From fdc00a2778afab061bf165429c4a3f3497dd091d Mon Sep 17 00:00:00 2001
From: Debarshi Ray <rishi@fedoraproject.org>
Date: Wed, 7 Nov 2018 12:56:10 +0100
Subject: [PATCH] Make shm_open work

Rootless podman shuld mount a tmpfs at /dev/shm by default. Until that
happens, it's worked around by explicitly specifying the mount point.
Also, the --shm-size flag isn't working with rootless podman [1], so
--tmpfs is used instead.

It tries to mimic the in-kernel tmpfs default [2] of using half the
amount of total RAM. If for some reason /proc/meminfo can't be parsed,
it falls back to using podman's default of 65536k for tmpfs. It's not
clear whether podman uses kibibytes or kilobytes for 'k'. The former
was picked here for consistency.

[1] https://github.com/containers/libpod/issues/1770
[2] https://www.kernel.org/doc/Documentation/filesystems/tmpfs.txt

https://github.com/debarshiray/fedora-toolbox/issues/9
---
 fedora-toolbox | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/fedora-toolbox b/fedora-toolbox
index 20d9e8a6d..02ac87cf7 100755
--- a/fedora-toolbox
+++ b/fedora-toolbox
@@ -27,6 +27,7 @@ toolbox_prompt="🔹[\u@\h \W]\\$ "
 
 create()
 (
+    tmpfs_size=$((64 * 1024 * 1024)) # 64 MiB
     working_container_name="fedora-toolbox-working-container-$(uuidgen --time)"
 
     if ! $prefix_sudo buildah inspect --type image $toolbox_image >/dev/null 2>&42; then
@@ -107,9 +108,15 @@ create()
         exit 1
     fi
 
+    total_ram=$(awk '( $1 == "MemTotal:" ) { print $2 }' /proc/meminfo 2>&42) # kibibytes
+    if [ "$total_ram" != "" ] && [ $total_ram -eq $total_ram 2>&42 ]; then
+        tmpfs_size=$((total_ram*1024/2)) # bytes
+    fi
+
     max_uid_count=65536
     max_minus_uid=$((max_uid_count-UID))
     uid_plus_one=$((UID+1))
+
     if ! $prefix_sudo podman create \
                  --group-add wheel \
                  --hostname toolbox \
@@ -118,6 +125,7 @@ create()
                  --network host \
                  --privileged \
                  --security-opt label=disable \
+                 --tmpfs /dev/shm:size=$tmpfs_size \
                  --tty \
                  --uidmap $UID:0:1 \
                  --uidmap 0:1:$UID \