docs/CODING_STYLE.md

@@ -1033,38 +1033,3 @@ SPDX-License-Identifier: LGPL-2.1-or-later
 - Never use `grep -q` in a pipeline, use `grep >/dev/null` instead. The former
   will generate `SIGPIPE` for the previous command in the pipeline when it finds
   a match which will cause the test to fail unexpectedly.
-
-## Kernel Version Dependencies
-
-- For entirely new functionality it's fine to rely on features of very recent
-  (released!) kernel versions. If a feature is added to the upstream kernel,
-  and a stable release is made, then it's immediately OK to merge *new*
-  functionality into systemd relying on it, as long as that functionality is
-  optional. (In some cases, it might be OK to merge a feature into systemd
-  slightly before the final kernel release that it is based on, as long as the
-  kernel development cycle has already progressed far enough that the feature
-  is unlikely to be still reverted – for example once RC2 of the kernel release
-  has been released.)
-
-- For components that already have been released in a stable version
-  compatibility with older kernels must be retained, down to the "minimum
-  baseline" version as listed in the README, or the version current when the
-  component was added to our tree, whichever is newer.
-
-- When adding a fallback path, please avoid checking for kernel versions, as
-  downstream distributions tend to backport features, and version checks are
-  not great replacements for feature checks hence.
-
-- When adding a compatibility code path for an older kernel version, please add
-  a comment in the following style to the relevant codepath:
-
-```c
-        // FIXME: This compatibility code path shall be removed once kernel X.Y
-        //        becomes the new minimal baseline
-```
-
-  When this syntax is followed we'll have an easier time tracking down these
-  codepaths and removing them when bumping baselines.
-
-- Whenever support for a new kernel API feature is added, please update the
-  kernel feature/version list in README as well (as part of the same PR).

src/login/inhibit.c

@@ -153,6 +153,8 @@ static int print_inhibitors(sd_bus *bus) {
                 if (r < 0)
                         return table_log_sort_error(r);
 
+                table_set_header(table, arg_legend);
+
                 r = table_print_with_pager(table, arg_json_format_flags, arg_pager_flags, arg_legend);
                 if (r < 0)
                         return r;

test/units/TEST-13-NSPAWN.machined.sh

@@ -190,7 +190,7 @@ test ! -d /var/lib/machines/.hidden1
 
 # Prepare a simple raw container
 mkdir -p /tmp/mnt
-truncate -s 384M /var/tmp/container.raw
+dd if=/dev/zero of=/var/tmp/container.raw bs=1M count=256
 mkfs.ext4 /var/tmp/container.raw
 mount -o loop /var/tmp/container.raw /tmp/mnt
 cp -r /var/lib/machines/container1/* /tmp/mnt

test/units/TEST-13-NSPAWN.nspawn.sh

@@ -77,7 +77,7 @@ testcase_sanity() {
     create_dummy_container "$template"
     # Create a simple image from the just created container template
     image="$(mktemp /var/lib/machines/TEST-13-NSPAWN.image-XXX.img)"
-    truncate -s 384M "$image"
+    dd if=/dev/zero of="$image" bs=1M count=256
     mkfs.ext4 "$image"
     mkdir -p /mnt
     mount -o loop "$image" /mnt
@@ -810,7 +810,7 @@ testcase_rootidmap() {
     root="$(mktemp -d /var/lib/machines/TEST-13-NSPAWN.rootidmap-path.XXX)"
     # Create ext4 image, as ext4 supports idmapped-mounts.
     mkdir -p /tmp/rootidmap/bind
-    truncate -s $((4096*2048)) /tmp/rootidmap/ext4.img
+    dd if=/dev/zero of=/tmp/rootidmap/ext4.img bs=4k count=2048
     mkfs.ext4 /tmp/rootidmap/ext4.img
     mount /tmp/rootidmap/ext4.img /tmp/rootidmap/bind
     trap "rootidmap_cleanup /tmp/rootidmap/" RETURN
@@ -854,7 +854,7 @@ testcase_owneridmap() {
     root="$(mktemp -d /var/lib/machines/TEST-13-NSPAWN.owneridmap-path.XXX)"
     # Create ext4 image, as ext4 supports idmapped-mounts.
     mkdir -p /tmp/owneridmap/bind
-    truncate -s $((4096*2048)) /tmp/owneridmap/ext4.img
+    dd if=/dev/zero of=/tmp/owneridmap/ext4.img bs=4k count=2048
     mkfs.ext4 /tmp/owneridmap/ext4.img
     mount /tmp/owneridmap/ext4.img /tmp/owneridmap/bind
     trap "owneridmap_cleanup /tmp/owneridmap/" RETURN

test/units/TEST-17-UDEV.sanity-check.sh

@@ -25,7 +25,7 @@ netdev=hoge
 ip link add $netdev type dummy
 
 blk="$(mktemp)"
-truncate -s 1M "$blk"
+dd if=/dev/zero of="$blk" bs=1M count=1
 loopdev="$(losetup --show -f "$blk")"
 
