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files: ignore conflict when files are identical

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When the target file exists but has the exact same content then we
will now skip creation of the link from the source file.

Fixes #1213
This commit is contained in:
piegames 2020-05-19 14:44:44 +02:00 committed by Robert Helgesson
parent 7c19bcb822
commit 7f976da068
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GPG key ID: 36BDAA14C2797E89
1 changed files with 17 additions and 3 deletions
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16
modules/files.nix
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@ -106,7 +106,12 @@ in
$VERBOSE_ECHO "Skipping collision check for $targetPath"
elif [[ -e "$targetPath" \
&& ! "$(readlink "$targetPath")" == $homeFilePattern ]] ; then
if [[ ! -L "$targetPath" && -n "$HOME_MANAGER_BACKUP_EXT" ]] ; then
# The target file already exists and it isn't a symlink owned by Home Manager.
if cmp -s $sourcePath $targetPath; then
# First compare the files' content. If they're equal, we're fine.
warnEcho "Existing file '$targetPath' is in the way of '$sourcePath', will be skipped since they are the same"
elif [[ ! -L "$targetPath" && -n "$HOME_MANAGER_BACKUP_EXT" ]] ; then
# Next, try to move the file to a backup location if configured and possible
backup="$targetPath.$HOME_MANAGER_BACKUP_EXT"
if [[ -e "$backup" ]]; then
errorEcho "Existing file '$backup' would be clobbered by backing up '$targetPath'"
@ -115,6 +120,7 @@ in
warnEcho "Existing file '$targetPath' is in the way of '$sourcePath', will be moved to '$backup'"
fi
else
# Fail if nothing else works
errorEcho "Existing file '$targetPath' is in the way of '$sourcePath'"
collision=1
fi
@ -169,11 +175,19 @@ in
relativePath="''${sourcePath#$newGenFiles/}"
targetPath="$HOME/$relativePath"
if [[ -e "$targetPath" && ! -L "$targetPath" && -n "$HOME_MANAGER_BACKUP_EXT" ]] ; then
# The target exists, back it up
backup="$targetPath.$HOME_MANAGER_BACKUP_EXT"
$DRY_RUN_CMD mv $VERBOSE_ARG "$targetPath" "$backup" || errorEcho "Moving '$targetPath' failed!"
fi
if [[ -e "$targetPath" && ! -L "$targetPath" ]] && cmp -s $sourcePath $targetPath ; then
# The target exists but is identical – don't do anything.
$VERBOSE_ECHO "Skipping '$targetPath' as it is identical to '$sourcePath'"
else
# Place that symlink, --force
$DRY_RUN_CMD mkdir -p $VERBOSE_ARG "$(dirname "$targetPath")"
$DRY_RUN_CMD ln -nsf $VERBOSE_ARG "$sourcePath" "$targetPath"
fi
done
'';