exp_timeout = timeout;
+    expect_timeout = timeout;
 }
 
 void
 prof_timeout_reset(void)
 {
-    exp_timeout = 60;
+    expect_timeout = 60;
 }
 
 void

tests/functionaltests/test_carbons.c

@@ -4,7 +4,6 @@
 #include <string.h>
 
 #include <stabber.h>
-#include <expect.h>
 
 #include "proftest.h"
 

tests/functionaltests/test_chat_session.c

@@ -5,7 +5,6 @@
 #include <string.h>
 
 #include <stabber.h>
-#include <expect.h>
 
 #include "proftest.h"
 

tests/functionaltests/test_connect.c

@@ -2,9 +2,9 @@
 #include "prof_cmocka.h"
 #include <stdlib.h>
 #include <string.h>
+#include <stdio.h>
 
 #include <stabber.h>
-#include <expect.h>
 
 #include "proftest.h"
 

tests/functionaltests/test_disconnect.c

@@ -4,7 +4,6 @@
 #include <string.h>
 
 #include <stabber.h>
-#include <expect.h>
 
 #include "proftest.h"
 

tests/functionaltests/test_message.c

@@ -4,7 +4,6 @@
 #include <string.h>
 
 #include <stabber.h>
-#include <expect.h>
 
 #include "proftest.h"
 

tests/functionaltests/test_muc.c

@@ -5,7 +5,6 @@
 #include <string.h>
 
 #include <stabber.h>
-#include <expect.h>
 
 #include "proftest.h"
 

tests/functionaltests/test_ping.c

@@ -5,7 +5,6 @@
 #include <unistd.h>
 
 #include <stabber.h>
-#include <expect.h>
 
 #include "proftest.h"
 

tests/functionaltests/test_presence.c

@@ -4,7 +4,6 @@
 #include <string.h>
 
 #include <stabber.h>
-#include <expect.h>
 
 #include "proftest.h"
 

tests/functionaltests/test_receipts.c

@@ -4,7 +4,6 @@
 #include <string.h>
 
 #include <stabber.h>
-#include <expect.h>
 
 #include "proftest.h"
 

tests/functionaltests/test_rooms.c

@@ -4,7 +4,6 @@
 #include <string.h>
 
 #include <stabber.h>
-#include <expect.h>
 
 #include "proftest.h"
 

tests/functionaltests/test_roster.c

@@ -4,7 +4,6 @@
 #include <string.h>
 
 #include <stabber.h>
-#include <expect.h>
 
 #include "proftest.h"
 

tests/functionaltests/test_software.c

@@ -4,7 +4,6 @@
 #include <string.h>
 
 #include <stabber.h>
-#include <expect.h>
 
 #include "proftest.h"