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Write template result to temporary file and move

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This prevents problems with programs which watch the file for changes and will
first be presented an empty file.
One such example which will show a notification message about an empty config
file is Alacritty.
By writing to a tempory file and then moving it (atomically?) to the real
location this problem is mitigated.
This commit is contained in:
jonasc 2019-02-09 15:38:14 +01:00 committed by Tim Byrne
parent 09a018ea5a
commit a1845c6e8a
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1 changed files with 3 additions and 1 deletions
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yadm
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@ -208,6 +208,7 @@ function alt() {
#; loop over all "tracked" files
#; for every file which is a *##yadm.j2 create a real file
local temp="$(mktemp)"
local IFS=$'\n'
local match="^(.+)##yadm\\.j2$"
for tracked_file in $("$GIT_PROGRAM" ls-files | sort) "${ENCRYPT_INCLUDE_FILES[@]}"; do
@ -223,7 +224,8 @@ function alt() {
YADM_HOSTNAME="$local_host" \
YADM_USER="$local_user" \
YADM_DISTRO=$(query_distro) \
"$ENVTPL_PROGRAM" < "$tracked_file" > "$real_file"
"$ENVTPL_PROGRAM" < "$tracked_file" > "$temp"
mv "$temp" "$real_file"
else
debug "envtpl not available, not creating $real_file from template $tracked_file"
[ -n "$loud" ] && echo "envtpl not available, not creating $real_file from template $tracked_file"