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Allow relative paths in run_fastsurfer.sh #732

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ClePol wants to merge 3 commits into from
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Allow relative paths in run_fastsurfer.sh #732

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Allow relative paths in run_fastsurfer.sh
ClePol Sep 29, 2025
ccdb420
simplified for compatibility with older bash versions
ClePol Sep 29, 2025
e816cdd
remove space
m-reuter Sep 30, 2025
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43 changes: 43 additions & 0 deletions run_fastsurfer.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -504,6 +504,49 @@ esac
done
set -- "${POSITIONAL[@]}" # restore positional parameters


# Function to convert path to absolute if it exists and is not empty
convert_to_absolute_path() {
local var_name="$1"
local var_value
eval "var_value=\$$var_name"

if [ -n "$var_value" ]; then
if [ -e "$var_value" ] || [ "${var_value#*/}" != "$var_value" ]; then
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Copilot AI Sep 30, 2025

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[nitpick] The condition [ \"${var_value#*/}\" != \"$var_value\" ] is a complex way to check if a path contains directory separators. Consider using a more readable approach like [[ \"$var_value\" == */* ]] for better maintainability.

Suggested change
if [ -e "$var_value" ] || [ "${var_value#*/}" != "$var_value" ]; then
if [ -e "$var_value" ] || [[ "$var_value" == */* ]]; then

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# Path exists or contains directory separators - convert to absolute
local abs_path
abs_path=$(realpath "$var_value" 2>/dev/null)
if [ $? -eq 0 ] && [ -n "$abs_path" ]; then
eval "$var_name=\"$abs_path\""
else
echo "WARNING: Failed to convert $var_name to absolute path: $var_value" | tee -a "${tmpLF:-/dev/null}"
fi
fi
fi
}

# Convert path variables to absolute paths
convert_to_absolute_path "sd"
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@dkuegler dkuegler Oct 1, 2025

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I would prefer the way this works to be like this

Suggested change
convert_to_absolute_path "sd"
sd="$(convert_to_absolute_path "$sd")"

The other version may work, but function that affect variables as a side effect are really ugly and should always be avoided.

convert_to_absolute_path "t1"
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@dkuegler dkuegler Oct 1, 2025

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Technically, --t1 and --t2 are documented as follows:

  --t1  <T1_input>        T1 full head input (not bias corrected). Requires an
                            ABSOLUTE Path!
  --t2 <T2_input>         *Optional* T2 full head input (does not have to be bias
                            corrected, a mandatory biasfield correction step is
                            performed). Requires an ABSOLUTE Path!

Also forcing t1 to be an absolute path will probably break longitudinal segmentation, see

  if [[ -n "$t1" ]] && [[ "$t1" != "from-base" ]]; then
    echo "WARNING: --t1 was passed but will be overwritten with T1 from base template." | tee -a "$tmpLF"
  fi

Also, the t1 input check checks if the t1 file exists.

if [[ "$run_seg_pipeline" == "1" ]] && { [[ -z "$t1" ]] || [[ ! -f "$t1" ]]; }
then
  echo "ERROR: T1 image ($t1) could not be found. You must supply an existing T1 input"
  echo "  (full head) via --t1 <absolute path and name> for generating the segmentation."
  echo "NOTE: If running in a container, make sure symlinks are valid!"
  exit 1
fi

But this can probably be fixed by moving the conversion block to "after" the input checking and sanitization (search for comment #### START ####)

convert_to_absolute_path "t2"
convert_to_absolute_path "seg_log"
convert_to_absolute_path "conformed_name"
convert_to_absolute_path "norm_name"
convert_to_absolute_path "norm_name_t2"
convert_to_absolute_path "asegdkt_segfile"
convert_to_absolute_path "mask_name"
convert_to_absolute_path "merged_segfile"
convert_to_absolute_path "cereb_segfile"
convert_to_absolute_path "cereb_statsfile"
convert_to_absolute_path "hypo_segfile"
convert_to_absolute_path "hypo_statsfile"
convert_to_absolute_path "asegdkt_vinn_statsfile"
convert_to_absolute_path "aseg_vinn_statsfile"
convert_to_absolute_path "aseg_segfile"
Comment on lines +532 to +545
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@dkuegler dkuegler Oct 1, 2025

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All these should not be made absolute

Suggested change
convert_to_absolute_path "seg_log"
convert_to_absolute_path "conformed_name"
convert_to_absolute_path "norm_name"
convert_to_absolute_path "norm_name_t2"
convert_to_absolute_path "asegdkt_segfile"
convert_to_absolute_path "mask_name"
convert_to_absolute_path "merged_segfile"
convert_to_absolute_path "cereb_segfile"
convert_to_absolute_path "cereb_statsfile"
convert_to_absolute_path "hypo_segfile"
convert_to_absolute_path "hypo_statsfile"
convert_to_absolute_path "asegdkt_vinn_statsfile"
convert_to_absolute_path "aseg_vinn_statsfile"
convert_to_absolute_path "aseg_segfile"

convert_to_absolute_path "FS_LICENSE"



# make sure FastSurfer is in the PYTHONPATH
export PYTHONPATH
PYTHONPATH="$FASTSURFER_HOME$([[ -n "$PYTHONPATH" ]] && echo ":$PYTHONPATH")"
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