 # Wait for devices created in the above being processed.

test/units/TEST-50-DISSECT.sh

@@ -153,7 +153,7 @@ root_size="$(du --apparent-size -k "$MINIMAL_IMAGE.raw" | cut -f1)"
 verity_size="$(du --apparent-size -k "$MINIMAL_IMAGE.verity" | cut -f1)"
 signature_size=4
 # 4MB seems to be the minimum size blkid will accept, below that probing fails
-truncate -s $(((8192+root_size*2+verity_size*2+signature_size*2)*512)) "$MINIMAL_IMAGE.gpt"
+dd if=/dev/zero of="$MINIMAL_IMAGE.gpt" bs=512 count=$((8192+root_size*2+verity_size*2+signature_size*2))
 # sfdisk seems unhappy if the size overflows into the next unit, eg: 1580KiB will be interpreted as 1MiB
 # so do some basic rounding up if the minimal image is more than 1 MB
 if [[ "$root_size" -ge 1024 ]]; then

test/units/TEST-55-OOMD.sh

@@ -26,7 +26,7 @@ if systemd-detect-virt --vm --quiet; then
     if [[ "$(findmnt -n -o FSTYPE /)" == btrfs ]]; then
         btrfs filesystem mkswapfile -s 64M /swapfile
     else
-        fallocate -l 64M /swapfile
+        dd if=/dev/zero of=/swapfile bs=1M count=64
         chmod 0600 /swapfile
         mkswap /swapfile
     fi

test/units/TEST-58-REPART.sh

@@ -1708,7 +1708,7 @@ testcase_btrfs_compression() {
     # Must not be in tmpfs due to exclusions. It also must be large and
     # compressible so that the compression check succeeds later.
     src=/etc/test-source-file
-    fallocate -l 1M "$src"
+    dd if=/dev/zero of="$src" bs=1M count=1 2>/dev/null
 
     tee "$defs/btrfs-compressed.conf" <<EOF
 [Partition]

test/units/TEST-64-UDEV-STORAGE.sh

@@ -1013,7 +1013,7 @@ testcase_iscsi_lvm() {
     udevadm wait --settle --timeout=30 "${devices[0]}"
     mount "${devices[0]}" "$mpoint"
     for i in {1..4}; do
-        truncate -s 32M "$mpoint/lun$i.img"
+        dd if=/dev/zero of="$mpoint/lun$i.img" bs=1M count=32
     done
     # Initialize a new iSCSI target <$target_name> consisting of 4 LUNs, each
     # backed by a file

test/units/TEST-67-INTEGRITY.sh

@@ -48,8 +48,8 @@ EOF
 udevadm control --reload
 
 TMP_DIR="$(mktemp -d -t -p / integrity.tmp.XXXXXX)"
-truncate -s 64M "${TMP_DIR}/image"
+dd if=/dev/zero of="${TMP_DIR}/image" bs=1048576 count=64
-truncate -s 64M "${TMP_DIR}/data"
+dd if=/dev/zero of="${TMP_DIR}/data" bs=1048576 count=64
 LOOP="$(losetup --show -f "${TMP_DIR}/image")"
 udevadm wait --timeout=30 --settle "${LOOP}"
 

test/units/TEST-87-AUX-UTILS-VM.mount.sh

@@ -43,7 +43,7 @@ test -e "$WORK_DIR/upper/foo"
 systemd-umount "$WORK_DIR/overlay"
 
 # Set up a simple block device for further tests
-truncate -s 16M "$WORK_DIR/simple.img"
+dd if=/dev/zero of="$WORK_DIR/simple.img" bs=1M count=16
 mkfs.ext4 -L sd-mount-test "$WORK_DIR/simple.img"
 LOOP="$(losetup --show --find "$WORK_DIR/simple.img")"
 udevadm wait --timeout=60 --settle "$LOOP"