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From 014a78261db67c287d25aafa33266593d816315a Mon Sep 17 00:00:00 2001
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From: Thorsten Behrens <tbehrens@suse.com>
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Date: Thu, 11 Dec 2014 15:46:08 +0100
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Subject: [PATCH] Align dev_unit_name() with systemd's function.
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Add more corner cases from systemd's
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unit_name_from_path_instance() C function.
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Signed-off-by: Thorsten Behrens <tbehrens@suse.com>
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Signed-off-by: Thomas Renninger <trenn@suse.de>
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Cherry-picked from: e3eec4b8
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Resolves: #1306640
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---
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 modules.d/99base/dracut-lib.sh | 24 ++++++++++++++++++------
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 1 file changed, 18 insertions(+), 6 deletions(-)
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diff --git a/modules.d/99base/dracut-lib.sh b/modules.d/99base/dracut-lib.sh
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index e04a9b3d..46cee5a9 100755
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--- a/modules.d/99base/dracut-lib.sh
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+++ b/modules.d/99base/dracut-lib.sh
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@@ -868,18 +868,30 @@ wait_for_mount()
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     } >> "$hookdir/emergency/90-${_name}.sh"
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 }
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+# get a systemd-compatible unit name from a path
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+# (mimicks unit_name_from_path_instance())
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 dev_unit_name()
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 {
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+    local dev="$1"
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+
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     if command -v systemd-escape >/dev/null; then
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-        systemd-escape -p  "$1"
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+        systemd-escape -p  "$dev"
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         return
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     fi
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-    _name="${1%%/}"
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-    _name="${_name##/}"
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-    _name="$(str_replace "$_name" '-' '\x2d')"
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-    _name="$(str_replace "$_name" '/' '-')"
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-    echo "$_name"
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+    if [ "$dev" = "/" -o -z "$dev" ]; then
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+        printf -- "-"
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+        exit 0
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+    fi
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+
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+    dev="${1%%/}"
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+    dev="${dev##/}"
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+    dev="$(str_replace "$dev" '\' '\x5c')"
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+    dev="$(str_replace "$dev" '-' '\x2d')"
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+    dev=${dev/#\./\\x2e}
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+    dev="$(str_replace "$dev" '/' '-')"
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+
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+    printf -- "%s" "$dev"
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 }
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 # wait_for_dev <dev>