From 50d77e1989dc35864016cd7aed9eacb7e53fb978 Mon Sep 17 00:00:00 2001
From: Kairui Song <kasong@redhat.com>
Date: Mon, 26 Apr 2021 17:09:57 +0800
Subject: [PATCH] Use a customized emergency shell

Resolves: bz1901024
Upstream: Fedora
Conflict: None

commit 41980f30d9f5806a2e34e30fe279167c12d0ae75
Author: Kairui Song <kasong@redhat.com>
Date:   Mon Apr 26 17:09:57 2021 +0800

    Use a customized emergency shell

    Use a modified and minimized version of emergency shell.
    The differences of this kdump shell and dracut emergency shell are:

      - Kdump shell won't generate a rdsosreport automatically
      - Customized prompts
      - Never ask root password
      - Won't tangle with dracut's emergency_action. If emergency_action is
        set, dracut emergency shell will perform dracut's emergency_action
        instead of kdump final_action on exit.
      - If rd.shell=no is set, kdump shell will still work, dracut emergency
        shell won't, even if kdump failure_action is set to shell.

    Signed-off-by: Kairui Song <kasong@redhat.com>
    Acked-by: Coiby Xu <coxu@redhat.com>

Signed-off-by: Kairui Song <kasong@redhat.com>
---
 kdump-lib-initramfs.sh | 33 +++++++++++++++++++++++++++++----
 1 file changed, 29 insertions(+), 4 deletions(-)

diff --git a/kdump-lib-initramfs.sh b/kdump-lib-initramfs.sh
index e359a15..ca6a825 100755
--- a/kdump-lib-initramfs.sh
+++ b/kdump-lib-initramfs.sh
@@ -237,10 +237,35 @@ dump_to_rootfs()
 
 kdump_emergency_shell()
 {
-    echo "PS1=\"kdump:\\\${PWD}# \"" >/etc/profile
-    ddebug "Switching to dracut emergency..."
-    /bin/dracut-emergency
-    rm -f /etc/profile
+    ddebug "Switching to kdump emergency shell..."
+
+    [ -f /etc/profile ] && . /etc/profile
+    export PS1='kdump:${PWD}# '
+
+    . /lib/dracut-lib.sh
+    if [ -f /dracut-state.sh ]; then
+        . /dracut-state.sh 2>/dev/null
+    fi
+
+    source_conf /etc/conf.d
+
+    type plymouth >/dev/null 2>&1 && plymouth quit
+
+    source_hook "emergency"
+    while read _tty rest; do
+        (
+        echo
+        echo
+        echo 'Entering kdump emergency mode.'
+        echo 'Type "journalctl" to view system logs.'
+        echo 'Type "rdsosreport" to generate a sosreport, you can then'
+        echo 'save it elsewhere and attach it to a bug report.'
+        echo
+        echo
+        ) > /dev/$_tty
+    done < /proc/consoles
+    sh -i -l
+    /bin/rm -f -- /.console_lock
 }
 
 do_failure_action()