Improve and harden alt file regeneration
Improvements include: 1. Skip writing a temporary file if the file contents are unchanged 2. Better error reporting if templating program fails 3. Better error reporting/handling if file creation, mv, or chmod fail 4. Quiet logs by not outputing "Creating output..." line twice (debug & loud)
This commit is contained in:
Ross Smith II
parent
f163130609
commit
95d7bae7b3
1 changed files with 86 additions and 43 deletions
141
yadm
141
yadm
|
|
@ -363,7 +363,6 @@ function choose_template_cmd() {
|
|||
function template_default() {
|
||||
input="$1"
|
||||
output="$2"
|
||||
temp_file="${output}.$$.$RANDOM"
|
||||
|
||||
# the explicit "space + tab" character class used below is used because not
|
||||
# all versions of awk seem to support the POSIX character classes [[:blank:]]
|
||||
|
|
@ -452,7 +451,10 @@ function conditions() {
|
|||
}
|
||||
EOF
|
||||
|
||||
"${AWK_PROGRAM[0]}" \
|
||||
local source_dir=$(dirname "$input")
|
||||
local yadm_classes out
|
||||
yadm_classes="$(join_string $'\n' "${local_classes[@]}")"
|
||||
out=$("${AWK_PROGRAM[0]}" \
|
||||
-v class="$local_class" \
|
||||
-v arch="$local_arch" \
|
||||
-v os="$local_system" \
|
||||
|
|
@ -461,20 +463,20 @@ EOF
|
|||
-v distro="$local_distro" \
|
||||
-v distro_family="$local_distro_family" \
|
||||
-v source="$input" \
|
||||
-v source_dir="$(dirname "$input")" \
|
||||
-v classes="$(join_string $'\n' "${local_classes[@]}")" \
|
||||
-v source_dir="$source_dir" \
|
||||
-v classes="$yadm_classes" \
|
||||
"$awk_pgm" \
|
||||
"$input" > "$temp_file" || rm -f "$temp_file"
|
||||
"$input")
|
||||
|
||||
move_file "$input" "$output" "$temp_file"
|
||||
move_file "$input" "$output" "$out"
|
||||
}
|
||||
|
||||
function template_j2cli() {
|
||||
input="$1"
|
||||
output="$2"
|
||||
temp_file="${output}.$$.$RANDOM"
|
||||
|
||||
YADM_CLASS="$local_class" \
|
||||
local input="$1"
|
||||
local output="$2"
|
||||
local yadm_classes out
|
||||
yadm_classes="$(join_string $'\n' "${local_classes[@]}")"
|
||||
out=$(YADM_CLASS="$local_class" \
|
||||
YADM_ARCH="$local_arch" \
|
||||
YADM_OS="$local_system" \
|
||||
YADM_HOSTNAME="$local_host" \
|
||||
|
|
@ -482,17 +484,38 @@ function template_j2cli() {
|
|||
YADM_DISTRO="$local_distro" \
|
||||
YADM_DISTRO_FAMILY="$local_distro_family" \
|
||||
YADM_SOURCE="$input" \
|
||||
YADM_CLASSES="$(join_string $'\n' "${local_classes[@]}")" \
|
||||
"$J2CLI_PROGRAM" "$input" -o "$temp_file"
|
||||
YADM_CLASSES="$yadm_classes" \
|
||||
"$J2CLI_PROGRAM" "$input")
|
||||
|
||||
move_file "$input" "$output" "$temp_file"
|
||||
move_file "$input" "$output" "$out" "$?"
|
||||
}
|
||||
|
||||
function template_envtpl() {
|
||||
input="$1"
|
||||
output="$2"
|
||||
temp_file="${output}.$$.$RANDOM"
|
||||
local input="$1"
|
||||
local output="$2"
|
||||
local yadm_classes out
|
||||
yadm_classes="$(join_string $'\n' "${local_classes[@]}")"
|
||||
out=$(YADM_CLASS="$local_class" \
|
||||
YADM_ARCH="$local_arch" \
|
||||
YADM_OS="$local_system" \
|
||||
YADM_HOSTNAME="$local_host" \
|
||||
YADM_USER="$local_user" \
|
||||
YADM_DISTRO="$local_distro" \
|
||||
YADM_DISTRO_FAMILY="$local_distro_family" \
|
||||
YADM_SOURCE="$input" \
|
||||
YADM_CLASSES="$yadm_classes" \
|
||||
"$ENVTPL_PROGRAM" --keep-template "$input")
|
||||
|
||||
move_file "$input" "$output" "$out" "$?"
|
||||
}
|
||||
|
||||
function template_esh() {
|
||||
local input="$1"
|
||||
local output="$2"
|
||||
|
||||
local yadm_classes out
|
||||
yadm_classes="$(join_string $'\n' "${local_classes[@]}")"
|
||||
out=$("$ESH_PROGRAM" "$input" \
|
||||
YADM_CLASS="$local_class" \
|
||||
YADM_ARCH="$local_arch" \
|
||||
YADM_OS="$local_system" \
|
||||
|
|
@ -501,45 +524,60 @@ function template_envtpl() {
|
|||
YADM_DISTRO="$local_distro" \
|
||||
YADM_DISTRO_FAMILY="$local_distro_family" \
|
||||
YADM_SOURCE="$input" \
|
||||
YADM_CLASSES="$(join_string $'\n' "${local_classes[@]}")" \
|
||||
"$ENVTPL_PROGRAM" --keep-template "$input" -o "$temp_file"
|
||||
YADM_CLASSES="$yadm_classes")
|
||||
|
||||
move_file "$input" "$output" "$temp_file"
|
||||
}
|
||||
|
||||
function template_esh() {
|
||||
input="$1"
|
||||
output="$2"
|
||||
temp_file="${output}.$$.$RANDOM"
|
||||
|
||||
YADM_CLASSES="$(join_string $'\n' "${local_classes[@]}")" \
|
||||
"$ESH_PROGRAM" -o "$temp_file" "$input" \
|
||||
YADM_CLASS="$local_class" \
|
||||
YADM_ARCH="$local_arch" \
|
||||
YADM_OS="$local_system" \
|
||||
YADM_HOSTNAME="$local_host" \
|
||||
YADM_USER="$local_user" \
|
||||
YADM_DISTRO="$local_distro" \
|
||||
YADM_DISTRO_FAMILY="$local_distro_family" \
|
||||
YADM_SOURCE="$input"
|
||||
|
||||
move_file "$input" "$output" "$temp_file"
|
||||
move_file "$input" "$output" "$out" "$?"
|
||||
}
|
||||
|
||||
function move_file() {
|
||||
local input=$1
|
||||
local output=$2
|
||||
local temp_file=$3
|
||||
local input="$1"
|
||||
local output="$2"
|
||||
local new="$3"
|
||||
local err="${4:-}"
|
||||
|
||||
[ ! -f "$temp_file" ] && return
|
||||
if [[ -s "$input" && -z "$new" ]]; then
|
||||
debug "Failed to create $output from template $input: error $err"
|
||||
return 1
|
||||
fi
|
||||
|
||||
if [[ -r "$output" ]]; then
|
||||
local old
|
||||
old=$(< "$output")
|
||||
|
||||
if [[ "$old" == "$new" ]]; then
|
||||
debug "Not rewriting file as contents have not changed: $output"
|
||||
return 0
|
||||
fi
|
||||
|
||||
# if the output files already exists as read-only, change it to be writable.
|
||||
# there are some environments in which a read-only file will prevent the move
|
||||
# from being successful.
|
||||
[[ -e "$output" && ! -w "$output" ]] && chmod u+w "$output"
|
||||
|
||||
mv -f "$temp_file" "$output"
|
||||
if [[ ! -w "$output" ]]; then
|
||||
if ! chmod u+w "$output"; then
|
||||
debug "Unable to make '$output' writeable"
|
||||
fi
|
||||
fi
|
||||
fi
|
||||
|
||||
if [ -n "$loud" ]; then
|
||||
echo "Creating $output from template $input"
|
||||
else
|
||||
debug "Creating $output from template $input"
|
||||
fi
|
||||
|
||||
local temp_file="${output}.$$.$RANDOM"
|
||||
if printf '%s' "${new}" >"$temp_file"; then
|
||||
if mv -f "$temp_file" "$output"; then
|
||||
copy_perms "$input" "$output"
|
||||
return
|
||||
fi
|
||||
debug "Failed to rename '$temp_file' to '$output'"
|
||||
rm -f "$temp_file" &>/dev/null
|
||||
else
|
||||
debug "Failed to create '$temp_file' to generate '$output'"
|
||||
fi
|
||||
return 1
|
||||
}
|
||||
|
||||
# ****** yadm Commands ******
|
||||
|
|
@ -707,8 +745,6 @@ function alt_linking() {
|
|||
template_cmd="${alt_template_cmds[$index]}"
|
||||
if [ -n "$template_cmd" ]; then
|
||||
# a template is defined, process the template
|
||||
debug "Creating $tgt from template $src"
|
||||
[ -n "$loud" ] && echo "Creating $tgt from template $src"
|
||||
# ensure the destination path exists
|
||||
assert_parent "$tgt"
|
||||
# remove any existing symlink before processing template
|
||||
|
|
@ -2111,7 +2147,7 @@ function get_mode {
|
|||
|
||||
# only accept results if they are octal
|
||||
if [[ ! $mode =~ ^[0-7]+$ ]] ; then
|
||||
mode=""
|
||||
return
|
||||
fi
|
||||
|
||||
echo "$mode"
|
||||
|
|
@ -2121,7 +2157,14 @@ function copy_perms {
|
|||
local source="$1"
|
||||
local dest="$2"
|
||||
mode=$(get_mode "$source")
|
||||
[ -n "$mode" ] && chmod "$mode" "$dest"
|
||||
if [[ -z "$mode" ]]; then
|
||||
debug "Unable to get mode for '$source'"
|
||||
return 1
|
||||
fi
|
||||
if ! chmod "$mode" "$dest"; then
|
||||
debug "Unable to set mode to '$mode' on '$dest'"
|
||||
return 1
|
||||
fi
|
||||
return 0
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue